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You can drywall over plaster, but there are some things to consider. First, installing drywall over plaster will increase the wall’s thickness. This could create challenges for window and door frames that no longer fit the wall’s thickness. You may also have to adjust power outlets so they are accessible. When done right, drywall can create a smooth, flat appearance, but it’s best when handled by professionals.

In most cases, no, you won’t need a permit to replace drywall. If you’re changing the floorplan of your home by adding or removing walls during the drywall project, then you might need a permit, but replacement or repairs usually doesn’t require a permit. Your drywall professional should be able to confirm whether or not a permit is required for your project. If it is, it’s likely to add between $50 and $150 to your total cost. Keep in mind that you will need permits if you plan to install new electrical wiring or plumbing lines behind your new drywall.

Drywall installation costs around $2,000 on average, but some projects cost as low as $400, while larger or more complicated installations can cost $6,000 or more. The most important cost factor is the size of the room or area, as many contractors charge on a per-square-foot basis. You should also consider the complexity of the installation. If you have large, flat walls with few wall openings, you’ll pay less than if you have multiple windows and doors to cut around, corners, or curved walls.

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.