I’m trying to assess if this is worth it before talking to contractors. I’ve done a lot of DIY remodels and hired out some but never anything of this magnitude. I want to build an addition on top of the garage and connect to the rest of the 2nd floor. Here’s some assumptions I have.

-The slab foundation appears to have same construction as the rest of the house. Let’s assume the footings are good for a second floor

-The joists and walls in the garage do not appear to be structured for a second floor. Will need to reinforce garage walls and add joists.

-This project would coincide with an already planned new roof and HVAC upgrade. So HVAC could be sized for the new square footage

Houses are going for about $275 square foot in our area. This will add about 250 square feet to the house. So if this could be done for $60k or less I won’t lose equity.

1. Any success or horror stories with this sort of thing?
2. Any one tackle something like this as your own GC?