How to Build a Two Car Garage With a Workshop

Written by dan aragon
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How to Build a Two Car Garage With a Workshop
Two Car Attached Garage (new house image by Shannon Workman from

The idea of having a garage to park a new car and even a large space inside that garage as a workshop is a dream for some people which can become reality with the right plan. Building this structure yourself is not that complicated or difficult with help of a few good friends, some time and of course money for materials and tools.

Skill level:

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Things you need

  • Design plan
  • Building permit
  • Building materials
  • Tools and equipment

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    Site Selection and Design

  1. 1

    Plan the site of your structure by first determining the boundaries of your property. This step can be skipped if your property is sufficiently big enough not to involve property boundary disputes with neighbours. Most regional building codes in the United States require new buildings to be placed several feet away from property boundaries and your building plan will have to contain a drawing of your building in relation to the property boundary lines.

    How to Build a Two Car Garage With a Workshop
    (building site image by Pierrette Guertin from
  2. 2

    Develop an adequate access route to your building site to allow for materials to be delivered safely and efficiently. This access route will eventually become your driveway and should be part of the building plan. Crushed rock road base material is inexpensive and can be maintained easily.

  3. 3

    Design and develop the size of your garage to park two large SUV's with an additional area for a work shop. A common size for a two car garage is twenty-six feet wide and twenty-four feet deep. Many higher-end garages are designed for more space and a work shop area. Thirty feet wide by forty feet deep is an ideal size for this purpose.

  4. 4

    Design and develop your garage on paper by first sketching out your desired architectural look with sketches of the overall building and sketches of each side of the building that show window and door locations and placements. Hand sketches that show site location and overall dimensions will be enough to obtain a building permit but you should consider purchasing a set of building plans developed by a professional.


  1. 1

    Excavate the ground area to ensure a flat and level work site with access to all sides of the building. If you are going to have any of the work contracted out to professionals this is by far the best choice. The size of this building will require a large amount of concrete for the floor and integrated footings and foundation.

    How to Build a Two Car Garage With a Workshop
    (Freshly Poured Cement on a Construction Site image by Empath from
  2. 2

    Frame the walls of your structure using two-by-four standard construction grade boards. The length of these boards will determine the height of your ceiling. Ten foot long wall studs will give you adequate clearance for most large vehicles and internal work areas. Be sure to properly measure and locate rough framed openings for all windows and doors to include horizontal support beams above the windows and doors called headers.

  3. 3

    Purchase professionally-designed and fabricated roof trusses. Roof trusses are a critical component in the structural integrity of your garage. Having a professional design roof trusses is both cost effective and safer than building your own, plus they usually will deliver them directly to your building site. Install the roof trusses according to design by using steel straps to attach them to the tops of the walls.

  4. 4

    Nail four-by-eight foot sheets of oriented strand board (OSB) to the outside walls and roof of your building. Place these sheets of OSB over window and door openings and then cut out the excess material for the openings from the inside.

  5. 5

    Install roofing material on the surface of the OSB roof structure by first stapling tar paper on the entire surface and then nailing down your choice of asphalt shingles to match your house.

    Work for the Professionals

  1. 1

    Install windows and doors. Your design should include at least one thirty six inch wide personal entrance door and preferably two nine foot wide single garage doors. Installing standard windows and doors is rather easy with the new options available but garage doors are best to be installed by professionals.

  2. 2

    Hire a licensed electrician to design and install an adequate system of lights and power outlets for all of your equipment requirements. This would include power for garage door openers.

  3. 3

    Install siding, stucco or brick with matching trim on your new garage to match your house and finish this with matching paint colours. This may seem like a simple last step but you can save a lot of time by hiring a professional to complete this part of the construction.

Tips and warnings

  • Much of this job can be done by the homeowner but contracting the parts of the job that require special equipment will actually save time and money.
  • Be sure to schedule building permit inspections for each phase of the construction process.
  • Inspections aill be dictated by your local building authority.

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