A self-build mortgage broker is a specialist financial adviser authorised and regulated by the FCA (Financial Conduct Authority) who sources and arranges self-build mortgages from specialist lenders. Unlike standard residential mortgages that release the full loan at purchase, self-build mortgages release funds in stages as the build progresses - either in arrears after each stage is inspected (arrears stage) or in advance before each stage begins (advance stage). Given the small number of lenders active in the self-build market and the complex documentation required, a specialist whole-of-market broker is essential for most self-builders.
What they do
- Self-build mortgage sourcing from specialist lender panel
- Arrears-stage or advance-stage product selection and advice
- Cash flow planning for stage payments throughout the build
- Land purchase finance and bridging loan arrangement
- Custom build mortgage advice for serviced plot schemes
- Help to Build equity loan scheme applications
- Bridging finance for plot purchase prior to main mortgage
- Lender communication and mortgage management throughout build
When you need one
A self-build mortgage broker is needed at the earliest stage of planning your self-build - ideally before you commit to buying a plot - to establish your borrowing capacity and cash flow requirements.
Typical fees (UK, 2025)
| Fee type | Typical amount |
|---|---|
| Broker fee (fee-free route via procuration) | Free to borrower |
| Broker fee (fee-charging route) | 0.5-1% of loan value |
| Help to Build equity loan | 5-20% loan on eligible builds |
| Self-build mortgage arrangement fee (lender) | £999 - £1,999 |
| Valuation fees (lender instructed) | £500 - £1,500 |
Many specialist self-build brokers charge no direct fee to the borrower, receiving procuration fees from lenders instead. Always ask about the full cost including lender arrangement fees before proceeding.
Qualifications to look for
Any broker advising on or arranging regulated mortgage contracts (including self-build mortgages) must be authorised by the Financial Conduct Authority. Verify at register.fca.org.uk before engaging. This is a legal requirement, not an optional quality standard.
CeMAP is the standard industry qualification for mortgage advisers in the UK, awarded by the London Institute of Banking and Finance (LIBF). Level 3 CeMAP is the minimum qualification required for FCA authorisation to advise on mortgages.
A whole-of-market broker can access all available self-build lenders; a specialist self-build broker has deep relationships with the handful of lenders active in this niche. Ask whether the broker has access to all relevant self-build lenders before proceeding.
How to find a reputable self-build mortgage broker
Frequently asked questions
What is the difference between arrears-stage and advance-stage self-build mortgages?
Arrears-stage mortgages release funds after each build stage is inspected and certified - you need sufficient cash or bridging finance to fund each stage upfront. Advance-stage mortgages release funds at the start of each stage, reducing the cash you need to have ready - but they typically carry a higher interest rate.
How much can I borrow for a self-build?
Most lenders offer up to 75-80% of the completed property value or 85% of land and build costs - whichever is lower. Some specialist lenders go higher for experienced borrowers.
Can I get a self-build mortgage if I am not building it myself?
Yes - you can use a contractor and still access self-build mortgages. You do not need to physically build it yourself. What matters is that you are managing the project rather than a developer building it for sale.