How to Build a 24 Foot by 30 Foot Garage

An owner-built garage can be constructed in a few focused days. A 24 by 30 foot garage is large enough to provide the homeowner with space for vehicles, personal projects and storage. With the proper building permits, tools and safety precautions, your DIY garage will stand up to those built by professional builders.

Things You'll Need

  • Tools (circular saw, miter saw, cordless or electric screw gun, hammer, level)
  • Ladder
  • Fasteners (screws in proper lengths, siding nails or screws, roofing nails)
  • Lumber
  • Trusses (pre-made if not using rafters)
  • Sheathing for walls and roof (OSB or plywood)
  • Siding
  • Roofing material
  • Windows
  • Doors
  • Concrete foundation contractor
  • Proper building permits

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Before Construction

Check your local codes and restrictions and secure the proper permits. Find out what is allowed in your neighborhood, town or county in regards to building a garage on your property.

Choose a site for the garage that is level, or close to level. Since the dimensions of the garage will be 24 by 30 feet, you will need a site a bit larger than that, to accommodate the space.

Make a materials list. Purchase lumber and materials for sill plates, top plates, studs, trusses or rafters, sheathing (for roof and walls - can be OSB or plywood), roofing material, siding material, header material, windows, doors, fasteners, and trim (corner trim, soffit and fascia).

Begin Construction

Choose and prepare the foundation. There are three types of foundations to choose from: Poured slab, masonry or block wall or poured concrete wall. The foundation must be done by a licensed contractor. The foundation contractor will leave the proper system of bolts in place to attach the wooden walls to the concrete foundation.

Lay out and construct walls. Studs should be 16 inches on center. Frame openings for doors and windows.

Erect, plumb and brace walls. After constructing the walls, stand them up into position, then use a level to check for plumb.

Sheathe walls. Use OSB (Oriented Strand Board) or plywood for sheathing. Attach to studs using screws.

Sheathe roof. OSB or plywood will also be used for sheathing on the roof. Attach to trusses or rafters using screws.

Attach roofing material. The most common choices for roofing material are rolled-roofing, sheets of metal roofing or asphalt shingles. Use metal roofing screws or roofing nails according to the type of roofing.

Install doors and windows.Cut opening for windows and doors in siding sheathing.

Install siding on exterior walls. Common choices of siding are vinyl or aluminum siding, metal (or pole barn) siding, or exterior paneling.

Finish garage with appropriate trim. Put on trim pieces such as corner trim, soffit and fascia.

Tips & Warnings

  • Decide ahead of time what type of roofing and siding you want for your garage. Ask for help from a friend or two - especially with building the walls and installing the trusses or rafters. Building a garage is usually left to a professional, but it can be done by a homeowner with a little know-how and a desire to learn.
  • This is not a project for a novice in construction and home improvement, but it can be achieved by carefully following a logical, step-by-step process. Always practice proper safety procedures when using power tools (wear safety goggles, use a spotter when climbing a ladder). Make sure you have the proper permits to build your garage or you could face expensive fines.
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