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No, there should not be a gap between your garage door and the floor. Gaps can make your garage less energy efficient, leading to higher energy bills. They also create an entry point for pests like rodents and insects, as well as rain and melted snow, which can lead to foundation damage or mold issues.

If you have a gap under your garage door, potential causes include an uneven garage floor or worn-out weather stripping. To fix it, you can try several solutions:

• Replace the weather stripping: The seal at the bottom of the door may need to be replaced.

• Adjust the garage door: You may be able to adjust the closing position on your garage door opener to eliminate the gap.

• Inspect the floor: If the concrete floor has shifted or is uneven, it may need to be repaired to create a level surface.

If these solutions do not resolve the issue, it is best to call a garage door repair specialist to inspect the door and floor.

It is typically cheaper to build a garage than to buy a prefab one if you can provide most of the labor yourself. If you plan to hire a contractor for the entire build, a prefab garage or kit will likely be less expensive. However, even with a garage kit, you may still need to hire professionals to install the foundation, concrete floor, and handle electrical and plumbing work. If you are not an experienced builder, it can be a worthwhile investment to hire a local garage builder who can manage all aspects of the project, including coordinating other necessary professionals.

You’ll usually need to prime a garage floor before painting—especially if the floor is unpainted. Garage floors are made from concrete, which is porous and produces dust. The dust can contaminate the paint and cause issues with adherence. 

Primer creates a barrier and gives you a clean surface to work on. It also minimizes absorption to help give you an even, pro-looking paint job. Make sure you choose a primer that’s specifically designed to cover concrete flooring.

It’s best to prevent cold air from entering your garage through the space underneath the garage door. Stop cold air in its tracks by adding or replacing the weatherstripping underneath the door seal. You can also add weatherstripping along the sides and top of the garage door to prevent air leakage, and it’s a relatively easy DIY fix.