Broadly, builders and their labour etc is roughly 50-60%, the other 40-50% is fixtures and fittings.
it massively depends on the amount of structural you need and the kind of F&F you source (we used online retail, lots of research and price beating, but didn’t go for the absolute basics- I wanted it all to look nice, but as cheap as I could possibly achieve that). F&F can be exponentially expensive 😂
We used a local builder, who was the middle of three quotes. There was a more expensive builder that would have given us a project manager, we did that ourselves. Your cash/ VAT situation will also massively change things.
all you can really do at this point is start getting quotes. We booked ours in 18 months ago, one week before start the builder had to add 6% due to rampant inflation hitting timber especially. i would expect the same Reno to cost at least 20% more now due to inflation, it’s much worse in trades and harder to find labour.
We didn’t decorate ourselves- you can save £5-10k that way but it’s really a lot to DIY.
20-25% contingency. We tried to run 10% like everyone does and it’s just not realistic. The bigger the project the more things come up and they do. have a backup funding source. - you WILL spend it. Think of it as the unknown pot. There is no way on earth you don’t use every penny of it though.
always run your own budget sheet the builders one will be riddled with errors and you have to show them where they have gone wrong.
quotes- go find the fanciest local builder and get the most thorough everything included quote in writing. Then go to three other locals. Write out the original quote line by line without prices and ask the new builders to quote for exactly what is on there. If they add anything the first person missed circle back- get 3/4 quotes all covering the exact same brief. Different builders will spot different issues and some will have great ideas you can take elsewhere.
see who does a lot on the road, ask locals for recommends. It’s a good sign if a lot of local Reno is going on- means other people have done the financials and it stacks up.
builders will always under quote on power points, light fittings, fire doors. Ask who does caulking and filling. They won’t include painting.
lastly- if you can live in the house prior to renovation for some time you will spot things you could do that will make a massive differences- that you might only discover post Reno otherwise. If this isn’t possible knock on all houses in street that are the same and ask nicely to see what they have done. For example, from living in the house for a year we realised that moving a staircase would transform the house, and so we did. Never would have considered it without seeing neighbours who did the same and much consideration and sketching layouts. You can put too much time into the thinking before hand.
it’s a lot, the stress is unbelievable but living in a house that you have specced is heaven and so worth it. Makes us happy every day.
good luck!