A prefab detached garage typically costs $8,000-$45,000 installed, with a common project averaging about $23,000 before unusual site work or premium finishes. Size, foundation, local labor, delivery distance, doors, and electrical work account for much of the price difference.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Prefab one-car garage | $8,000 | $13,000 | $21,000 | About 12 by 20 ft; basic package and installation |
| Prefab two-car garage | $16,000 | $25,000 | $40,000 | About 24 by 24 ft; standard doors and siding |
| Large garage or workshop | $28,000 | $43,000 | $70,000 | About 30 by 40 ft; higher specs or substantial site work |
| Concrete foundation | $6 | $9 | $14 | Per sq ft; excavation and reinforcement affect rate |
| Delivery and assembly | $2,000 | $5,000 | $10,000 | Varies with distance, access, and garage size |
What a 1-car or 2-car prefab garage usually costs
For a basic, enclosed prefab detached garage, buyers often pay $8,000-$21,000 for a one-car building and $16,000-$40,000 for a two-car building. The lower end generally assumes a simple design, standard siding, an accessible site, and a package that includes assembly but not every foundation or utility expense. Higher quotes may include stronger framing, upgraded doors, a concrete slab, or a longer delivery route.
A typical 12-by-20-foot garage provides 240 square feet and may cost $33-$88 per square foot installed. A 24-by-24-foot model provides 576 square feet and commonly runs $28-$69 per square foot. Larger buildings can have a lower shell cost per square foot, but total costs rise as foundations, doors, roof area, and labor increase.
A practical planning budget is $13,000 for a basic one-car model and roughly $25,000 for a standard two-car garage. Those figures assume ordinary access and midrange materials in a moderate-cost market; they are not guaranteed turnkey prices. Assumptions: standard wood or metal package, ordinary delivery access, no major grading, and no extensive electrical or plumbing work.
How the garage package, slab, and labor shape the quote
Quotes can describe different scopes, so buyers should check whether the number covers only a delivered kit, an assembled shell, or a usable garage with foundation and permits. A package price may exclude site preparation, concrete, taxes, electrical service, and removal of an old structure. The following ranges help separate common line items for a 24-by-24-foot garage.
| Quote item | Low | Average | High | Typical scope |
|---|---|---|---|---|
| Materials | $8,000 | $13,000 | $21,000 | Framing or steel shell, roof, siding, basic trim |
| Labor | $3,000 | $6,000 | $11,000 | Assembly, framing, roofing, and finish work |
| Foundation | $3,500 | $5,500 | $8,500 | Prepared concrete slab, excluding difficult excavation |
| Permits and inspections | $200 | $900 | $2,500 | Local building permit and applicable reviews |
| Delivery and disposal | $500 | $1,800 | $4,000 | Freight, equipment access, packaging or old-shed removal |
Labor commonly works out to $50-$100 per worker-hour, although many installers bid by the project rather than by the hour. If the quote separates labor, ask whether it includes unloading, weatherproofing, trim, cleanup, and correction of assembly issues.
Compare the included work line by line, not just the advertised building price. A low kit quote can become more expensive than an installed package after foundation, delivery, and crew charges are added.
How width, roof load, and siding change prefab garage pricing
Size is the clearest cost driver. Moving from a 12-by-20-foot single-bay building to a 24-by-24-foot two-car garage more than doubles floor area, but the total may not double because some delivery and setup costs are shared. A 30-by-40-foot garage, often used for vehicles and a workshop, can reach $30,000-$70,000 installed, especially with a slab and upgraded structure.
Door openings also affect framing and price. A basic single overhead door may add $800-$2,000, while a wider or insulated door can cost $1,500-$4,000 installed. A second bay door, windows, personnel doors, and insulation add materials and installation time. Each added window may run about $250-$700 installed, depending on size and finish.
Material and climate specifications matter. Basic metal buildings often cost less than comparable wood-framed buildings, though insulation, condensation control, and finish requirements can narrow the difference. In areas with heavy snow or high wind, engineering for a roof load above roughly 30 pounds per square foot or wind ratings around 120 mph may add 5%-15% or more. A 6:12 roof pitch, heavier framing, or architectural shingles can also raise the package price.
Confirm the design load and local code requirements before comparing a low-cost package with an engineered building. A building that does not meet local snow, wind, or anchoring rules may require costly changes or fail permit review. Price ranges assume ordinary residential specifications; engineering upgrades depend on jurisdiction and exposure.
Regional delivery and installation rates across the United States
Regional pricing reflects installer availability, wage levels, freight distance, weather requirements, and local rules. A comparable garage may cost 10%-20% more in high-cost coastal metros than in many inland or rural markets. Remote locations can also pay more than cities when crews travel far or trucks face limited access, even when local wages are lower.
In the Midwest and South, a standard two-car project may fall near $18,000-$32,000 where the site is easy to reach and materials are common. In the Northeast and West Coast, similar scope may run $24,000-$42,000, especially near major cities. Rural buyers may find lower labor rates but incur a $500-$3,000 delivery or mobilization charge if the supplier is distant.
