Quick answer

Usually, no. In a Philippine fixed-price or lump-sum construction contract, the contractor generally bears ordinary errors in estimating quantities and later increases in labor or material costs. The contractor cannot simply raise the agreed price because cement, steel, fuel, wages, or other inputs became more expensive.

An enforceable claim above the fixed price may arise when:

The owner authorized a change in the plans, specifications, or scope in writing, and both parties also fixed the additional price in writing;
The contract contains a valid price-escalation, adjustment, provisional-sum, or unit-price mechanism, and its conditions were met;
The agreement was not truly a fixed-price contract, or the price and plans were never definitively agreed upon;
The contractor has a separate claim caused by the owner’s delay, defective owner-supplied materials, suspension, cancellation, or another breach; or
Special rules govern the project, particularly a government procurement contract.

A contractor may always request renegotiation. That does not mean the owner is legally required to agree.

The general rule for fixed-price construction

Article 1724 of the Civil Code of the Philippines governs construction undertaken for a stipulated price based on agreed plans and specifications. It prevents the contractor from withdrawing or demanding a higher price merely because labor or materials have become more expensive.

The Supreme Court has repeatedly required two things before a contractor may recover the cost of work arising from a change in scope:

Written authority from the owner for the change; and
A written agreement between the parties fixing the additional price.

Both requirements matter. A written instruction to perform extra work, without an agreed written price, may be insufficient. A quotation for extra work, without written owner approval, may also be insufficient.

In Steel Corporation of the Philippines v. Mapfre Insular Insurance Corporation, the Supreme Court also explained that a fixed lump-sum contractor assumes the risk of errors in measurement and expected fluctuations in material prices. Work already included in the original drawings and specifications does not become “extra work” simply because it costs more than the contractor estimated.

When the contractor may recover more

1. The owner approved a genuine change order

The clearest basis for additional payment is a written change to the agreed scope. A proper change order should identify:

The original contract and affected work;
The revised plan, specification, quantity, material, or method;
Who requested and authorized the change;
The added or deducted price;
Any extension or reduction of the completion period;
The effect on warranties, permits, and other obligations; and
The signatures or authenticated approvals of authorized representatives.

For example, replacing the originally specified ceramic tiles with a more expensive stone finish may support an additional charge if the owner approved both the substitution and its price in writing. Correcting the contractor’s own underestimation of the specified tiles ordinarily would not.

The approval should come from the owner or someone with actual authority to bind the owner. A signature from an architect, engineer, site inspector, foreman, or project employee is not automatically enough. In Steel Corporation, a progress report signed by a person whom the contractor knew lacked authority did not establish an approved increase.

2. The contract contains an escalation clause

Parties may agree that the price will adjust if specified events occur. A workable escalation clause normally identifies:

The costs or commodities covered;
The reference price or index;
The trigger or minimum percentage change;
The adjustment formula;
The period covered;
The documents required;
The notice deadline; and
Any ceiling on the adjustment.

The clause must be applied as written. A general reference to “market changes” does not necessarily allow the contractor to pass on every increase. In Salvador v. Court of Appeals, the Supreme Court recognized that escalation clauses are valid but held that their contractual conditions control.

If the contract has no escalation clause, ordinary inflation and foreseeable market fluctuations generally remain the contractor’s risk.

3. The agreement was not actually fixed-price

The label on the document is not conclusive. The whole agreement must be examined.

The final amount may still vary where the documents establish:

Unit rates multiplied by actual measured quantities;
Cost-plus compensation;
Allowances or provisional sums;
Reimbursable expenses;
Daywork rates;
An estimate rather than a final quotation; or
A price to be determined after plans or quantities are completed.

Article 1724 assumes both an actual stipulated price and definitively agreed plans and specifications. In CE Construction Corporation v. Araneta Center, Inc., the Supreme Court explained that Article 1724 does not make a disputed or nonexistent price immutable.

Whether a document marked “estimate,” “quotation,” or “proposal” created a fixed price depends on its wording, attachments, acceptance, and the parties’ conduct. It should not be decided from the document’s heading alone.

4. The owner caused delay, stoppage, or additional expense

A claim caused by the owner’s conduct is different from a unilateral increase based on higher material prices.

