How much does it cost to build a 30x40 garage?

The variable at work here is the style of metal garage you plan to build. The design dictates the cost. A typical straight-wall style garage with a peaked roof is one of the two main options, a “P” model Quonset Hut being the other (for more, see: building styles). Think long, low domed building. Large ones were often used as aircraft hangers. A “P” model is an aesthetic extension of that ideal, with vertical sides and a peaked roof. Typically a Quonset garage doesn’t require a complete concrete foundation slab, as the walls can be set on narrow concrete footings instead, such is it’s stability. However, in a garage environment, this is not recommended, and a full slab should be used.

The cost for building a 30'x40' prefabricated steel garage depends in part on the design of the building and the extras that are involved. Variations in doors, windows and insulation will affect the total price. The cost of labor may also be a factor, though in many cases the owner of a prefabricated garage will eliminate labor costs by handing construction with a crew of friends.

The style of the garage, which can be either straight wall or Quonset (arched), will also have an impact on the cost. The cost for straight wall steel garages starts at about $9 per square ft. Taking the roof into account, the cost of a 30'x40' straight wall steel garage is about $10,800. Accessories and delivery will add another $3000 to this cost for a total estimate of $13,800. Quonset steel buildings are more economical and start at about $7.50 per square ft. The cost of a 30' x 40' Quonset steel garage begins at about $9,000. Accessories and delivery are an additional $2,500, bringing the total estimated cost to roughly $11,500. If a foundation is needed for a prefabricated steel garage, its cost will add another $4 to $8 per square foot.

In contrast, hiring a contractor to build a traditional (stick built) 30x40 garage can cost from $35 to $45 per square foot, for a total cost of $42,000 to $54,000. This equates to a saving of around $20,000!

These prices will vary considerably depending on location and labor. You should also budget for approximately $8-11 for construction, FREE if you self-build!

Estimate prices therefore can be broken down as follows:

Other popular garage sizes include: 12x14', 20x20', 22x22' & 24x24'

For more info see:

• Sample Straight Wall Steel Garages

• Sample Quonset Steel Garages