$2,500 – $12,500 Remodel Exisiting Space
$18,000 – $47,000 Build A New Addition

The average cost to add a bathroom addition to an existing space is $7,600. Adding a simple bathroom costs as low as $2,500 by remodeling existing space or $22,000+ for a new home addition. The cost depends on if you are using existing space within the home or building onto the house. Get free estimates from bathroom addition contractors near you.

Bathroom Addition Cost

The average cost to add a bathroom addition to an existing space is $7,600 with some homeowners paying as little as $2,500. The cost to build a new bathroom addition to your house will cost around $22,000 on average, or $47,000 to $87,000 on the high-end.

**Average Cost To Add A Bathroom**
National Average Cost	$7,600
Minimum Cost	$2,500
Maximum Cost	$25,000
Average Range	$4,500to$12,400

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Average Cost To Add A Bathroom

Overall you should be able to add a simple bathroom for as low as $2,500 by remodeling existing space or about $22,000 for a new addition. No matter where in the home you are adding a bathroom, the cost will mainly depend on whether you are using existing space within the home or building onto the house. ^[1]

Cost To Add Bathroom To Existing Space

The average homeowner spends about $7,600 for turning existing space into an 80–100 square foot bathroom. ^[2] Whether you’re adding a bathroom in the back of the house to use as a mudroom, or in the master bedroom to use as an en-suite bathroom, additional bathrooms add to your home’s value and increase convenience. If you spend $47,400 on an upscale bathroom remodel, it will increase add value to your home by about $28,700. ^[3]

Cost To Add Bathroom To A Basement

Adding a new basement bathroom costs up to $15,200 for a 6x8 powder room with 8-foot high ceilings. Plumbing labor fees add $720 to $1,350 for setting up a new sewage-ejector system that moves your waste water up and out of the basement area. Most costs for other bathroom fixtures in a basement are about the same as in other bathrooms.

Bathroom Addition Cost Estimator

**New Bathroom Installation Costs**
Fixture	Installed Average	Lowest to Highest
Shower/Tub	$500–$1,000	$400–$3,900
Tile	$4–$7/SF	$4–$9/SF
Toilet	$250–$400	$270–$3,200
Sink/Vanity	$180–$550	$200–$4,600
Flooring	$4–$8/SF	$2–$100/SF
Plumbing	$800	$600–$1,200
Electrical Work	$500	$350–$700

Bathroom Addition Cost Factors

Many variables affect how much your bathroom addition will cost such as:

Location – If the new bathroom is near existing plumbing, it will cost less than if you need to bring plumbing, vents, and waste lines to the new bathroom.
Size – Will you need to knock out walls to make room for the new bathroom or will it go into an unused walk-in closet? Most bathroom additions are inside the home, meaning you won’t have to build out a foundation or add a roof to it.
Scale – Will this be a practical bathroom or a luxe addition to the master bedroom?
Age of your home – Will the plumbing or electrical work need to be updated before the addition can proceed?
Design – Architect hourly rates are $100 to $250 per hour to design the bathroom.
The unknown – Once you begin opening walls and looking into attics, crawlspaces, or basements, you may find some unexpected problems. There could be mold in the walls or a water leak. You might find evidence of pests or asbestos. It’s a good idea to put some extra money in your budget for the unexpected. If you don’t see anything surprising, you can use the extra money to upgrade one of the aspects of your bathroom addition.

New Bathroom Installation Costs

New bathroom installation costs $7,600 on average with most homeowners spending between $4,500 and $12,400 when adding a bathroom to an existing space. Your final cost will depend on if it's a half or full-bath and the quality of materials used.

Shower or Tub Installation Cost

When remodeling your bathroom, a shower/tub combo can be installed for $800–$2,900. Other installations can be figured from the plumber’s hourly rate of $140.

Are you installing a shower, tub, or shower/tub combination? Many larger bathrooms have a separate shower and tub, while bathrooms that are short on space will combine the two into one area. If you're set on installing a bathtub, bear in mind that a full cast iron or steel tub will add 400 lbs. to the floor load, and your home’s floor joists are unlikely designed to handle the pressure.

'When adding a tub, reinforce the floor joists and add cross-bridging between joists. You may also need to double the studs. Even a shower stall can stress floor joists that weren’t designed to support bathroom fixtures.' ^[4]

Lowe’s pricing is as follows:

Showers can be as small as 32 x 32 and cost as little as $290 (includes walls, base, showerhead, shower valve, shower curtain, curtain rod, safety railing).
You can get a 41” corner unit steam shower for $5,230.
A simple, one-piece tub/shower unit costs about $430.
A 36” x 60” whirlpool tub is about $1,440.
A modern, freestanding tub that is 34” x 63” and holds 53 gallons of water is $799.
You can also go the custom-built way and get a shower as large as a small room with multiple shower heads and other luxe amenities.
For seniors or those with limited mobility, a walk-in tub costs$3,000 to $10,000 installed.

A tub can be set and fastened in place for approx. $90 in labor costs before attaching to a water supply and drainage system, while setting and fastening a whirlpool tub will cost about $145. A simple removal of the tub will cost about $30, but add on the cost of dump fees and repairs to the wall and floor.

Bathroom Tile Installation Cost

Tile is an excellent choice for countertops, walls, and the floor because of its water resistance and affordability. The average cost to install tile flooring is $10 to $15 per square foot.

The average cost to install tile a shower or bathroom walls ranges from $7 to $25 per square foot. The price to tile a walk-in shower with 84 SF of walls ranges from $546 to $2,100 depending on what type of material you select.

Tile installation runs from $3.50–$7/SF when you supply the tile. Various tile choices include terracotta, stone—marble, granite, and limestone—glass, metal, slate, and porcelain.

Toilet Installation Cost

Every bathroom needs a toilet and sink. On average, a standard toilet installation costs between $122 and $228, with most homeowners spending around $150 to $180. Add the price of the toilet, which averages $99 to $199 for a total toilet replacement cost of $221 to $427.

Today, toilets are using less water than ever before. Some toilets use a little as 1.2 gallons per flush (GPF), as opposed to the old toilets which could use up to 7 GPF. The difference can represent significant savings on your water bill. Second

$2,500 – $12,500 Remodel Exisiting Space$18,000 – $47,000 Build A New Addition

Bathroom Free Installation