Under Articles 1721 and 1722 of the Civil Code:

If the contractor needs an act from the owner and the owner delays or fails to perform it, the contractor may be entitled to reasonable compensation; and
If the work cannot be completed because of defective owner-supplied materials or the owner’s orders, without the contractor’s fault, the contractor may claim a proportionate part of the compensation and reimbursement of proper expenses.

Possible examples include late turnover of the site, failure to provide required information, prolonged owner-ordered suspension, or defective materials supplied by the owner. Entitlement and amount still depend on the contract, timely notices, proof of causation, actual cost records, and any savings or concurrent contractor delay.

The contractor should not disguise a delay or damages claim as an unsupported change order. Each claim should identify its legal and contractual basis separately.

5. The owner cancels the project

Article 1725 permits an owner to withdraw from the work even after construction has begun, but requires indemnification for the contractor’s expenses, work, usefulness obtained by the owner, and damages.

This is not an automatic right to collect the full remaining contract price. The amount depends on the work performed, expenses proved, benefits received, contractual termination provisions, and legally recoverable damages.

6. Exceptional hardship or impossibility applies

Article 1267 allows release, in whole or in part, when a service becomes so difficult that it is manifestly beyond what the parties contemplated. This is an exceptional remedy, not a routine price-escalation clause.

The Supreme Court has held that mere inconvenience, unexpected impediments, increased expense, or a bad bargain is insufficient. The change generally must have been unforeseeable, not caused by either party, make future performance extremely difficult but not impossible, and place the obligor at a serious disadvantage. See Naga Telephone Company, Inc. v. Court of Appeals.

Even when Article 1267 is potentially relevant, it speaks of release from the obligation. It does not ordinarily authorize a contractor to choose a new price and impose it on the owner.

Actual legal or physical impossibility, force majeure, and contractual relief provisions require separate analysis. A contractor should not abandon the site based only on its own conclusion that one of these doctrines applies.

What if the extra work was only verbally approved?

The contractor faces substantial risk. Article 1724 expressly requires written authorization and a written agreement on the added price.

Electronic records may qualify as writings when their integrity and authenticity can be established under the Electronic Commerce Act. An email exchange or authenticated electronic document can therefore be important. However, the communication must clearly show:

The exact change being authorized;
The agreed added or revised price;
The identity and authority of the approving person; and
Mutual assent, rather than continuing negotiations.

A vague “go ahead,” a reaction emoji, an unsigned quotation, or a message from an unauthorized site employee may not establish both statutory requirements. A signed change order remains the safer practice.

Does the owner’s acceptance of the work cure missing documents?

Not automatically. Supreme Court decisions applying Article 1724 have treated its written requirements as conditions that must be satisfied before additional costs may be recovered.

There are exceptional cases in which waiver, the actual terms of the parties’ contract, or equitable considerations affected the result. In Metro Bottled Water Corporation v. Andrada Construction, the Court upheld findings that the owner had waived strict enforcement of its contractual change-order procedure under the particular facts.

That decision should not be treated as permission to bypass written change orders. Waiver and unjust enrichment are highly fact-dependent, and the result may turn on repeated approvals, prior dealings, payment history, authorized instructions, contract language, and findings of the construction arbitral tribunal. Merely showing that the owner saw or benefited from the work may not overcome Article 1724.

What an owner should do after receiving an additional demand

Do not alter or destroy the project records. Preserve the contract, accepted proposal, plans, specifications, bill of quantities, addenda, exclusions, schedules, and all revisions.
Ask for an itemized written claim. Require the contractor to identify each allegedly additional item, the instruction authorizing it, the agreed price, the person who approved it, and the contractual or legal basis.
Compare the claim with the original scope. Check whether the item already appears in the drawings, specifications, inclusions, or contractor’s obligations. Use a qualified architect, engineer, or quantity surveyor when the issue is technical.
Separate disputed and undisputed amounts. Withholding all certified progress payments can create a separate owner-default dispute. Pay or address undisputed amounts according to the contract while clearly reserving rights regarding the contested claim.
Respond in writing. State which items are accepted, rejected, or still under review. If no change was authorized, say so promptly. Avoid statements or partial payments that could be interpreted as approval without first understanding their effect.
Control further work. Direct the contractor not to proceed with disputed variations until the required approval is completed, subject to genuine safety measures and the contract’s emergency-work provisions.
Follow the dispute clause. Observe any notice, architect’s-decision, negotiation, mediation, or arbitration steps stated in the contract.

