5 bedroom big semidetached in an expensive bit of the north west. Quoted before lockdown and they kept to the quote. We budgeted £175kand it came out at about £200. About £10k unexpected issues and the rest stuff we added on.
big extension, new kitchen, moving a staircase, internal reworking, 2 new bathrooms and new plumbing system.
we looked at putting in air source heat pump, but just couldn’t, despite best efforts, insulate the house enough.
but if you are going to do it, now is the time as you’ll need different pipe work and radiators and/or underfloor heating.
first thing we did was a very detailed budget, everything including decorating, carpets, new furniture we’d need, curtains, refurbishment of flooring, the garden being reinstated and new paving…
it’s all possible, but you’ll need a decent contingency, and a good builder.
we lived in it, the worst bit was the bathrooms…lot of dust. And the moving of the staircase…
lit would have been a lot quicker and easier if we hadn’t been living there but it was really handy being on site to stop stupid stuff happening and to make sooo many decisions every day. So I would probably do that again…