@Namchange101 size might make a difference though, as it essentially works out at just over £3,000 per sqm. Our extension is 25 sqm, but the extension bit doesn’t include a kitchen or bathroom. We have a fair bit of steel going in, but nothing massive, so no full width mega steels or bifold doors. A lot of our work is around reconfiguring the existing layout of the house and renovating it all.
We deliberately kept the design simple and although the kitchen and bathrooms are moving, they are still in the right areas for existing plumbing and drains, which saves a lot. Our builder was great for advising us on things like this through the planning process.
We haven’t gone for an ‘all-in-one’ building company either. Essentially our builder is doing some work himself, but also acting as project manager and bringing in different trades that he has known and worked with for years and considers reliable and trustworthy. I think doing it this way is supposed to work out cheaper as well, but you have be sure you trust the project manager.
We were told a year ago that it would be at least twice the price to do a double storey extension, so heaven knows what it would cost now. Beats me how anyone manages it without going over the ceiling price for their properties these days. Two houses on my parents road have just been gutted. All big 4/5 bedroom detached houses. Dad told me today that they literally pulled out what looked like brand new bathrooms and skipped the lot. They must have money to burn!