What a contractor should do before performing extra work

Send a written notice describing why the requested work is outside the original scope.
Attach the revised drawing or specification and an itemized quotation.
State the price and schedule effect.
Confirm that the approving person has authority.
Obtain written approval of both the change and price.
Keep proof of labor, materials, equipment, subcontractor costs, and delay.
Issue contractual notices within the required period.
If urgent work is needed to protect persons or property, document the emergency, notify the owner immediately, and follow any emergency-work procedure. Do not assume all emergency costs will automatically be recoverable.

Evidence worth preserving

Both sides should retain original or reliable copies of:

The signed contract and all incorporated documents;
Accepted bids, proposals, clarifications, addenda, and exclusions;
Approved-for-construction plans and revision histories;
Change orders, variation orders, site instructions, and requests for information;
Emails and original exports of relevant text or messaging-app conversations;
Daily reports, manpower and equipment logs, and project schedules;
Dated photographs and videos;
Delivery receipts, invoices, payroll records, and subcontractor billings;
Progress billings, certifications, official receipts, and proof of payment;
Minutes of meetings and attendance records;
Documents showing who had authority to approve changes; and
Notices of delay, suspension, force majeure, or breach and proof of receipt.

Screenshots alone may omit sender information, dates, surrounding messages, or metadata. Preserve the original electronic records when possible.

Common mistakes

Assuming every increase in market prices can be passed to the owner;
Treating work already shown in the original plans as a variation;
Beginning extra work while the price is still “to be discussed”;
Relying on verbal instructions or approval from someone without authority;
Confusing a progress certification with approval of an additional price;
Failing to observe a short contractual notice period;
Withholding every payment because one portion is disputed;
Treating a budget, estimate, allowance, or unit-rate contract as automatically fixed-price;
Assuming owner occupancy or use conclusively proves acceptance of every extra charge; and
Abandoning the project without following contractual suspension or termination procedures.

Government construction contracts follow additional rules

Government projects require separate analysis under the New Government Procurement Act, Republic Act No. 12009, its implementing rules, the bidding documents, and applicable GPPB issuances.

Section 89 treats bid prices for the awarded scope as fixed.

Quick answer

Usually, no. A contractor who agreed to complete construction for a fixed or lump-sum price generally cannot charge more merely because labor, materials, fuel, exchange rates, or other inputs became more expensive.

An additional amount may be legally recoverable when, for example:

The owner authorized a change in the plans or specifications in writing, and both parties agreed in writing on the additional price.
The contract contains a valid price-escalation or adjustment clause, and its stated conditions were met.
The agreement was not truly fixed-price because no definite price, scope, plans, or specifications were finally agreed upon.
The claim is separate compensation for an owner-caused delay, suspension, cancellation, defective owner-supplied materials, or another breach covered by the contract or law.
Special government-procurement rules apply.

A contractor may always propose a renegotiation, but a request for more money is not the same as a legal right to collect it. The contract, approved plans, change-order records, and actual authority of the person who approved the work will usually determine the answer.

The general rule for fixed-price construction

Article 1724 of the Civil Code of the Philippines applies when a contractor undertakes to build a structure or perform work for a stipulated price according to plans and specifications agreed with the owner.

Under that provision, the contractor generally assumes the risk that labor or materials may cost more than expected. The contractor cannot unilaterally withdraw or increase the price simply because:

Cement, steel, lumber, fuel, or imported components became more expensive;
Wages or subcontractor quotations increased;
The contractor underestimated quantities or made an error in costing;
The contractor’s profit became smaller or the project became unprofitable; or
Actual quantities differed from the contractor’s estimate while the agreed scope remained unchanged.

The Supreme Court has explained that, in a fixed lump-sum contract, the contractor normally takes the risk of probable estimating and measurement errors. Work already included in the agreed drawings or specifications does not become “extra work” merely because the contractor overlooked or underpriced it. See Steel Corporation of the Philippines v. Mapfre Insular Insurance Corporation.

When a contractor may charge for changed or additional work

Article 1724 requires two things for additional costs caused by a change in the agreed plans or specifications:

The owner must authorize the change in writing; and
The owner and contractor must determine the additional price in writing.

Both requirements matter. A written site instruction that orders a change but says nothing definite about price may be insufficient. Conversely, a contractor’s quotation does not establish liability if the owner never accepted it in writing.

