Copyable payment schedule for West and Central London homeowners
For a London extension or loft conversion, use a milestone schedule tied to objectively completed work: a small deposit, staged progress payments, a practical completion payment and a retained final balance. This structure protects your cash while keeping your contractor funded for materials and labour. Percentages should flex with your project’s size and cashflow, but the shape stays the same, and every payment should sit against clear, written evidence of what has actually been done.
TL;DR:
Tie each instalment to an observable milestone, such as a watertight roof or tested services, and verify hidden early work with dated photographs.
A common arrangement pays 95% through staged instalments and holds 5% until defects are corrected and invoiced; specify the cap and release trigger in writing.
Require itemized invoices showing completed work, prior payments, retention, and VAT separately, and approve every cost or scope change in writing before work begins.
Pay by card or bank transfer, not cash; purchases of £100.01 to £30,000 may qualify for Section 75 protection, and large deposits may need escrow.
Domestic renovation payment terms depend on your signed contract; statutory construction payment and adjudication rules generally do not apply to work on your own home.
Table of Contents
What each payment stage covers and how to confirm it
Every stage in a sound payment schedule has two parts: a trigger and proof. The trigger is the physical milestone. The proof is what you check on site, or ask your contractor to provide, before you release funds.
A deposit is reasonable when it covers genuine upfront costs, such as ordering materials with a long lead time or securing scaffolding and skip hire. Citizens Advice recommends avoiding large sums paid before any work starts, and suggests paying in stages rather than handing over most of the contract value upfront. If a deposit funds a specific order, such as windows or a kitchen, ask for the supplier receipt or proof the merchant account has been paid.
Early works, including strip-out, groundworks and first fix, are harder to judge because much of the result ends up hidden. This is where dated photographs and written site notes earn their keep: ask your contractor to photograph foundations before they’re covered, and first-fix pipework and wiring before plasterboard goes up.
Major milestones deserve their own line in the schedule, each with a precise, observable trigger rather than a vague description:
Roof on: covering is fully laid and watertight, with gutters and downpipes fixed, not simply “roof complete”.
First fix finished: plumbing and electrical containment installed and signed off, ready for inspection before boarding.
Plastering and second fix: walls skimmed and dry, sockets, radiators and sanitaryware fitted and functioning.
Practical completion: the property is usable for its intended purpose, with testing done, the site cleared and a signed snag list agreed.
Before releasing the large instalment tied to practical completion, walk the project with your contractor, test every system (heating, water, electrics) and agree a written snag list with dates for any outstanding items. RICS guidance on interim valuations notes that interim payments should be valued either against the work actually completed or against agreed stages, with the method set out clearly in the contract so both sides know how each sum was calculated.
Retention exists to give you leverage after the main works finish, in case defects appear once you’re living with the result. A common model, reflected in standard home-owner building contract forms, pays 95% of the contract sum across the staged instalments and holds back the remaining 5% until defects are corrected and invoiced. Our guide to retention in building contracts covers the mechanics in more depth if you want to understand how release triggers typically work.
Writing payment triggers into the contract and negotiating fair amounts
A payment schedule only works if the contract wording makes each stage objective and enforceable. Vague phrases like “roof complete” or “first fix done” invite disputes about whether a payment is actually due.
Write each trigger as a physical, checkable event: “roof covering fully laid and watertight, no temporary coverings, gutters and downpipes fixed” leaves no room for argument.
Require an itemised interim valuation or invoice at every stage, showing the work completed, the amount of any previous payments, the retention deducted and the VAT applied separately.
Set percentages against your contractor’s real cash needs for materials and labour at each stage, but cap the deposit and avoid front-loading payments ahead of the work they cover.
Agree a written variation procedure: no extra cost or extra time is committed until you’ve approved it in writing, even for small changes.
Build in a signed snagging walk-through before the final payment leaves your account, not after.
RICS interim payment guidance sets out that applications for payment should state clearly how the figure was reached, whether by valuation, by stage or by date, so you can check the maths before you pay rather than after.
Pro Tip: Ask your contractor to quote the payment schedule as a numbered annex to the contract, not just a line in the specification, so there’s no ambiguity about what triggers each instalment.
On larger jobs, Citizens Advice suggests considering an escrow arrangement or insured deposit for any sum paid well ahead of work being carried out, and preferring card or BACS payments over cash for the traceability they provide.
Protecting your money: deposits, retention, payment methods and records
How you pay matters almost as much as when you pay. Card payments can trigger protection under Section 75 of the Consumer Credit Act for amounts between £100.01 and £30,000, which makes your card provider jointly liable if the work isn’t delivered. Citizens Advice recommends paying by card where possible, and avoiding cash, which leaves you with far fewer options if things go wrong.
