Installing a fire-rated separation between a house and garage typically costs $700-$2,500 for a modest retrofit, with larger or more complicated projects costing more. The price to install a firewall between a house and garage depends on wall area, drywall type, door requirements, existing conditions, and local code.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Garage-house wall retrofit | $700 | $1,400 | $2,500 | Typical 150-250 sq ft wall |
| Drywall installation | $1.50/sq ft | $2.75/sq ft | $5/sq ft | Labor and board; finish level affects price |
| Fire-rated door installed | $400 | $800 | $1,500 | Door, frame, hardware, and fitting |
| Inspection or permit | $0 | $150 | $500 | Depends on local rules and project scope |
Assumptions: U.S. mid-market labor, normal access, and a small-to-medium attached garage.
Typical price for a 150- to 250-square-foot garage wall
A straightforward retrofit that adds approved gypsum board to an existing shared wall commonly totals $700-$1,800. Repairs to framing, insulation, wiring penetrations, or an undersized door can raise the job to $2,500 or more. A new wall built from framing through finish may cost $1,500-$4,000, depending on length and ceiling height.
For a typical existing wall, budget about $1,400 before unusual repairs or door replacement. This estimate assumes a sound frame, standard-height wall, one layer of code-compliant board, and no extensive electrical relocation. Contractors may quote by square foot, by wall, or as a minimum service charge.
What drywall, labor, and door work add to the quote
Quotes vary with board thickness, finish, access, and whether the job includes the door opening. The table separates common charges; not every project needs each item.
| Quote item | Typical price | Pricing basis | What changes it |
|---|---|---|---|
| Gypsum board and fasteners | $0.50-$1.25 | Per sq ft | Type X board or multiple layers |
| Hanging, taping, and finishing | $1-$3.75 | Per sq ft | Finish level and overhead work |
| Door and fitting | $400-$1,500 | Per opening | Rated assembly, frame, closer, and trim |
| Sealing gaps and penetrations | $100-$500 | Per project | Number and size of openings |
| Removal and disposal | $150-$600 | Per project | Existing finish and debris volume |
Labor is often the largest variable after door work. A labor estimate can be checked with ; rates commonly fall around $50-$100 per hour, though drywall crews may price by area instead.
How wall height, board type, and door size change the price
Area is a direct cost driver: a 20-foot-long, 8-foot-high wall has 160 square feet, while a 24-foot wall at 9 feet high has 216 square feet before openings are deducted. Added height can also require staging or more difficult overhead finishing. A second board layer may add roughly $1-$3 per square foot installed.
Code requirements depend on the adopted local building code and the construction above the garage. Common provisions call for at least 1/2-inch gypsum board on the garage side of a shared wall; ceilings below habitable rooms may require 5/8-inch Type X board. Door assembly, penetrations, and existing construction also matter, so the local building department should confirm the required specification.
Do not assume that any labeled “fire-rated” board makes the whole separation compliant. The wall assembly, joints, openings, and door must meet applicable local requirements. An opening wider than a standard 32- to 36-inch door or a ceiling connection can require additional work.
Which scope choices keep a garage separation affordable
Ask contractors to price the required wall work separately from optional finish upgrades. If existing framing and board are sound and compliant, targeted repairs may cost less than covering or rebuilding the entire wall. Avoid paying for a premium smooth finish in a garage when a basic taped finish is acceptable for the planned use.
Confirm the required assembly before buying materials or authorizing demolition. Get at least two itemized quotes that identify board thickness, number of layers, door work, sealing, disposal, and permit fees. Combining the wall and door work in one visit can reduce minimum labor charges, but only when both scopes are ready.
How long installers need for drywall and door work
A simple one-wall installation may take a two-person crew 1-2 days for hanging, then additional visits for taping and drying. A door replacement or framing repairs can extend the schedule. Contractors may charge a $150-$350 minimum for small repairs, even when the measured area is limited.
For a 180-square-foot wall, 12-20 labor hours at $50-$100 per hour implies $600-$2,000 in labor before materials, disposal, or door costs. Access, finish drying time, and moving stored items can matter as much as the wall dimensions.
When permits and existing damage increase the bill
Some jurisdictions require a permit or inspection when a wall or door is altered, while minor finish work may not. Permit and inspection charges often run $50-$500. Older homes may have uncovered wiring, gaps around pipes, damaged framing, or an existing door that does not meet current local requirements.
Repairing small penetrations and sealing compatible materials may add $100-$500. Extensive framing repair or electrical work can add several hundred dollars or more. Have the contractor identify concealed-condition charges in writing before work starts.
Three sample quotes for common garage-wall projects
| Project | Scope | Estimated total |
|---|---|---|
| Small repair | 80 sq ft board replacement, 6 labor hours, no door | $450-$900 |
| Typical retrofit | 180 sq ft board, 14 labor hours, gap sealing | $1,000-$2,000 |
| Wall and door update | 240 sq ft board, 20 labor hours, new door assembly | $1,800-$3,800 |
Estimates assume standard access and no major framing or electrical changes; finish level and local labor rates affect totals.
These examples show why a door replacement can shift a quote more than a small difference in wall area. A written estimate should specify whether the total includes materials, finishing, disposal, tax, and inspection fees.
Why garage firewall prices differ by U.S. location
Contractor labor and permit costs vary by market. Large coastal cities may run 15%-35% above national mid-market estimates, while rural areas can be 5%-20% lower when contractors are nearby. Rural travel charges or limited contractor availability can erase that difference, especially for a small job.
Compare quotes from contractors familiar with the local code rather than relying on a national per-square-foot figure alone. A low quote may omit the required door assembly, ceiling protection, or sealing around penetrations.