The safest document is a signed change order stating:

The exact addition, deletion, substitution, or design revision;
The drawings, specifications, or bill-of-quantities items affected;
The increase or decrease in the contract price;
The effect on the completion date;
The basis of valuation, including applicable unit rates;
Whether taxes, permits, testing, and professional fees are included; and
The names and authority of the persons approving the change.

In Salvador v. Court of Appeals, the Supreme Court rejected a claim for additional work where the contractor had neither the required written authority nor a written agreement on the additional price. The contractor had also failed to notify the owners in advance and had no authority to determine changes and prices unilaterally.

Approval must come from an authorized person

A signature from an architect, engineer, foreman, project manager, or site representative does not automatically bind the owner. The contract may give that person authority to inspect or certify progress without giving authority to alter the scope or approve additional cost.

Before relying on an instruction, the contractor should verify:

Who the contract identifies as the owner’s authorized representative;
Whether that person may approve both scope and price;
Whether approval above a certain amount requires another signature, board resolution, or corporate authority; and
Whether the contract requires a specific change-order form.

The Supreme Court has rejected additional-cost claims supported by a progress report signed by someone the contractor knew was not authorized to approve the change or its cost.

Can email or a messaging-app conversation satisfy the writing requirement?

Potentially, but it is risky to rely on informal messages. The Electronic Commerce Act recognizes qualifying electronic documents and electronic signatures, subject to integrity, reliability, attribution, and authentication requirements.

An email or authenticated electronic exchange is much stronger when it clearly identifies:

The proposed change;
The exact additional price or an agreed method for computing it;
Acceptance by both parties;
The sender’s authority; and
Any time extension.

A message such as “Sige, proceed” may not establish agreement on price or prove that the sender had authority. Preserve the original electronic conversation and metadata, not only screenshots. A formally signed change order remains the safer practice.

A price-escalation clause can change the result

Parties may validly include an escalation clause allowing adjustments when specified events occur. Its terms control.

A workable clause should identify:

The materials or cost components covered;
The starting or base price;
The official index, supplier quotation, or formula to be used;
The percentage or peso threshold that triggers an adjustment;
Whether decreases also reduce the price;
Required supporting documents;
Notice and submission deadlines; and
Who must approve the computation.

A general statement that the price is “subject to adjustment” may create an interpretation dispute. A contractor claiming escalation must prove compliance with the clause’s actual conditions. Market increases do not create an escalation right when the contract contains no such clause.

Situations that are different from a simple price increase

The agreement was not actually fixed-price

Article 1724 presupposes an actual stipulated price and definitely agreed plans and specifications. If either is missing, the price may not be immutable under that article.

For example, an agreement described as an “estimate,” “budget,” “cost-plus contract,” “unit-price contract,” or “provisional sum” may permit the final amount to vary. The label is not conclusive: the full proposal, acceptance, plans, inclusions, exclusions, and payment method must be read together.

In CE Construction Corporation v. Araneta Center, Inc., the Supreme Court emphasized that Article 1724 requires both an actual stipulated price and definitely agreed plans and specifications. A disputed or missing price cannot be made fixed merely by invoking the article.

The owner caused delay or prevented completion

A claim caused by the owner’s conduct may be separate from an attempt to increase the fixed price.

Under Articles 1721 and 1722 of the Civil Code:

If an act required from the owner is delayed or not performed, the contractor may be entitled to reasonable compensation, subject to the relevant facts and savings made during the delay.
If the work cannot be completed because of defective owner-supplied materials or the owner’s orders, without the contractor’s fault, the contractor may have a claim for the proportionate value of work performed and reimbursement of proper expenses.

The contract’s notice, extension-of-time, suspension, and claims procedures remain important. A contractor should document the event immediately rather than wait until final billing.

The owner cancels the project

Article 1725 allows an owner to withdraw from the construction even after work begins, but requires indemnification for the contractor’s expenses, work, usefulness obtained by the owner, and damages. This is not an automatic right to collect the entire original price; the recoverable amount depends on the contract, work performed, expenses, mitigation, and proof of loss.

The owner committed a substantial breach

A contractor may have rights arising from nonpayment or another substantial owner breach. Those rights can include contractual suspension, damages, or rescission under the general rules on reciprocal obligations. They do not ordinarily allow the contractor to invent a higher price.

Owners should therefore avoid withholding all progress payments merely because one variation is disputed. Pay or formally address undisputed certified amounts in accordance with the contract.

