30x40 Garage. Premium metal kit garages

A 30' x 40' garage offers a generous 1,200 sq ft of usable, clearspan floorspace that will comfortably shelter 3-4 cars and still provide plenty of workspace. Or, for storage purposes, you could squeeze in up to 6 cars (depending on door configuration).

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Detached 30 x 40 Three Car Garage

1,200 sq. ft.
1-6 Cars
Solid Steel
Made in USA

Garage features

Start your project by customizing the base 30x40 metal building kit package to create a garage that meets your needs for access and functionality.

You get exactly the garage you need by specifying height, roof style and pitch, exterior finishes, color, door and window sizes, and types.

By configuring these options, you can create a garage that meets your storage or workshop needs and complements your existing structures.

  • What's Included

    Garage packages include:

    • Steel I-Beam framing
    • Steel roof & wall panels (26ga)
    • Complete trim package
    • Two framed door openings
    • Foundation anchor bolt plans
    • Engineer stamped plans
    • Building kit delivery
    • Installation instructions
    • All bolts, flashing & sealants

    Framing for Pre-Engineered Garage Steel Building
    I-beam steel framing
  • Features

    Benefit from:

    • Bolt-up construction
    • Trussless roof design
    • Clearspan widths to 300'
    • Certified to 160 MPH wind
    • Certified to 110 PSF snow
    • 30+ year warranty
    • Fast, free delivery
    • Fast build & times

  • Customization

    Custom options:

    Doors & windows - Choose sectional overhead, rollup, sliding or bifold door options and any window type and size.

    Roof profile & pitch - Adjust the gable roof pitch or select a single-slope, gambrel, or monitor profile

    Insulation - Opt for vinyl-faced fiberglass, spray foam, or insulated metal panels (IMPs).

    Structural upgrades - Add porches, overhangs, a carport lean-to, or a mezzanine for loft storage.

    Colors - Mix & match siding, roof, trim, and wainscot color options for a custom look.

    Siding - Switch out the standard metal cladding for cinder block, stucco, Hardie board, or brick veneer.

  • Exclusions

    Items not included:

    • Permits
    • Foundation
    • Installation
    • Insulation
    • Interior build out

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Similar garage sizes

30' x 50' Garage (4 to 9 car)

With our 30' x 50' garages, you get 1,500 sq ft of usable, clear-span space that can be configured as a 4-car garage with 500 sq ft of bonus space or adjust the layout for use as a drive through garage for boats, trailers or an RV. Or, for longer-term purposes, you can securely store up to nine vehicles. View our collection of custom designs.

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40' x 60' Garages (6 to 12 cars)

Our 40' x 60' garages are a versatile solution for oversized garaging. It offers 2,400 sq ft for a 6-car garage plus 900 sq ft for storage/workspace. Alternatively, it can store up to twelve regular-sized vehicles. You can also add a carport for extra covered parking or create office and bathroom space. Check out our sample designs and layouts.

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How much does it cost to build a 30' x 40' garage?

The average cost to install a 30' x 40' metal garage is $42,000 or $35 per square foot. This includes the kit package, foundation and construction. The final cost is based on your location (for code compliance) and the degree of customization.

For additional cost details, see our prices page.

Item Square Foot Cost
Building kit (shell) $15-$25
Foundation $5-$10
Construction $5-$10

Why choose a 30x40 metal garage?

Rigid-frame steel garages offer a durable, cost-efficient, and low-maintenance option compared to traditional wood-framed buildings.

Our kit buildings allow for a fully open floor plan, as they don't require internal support columns, giving you a 100% usable floor area. The design also incorporates a trussless roof, offering usable overhead clearance for additional storage, a workspace, or living quarters.

Also, due to the commercial-grade steel framing, the roof can be engineered to support additional weight, making it suitable for integrating a winch or crane, ideal for vehicle maintenance or other heavy-lifting tasks.

The precision-engineered components ensure seamless assembly, significantly reducing construction time. Bolt-together framing allows for quick installation, catering to both DIY enthusiasts and professional builders.

In contrast to the more basic tubular carport-style structures, 'Red Iron' steel buildings add value to your property.

Additionally, they are designed to comply with all local building codes and can be officially certified for occupancy, allowing you the option to add living quarters.


24x60x12 Custom Garage

24x60x12 Garage
Credit: Great Western Buildings

Garage installation

Here's a quick summary of the project procedure. For more information, refer to our detailed guide on planning, designing, and constructing a garage.

Site prep & foundation

Before delivering the building kit, you will need to arrange building permits and prep the building site. Once the site has been cleared and leveled, you will need to lay a concrete slab foundation. Most garages will only require a 4" slab, but if you plan on garaging large trucks, heavy equipment, or car lifts, then a 6" foundation will be required.

concrete foundation for detached garage

Installation / construction

Installation of our 30' x 40' garages is typically undertaken by a local professional steel erection company. Construction will take 2 to 3 days for a building of this size.

Alternatively, a DIY build is an option if you have previous construction experience and two or three handy friends. If you choose to go this route, please note that you will need to hire lifting equipment to raise the columns and roofing rafters.

If speed is important and you don't want to manage the project yourself, you can opt to hire a general contractor (GC) who will manage the project, hire subcontractors, and manage the entire project. Expect to pay around 20% of the project cost for GC fees.

garage installation


Once the building has been erected, you can add electrical and plumbing if necessary. You will also be ready to install insulation and add interior framing if a separate workshop and/or bathroom are needed.

insulation for garages

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Garage FAQ

  • How many cars fit in a 30 x 40 garage?

    A 30' x 40' steel building will comfortably shelter four cars or trucks. If you intend to use your garage daily, we recommend installing a door at each end for easy access. Alternatively, if it's for vehicle storage purposes, you could squeeze in 8 cars or 6 full-size SUVs.

  • Do metal buildings need a permit?

    Metal buildings often require a permit for installation. An exception would be for a new build on agricultural land outside city limits. The specific requirements for permits vary by location. For example, every metal building in Florida, including carports, garages, and workshops, typically requires a building permit. Similarly, most municipalities require building permits for metal buildings, as they help ensure the building is safe and up to code. It is advisable to contact the local zoning board or relevant authorities to understand the specific permit requirements for your area before proceeding with the installation. Additionally, obtaining engineered drawings and listing the contractor's name on the permit application are common requirements for permit approval.

  • How thick should a concrete slab be?

    Typical steel frame garages require a 4" floating foundation. If you are storing heavy commercial equipment or installing car lifts, then a 6" foundation will be needed.

  • What size door openings do I need?

    For cars and trucks you will need an 8x8 door as a minimum; consider adding a 10x8 to give you more room when backing in. If you need a double door this would need to be 16x8. For box trailers or boat storage, you will want to consider either 10' or 12' high doors to allow adequate clearance.

  • How much does it cost to wire a 30' x 40' garage?

    The cost to wire a garage ranges from $900 to $4,200, with detached garages generally costing more due to the need for a subpanel ($450 - $1,1000). GFCI outlet installation is priced at $140 to $250 each, complying with national electrical code (NEC) requirements. Electric car charging station setups cost between $650 and $2,400, including all necessary equipment and installation.

  • How do you insulate metal buildings?

    To insulate metal buildings, various methods can be used, such as foam board, batt insulation, spray foam, fiberglass batt insulation, and polyiso. The choice of insulation method depends on factors like cost, ease of installation, and effectiveness in reducing heat transfer and controlling temperature and moisture levels. The most common option for garages is poly-faced fiberglass insulation. When buying you can opt to purchase this from your chosen supplier or buy locally.

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