For larger sums, particularly deposits covering long-lead materials, an escrow account or insured deposit scheme adds a layer of protection: check the provider is FCA-registered before you commit funds. Which? flags large cash deposits as a warning sign, and recommends traceable electronic payments or escrow for sizeable upfront sums.
Retention is a risk-control tool, not a legal requirement on every job. RICS retention guidance notes that where retention is used, the contract must specify the percentage, a cap and the release trigger, and that alternatives such as a retention bond can achieve the same protection without tying up cash. On higher-value projects, ask whether retention monies can sit in a separate account rather than your contractor’s general funds.
Keep a simple file as you go:
The signed contract and payment schedule annex.
Every itemised invoice, with VAT and retention shown separately.
Dated photographs of each completed stage.
Written approvals for any variation to scope or cost.
The signed snag list from your practical completion walk-through.
If work turns out defective, raise it in writing immediately and keep every reply. Citizens Advice suggests this documentation is what makes a small-claims or alternative dispute route workable later, should it come to that.
A copyable payment timetable and worked example
A simple table format works best when you’re drafting the annex for your contract. Each row needs a stage, an objective trigger, a payment figure and the checks you’ll carry out before signing off.
Deposit: paid on contract signature, covers material ordering, checked against supplier receipts.
Mobilisation and strip-out: site set up, demolition complete, checked against dated photographs.
Structural stage: roof on and watertight, checked against the physical trigger wording above.
First and second fix: services installed and tested, checked against a walkthrough inspection.
Practical completion: property usable, snag list signed, checked against testing records.
Retention release: defects corrected, final invoice issued, checked against the defects period agreed in the contract.
For long-lead items such as bespoke windows or kitchen units, consider apportioning an earlier payment specifically against the order, rather than folding it into a general stage, so the link between cash and goods stays clear.
As an illustration only, say a £60,000 extension pays a modest deposit on signature, three staged instalments as the roof goes on, first fix completes and second fix finishes, then 95% of the contract sum in total before practical completion, with the remaining 5% held as retention until the defects period closes. The actual split should always reflect your contractor’s genuine cashflow needs and your own appetite for risk, not a fixed formula. Our guide to practical completion walks through the checks worth running before you sign off that stage.
Adjusting the schedule when scope or timelines shift
Few renovation projects run exactly to the original plan, and your payment schedule needs to flex without becoming a free-for-all. The starting point is always a written variation order: before any extra work begins, agree its cost and the stage it affects, and amend the payment annex to reflect the new figure.
If a delay pushes a milestone back, the trigger itself shouldn’t move, only the date. You’re still paying for roof completion, not for a calendar date passing, so resist pressure to release a stage payment early just because a deadline has slipped. If your contractor needs extra cash to cover a genuine change, such as an unforeseen structural issue, ask for a revised itemised valuation showing exactly what the additional sum covers before agreeing to pay it.
For larger scope additions, such as adding a loft conversion partway through an extension project, treat it as a fresh mini-schedule: its own trigger, its own payment, its own acceptance checks, bolted onto the existing annex rather than blended into an existing stage. This keeps the audit trail clear if you ever need to query what was paid for what.
Our guide to defects liability periods is worth reading alongside any scope change discussion, since extending the works can also shift when your defects period and retention release ultimately fall due.
Keeping payment approvals clear and well documented
Every payment you authorise should leave a paper trail that both you and your contractor can refer back to later. The simplest approach is to confirm each release in writing, even a short email, stating the stage, the amount, the invoice number and the date you inspected the work.
When you approve a variation, put the cost and the reason in writing before the work starts, not after it’s billed. A quick photo attached to the approval message, showing the area affected, removes any doubt later about what was agreed and when.
Keep all of this in one place, whether that’s a shared folder, an email thread or a simple spreadsheet logging each stage, its trigger, the date you checked it and the date you paid. This matters most at practical completion, when the snag list and the final invoice need to match up exactly: a written sign-off on the snag list, dated and signed by both parties, gives you a clear reference point if any item is disputed during the defects period.
Common pitfalls and scams to watch for
The biggest red flag in any payment schedule is a large cash deposit requested before work has started. Which? lists this among the clearest warning signs of a rogue trader, since cash leaves you with almost no recourse if the contractor disappears or the work is poor.
Be wary too of a contractor who refuses to itemise invoices or won’t put stage triggers in writing. Vague terms like “once the rough work is done” are designed to be argued over later, in the contractor’s favour. Pressure to pay the next instalment before a milestone is genuinely finished is another common tactic, often accompanied by reassurance that “it’ll be done by the time you check”.
