Self-Build Mortgage Rates 2026 — Updated October 2026
- Typical self-build mortgage rates
- 5.5%–7.0%Typical self-build mortgage rates
- Arrears or advance
- Stage paymentsArrears or advance
- Typical deposit of land and build costs
- 20%–25%Typical deposit of land and build costs
- Last updated
- October 2026Last updated
A self-build mortgage releases money in stages as your home is built, then usually converts to a standard mortgage. Rates sit above mainstream mortgages — typically 5.5%–7.0% in October 2026 — because the lender is funding an unfinished home.
What a self-build mortgage costs: worked example
- Monthly payment
- £1,933 a month
£300,000 at an indicative 6.0% over 25 years once fully drawn.
During the build you pay interest only on the stages released.
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The figures above are indicative and describe the best case. Send your own scenario and we will come back the same working day with terms from the lenders that actually fit it.
- Enquiry type
- Development Finance
- About
- Self-Build Mortgage Rates
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Enough detail to price it is the amount, the security, the purpose and how you plan to repay. The rest we can fill in on a call.
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Rate context and outlook
Senior development finance currently prices from about 8.8% a year for low-leverage ground-up schemes, with most facilities at 9.5%–12%. Bank Rate is 3.75% after the 17 September hold; development lenders price off their own funding costs, so rates have stayed stable through the September swap-rate rise, and some lenders cut margins over the summer.
Lenders now expect tighter information on build costs, drawdowns and exit before committing.
Reviewed by David Doulton, Director, Doulton Bridging Finance — over 20 years in property finance. Last reviewed 1 October 2026. Doulton Money Ltd t/a Doulton Bridging Finance, FCA No. 814533.
Frequently asked questions
What is the difference between arrears and advance stage payments?
Arrears pay after each stage is complete; advance pays before, so you need less cash upfront.
What deposit do I need for a self-build?
Usually 20%–25% of land and build costs.
Does a self-build mortgage convert to a normal mortgage?
Usually, once the home is complete and signed off.
How are funds released?
In stages as the build progresses, usually in arrears, after a monitoring surveyor confirms the work is done.
Do I need planning permission?
Senior development finance usually requires full planning; sites without it are funded with land bridging first.
How long does it take to arrange?
Usually 4–8 weeks, depending on valuation, the monitoring surveyor and legal work.
What is the difference between LTGDV and LTC?
LTGDV compares the loan with the finished value; LTC compares it with total costs. Lenders apply whichever is lower.
What if the build overruns?
Lenders expect a 5%–10% contingency. Overruns beyond it are usually funded by the developer, or by agreeing an extension.
Where this applies
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Independent whole-of-market advice · FCA No. 814533