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owl
What I did, which worked for me, was get a general builder to do the knock through and RSJ - using structural calculations from a website and applying to building control myself, then get a window company to do windows and doors and lintel, then get a general interiors guy to do all internal stuff like kitchen and bathroom. The interiors guy subcontracted a tonne of other trades without me having to get involved.
I was told at some point that most general builders don't bother with windows because people want FENSA certification and guarantees (which also means building control not needed) -and FENSA qualification is a hassle unless you do windows all day every day.
I'm sure you could go about it other ways but for me this seemed the best combination of cost effectiveness and minimum hassle.