Climate can outweigh regional averages. High snow loads in northern states, hurricane wind provisions in coastal areas, and wildfire-related material rules in some western communities can require stronger construction or different siding. Local concrete prices and excavation conditions also vary considerably.
Request a quote that identifies freight mileage, local code upgrades, and foundation scope. Those details explain why two suppliers may price the same nominal building size differently.
How many days installation takes and what labor covers
A prepared, level site can allow a small prefab garage to be assembled in one to three days, while a two-car structure commonly takes two to five days. A large workshop, complex roof, or heavily customized package may take a week or longer. These estimates usually cover building assembly, not permitting, foundation curing, utility work, or extensive grading.
Site work may add one to five working days, and a poured slab often needs several days before it is ready for construction, subject to contractor instructions and weather. A compact crew may consist of two to four installers, with additional trades needed for concrete, electrical service, or a driveway connection. Scheduling can stretch over several weeks during peak building season.
Installer pricing may be a fixed amount, a per-square-foot rate, or a labor-hour charge. Assembly-only labor for a standard package can range from about $3,000-$8,000 for a two-car garage; complex designs and difficult access can exceed that range. Ask whether the crew is insured and whether the bid includes anchoring and final weatherproofing.
Get a written schedule that distinguishes assembly days from the full project timeline. That prevents a short installation estimate from being mistaken for a move-in-ready completion date.
Site preparation, permits, and add-ons that raise the total
Clearing brush, removing an old shed, excavating, and leveling can add $500-$5,000 or more. A sloped or wet site may require retaining work, drainage, or deeper excavation, potentially adding several thousand dollars. Concrete removal and haul-away often cost $3-$8 per square foot, depending on thickness and disposal access.
Many jurisdictions require a building permit for detached garages, with fees commonly between $100 and $2,000. Some also require zoning review, setback confirmation, engineered drawings, or electrical permits. Rules may depend on floor area, height, property location, and whether utilities are installed. A garage near a property line may need redesign even if the building package itself meets structural code.
Electrical work can add $1,000-$4,000 for basic lighting and outlets when the panel and trench route are nearby. A long underground run, subpanel, heat, plumbing, or a finished interior can add substantially more. Insulation may cost $1-$4 per square foot of wall and roof surface, while drywall and interior finishing can add $3-$8 per square foot of floor area depending on scope.
Price the land, code, and utility work before ordering the building. Suppliers usually cannot include those costs accurately without site dimensions, access information, and local requirements.
Prefab garage versus stick-built construction at the same size
A standard prefab garage is often less expensive and faster to assemble than a comparable stick-built building, particularly when the package uses repetitive dimensions and limited customization. A delivered and assembled prefab two-car garage may cost $16,000-$40,000 before major site or utility work. A custom stick-built version of similar size may run approximately $25,000-$55,000, with high regional labor rates or architectural details pushing it higher.
Prefab does not automatically mean a complete building. Some prices cover a kit only, leaving the homeowner to arrange a slab and assembly. Stick-built work may be easier to tailor to unusual setbacks, rooflines, or attached structures, but requires more on-site labor. A metal kit can be economical for storage, while wood framing may better match a house or support conventional exterior finishes.
Repairing an existing garage can be cheaper if the slab and framing remain sound. Roof replacement may cost $5,000-$12,000 for a typical detached garage; replacing a damaged overhead door may cost $800-$2,500 installed. Extensive rot, foundation movement, or structural damage can make replacement more predictable than repeated repairs.
Compare equivalent scope, including foundation, siding, doors, and installation, before choosing prefab or custom construction. Different quote boundaries can make a lower advertised prefab price look more favorable than the actual project cost.
Which choices can lower a prefab detached garage quote
Keeping the footprint to a standard size often avoids custom engineering and material waste. A 20-by-20-foot or 24-by-24-foot design may be easier to price than a nonstandard width. Limiting windows, decorative trim, extra doors, and roof complexity can also reduce the package cost without changing its basic storage function.
Choose the minimum structural specification allowed by local code, not a weaker one. Avoid paying for premium snow or wind ratings that are unnecessary for the site, but verify design requirements with the building department. Basic siding and roofing can lower initial cost; however, material durability and maintenance should be weighed against the savings.
Prepare the site before the installer arrives if the work is manageable and permitted. Clearing vegetation, confirming truck access, and marking utilities may reduce crew delays, but excavation and concrete should be handled by qualified contractors when grading, drainage, or reinforcement is involved. Combining delivery with nearby projects may help reduce freight charges if the supplier offers that arrangement.
Obtain at least three itemized estimates based on the same dimensions, door count, foundation type, and finish level. Ask whether taxes, permit support, unloading, anchoring, cleanup, and change orders are included. Schedule outside the busiest spring and summer periods when practical; availability may improve, though seasonal discounts are not guaranteed.
The most reliable savings come from controlling scope and comparing complete installed quotes. A cheaper kit is not a bargain if its exclusions add thousands of dollars after delivery.