Stage Payments and Retention: When to Pay Your Builder

Your builder wants the next payment. He says the foundations are in and it's time for stage two. You haven't actually checked the foundations. You're not sure what "stage two" is supposed to include. And you've already handed over 25% of the total cost upfront.

In short: Stage payments are structured payments tied to completed milestones - not dates, not promises, not the builder's cash flow needs. Combined with retention (2.5-5% held back until the defects liability period ends), they're your most powerful tool for keeping a project on track and protecting your money.

This is the single most important financial decision you'll make on any building project. Get the payment schedule right and you maintain leverage throughout the build. Get it wrong and you're hoping for the best.

Why stage payments exist

Building projects are expensive. A builder can't fund an entire £80,000 extension out of pocket, and you shouldn't pay for the whole thing upfront. Stage payments solve this by splitting the total cost into chunks, each one released when a defined milestone is reached.

The principle is simple: you pay for what's been done, not what's about to be done. Each payment corresponds to a visible, inspectable piece of completed work. The builder gets regular cash flow to fund materials and labour. You maintain financial control and never get too far ahead of the work.

This isn't about trust. It's about structure. Good builders welcome a clear payment schedule because it removes ambiguity. If a builder resists stage payments and wants large sums upfront, that's a red flag. We cover this in detail in our guide on builders who want a 50% deposit.

Typical payment schedules by project size

There's no single "correct" payment schedule, but there are industry norms. Here's what's typical for different project sizes:

Small projects (under £15,000)

Bathroom refits, small landscaping, internal refurbishment.

On small projects, retention is less common (though still good practice). The deposit should cover initial materials. You should never be more than one stage payment ahead of the work.

Medium projects (£15,000-£60,000)

Kitchen extensions, loft conversions, garage conversions.

This is the sweet spot for most residential projects. Five or six stages give you regular checkpoints without drowning in admin. Each stage is visually verifiable - you can see that the foundations are in, the walls are up, the roof is on.

Large projects (£60,000+)

Full house renovations, new builds, multi-storey extensions.

On larger projects, more stages mean more control. The deposit is proportionally smaller because the total sum is bigger - 5% of £150,000 is still £7,500, which is plenty for initial material orders.

The golden rules of stage payments

Whatever the project size, these rules apply:

1. Pay for completed work, never for future work

Every payment should correspond to work you can see and verify. "I need the money to order the steel" is not a stage payment - it's an advance. If the builder needs to pre-order expensive materials, build that into the payment schedule formally: "Stage 2: structural steel delivered to site and foundations inspected - 20%."

2. Inspect before you pay

Before releasing each payment, walk the site and check the work. You don't need to be an expert - you're looking for obvious issues. Are the walls straight? Is the brickwork consistent? Does the plastering look flat and even? Our guide on how to check builder work covers what to look for at each stage.

If something doesn't look right, say so before you pay. It's much easier to get a problem fixed when you're holding the money than after you've released it.

3. Keep records

For every stage payment, keep a written record: the date, the amount, what work it covers, and confirmation that you've inspected it. An email to the builder saying "I've inspected the foundations and I'm releasing stage 1 payment of £12,000 today" creates a clear audit trail.

This matters if there's a dispute later. See our guide on protecting yourself during building work for more on documentation.

4. Never pay more than the work is worth

Add up your stage payments at any point in the project. The total should never exceed the value of work completed to date. If you've paid 60% of the total but only 40% of the work is done, you're overexposed. The builder could walk away and you'd have paid more than you've received.

This is the most common payment mistake homeowners make. The early stages (deposit + foundations) should be modest because the work completed at that point is modest. The big payments come later when the bulk of the work is done.

5. Build in the final payment as leverage

Your final stage payment (before retention) should be at least 10-15% of the total. This is the money that motivates the builder to finish the snagging, get building control sign-off, clean up the site, and hand over properly. If the final payment is only 2-3%, they've got very little incentive to come back for the last few jobs.

Retention explained

Retention is money you hold back from the builder - typically 2.5% to 5% of the total contract value - as insurance against defects that emerge after the work is finished.

Here's how it works:

1. At practical completion, you release the main payment minus the retention amount.
2. The defects liability period begins - usually 6 to 12 months.
3. During this period, you live in the space and note any defects.
4. At the end of the DLP, the builder returns to fix any outstanding issues.
5. Once everything is resolved, you release the retention.

On an £80,000 project with 5% retention, that's £4,000 held back for 6-12 months. It sounds harsh, but it's standard practice in construction - from £30,000 house extensions to £300 million office blocks. The builder knows about it from the start. It's in the contract.

Retention protects you against:

• Settlement cracks - Buildings move as they settle. Hairline cracks in plaster are normal in the first few months and should be repaired by the builder.
• Leaks - A shower tray that seems fine but develops a slow leak over weeks. A flat roof that only leaks in heavy rain.
• System issues - Heating that works in September but reveals problems in January. Drainage that backs up during the first big storm.
• Material defects - Tiles that crack, grout that discolours, sealant that fails.

