What are the standard dimensions for a double car garage?

Whatever the standard is, add some.

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Whatever the standard is, add some.

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Yes. Nobody has ever complained about too much room in their garage.

According to the fricking home builders now 20x20. Build it as big as you can, you will not regret it.

just built one....30 deep by 25 wide. 18 is the larger size door opening with 16ft standard. Anything other than that is custom and $$$.

30 will give room for shelving on the back wall. with shelving on both sides 25 will be adequate, but i wouldn't mind another foot on each side.

It’s sort of like building a shed.
Bigger is better

Make sure it is at least two bays 12+’ wide X 24’ deep. Don’t put one opening. I have never met a woman who will leave enough room for the other vehicle.

TD.com always does things bigger than normal. Don't listen to them about what "standard" is.

New homes have 16' or sometimes 18' wide doors. The garages aren't much wider than that. The garages in most of the new homes in Livingston Parish are 18x18.I've seen some DSLD and DR Horton homes that are a little smaller. People just park one vehicle in there if at all.

Standard before those stucco homes became normal was 20x20 in baton rouge because they were "car ports" without doors, but obviously some opted for bigger. An older home that was built with doors in mind probably was 22x22, with an 18' door.

Neighborhoods with $330k+ homes in the BR area often have larger garages. 22x22 at least, but often 24x24 or so but I'm not sure I would call it standard. You get much bigger than that and you need 3 separate doors to really take advantage of it, which you do see sometimes.