Prefab garage kits cost about $5,000-$30,000 for the kit alone, with size, materials, doors, and roof design driving the price. A complete installed garage commonly totals $20,000-$55,000 after foundation work, delivery, labor, and permits.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| One-car kit | $5,000 | $8,500 | $15,000 | Commonly 12×20 ft; kit materials only |
| Two-car kit | $9,000 | $16,000 | $30,000 | Often 24×24 ft; options affect price |
| Installed garage | $20,000 | $35,000 | $55,000 | Includes typical site work and assembly |
| Concrete slab | $6-$10 per sq ft | $8 per sq ft | $12 per sq ft | Excavation or reinforcement may add cost |
What a 12×20 or 24×24 prefab garage kit costs
A basic 12×20-foot, one-car wood or metal kit generally costs $5,000-$10,000, while a 24×24-foot, two-car kit often runs $9,000-$20,000. Three-car and oversized kits can reach $30,000 or more before installation. Prices typically cover the structural package, not a finished, ready-to-use garage.
For a standard two-car garage, budgeting roughly $16,000 for the kit and $35,000 for a basic installed project is a practical starting point. These estimates assume standard materials, ordinary access, and no major electrical or interior finishing. Assumptions: typical U.S. pricing, standard doors, level site, and no unusual code upgrades.
How slab, framing, delivery, and assembly shape the quote
Kit quotes differ in what they include. A lower advertised price may exclude freight, fasteners, windows, doors, or engineered drawings. The table shows common costs for a 24×24-foot garage; local site conditions and specifications can move these amounts.
| Quote component | Typical cost | What changes the price | Common unit |
|---|---|---|---|
| Kit materials | $9,000-$20,000 | Steel versus wood, roof, doors | $16-$35 per sq ft |
| Concrete slab | $4,600-$6,900 | Thickness, grading, reinforcement | $8-$12 per sq ft |
| Assembly labor | $3,000-$8,000 | Crew size, kit complexity | $50-$100 per labor hour |
| Delivery and equipment | $500-$2,500 | Distance, unloading, crane needs | $4-$10 per loaded mile |
| Permits and plans | $300-$2,000 | Local review and engineering | $300-$2,000 per project |
Confirm whether the written quote includes the slab, freight, doors, and assembly before comparing kit prices. Electrical wiring, insulation, gutters, and interior drywall may be separate line items.
Which garage dimensions and materials raise the kit price
Size has a direct effect: increasing a garage from 12×20 feet to 24×24 feet more than doubles floor area, and larger spans may need heavier framing. A 30×40-foot workshop kit can cost $20,000-$45,000 before foundation and construction. Steel kits may cost less than comparable wood packages, but thicker-gauge steel, upgraded coatings, and insulation raise the total.
Roof and door specifications can shift a quote by thousands. A steep roof, snow-load rating above 30 pounds per square foot, or wind rating for exposed areas may require stronger components. A basic single overhead door may be included, while insulated or oversized doors can add $800-$2,500 each. Windows, a side entry door, and a loft also add costs.
How much assembly labor adds to a prefab garage
Professional assembly often adds $3,000-$8,000 for a standard two-car kit, depending on crew rates and complexity. A small, straightforward kit may take a few days; larger buildings, challenging access, or extensive roof framing can require a week or more. Labor rates commonly fall around $50-$100 per hour per worker, with regional variation.
Assembly labor is not the same as a turnkey installation. The contractor may charge separately for excavation, slab placement, equipment rental, and electrical work. A 60-hour crew labor allowance at $75 per hour equals $4,500, before machinery or subcontractors.
Three realistic prefab garage quotes by project size
The examples below show how kit price and site work combine. They assume ordinary access and no major utility extension, retaining wall, or interior finish.
| Project | Kit | Other work | Estimated total |
|---|---|---|---|
| 12×20 ft metal, one car | $6,500 | $5,000 slab, $3,000 assembly, $800 delivery and permit | $15,300 |
| 24×24 ft wood, two cars | $15,000 | $5,200 slab, $5,000 assembly, $1,500 delivery and permits | $26,700 |
| 30×40 ft insulated workshop | $32,000 | $10,000 foundation, $9,000 assembly, $3,000 delivery and permits | $54,000 |
These totals are planning examples, not fixed national prices. Compare bids using the same footprint, door package, snow and wind ratings, slab scope, and finish level.
Prefab garage prices across rural, suburban, and metro areas
Urban and high-cost coastal markets may run 15%-30% above national midpoint estimates because of labor rates, permitting, and delivery constraints. Rural areas may be 5%-15% less for labor, but remote delivery or limited contractor availability can erase the savings. Suburban projects often land near the middle, unless access is tight or local design requirements call for upgraded engineering.
Freight distance and local construction rates matter as much as the kit’s advertised price. Ask suppliers whether delivery is a flat charge or mileage-based, and check whether the site needs a crane or forklift. Permit charges also vary: some jurisdictions use a modest flat fee, while others calculate fees based on project value or floor area.
Where homeowners can cut the installed garage price
Choosing a standard footprint and roof design can avoid custom engineering and special-order framing. A 24×24-foot model may be cheaper per square foot than a custom 23×27-foot layout, even if the total price is higher. Keep add-ons such as windows, insulation, and premium doors tied to actual use rather than selecting every available upgrade.
Get itemized quotes for the kit, slab, delivery, assembly, and permits, then compare matching specifications. Clearing brush, confirming truck access, and arranging a level building pad can reduce site charges, but excavation and concrete work should meet local code. Scheduling outside peak contractor periods may help with availability, though weather and supplier lead times can affect timing.