Garage Addition Cost Estimates

Garage Addition Costs per Square Foot and Design Considerations

By Mark J. Donovan

Building a garage addition onto your home has many benefits. Not only does it make your life easier, it protects your vehicles, and it provides ideal storage space for lawn and garden items during winter months. A garage addition also helps make your home more marketable when you plan to sell it someday. In addition, the typical garage addition has a return on investment rating of over 80%. Garage addition cost estimates will vary depending upon the size of the garage addition, how much you finish the interior of it, and contractor labor rate market conditions.

For a large 2 car garage addition (e.g. 26’x26’), that is unfinished on the inside, expect to see garage addition cost estimates from contractors range from $30K-$60K. This translates into a cost per square foot range of $44 to $89 for building a garage addition.

From personal experience I can unequivocally say that adding a garage addition onto my home was one of the best decisions I ever made. Living in the northeast where the winters are notoriously cold and snowy I was fed up with having to go out every winter morning to warm up my car and scrape the ice and snow off of my car. It also provided me with a nice little workshop and a place to store the kids’ bikes and my lawnmower.

Building a garage addition onto your home is a major construction project and is consequently not a DIY project for most homeowners. Building a garage addition is akin to building a small home. It’s also complicated a bit more in the fact that the garage addition has to tie in structurally and aesthetically into the existing home. Therefore, I highly recommend hiring a general contractor to orchestrate the construction of your garage addition.

Garage addition cost estimates from general contractors will comprise of an entire host of construction activities and materials.

Garage Addition Bid Sheet
  • Garage addition cost estimates should include breakout line items for the following:
  • Excavation and Foundation site work
  • Foundation and concrete slab pouring
  • Framing and sheathing
  • Electrical Wiring
  • Roof shingling
  • House siding and Exterior Trim
  • Window and door installation
  • Garage door installation, costing anywhere from $700 to $2,000 per door
  • Garage door opener installation
  • Exterior painting
Other Garage Addition Cost Estimate Considerations

If you want to finish the interior garage addition so that it is warmer and more aesthetically appealing, you’ll also need to include in your garage addition cost estimates the following:

  • Wall and ceiling Insulation
  • Drywall installation
  • Interior trim molding installation
  • Heating
  • Finished garage flooring
  • Interior painting
 attached garage addition

For more information on building a garage addition see the Garage Addition Bid Sheet from The Garage Addition Bid Sheet includes an extensive questionnaire (Request for Quote) that a homeowner can provide to prospective general contractors and subcontractors for bidding the garage addition. In addition, the Garage Addition Bid Sheet also includes estimated costs and time intervals for constructing a garage addition as well as a list of key home material manufacturers. Finally, the Garage Addition Bid sheet includes an extensive set of helpful tips and advice on making sure the garage addition is built properly and on time and budget.

Related Information

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