How Much Does Bathroom Addition Cost?

Perhaps, you have lots of people sharing one bathroom in your abode. If this is the case, it might make sense to add another bathroom to relieve congestion at busy times and to add some convenience for guests.

Bathroom addition will not only solve your problem but it can also refresh a home’s interior and boost its overall value. However, you may wonder how much does it cost to add a bathroom, which is an important step to getting your dream bathroom.

bathroom renovation

Let’s find everything you need to know about the fees associated with adding another bathroom to your home.

Average Cost of Bathroom Addition

A few of the factors that have the largest impact on the average cost of adding a bathroom include the following:

  • Location
  • Size and Design of the Bathroom
  • Access to Existing Plumbing
  • Materials You Choose
  • Labor Rates

Additionally, the cost of adding a bathroom will vary significantly based on your particular project.

  • For instance, if you are not moving any items around and the plumbing is ready, a modest bathroom addition can cost as low as $3,500 to $10,500.
  • If you’re attaching a brand new room or transforming a room without plumbing like a garage, basement or attic into a bathroom, the average cost of adding a bathroom will be closer to $17,000 to $25,000.
  • If you are adding new floor space to your home for a basic 6×8-foot bathroom addition, the cost will start around $28,000, going up to $60,000. These estimates include labor, fittings, fixtures,  and finishes, like tiling, flooring, and painting.
  • If you are adding some customized features or upgrades, like a 100-square-foot spa bathroom, the cost could easily exceed $78,000.00, so manage your budget.

According to Improvenet, the average range of a simple bathroom addition is between $6,569 and $9,872, with a mean cost of $8,820. This figure is based on 12,535 cost profiles of their members.

However, the most quoted average cost of adding a bathroom to a house is $43,232, according to Remodeling. This consists of a 6×8 foot bathroom, over a crawlspace, with poured concrete walls. It also includes:

      • chrome faucets (standard)
      • 30×60 inch white fiberglass tub or shower
      • cultured marble vanity top w/ molded sink
      • single-lever temperature & pressure balanced faucet
      • a low-profile toilet (white)
      • linen storage closet
      • electrical wiring
      • mirrored medicine cabinet
      • painted trim
      • vinyl wallpaper
      • ceramic tile floor
      • general & spot lighting

They also added that, for a hundred square foot new master bathroom, the national average of this project is $81,515.  It included several features such as:

  • 42x 42 inch shower
  • ceramic tile walls
  • glass enclosure (frameless)
  • accent strip, recessed shower caddy
  • soaker tub (freestanding) w/ high-end faucets
  • countertop with 2 sinks (stone)
  • 2 medicine cabinets w/ lighting (mirrored)
  • commode area w/ 1 piece toilet (compartmentalized)
  • exhaust fan (humidistat-controlled)
  • bigger ceramic floor tiles
  • spot lighting
  • shower fixture (waterproof)
  • customized cabinetry drawer base & wall cabinets
  • Extended HVAC system
  • in-floor electric heating

Bathroom Addition Installation Projects and Costs

When trying to figure out how much does it cost to add a bathroom, it is important to make sure that possible contractors present you with a full cost breakdown list for each phase of the project. The more accurate the cost breakdown list, the greater chance that the estimate will be the close to the actual cost of your bathroom addition. Below are some of the bathroom projects with their estimated costs.

  • Installing Pipes

First, you have to attach new plumbing since it goes into the walls. The cost of installing pipes could range from $55 to $4000. However, most individuals spend around $1,004. The cost may go higher if you’re combining other features, like a shower tub combo. Keep in mind that the prices can vary substantially with each individual’s home, the bathroom size, and pipe material.

  • Installing the Shower

The average shower installation cost is $3,193, with a range of $1,141 to $5,340. And advanced showers come with higher prices. So, to keep your shower addition cost low, review the costs of the different parts that come with the showers.

  • Tiling: $310 – $3,500
  • Inserts: $60 – $700
  • Stall Doors: $120 – $500
  • Frameless Doors: $175 – $1,800
  • Pan: $250 – $750
  • Glass Panels: $870 – $1,250
  • Glass Doors: $520 – $1,300
  • Heads: $15 – $350
  • Installing the Bathtub

The typical range  of bathtub installation is $1,023 to $4,910, with a national average of approximately $2,959. See the price ranges for the different material for tubs below. Remember, these prices do not include the installation.

  • Fiberglass: $270 – $2,100
  • Steel: $300 – $500
  • Acrylic: $600 – $2,200
  • Cast Iron: $400 – $1,500
  • Copper: over $3,700
  • Cultured Marble: $1,600 – $2,700
  • Installing Flooring

The average flooring installation cost for 120 square foot bathroom is between $1,400 to $2,100. This price includes the local material, the preparation of worksite, clean after project completion and the labor rate.

  • Installing the Toilet

If the pipes are positioned and you don’t go overboard on the Toilet price, your toilet installation could cost around $240 to $600.  A plumber can charge from $60.00 to $120.00 an hour, depending on the job and location.

  • Installing the Sink

Most homeowners need between $400 and $790 to efficiently install a sink, with an average price of $135. However, depending upon on your bathroom sink design (under mount, vessel, or pedestal), your installation cost could puff up to $1,000.

  • Installing the Countertop

Due to a wide range of real material prices, countertop installation costs can range from $125 to $6,025, with an average of $2,719. Granite and quartz have been the top choices in the countertop industry lately, while the stone is a consistenly well-liked choice for bigger budget bathroom addition.

  • Installing the Faucet

Usually, the total cost to install a faucet ranges between $250.00 to $350.00, including a mid-grade fixture. If the plumbing is on point, contractors should be able to install the faucet in less than 2 hours.

  • Installing the Cabinet

Installing cabinets is not cheap. In fact, anticipate paying anywhere from $450 to $14,500 for the whole cabinet installation, with an average cost of $4,677.  The materials and whether or not you pick a contractor will determine the price.

Do-It-Yourself Bathroom Addition

Adding a bathroom can be an expensive project. You can keep the costs down by doing the job yourself. Typically, contractor labor costs are about 40 percent of the entire cost. Thus, if you do the project by yourself, that’s more money in your pocket. But first, you need to be honest about how skilled you are.

Although saving some money sounds excellent, you may still feel a bit overwhelmed about taking on the entire job yourself. If you want to do it yourself, think of dividing up the project and working on what is within your skill level and timetable, and save the more challenging projects for a contractor.

Just make sure to tell your contractor about that you’ll be working on, to avoid confusion later. Below are several easy DIY projects:

  • window and baseboard trim installation; save $150 to $250
  • Painting 200 square feet  of walls and trim; save $200 to $350
  • Towel bars and shelf installation; save $30 to $100 each
  • Toilet installation; save $200 to $500


Adding a bathroom is the best choice if you’re looking to enhance your lifestyle and the value of your home. But, it can get pricey fast, so set your priorities and choose where to spend lavishly and where to save.

Knowing how much does it cost to add a bathroom and having the estimates at your disposal will allow you to set your goals.

It’s a good idea to take these numbers and consult with a licensed contractor. Make sure to ask them how your design ideas will impact your estimates.

Doing so will help you learn the process, teach you what to prepare for, and help you achieve the best value from the project.

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