For a full explanation of what practical completion means and how to handle the snagging process, see our practical completion guide.

What to inspect before each payment

You don't need to be a surveyor, but you should check the basics at each stage. Here's a quick guide:

Foundations

• Correct depth (check against the structural engineer's specification)
• Building control has inspected before concrete was poured
• Damp proof course (DPC) visible and correctly positioned - see our guide on what a DPC should look like

Walls / superstructure

• Walls are plumb (use a spirit level)
• Brickwork is consistent with even mortar joints - our brickwork quality guide explains what to look for
• Lintels above openings are level
• Wall ties visible at correct spacing

Roof

• Roof structure matches the approved drawings
• Felt/membrane properly laid
• Tiles/slates straight and secure - see our roofing work guide
• Flashings fitted at junctions with existing walls

First fix

• Wiring runs where you expect sockets and switches - our electrics guide covers this
• Plumbing runs to correct locations - see the plumbing and drainage guide
• Insulation installed to correct specification
• Any structural steelwork properly fitted - our steelwork guide has the details

Second fix and finishing

• Plastering smooth and flat - see our plastering quality guide
• Sockets, switches, and light fittings all operational
• Kitchen and bathroom fitted to specification
• Decoration complete and even

Warning signs in payment schedules

Watch out for these red flags:

"I need 50% upfront for materials." No. A legitimate builder can source materials on account or with a modest deposit. A 50% upfront demand is the single biggest red flag in residential building. Read more in our guide on builders wanting large deposits.

Vague milestones. "Stage 2: mid-build" doesn't mean anything. Every milestone should be specific and verifiable: "Stage 2: external walls to wall plate level, building control inspection completed."

Front-loaded schedules. If the first three payments add up to 70% of the total but only cover foundations and walls, the schedule is weighted in the builder's favour. You should never have paid more than the work is worth.

No mention of retention. If the builder's payment schedule goes straight to "final payment = 100%," there's no retention built in. Add it. Any builder who objects to a standard 5% retention is telling you something about their confidence in their own work.

Payments tied to dates, not milestones. "£10,000 on the 1st of each month" is not a stage payment schedule - it's a subscription. Payments should be tied to completed work, not the calendar. Weather, material delays, and subcontractor availability all affect timelines. You shouldn't be paying for a month where nothing happened.

Cash-only requests. If the builder insists on cash payments with no receipts, walk away. See our post on whether to pay your builder in cash for the full breakdown of why this is risky.

What if the builder asks to change the schedule?

It happens. The steel delivery is delayed by three weeks. The builder asks for an advance payment to cover materials for the next phase while they wait.

Before you agree, ask:

• Is the current stage actually complete? If not, the existing payment isn't due yet. Don't pay for an incomplete stage and advance money for the next one.
• Can they evidence the material cost? If the builder needs to pre-pay for expensive items (a structural steel beam, a bespoke window), ask for the supplier's invoice. Pay the supplier directly if possible.
• Does it change your overall exposure? Add up what you've paid versus what's been completed. If advancing a payment means you've paid more than the work is worth, the answer is no.

A reasonable builder will understand your caution. An unreasonable one will pressure you. Trust the structure over the relationship.

Setting up the payment schedule

The payment schedule should be agreed in writing before work starts. It should be part of your contract - whether that's a formal JCT contract, an FMB (Federation of Master Builders) contract, or a bespoke agreement.

The schedule should include:

• The total contract sum
• Each stage milestone (specifically described)
• The payment amount or percentage for each stage
• The retention percentage and defects liability period
• How provisional sum adjustments will be handled
• Payment terms (e.g., payment due within 7 days of stage completion)
• What happens if a stage is disputed

Get this right at the start and you avoid most payment disputes. Get it wrong - or worse, don't have one at all - and you're navigating with no map.

Quick checklist

Before agreeing a payment schedule:

• Every payment is tied to a specific, verifiable milestone
• The deposit is no more than 10-15% of the total
• Cumulative payments never exceed the value of work completed
• Retention of 2.5-5% is clearly stated
• The defects liability period (6-12 months) is defined
• You've agreed to inspect each stage before releasing payment
• The schedule is in writing, signed by both parties
• Payment method is bank transfer with clear references (not cash)

Want to check whether your quote's payment terms are reasonable? Upload it to MyBuildAlly and we'll analyse the payment structure alongside the pricing and scope.

Sources

• JCT (Joint Contracts Tribunal) - Standard form contracts covering stage payments, retention, and defects liability
• RICS (Royal Institution of Chartered Surveyors) - Professional guidance on contract administration and payment certification
• FMB (Federation of Master Builders) - Homeowner contract templates with built-in payment schedules
• Consumer Rights Act 2015 - Your statutory rights when paying for building services
• GOV.UK - Paying for building work - Government guidance on building work and your rights