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A construction contract should state what work earns each payment, how the amount is calculated, when it is due and payable, what notices are required, and exactly when any retention is released. This guide focuses on UK construction contracts, with statutory detail particularly relevant to England and Wales; payment rules differ elsewhere, and the signed contract, project type and governing law matter.
What should a construction contract payment schedule include?
A useful payment schedule makes it possible for both parties to identify when payment has been earned and how much is due. It should tie payment to objectively verifiable work or a defined assessment process, then set out the application and notice process and the dates on which payment falls due and must be made.
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For construction contracts within its scope, the Housing Grants, Construction and Regeneration Act 1996 provides for instalment, stage or other periodic payments unless the contract specifies, or the parties agree, that the work duration is under 45 days. The parties can agree the amounts and the intervals or circumstances in which payments become due. The Act requires an adequate mechanism to determine what payments become due and when, as well as a final date for payment. Read the consolidated Act alongside the contract; statutory coverage and provisions should be checked for the particular project and jurisdiction.
Use this checklist when drafting or reviewing a schedule. It is a practical aid, not a statutory form:
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- Work or milestone: Describe the completed work that earns payment in terms that can be verified. Avoid a vague trigger such as “progress satisfactory” unless the contract explains how that is assessed.
- Verification evidence: Say what records or inspection establish completion—for example, an agreed measurement, inspection record or specified deliverable—where evidence is needed.
- Valuation method: Set out a fixed amount, percentage, measured valuation or other calculation, including what the percentage applies to and any stated assumptions.
- Application and assessment dates: Explain when an application may be submitted, what it must contain and how the amount is assessed.
- Payment dates: State when payment becomes due and the final date for payment. Do not leave the parties to infer the interval from an invoice date or an informal understanding.
- Deductions and adjustments: Identify permitted deductions or adjustments and how they are calculated. An unexplained reduction invites a dispute.
- Notices and disputes: Set out who gives payment notices, how amounts are notified, and what notice is required if a party intends to pay less or withhold payment.
The schedule need not use a particular sequence of residential milestones. The law described above does not prescribe a standard list of stages such as foundations, lock-up or practical completion. Choose events that fit the work and can be assessed consistently; a milestone that is hard to verify can make payment timing harder to administer and challenge.
Should payments be tied to milestones or periodic valuations?
Neither structure is automatically best. Milestone payments can be straightforward when discrete deliverables are easy to verify; periodic or interim valuations can suit work that progresses continuously and is measured over time.
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| Question | Milestone payments | Periodic or interim valuation |
|---|---|---|
| How is progress assessed? | Against a defined event or completed piece of work. | By valuing work completed during an agreed period or at an assessment date. |
| How often can applications be made? | When a specified milestone is reached, as the contract provides. | At agreed recurring intervals or assessment dates. |
| What evidence is useful? | Evidence that the defined milestone is complete. | Measurements, progress records or other agreed valuation information. |
| What is the cash-flow trade-off? | Payment may depend on reaching the next trigger; the parties should consider the effect of the interval between triggers. | More regular assessments may spread payments over the work, but require a reliable recurring valuation process. |
These are design considerations, not a statutory ranking. Whatever structure the parties choose, the amount and timing mechanism needs to be clear and workable. A hybrid can also be set out in the contract, provided its triggers, calculations and dates are understandable.
What do payment notices and notices of intention to withhold do?
They formalise what is due and, where necessary, the reason a party says it will pay less. Under the statutory framework, payment notices matter, and payment generally cannot be withheld after the final date for payment unless an effective notice of intention to withhold has been given.
The exact notice requirements—including wording, timing, who must serve a notice and how it must be served—depend on the applicable contract and law. Follow the contract’s notice clause rather than relying on an email, an invoice annotation or a conversation being enough. If the contract has no compliant payment mechanism, statutory provisions may be relevant; the details are not safe to generalise across jurisdictions or project types.
