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I think poor choice of language aside, there would be a full job, a part job and nothing. Of course there is a sliding scale to the quality of the work/space and people will value this differently when living/buying/selling. But I would still suggest that doing a full/proper job for the majority of people should be the option to go for and fully explored before doing something alternative.
Mine wasn't 'dodgy' or 'weird' - I'm an architectural technician and it was constructed properly (just by me)
I think there are options apart from handing over £££ to a builder and you are happy to take on some of the work yourself