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Note that permitted development requires materials to ‘match’ the house - which is why an ugly generic 50k(ish) PD dormer box is clad in hung tile.
It shouldn’t be contentious to get planning permish for similar box but with zinc cladding - but it does change the application procedure - councils will have an ‘spg’ resi design guide which might actually be more restrictive than PD rights so is worth reviewing.
Also - re. “Architects” you absolutely don’t need one but in theory they should add value - increase the quality of outcome across the board and in the first instance help you to figure out what you want, need vs what you might afford.
I doubt the rear extension examples up thread are coming in at sub 100k (especially these days). But they are unique and by published/highly regarded design led firms - you get what you pay for - I’d argue they actually achieve a lot with relatively little budget.
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I used these https://www.danjamesconstruction.com/ who cover North London.
I found them very good but I know @brokenbetty used them for something architect designed and had some issues.
I guess that may also be an issue in that the loft companies who bang the conversions out probably prefer nice, easy designs.
I used an all in one company. Architect wasn't great at coming up with plans himself but once I said exactly what I wanted and referenced other plans it was fine.
It was a generic box from the outside though and if I'd wanted something unique I probably would have gone with my own architect. Just didn't feel it was worth it for an outside that I'd rarely see though