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For England and Wales, the Scheme for Construction Contracts contains default provisions that can apply where relevant contract terms are missing. It is not a universal payment schedule, and readers should not assume its defaults apply in Scotland, Northern Ireland or another country. The 1996 Act also provides statutory adjudication for qualifying construction disputes, but whether a particular dispute or contract falls within that framework should be checked rather than assumed.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsWhat is a construction retention sum?
A retention is money withheld under the contract from an amount otherwise payable, commonly as security or an incentive connected with completion and the correction of defects. It is not the same thing as a separate, automatically applicable statutory percentage: the sources here establish no universal retention rate or standard release timetable.
The contract should specify:
- the retention amount or percentage and the value to which it applies;
- whether it is deducted from each interim payment or calculated another way;
- each event that permits release, such as a stated completion milestone or the end of an agreed defects process;
- the date or deadline for release after each event;
- how outstanding snagging, identified defects, disputes or incomplete work affect release; and
- how the amount retained for a particular defect is identified and dealt with.
Do not assume that calling a sum “retention” explains its terms. The contract should make clear when a party becomes entitled to it and what process applies if a defect is reported or disputed. If a specific sum is held back because of a specific defect, the basis and amount should be traceable to the contract and applicable law rather than left as an unexplained blanket deduction.
There is also an important UK subcontract issue. The government-commissioned retentions report describes statutory changes for relevant construction contracts entered into after 1 October 2011: release of retention in a subcontract cannot simply be made conditional on an event under a separate main contract. The release trigger must be an act or event under that subcontract. This is a specific legal context, not a substitute for checking the current law and the wording of the subcontract.
When should a construction retention be released?
The answer should be in the contract, not inferred from a general industry rule. A well-drafted clause names each release trigger and gives a clear release date or period after it occurs, while explaining how any remaining defects or disputes affect the amount.
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For example, the parties may define separate release events and specify what evidence confirms each one. The contract should also say what happens if work is substantially complete but minor defects remain: whether a defined amount can be held for those items, how those items are assessed, and when that balance is released once they are corrected or otherwise resolved. The precise arrangement is a matter for the contract and applicable law; there is no universal timetable established here.
UK government construction guidance discussed release of retention in certain circumstances when work was substantially complete and only minor defects remained, with an appropriate amount withheld for those defects. It also discussed releasing percentages at milestones. That advice appeared in COVID-era guidance, so it should not be treated as a current universal rule or as a term automatically written into every contract. The same guidance discussed project bank accounts as a possible way to accelerate supply-chain payments; that is a separate payment mechanism, not a rule for releasing retention. See PPN 02/20 for its context.
What does a construction warranty cover?
“Warranty” can refer to different promises and instruments, so check who owes what remedy and to whom. At least three arrangements may be relevant:
- The contractor’s contractual promise: A contract may require the contractor to correct defects in defined work, within a stated period and subject to the contract’s process.
- A manufacturer or supplier product warranty: This concerns specified products or components and depends on the terms of the product warranty, including who can claim and what it excludes.
- An insurance-backed guarantee or other third-party warranty: This may provide a route to a remedy beyond the original contractor, but its protection depends on the actual instrument and the circumstances it covers.
Read the relevant terms for the covered work or products, exclusions, duration and start date, claim procedure, eligible claimant, and what happens if the contractor or subcontractor becomes insolvent. Do not assume that a warranty covers every defect, loss or later-discovered problem, or that a document’s title tells you the breadth of its protection.
A North Devon Council standard building contract provides one example: it says defects appearing within twelve months of completion are to be made good by the contractor at no cost to the employer. That is a clause in that council’s form, not a general statutory warranty period or a rule for all construction contracts. The sample contract illustrates why the actual wording matters.
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A stated defects or warranty period should not automatically be read as the limit of every legal right a party may have. The contract’s remedy period, any product or third-party warranty and other legal rights are different questions; their interaction depends on the facts, contract and governing law. For consumer home-improvement contracts in particular, older Office of Fair Trading guidance cautioned against terms that cut off responsibility merely because a consumer did not complain immediately or within an unduly short period. That guidance is old and should not be relied on as a statement of current law without checking it; see the OFT guidance in its historical context.
