Self-Build Mortgage Guide (Existing Plot) 2026
Your complete mortgage journey — every stage, every party, every document. Select your journey below and click any stage to learn more.
Written and reviewed by Sophie Harrison · Page last reviewed 8 April 2026
What are you doing?
What type?
Self-build
Click any stage to learn more
Planning & building regulations
Obtain planning permission and building regulations approval.
Submit a planning application to the local authority (or confirm existing planning permission is valid and transferable). Building regulations approval covers structural safety, fire, drainage, energy efficiency, and accessibility. Your architect prepares the plans and your builder provides costings — while they are essential to the project, they are not parties to the mortgage itself. Some lenders require full planning and building regs approval before they will consider an application.
Sourcing & research
Review the market: rates, criteria, affordability.
Not sure which? Read our broker vs going direct guide
Fact find & advice
Broker gathers your full financial picture and recommends a suitable product.
Decision in principle (DIP)
High-level credit and affordability check with the lender.
Full mortgage application (FMA)
Complete application with full property and income detail, documents uploaded.
Specialist underwriting
Build project approvedLender assesses build feasibility, contractor credentials, and project viability.
Application & project review
Underwriters assess income, credit, and the build project feasibility.
Land valuation & GDV assessment
Surveyor values the land and projects the GDV. LTV calculated against both.
Initial drawdown
Initial funds released against your existing plot to commence the build.
Build phase & stage inspections
Surveyor visits at key build stages: foundations, wall plate, roof, first fix, second fix.
Progressive drawdowns
Funds released at each inspection stage as the build progresses.
Final inspection & completion valuation
Surveyor confirms the build is complete. Final valuation of the finished property.
Mortgage converts to standard term
Stage payment mortgage converts to a standard repayment or interest-only mortgage.
First mortgage payment
Direct debit collected, typically ~1 month after completion.