Drywall Repair Cost After a Roof Leak

Drywall Material and Labor Costs

The material cost of drywall itself is modest. A standard 4-by-8-foot sheet of half-inch drywall costs $12 to $20 at retail. Moisture-resistant drywall (green board or purple board), which is recommended for areas prone to repeated moisture exposure, costs $14 to $25 per sheet. Mold-resistant drywall with fiberglass facing costs $20 to $30 per sheet and is worth the premium in areas adjacent to previous roof leak damage.

Labor is where the cost adds up. Drywall repair involves multiple steps: cutting out the damaged section, inspecting the cavity behind it, installing backing if needed (for patches that do not span from joist to joist), fitting and fastening the new piece, applying mesh tape or paper tape to the seams, applying three coats of joint compound with drying and sanding between each, priming, and painting. A skilled drywall contractor charges $45 to $85 per hour, and even a small patch requires two to three visits (installation, first mud coat, final finishing) spread over several days to allow drying time.

Ceiling work costs 20 to 30 percent more than wall work for the same area because of the physical demands of working overhead. The contractor needs to hold sheets above their head during installation, apply compound at an uncomfortable angle, and sand overhead, which generates more dust and requires more protective equipment. For large ceiling sections, scaffolding may be needed, adding $150 to $300 to the project.

Cost by Repair Size

Small patch, under 4 square feet: $300 to $600. This is the most common repair for a roof leak that was caught early and produced a single stain or soft spot on the ceiling. The damaged area is cut out in a rectangular shape, new drywall is cut to fit, backed with wood strips or clips, fastened, taped, mudded, sanded, primed, and painted. Two contractor visits are typical: one for installation and first coat, one for finishing and paint.

Medium section, 4 to 32 square feet: $600 to $1,500. When the damage covers a larger area, one to four sheets of drywall are involved. The scope increases proportionally: more material, more taping, more finishing. If the damage extends across a room in multiple disconnected areas, the contractor may need to work in several locations, adding time and cost. This size of repair typically takes three to four visits over a week.

Full ceiling, one room: $1,000 to $3,000. For a standard bedroom (10 by 12 feet, roughly 120 square feet of ceiling), full tear-out and replacement runs $1,000 to $2,000. For a larger living room or master bedroom (15 by 20 feet, 300 square feet), the cost is $1,800 to $3,000. Full ceiling replacement makes sense when the damage covers more than a third of the ceiling, when matching existing texture on patches is impractical, or when the homeowner wants to change from a textured to a smooth ceiling.

Wall section, per wall: $300 to $2,000. Wall drywall repair costs overlap with ceiling repair but are slightly less per square foot because of easier access. A single wall section (one 4-by-8-foot sheet) costs $300 to $700. Multiple wall sections in the same room cost $700 to $2,000. If the damage runs from ceiling to floor in a wall cavity, the full wall face may need replacement, which for a standard 10-foot wall is $600 to $1,200.

Finishing Costs: Texture and Paint

The finishing step is where amateur repairs become obvious and professional repairs blend invisibly. Matching an existing ceiling or wall finish requires skill and experience, and the finishing labor often exceeds the installation labor in cost.

Smooth finish. Three coats of joint compound, with sanding between each coat, followed by primer and two coats of paint. This is the simplest finish to match and the least expensive. The finishing portion adds $100 to $300 to a patch repair.

Knockdown texture. After the joint compound is smooth, texture compound is sprayed or rolled on and then partially flattened with a knockdown knife. Matching existing knockdown requires calibrating the spray pattern, droplet size, and knockdown timing to mimic the original application. A texture matching fee of $200 to $400 is common.

Orange peel texture. Similar to knockdown but without the flattening step, leaving a fine bumpy surface. Matching orange peel is somewhat easier than knockdown because there is no directional pattern to replicate. Texture matching adds $150 to $300.

Popcorn texture. Popcorn texture is the most difficult to patch invisibly because the original texture was typically applied to the entire ceiling at once with a consistent pattern. Spray-on popcorn repair products exist, but blending a patch with decades-old popcorn is rarely seamless. Many homeowners use the opportunity to remove the popcorn entirely and switch to a smooth or knockdown finish, which costs $1 to $2 per square foot for removal plus the cost of the new finish.

Paint matching. New paint over a patch often looks different from the surrounding aged paint, even if the color formula is identical. This is because paint fades and yellows over time, especially on ceilings exposed to cooking fumes and cigarette smoke. If the patch is noticeable after painting, the entire ceiling or wall needs to be repainted to achieve a uniform appearance. Full room painting adds $300 to $800 to the project.

Hidden Costs Behind the Drywall

Drywall repair after a roof leak frequently reveals additional damage that increases the total cost.

Wet insulation replacement: $100 to $800. Insulation behind the damaged drywall is almost certainly wet and needs to come out. The insulation replacement is done during the drywall work since the cavity is already open.

Mold remediation: $500 to $3,000. Mold on the backside of the removed drywall, on the framing, or in the insulation requires treatment before new drywall is installed. The remediation process adds time and cost but must be completed to prevent mold from growing on the new drywall.

Framing repair: $200 to $500 per member. Joists or studs that have developed rot need to be sistered or replaced. This structural work happens after drywall removal and before new installation.

Electrical relocation: $200 to $500. If the damaged drywall section includes an outlet, switch, or fixture box, the electrician needs to reconnect or relocate the device during the drywall replacement. Water-damaged electrical devices should be replaced rather than reused.