Insulating a two-car garage costs about $2,000 to $6,500 in 2026, depending on the insulation type and whether you add drywall. Enter your garage size and choices below to see a full breakdown and compare batts, foam board and spray foam.
Garage Insulation Cost Calculator
Cost breakdown
| Item | Cost |
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| Total | $0 |
Compare insulation types
| Wall insulation | Total | Wall R-value |
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How Much Does It Cost to Insulate a Garage in 2026?
Insulating a two-car garage typically costs $2,000 to $6,500 professionally installed. A 24 x 24 attached garage with fiberglass batts in the walls and ceiling plus a garage door kit costs about $2,550, while closed-cell spray foam runs about $6,450. Covering the insulation with drywall and paint adds about $3,000 to $4,500. Doing it yourself with batts costs about $1,050 in materials.
| Insulation type | 1-car (12 x 22) | 2-car (24 x 24) | 3-car (36 x 24) |
|---|---|---|---|
| Fiberglass batts | About $1,860 | About $2,550 | About $3,490 |
| Mineral wool batts | About $2,390 | About $3,190 | About $4,180 |
| Rigid foam board | About $2,610 | About $3,460 | About $4,470 |
| Open-cell spray foam | About $3,080 | About $4,560 | About $6,170 |
| Closed-cell spray foam | About $4,260 | About $6,460 | About $8,660 |
| Batts plus drywall and paint | About $4,680 | About $7,000 | About $9,270 |
| DIY batts (materials only) | About $700 | About $1,050 | About $1,360 |
Garage Insulation Cost by Type
| Type | Installed cost per sq ft | Typical R-value | Best for |
|---|---|---|---|
| Fiberglass batts | About $1.30 to $1.40 | R-13 to R-15 walls, R-30 ceiling | Open stud walls on a budget |
| Mineral wool batts | About $2.60 | R-15 | Fire and moisture resistance, soundproofing |
| Blown-in cellulose or fiberglass | About $1.90 | R-38 ceiling | Attic space above the garage |
| Rigid foam board | About $3.10 | R-10 to R-15 | Block walls and garage doors |
| Open-cell spray foam | About $2.90 to $3.40 | R-13 walls, R-21 ceiling | Air sealing and sound control |
| Closed-cell spray foam | About $4.50 to $5.20 | R-21 walls, R-35 ceiling | Heated shops, cold climates, moisture |
Fiberglass batts are the cheapest and the easiest DIY option for open stud walls. Spray foam costs two to three times as much but also seals air leaks, which matters most in a heated garage or one with a room above. If your walls are already drywalled, an installer can drill small holes and blow insulation into each stud bay for about $2.60 per square foot, plus patching.
Garage Door Insulation Cost
An uninsulated garage door is often the biggest source of heat loss in the garage. A DIY foam or reflective garage door insulation kit costs about $120 for a single door and $220 for a double door. Professional installation runs about $500 to $650 per door. New weatherstripping and a bottom seal add about $150 and stop most drafts. If your door is old or damaged, a new insulated door may be the better buy. Compare prices with our garage door cost calculator.
What Else Affects the Cost?
- Drywall: Codes usually require exposed foam and kraft-faced batts to be covered. Drywall costs about $2.75 per square foot hung and finished, plus about $1.25 to prime and paint.
- Attached vs. detached: In an attached garage, the wall and ceiling shared with the house matter most. A detached garage has four exterior walls to insulate.
- Removing old insulation: Wet, moldy or rodent-damaged insulation costs about $1 per square foot to remove.
- Air sealing: Sealing gaps around outlets, the rim joist and the house wall costs about $300 and makes any insulation work better.
DIY vs. Professional Garage Insulation
Fiberglass or mineral wool batts, foam board and garage door kits are manageable DIY projects that cut the cost by half or more. Wear a respirator, goggles and long sleeves, and install kraft-faced batts with the paper facing the heated side. Spray foam and blown-in insulation need professional equipment. For more ways to save, read the cheapest way to insulate your garage and what actually works for cheap garage insulation.
Get Quotes from Local Insulation Pros
Ask each installer for the R-value and square footage they’ll install in the walls, ceiling and door, and whether air sealing, cleanup and drywall are included. Comparing the R-value per dollar makes quotes easier to compare.
Is Insulating a Garage Worth It?
For an attached garage, usually yes. Insulation keeps the rooms next to and above the garage more comfortable and can lower heating and cooling bills. It’s essential if you plan to heat the garage or use it as a gym, workshop or office, and it lets you buy a smaller heater. See how much with our garage heater size calculator. Planning a bigger project? See our garage conversion cost calculator, and if you’re adding an EV charger at the same time, our EV charger installation cost calculator.
Frequently Asked Questions
How much does it cost to insulate a 2-car garage?
About $2,500 for fiberglass batts in the walls and ceiling plus a garage door kit, installed in a typical 24 x 24 attached garage. Spray foam costs $4,500 to $6,500, and adding drywall and paint brings a batt job to about $7,000.
How much does garage door insulation cost?
A DIY kit costs about $120 for a single door and $220 for a double door. Professional installation costs about $500 to $650 per door. Shop garage door insulation kits here.
What R-value should garage insulation be?
R-13 to R-15 is standard for 2×4 garage walls and R-30 to R-38 for the ceiling. Heated garages in cold climates benefit from R-19 or more in the walls and R-49 in the ceiling.
Do I need to drywall over garage insulation?
Usually, yes. Most building codes require foam insulation and kraft-faced batts to be covered with drywall or another fire-rated barrier, and attached garages need fire-rated drywall on the wall and ceiling shared with the house.
Can I insulate a garage myself?
Yes, with batts, foam board or a garage door kit. A DIY batt job on a two-car garage costs about $1,050 in materials. Spray foam and blown-in insulation are best left to professionals.
Pricing last updated October 2026 using national-average installed costs. Prices vary by region, installer and garage; always get written quotes.
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