Is a warranty or guarantee better than retention?
Not in every case. Retention withholds the contractor’s cash under the contract; a warranty or guarantee may offer assurance without withholding that cash, but the protection depends on its terms and may cost more to arrange.
| Consideration | Retention | Warranty or guarantee |
|---|---|---|
| Cash flow | Some payment is withheld until the contractual release trigger. | May avoid withholding the contractor’s cash, although arranging the instrument can involve cost. |
| Who provides the remedy? | The contract determines who holds the money and how it may be released; the retention itself is not a repair promise. | The contractor, insurer or other provider may owe the remedy, depending on the instrument. |
| Coverage and duration | Depends on the retention clause and the defects or completion events it addresses. | May cover defects or extend beyond a typical defects period, but exclusions, duration and claim rights are instrument-specific. |
| Insolvency risk | A retained sum may provide a source of security, subject to the contract and legal position. | The government-commissioned report notes that warranties and guarantees do not necessarily protect against contractor or subcontractor insolvency. |
| Practical fit | Requires clear accounting, release triggers and administration. | May involve upfront or drafting costs, may not suit every construction sector, and some clients may be reluctant to rely on it alone. |
The comparison reflects trade-offs identified in the government-commissioned retentions report, not a guarantee that any particular retention or warranty is adequate. Ask whether the instrument covers the relevant work, latent defects if that matters to the project, and the particular losses the parties are concerned about. Confirm the provider’s obligations and insolvency position in the actual documents before treating a guarantee as a replacement for retained cash.
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Review the clauses as a connected set. Payment timing, the right to deduct or withhold, retention release and defect remedies can interact, so a clear clause in isolation may not resolve a conflict elsewhere in the contract.
- Identify the contract and jurisdiction. Confirm the parties, project type, governing law, and whether the contract falls within relevant statutory construction-payment rules.
- Map the payment process. For each application, identify the work being valued, evidence required, valuation method, assessment date, due date and final date for payment.
- Check the notices. Find the clauses for payment notices and notices of intention to withhold or pay less. Confirm responsible parties, timing, service method and required content against the signed contract and applicable law.
- Trace each retention deduction. Confirm the calculation base, amount withheld, accounting method, release events and dates, and the treatment of defects or disputes.
- Read every warranty instrument separately. Check the claimant, covered work, exclusions, duration, start date, claims procedure and insolvency provisions.
- Resolve inconsistencies before signing. If the main contract, subcontract, schedule or warranty document uses conflicting triggers or definitions, ask for them to be reconciled in writing.
Because a missed or ineffective notice can affect payment rights, do not improvise a deadline or assume a general practice applies. For a live dispute or a substantial contract, obtain advice from a construction professional familiar with the governing law and the actual documents.
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Frequently Asked Questions
Can a contractor withhold payment for defects?
Possibly, but a defect does not by itself establish that any amount may be withheld. The contract, the required payment and withholding notices, and the applicable statutory rules determine whether a deduction is permitted and how it must be notified.
Does a construction warranty period end all legal rights?
Not necessarily. A defects period in a contract, a product warranty and other legal rights are distinct; whether a particular right remains available depends on the claim, contract and governing law.
What happens if a contractor becomes insolvent before fixing defects?
The answer depends on the contract and any separate insurance-backed or third-party instrument. Check whether the instrument expressly provides a claim route in that situation; a warranty or guarantee should not be assumed to remove insolvency risk.
Can a subcontract retention depend on the main contractor being paid?
For relevant UK construction contracts entered into after 1 October 2011, the cited government-commissioned report describes a statutory restriction on making subcontract retention release conditional solely on an event under a separate main contract. Confirm that the rule applies to the particular subcontract and check its release wording.