Favour card or BACS payments over cash for every stage, since Citizens Advice notes the traceability and, in the case of card payments, the potential Section 75 protection this gives you. If a project involves energy compliance items with long lead times, such as a SAP calculation for an extension, our partner’s guide to SAP calculations for London homeowners explains how those timelines can affect when certain payments fall due.
Your legal protections as a homeowner
The statutory payment rules that apply to commercial construction contracts generally don’t extend to work carried out on your own home: Part II of the Housing Grants, Construction and Regeneration Act 1996 is built for business-to-business contracts, not domestic consumer work. For a homeowner’s renovation, your payment terms are instead governed by whatever the contract itself sets out, which is exactly why getting the schedule right in writing matters so much.
That doesn’t leave you unprotected. The Consumer Rights Act 2015 still applies to any contract you sign as a consumer, giving you rights around work being carried out with reasonable care and skill, within a reasonable time, and for a reasonable price where none was agreed. If a dispute arises over a stage payment or the quality of work behind it, Citizens Advice sets out the practical steps for raising a complaint and escalating it if necessary, from a written notice through to alternative dispute resolution or a small-claims track.
Because the statutory adjudication regime doesn’t apply here, the contract is doing all the work: every protection you want, from retention terms to variation approval, needs to be written into the agreement itself rather than assumed from the law.
Agreeing the schedule with your contractor before work starts
The best time to settle your payment schedule is before you sign anything, not once work is underway and leverage has shifted. Ask for the proposed schedule alongside the written quotation, and treat it as a negotiable document rather than a fixed term.
Start by matching the stages to your contractor’s genuine cashflow needs: materials with long lead times justify an earlier payment, but the bulk of the contract sum should track the bulk of the physical work. Push back on any deposit that feels disproportionate to what it’s actually funding, and ask for supplier receipts if a large sum is tied to an order.
Agree the retention percentage and release trigger at this stage too, not after practical completion when it’s harder to negotiate. If your contractor is unwilling to put stage triggers in objective, checkable language, treat that as a conversation worth having before you commit, not a detail to sort out later. Our guide to choosing a builder covers the wider vetting process that should sit alongside this negotiation, since the right contractor relationship makes the payment schedule far easier to agree in the first place.
How we structure stage payments and snagging on West and Central London projects
We set out written stage schedules and itemised invoicing on projects, with oversight across each instalment from deposit through to retention release. That written clarity reduces the friction that often turns retention into a point of conflict, because both sides know in advance what triggers each payment and what evidence supports it.
— Mateja
Get a tailored payment schedule from us
We build a stage payment schedule into every written quotation, tailored to your project rather than copied from a template, with itemised invoicing and director oversight from deposit to retention release.
A payment timetable matched to your extension, loft conversion or refurbishment scope.
Itemised invoices showing completed work, previous payments and retention at every stage.
Local experience across West and Central London projects, from first survey to final sign-off.
If you’re planning a project, request a site visit for your extension and we’ll prepare a schedule you can review before you sign anything.
FAQ
What is a reasonable deposit for a home renovation?
A reasonable deposit covers genuine upfront costs, such as ordering materials, rather than a large share of the total contract. Citizens Advice recommends paying in stages and avoiding large sums before work starts, and asking for proof when a deposit funds a specific order.
How does retention work on a home renovation contract?
Retention holds back a percentage of the contract sum, commonly reflected in home-owner contract forms as 95% paid across staged instalments with the remaining 5% released once defects are corrected and invoiced. The percentage, cap and release trigger must be specified in the contract itself, since RICS guidance treats retention as optional rather than automatic.
Does UK construction payment law apply to homeowner renovation contracts?
The statutory payment and adjudication regime under the Housing Grants, Construction and Regeneration Act 1996 generally doesn’t apply to contracts for work on your own home. Instead, your payment terms come from the contract you sign, so writing clear stage triggers and retention terms into that document matters more than relying on statutory default rules.
What should an interim invoice or valuation show?
An interim invoice should show the work completed to date, any previous payments, the retention deducted and VAT shown separately, so you can check the calculation before paying. RICS interim valuation guidance sets out that the method, whether by valuation, stage or date, should be stated clearly in the application.
How can I protect a deposit or stage payment on a renovation?
Pay by card or BACS rather than cash, since card payments can carry Section 75 protection and both methods are traceable if a dispute arises. For larger sums, Citizens Advice and Which? both recommend considering an FCA-registered escrow or insured deposit arrangement rather than paying a large sum directly.
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