Performance became extraordinarily difficult

Article 1267 of the Civil Code may release an obligor, wholly or partly, when a future service becomes so difficult that it is manifestly beyond what the parties contemplated. This is a narrow, fact-dependent doctrine.

It does not ordinarily authorize a contractor to set a new price unilaterally. The Supreme Court has held that inconvenience, unexpected impediments, inflation, or increased expense alone does not necessarily excuse a bad bargain. The event must satisfy demanding requirements, including unforeseeability, extreme difficulty, absence of fault by either party, and a future prestation. See Naga Telephone Company, Inc. v. Court of Appeals.

A contractor invoking this doctrine should obtain legal advice before stopping work. Relief normally depends on agreement or a ruling by the proper tribunal, not the contractor’s declaration alone.

The owner accepted or benefited from unauthorized extras

Do not assume that acceptance of completed work automatically cures the lack of written authority and written price required by Article 1724. Several Supreme Court decisions apply the writing requirements strictly.

There are exceptional decisions involving waiver, ambiguous or incomplete contract mechanisms, and equitable compensation for services knowingly accepted. In Metro Bottled Water Corporation v. Andrada Construction & Development Corporation, Inc., the result depended on the parties’ contract, conduct, established waiver, and CIAC’s factual findings.

That decision should not be treated as permission to proceed on verbal instructions. Waiver and unjust-enrichment arguments are highly fact-specific and commonly require arbitration or litigation.

Government construction contracts follow special rules

Government projects are subject to procurement law, the bidding documents, the notice to proceed, applicable contract-implementation rules, and approval by authorized government officials. A field instruction alone cannot bypass those requirements.

Section 89 of the New Government Procurement Act, Republic Act No. 12009, treats bid prices for the awarded scope as fixed. For infrastructure projects, an extraordinary increase in specified components may be considered only through the statutory process and with prior GPPB approval.

Under the current Implementing Rules and Regulations of Republic Act No. 12009:

The increase must exceed 10% of the relevant work-item unit price, measured against applicable Philippine Statistics Authority price indices, before statutory price escalation may be authorized;
Any adjustment is on a no-loss, no-gain basis and is not automatic;
Cumulative positive variation orders ordinarily may not exceed 10% of the original contract price;
In exceptional cases urgently necessary to complete the original scope, the Head of the Procuring Entity may authorize cumulative positive variation orders above 10% but not exceeding 20%, upon the required recommendation; and
Separable works beyond the ordinary limit generally require another procurement project.

Older or transition projects may remain governed by different procurement provisions and their original bid documents. The contractor should not perform a government variation based only on an expectation that funds or approval will later be obtained.

What to do when a contractor demands an additional amount

If you are the owner

Read the entire contract package. Include the accepted proposal, plans, specifications, bill of quantities, addenda, exclusions, general conditions, and correspondence.
Identify the pricing model. Determine whether it is genuinely fixed lump-sum, unit-price, cost-plus, or partly provisional.
Match every claimed extra to the original scope. Work shown in the agreed drawings or specifications may already be included even if it was omitted from the contractor’s estimate.
Ask for an itemized written claim. Require the instruction, changed drawing, quantity, unit rate, receipts or computations, time effect, contractual basis, and approval relied upon.
Check authority. Confirm whether the person who allegedly approved the change could bind you.
Respond promptly in writing. State which items are accepted, rejected, or require clarification. Avoid silence that may later be used as evidence of acquiescence or waiver.
Continue dealing with undisputed obligations. Do not automatically stop all payments or obstruct work because one claim is disputed.
Arrange an independent inspection if necessary. This is especially important before disputed work is concealed, replaced, demolished, or completed by another contractor.

If you are the contractor

Submit a written change proposal before starting extra work.
State both the additional price and requested extension of time.
Obtain approval from the person authorized under the contract.
Follow every notice and claim deadline in the contract.
Keep separate cost records for changed work and delay-related expenses.
If the instruction is urgent or relates to safety, notify the owner immediately, secure the site as necessary, and document why action was required. Do not assume this guarantees payment.
If approval is withheld, formally reserve the claim and use the contract’s dispute procedure rather than silently proceeding.

