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Sorry - yes + VAT is pretty important!
If you’re not experienced and like to accurately budget then I fully agree - get an architect to design it, get planning, get working drawings done, get a quantity surveyor to count how much of everything you need. Builders can then price accurately and you won’t have the stress of them coming back asking for more £ if they run in to something they didn’t account for.
Hefty
IME you’ll be under a lot less stress if you have more than enough ( double !) in the bank to cover the “what the internet says it might” cost of the project and then specify and tender the project competitively to get value and give you wiggle room etc. Have a professional design it and do a line by line schedule of works to be costed.
Don’t forget VAT 20% obvs and fees 10-15% of construction on top of those indicative pSm rates btw.