You could brace the inside of your garage and use hydraulic lifts to raise the roof.
How to raise roof height on a garage.
Cost of raising a roof on a house.
You might also try raising the actual garage itself but this obviously has structural challenges.
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Additional support may be needed if the roof is not very stable.
If it is a detached garage and what we call western platform framing 2x4 framing sole plate top plate then detach the earth quake anchors and go along jacking up the structure a 2x4 width at a time every 4 ft until you reach the desired height.
A vaulted ceiling with collar ties usually has a large flat area above the sloped sides.
It typically costs between 15 000 and 125 000 and up to raise a roof on a house removing replacing or moving plumbing and electrical work can increase price.
Consult a contractor for an estimate.
Raising garage door height i think garage door panels are sized in 3 increments.
So just get one new panel for each side if you need to raise it up a few.
If you want the ceiling vaulted all the way to the top it gets a little more complex and you ll need a structural ridge beam.
The cost breaks down to 40 materials and 60 labor if there s a problem that needs fixed roof repairs averages at 850.
Nationally the cost to replace or install a roof is about 8 000.