Evidence to preserve

Keep original or reliably backed-up copies of:

The signed contract and accepted proposal;
All plan and specification versions;
Tender addenda, clarifications, and exclusions;
Change orders and variation quotations;
Emails, letters, and complete messaging-app exports;
Records showing each signatory’s authority;
Site instructions, requests for information, and meeting minutes;
Daily logs, manpower reports, and equipment records;
Dated photographs and videos;
Delivery receipts, invoices, payroll records, and subcontractor bills;
Progress billings, certifications, official receipts, and proof of payment;
Work schedules, delay notices, and extension requests;
Inspection, testing, punch-list, turnover, and acceptance records; and
Any written objection, demand, acknowledgment, or reservation of rights.

Preserve electronic files in their original format when possible. Edited screenshots or forwarded messages may be harder to authenticate.

Common mistakes

Treating every price increase as force majeure;
Calling work “additional” without comparing it with the complete original scope;
Proceeding after a verbal instruction and discussing price only after completion;
Assuming an architect or site engineer can approve additional cost;
Signing a vague change order that does not state the price or valuation method;
Missing a short contractual notice deadline;
Withholding undisputed payments as leverage;
Paying a disputed claim without a written settlement or reservation;
Assuming owner acceptance always overrides Article 1724; and
Waiting until memories fade or records are lost before raising the claim.

Deadlines and dispute forum

Article 1724 does not provide one universal notice period for every variation. The contract may impose much shorter deadlines for notice of changes, delay claims, extensions, escalation, or dispute referral. Those provisions should be checked immediately.

Under Articles 1144 and 1145 of the Civil Code:

An action based on a written contract generally must be brought within 10 years from accrual of the cause of action.
An action based on an oral contract or quasi-contract generally must be commenced within six years.

The correct starting date and legal classification can be disputed. Special laws, arbitration provisions, contractual claim procedures, and particular remedies may affect the deadline. Article 1155 also provides that prescription may be interrupted by filing an action, a written extrajudicial demand by the creditor, or the debtor’s written acknowledgment of the debt.

For Philippine construction disputes, check the arbitration clause. Under Executive Order No. 1008, the Construction Industry Arbitration Commission has original and exclusive jurisdiction over covered construction disputes when the parties agreed to voluntary arbitration. Covered issues can include payment, changes in contract cost, specifications, delays, defects, and breach.

A party invoking CIAC arbitration files a Request for Arbitration with the supporting construction contract, arbitration agreement, facts, issues, requested relief, and relevant documents. Consult the current CIAC Revised Rules of Procedure and CIAC filing guidance before filing.

When legal help is urgent

Seek advice from a Philippine construction lawyer promptly if:

The contractor threatens to abandon the project, remove materials, or lock the owner out;
The owner threatens termination, takeover, bond calls, or blacklisting;
A large variation is being performed without signed approval;
Safety, structural integrity, permits, or occupancy is affected;
Work will soon be concealed or altered, making inspection difficult;
A contractual notice, arbitration, or filing deadline is approaching;
The project involves government funds;
Either party proposes signing a waiver, final release, quitclaim, or settlement; or
The dispute may affect performance bonds, retention money, subcontractors, or multiple project participants.

Frequently asked questions

Can a contractor increase a fixed price because materials became more expensive?

Generally, no. The result may differ if the contract has an enforceable escalation clause or if special government-procurement rules apply.

Can the contractor charge for work the owner verbally requested?

Recovery is uncertain and risky. Article 1724 requires written owner authorization and written agreement on the additional price for changes to agreed plans or specifications.

Is a contractor’s written quotation enough?

Not by itself. There must also be clear written acceptance by the owner or an authorized representative.

Does “fixed price” cover owner-requested design changes?

Not necessarily. A genuine change may justify an adjustment, but the change and additional price should satisfy Article 1724 and the contract’s change-order procedure.

Can the contractor stop work if the owner rejects the increase?

Not merely because ordinary costs increased. Suspension or termination may be available for a substantial owner breach or under an express contract provision, but stopping without a valid basis can itself be a breach.

Can the owner refuse all further payment?

That can be dangerous if certified or undisputed progress payments are due. The owner should separate the disputed variation from amounts properly payable under the original contract.

What if the document says “estimate” rather than “fixed price”?

The complete agreement controls. The word “estimate” may indicate a variable price, but surrounding provisions, the accepted scope, unit rates, payment method, and parties’ conduct must be examined.

This article provides general Philippine legal information, not advice for a particular contract or dispute. Results depend on the complete documents, applicable procurement regime, authority of the participants, and evidence. Primary legal and official procedural sources were checked as of 4 August 2026.