Looking for some advice. Bought a house last year and looking to do an extension. Put 15% deposit down initially. Looking at borrowing £25k. Spoke to mortgage company about releasing some equity but that's not an option it seems as LTV isn't below 80%. Naturally we will build the equity before the fixed rate runs out in 5 years. Is there any finance option that doesn't have your eyes out (other than parents loaning) that could be paid off in full within 5 years?