Conservatory Options

[Nom de ploom]

probably an FAQ so apologies for any repetition but my OH needs a place to work from home (counselling, Pscyhotherapy etc) and we havea number of options.

Part garage conversion - average quote thus far c £4,500
DIY conservatory £2,400 for a 3m x 3m but not sure on quality or how hard to DIY, would it be about as much again to have it built??
dwarf wall conservatory - what ground works are needed etc its a new build property so it might infringe on the housebuild gaurantee?

the other alternative is a summer house but again not sure what ground works are needed, whichever option we'd need a sparky to do the garage or summer house wiring...

is there a buyers or options guide somewhere? the missus ahs tasked me as a project manager for this...

thanks in advance

[Nom de ploom]

so for a new build garage with a flat floor, high roof (no roof storage), and a partial say 1/3rd conversion to include an o/s door, window and electrics is about £4,500 a fair enough quote?