How Much Does It Cost To Add A Bathroom?


(40 sq.ft. bathroom)
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Bathroom Addition Costs

Professionals & Services Cost Guides      Home Remodeling      Bathroom Addition Costs

Perhaps you want to have a bathroom added to your master bedroom. Maybe you have a growing family and you know that you are going to need to have a new bathroom soon. Regardless of the reason, you need to start thinking about the logistics and the costs of adding the bathroom.

In some cases, you might have a room already in the home that you want to transform into a bathroom. Other times, you may need to have an entirely new room added to the house. If you have to opt for adding a brand new room, the cost will be much higher than converting a space you already have. This is because the room itself needs to be built and added to the house. Even a small bathroom addition will be costly.

Bathroom addition: 40 sq.ft. bathroom.

Item Unit Cost Quantity Line Cost
Foundation, framing, finishing $124 per sq.ft. 40 $4,960
Shower/Tub: installation included $1,200 each 1 $1,200
Toilet: installation included $500 each 1 $500
Sink/Faucet: installation included $400 each 2 $800
Tile flooring: installation included $14 per sq.ft. 40 $560
Labor Cost (electrician) $70 per hour 16 $1,120
Labor Cost (plumbing) $120 per hour 34 $4,080
Total Cost $330.50 per sq.ft. 40 $13,220


Other considerations and costs

  • Having a separate shower and tub will add to the overall cost of the bathroom addition.
  • Depending on the materials you are using the cost can vary. You can keep the costs down by using cheaper materials.
  • You will need to have a permit to add a bathroom to the home. Once it is installed, it will need to meet all of the code requirements.
  • Adding a new bathroom to the home can help to increase the home’s value.
  • Remodeling and expanding an existing bathroom is cheaper than choosing an addition.

Check out our guide if you need a loan for your home improvement project.

DIY considerations

  • While there are some elements that you might be able to do on your own, such as painting or even the flooring, the scope of a bathroom addition is large. It is best left to the professionals.


  • Craftsman Estimator Costbook, complete series year 2019.
  • Latest prices found on Home Depot and other vendor Web sites.
  • Literature review of DIY Websites.
How much does it cost to add a bathroom in your city?
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Cost by city

(40 sq.ft. bathroom)
  • New York, NY$21,236
  • Bronx, NY$17,451
  • Brooklyn, NY$14,544
  • Philadelphia, PA$18,144
  • Washington, DC$15,745
  • Atlanta, GA$14,245
  • Miami, FL$12,956
  • Fort Lauderdale, FL$13,571
  • Minneapolis, MN$15,921
  • Chicago, IL$18,549
  • Houston, TX$19,133
  • San Antonio, TX$12,843
  • Austin, TX$14,542
  • Denver, CO$12,287
  • Phoenix, AZ$12,963
  • Las Vegas, NV$14,228
  • Los Angeles, CA$16,032
  • San Diego, CA$14,548
  • San Jose, CA$17,572
  • Seattle, WA$12,865

Local costs have been calculated by accounting for labor and material cost differences across different cities. To get accurate cost estimates, indicate yours: