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Phase 1 · Planning & Permissions · Task 14 of 16

Financing Your Extension: The Real Options for Homeowners

How to pay for a UK extension. Further advance vs remortgage vs second-charge vs personal loan, MCOB stress test, Section 75 deposit protection, and the products to avoid.

20 min read4-8 hours research and modelling on siteUpdated 2026Free with email

The expensive mistake is choosing the route before you know the number. People spend weeks comparing 0.2 percentage points on personal loans before they've added up what the build actually costs, then discover halfway through groundwork that the personal loan they took maxes out at £25,000 and the steelwork alone is going to swallow most of it.

Get the contingency-inclusive total first. That sits in Budgeting for Your Extension, and applying the 15-20% rule there is not optional. Once you've got a real number, choose a route to fit it. Not the other way around.

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