Self-Build Mortgage Stage Payments Explained

By PMS Mortgages · Published 7 November 2026 · Meet Ria Ali

A self-build mortgage works differently from a standard mortgage. Instead of lending the full amount on completion day, the lender releases money in stages as your home is built. Getting the stages and your cash flow right is the difference between a smooth build and a stalled one.

How stage payments work

Your build is split into stages agreed with the lender. Before each payment, the lender's valuer usually visits to confirm the work is done and the property is worth what the lender expects at that point. Typical stages are:

1. buying the plot, where the lender will fund it

2. foundations

3. wind and watertight: walls, roof, windows and doors

4. first fix: plumbing, wiring and internal walls

5. second fix and finishing

6. completion and final sign-off

Some lenders use fewer, larger stages and some use more, smaller ones. Fewer stages can mean longer gaps between payments, so it pays to compare.

Arrears or advance: why it matters

With arrears stage payments, money is released after each stage is finished. You need enough savings or other funds to pay your builder for that stage first, then the lender pays you back. This is the more common option.

With advance stage payments, money is released at the start of each stage, so you are paying the builder with the lender's money rather than your own. This makes cash flow much easier, but fewer lenders offer it and the costs can be higher.

The right choice depends on how much cash you have, how your builder wants to be paid and how long each stage will take.

Planning your cash flow

• Ask your builder or project manager for a stage-by-stage cost breakdown and payment schedule.

• Line each builder payment up against when the lender will release funds.

• Allow for gaps: valuer visits and releases take time to arrange.

• Keep a contingency for overruns. Lenders will rarely increase the loan part-way through.

• Remember costs that sit outside the stages, such as planning, warranty fees, connections and temporary accommodation.

What lenders want before the first release

• full planning permission and building regulations approval

• architect's drawings and a detailed build costing

• details of who will carry out the work

• a structural warranty or architect's certificate for the finished home

• evidence of your deposit and contingency

When the build is finished

Once your home is signed off, the self-build mortgage can usually move onto, or be refinanced to, a standard residential mortgage. Planning this at the start avoids being left on a more expensive rate.

Talk to us about your build

We arrange self-build mortgages with fee-free advice, and can help you choose between arrears and advance stage payments. If you are building to sell or let instead, see our development finance page.

Your home may be repossessed if you do not keep up repayments on your mortgage.