You can raise it up with more sand and gravel until you reach the desired height.
Raising my garage roof.
Finally fill in the outside of the wall with tapered pieces of sheathing and siding.
If you want to raise your garage roof you might as well just tear off the old roof scrap it including your top sill plates.
You could brace the inside of your garage and use hydraulic lifts to raise the roof.
Before applying the finish siding install metal flashing over the sheathing and let the flashing run 3 in.
It has a pitched roof using modern w style trusses and concrete tiles.
Ways that have crossed my mind but of which i have no idea that would pass muster would be.
Lift garage poor small wall and set garage ontop of wall.
Below the top of the foundation wall.
If you need to lift the walls again the gap will stay covered.
Lift garage lay a few course of block and sit garage back down on blocks.
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Build a small framed wall of desired height increase lift garage and secure to new mini wall.
Consult a contractor for an estimate.
Additional support may be needed if the roof is not very stable.
I want to increase the headroom in the garage so that i can put in a car lift into the garage which allows 1 car to be raised and another car to park directly underneath.
The major downside to it is the height of the door opening at about 1 9m and the floor to ceiling height of approx 2 4m.
Approaches to raising the roof.
Currently whilst the pitch roof is of substantial height the trusses get in the way of access the full height.
If a gap doesn t close up try laying a plank across the roof and pound on it with a sledgehammer.
Then place the poles back on the spot they came from but higher now.
If you are in a situation where you can t remove the posts then you can attach extenders to the top of the posts that are already in place.
I doubt if you can use your existing trusses.