Building a garage, cost $$$$
When I started looking into building a garage I got quotes around $40k for a turn key 2 car garage all stained to match the house. I looked into some pre-fab units that were advertised for $12k but they were built on piers and didn't include a floor, electric or windows, closer to $20k when complete.
My wife suggested one of these:
Which is what I wound up building. The kit price was $3500 but my town insisted on a footing down below the frost line so excavating and concrete work cost me $3k. I poured the floor with 6" thick reinforced concrete for an eventual 2 post lift which was another $k. I have a 12' wide roll up door which was $600. I did the electric and air myself so the material costs were about $500.