Built a new garage for me last year. I had no previous experience of building/renovating or working with builders, or even how to find a decent builder. These guys were working at the house over the back fence and jumped over to give me a quote! Friendly, down to earth, were able to give me a solid quote. Also got a good reference for them from a mutual friend who works in the industry and knows them well.
Work seems solid, happy with it. Had a hiccup with the wiring from the house to the garage - unsafely installed for the landscaping that followed - they returned and fixed it in a few days. Am aware that a small area of wiring up the side of the house to the fuse box isn't properly insulated - should be covered with a safer piece of tubing, apparently? Wouldn't have known about this except their electrician told my landscaper he'd come back and fix it, and "don't mention it to the client"! Never came back to fix it, but I didn't chase it up either - had had enough of building/landscaping complications by then, and just thought I'd rather get it fixed myself than rock the boat.
They helpfully installed the shelves and pegboard I bought into the garage for me, and installed the clothesline onto the outside wall, which I appreciated very much - probably small jobs for them but would've been major undertakings for me.
Were slow at getting things done, everything seemed to be delayed just that little bit.....and again. Wouldn't have bothered me overly but the landscaper needed them to finish so he could begin.
Was a bit of communication breakdown about painting the interior of the garage, but got sorted quickly, and I think I was equally at fault on that point.
Also a delay in getting the certificate of completion at the end, partly due to the builders, partly due to the independent construction engineer (or whatever he's called) - got sorted after several phone calls by me.
They also sorted out a problem with my roofer for me, literally overnight, that I'd been trying to resolve for about 2 months (this was after I told them they definitely weren't using that roofer for the garage)! Greatly appreciated this! They could've just kept their working relationship with the roofer by blaming the client (me) for being fussy or whatever, but they went to bat for me and got him to finish the work on my roof.
Overall, I was happy with their work, they were a bit slow, but I'd use them again happily and just know that things might be a bit delayed.

Approximate cost: $34 000