You might also try raising the actual garage itself but this obviously has structural challenges.
Raise my garage roof.
Roof lifting costs vary significantly.
Prices fall anywhere between 5 and 20 per square foot and beyond.
Most of the lifting that will correct your sagging east wall will be from the eastern corners of the north and south walls.
Generally speaking it will cost more to lift the roof on an attached garage than a detached garage.
From the garage floor.
Consult a contractor for an estimate.
You could brace the inside of your garage and use hydraulic lifts to raise the roof.
Additional support may be needed if the roof is not very stable.
The jacks should allow you to raise the roof a couple of inches at a time while the cripples you attached to the top plate and short studs will help keep the roof in place.
Long 2 8 ledgers to the northeast and southeast walls about 2 ft.
Once the ledgers are up drive three double headed 16d form nails through the ledgers into each stud.
If for some reason you need to stop your project you can nail or screw the cripples to the original studs to temporarily secure the roof and resume when you are ready.
Raise the roof to create more cubic feet of space beneath it raise the pitch of a roof from flat or low slope to something steeper for aesthetic and practical reasons add a second floor new top story covering part or all the home add a dormer to an existing top floor to change the look of your home add light and gain headroom inside the dormer.
Roof lifting cost for garage.
This is because it affects components of your home including but not limited to.
Approaches to raising the roof.