Cost of Building a Detached Garage vs Attached Garage

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There are costs associated with building a detached garage that are different from those involved in constructing an attached one. Read on to learn more about some of the pricing involved when building a detached or attached garage.

Size Matters

When it comes down to price, the size of the garage is really one of the biggest factors. If you are building a detached garage for one car, the price per square foot can average out to around $40. If you decide to add an additional car to the garage, effectively doubling the space, the price can go as high as $70 a square foot.

The cost to build an attached garage is cheaper on average by around 10 percent. This can fluctuate depending on material cost at the time of building, your area, and the contractor (if any) that you are using.


If the price of an attached garage is figured in during the construction of the home, it's cheaper than if you decide to add it later. You not only have additional material costs to consider, but zoning as well. When your home was being built, the extra materials could have been factored in, and all you would have needed to pay for was labor. You would need extra materials and labor, which can range from $7,000 for materials, up to $40 per square foot for labor, and then added taxes and permits in the hundreds of dollars range.

Building a detached garage carries no additional costs outside of the normal expenses, which may wind up being less. This is due to the fact that the existing structure of the home does not have to be changed.


A garage.

It is the dream of many homeowners to have a garage they can work in as well as park their car. This comes at a premium. In this instance, building a detached garage may prove more expensive than an attached one. With an attached garage, the electricity is already present in the home and can be easily added to the garage. Building a detached garage with electricity can bump the cost of the garage up considerably, as you will need added permits around $100 as well as a certified electrician, which can cost $45 per hour. A professional's fee usually includes materials.

Contractor or Do-It-Yourself

A single-car attached garage is roughly 240 square feet. With basic materials, the cost would be an average of $8,500 — but this can jump up to $10,000 if you use superior products.

Building a detached garage can cost, on average, $1,500 more. If you add electrical and ventilation, the price jumps to $13,000 and $15,000, respectively. If you do this project yourself, the cost of materials is averaged out to about $4,000 regardless of whether you are building a detached garage or an attached one. Electric wiring would still be extra.