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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.

It is less expensive to install a drywall ceiling. Drop ceilings are generally more costly to install than drywall, but they're also easier to install. Drywall sheets are heavier than drop ceilings—weighing in at about 60 pounds each—so if you hire a pro, they may charge a little more for labor. You should also factor in paint costs for a drywall ceiling. The least expensive drywall ceiling option is the standard, smooth variety.

A utility knife is sharp enough to score the drywall and it may work in a pinch for outlet box holes. However, one of the best tools for drywall when you need to make exact cuts for an outlet box quickly is a drywall saw. This handheld tool has a longer blade than a utility knife, so it penetrates the thickness of the drywall easily. The design of its handle and the teeth in its blade make it easier to control while cutting quicker than you can with a utility knife.

You shouldn’t leave drywall outside overnight, especially if you live in a wet or humid climate. The moisture from humidity, rain, or other elements can damage the drywall, making it weaker and susceptible to mold growth. Stash any extra drywall in a dry area away from the elements to protect it from moisture.