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Cost guide

Garage Conversion Cost in 2026

Converting a garage is one of the fastest ways to add usable space. Plumbing, permits and whether you are building an ADU drive the price.

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Step 1 of 4

Your garage

Size and future use.

Labor costs differ a lot by state. This adjusts every line.

sq ft

A one-car garage is about 200–250 sq ft. A two-car is 400–500.

180 sq ft900 sq ft

What will it become?

Estimated garage conversion cost

$41,600

$26,100 – $57,000

Want the line-by-line breakdown, with labor and materials split out for your state? Open the Garage Conversion Cost Calculator.

Garage conversion cost by use (400 sq ft)

ScenarioEstimated rangePer sq ft
Gym or playroomSimple finish, no heating or subfloor upgrade$16,400 – $36,600$41–$92
Home office$25,300 – $56,100$63–$140
BedroomInsulated subfloor and a mini-split$26,100 – $57,000$65–$143
Bedroom with a bathroom$35,900 – $86,500$90–$216
ADU (apartment)Kitchen, bath, separate entry and utilities$78,000 – $190,900$195–$477

Estimates at national-average pricing, calculated with our own pricing engine and reviewed September 2026. Change the inputs in the calculator to price your exact project.

What drives the cost

  • Adding plumbing (a bathroom or kitchen) usually costs more than the rest of the room.
  • An ADU adds separate utilities, fire separation and heavy permitting.
  • The old garage door opening must be framed, insulated and finished like a real wall.
  • Some cities require you to replace lost parking, which is a separate cost.

Ways to keep a garage conversion affordable

  • Check local rules first, including parking replacement and ADU regulations.
  • Skip plumbing unless you need it. It is the biggest cost after the basic finish.
  • Insulate and air-seal well. A garage is the coldest, leakiest room in most homes.
  • Use a ductless mini-split instead of extending ducts if your system has no spare capacity.

Related guides

Plan the rest of your project