2021 Cost to Add a Bathroom | Basement Bathroom Additions, Half Baths

Adding a bathroom can cost from $5,000 for a simple conversion of existing space to $50,000 and up for a new addition to your house. The national average for a 100-square-foot, spa-like bathroom is over $75,000, so watch your budget carefully. You’ll likely recover 60% to 70% of your investment when you sell.

Existing Space New Addition
Average $15,000 $35,000
Low $5,000 $20,000
High $35,000 $90,000

Bathroom (and kitchens) soak up most of the budget. When done properly, you’ll upgrade your home, add value and improve your resale potential. But they can get expensive fast. Know when to splurge and when you can add value with little investment with the following cost guides.

Average Addition $200 – $300
Luxury Addition $450 – $600
the average cost to add a bathroom is $15,000 or $5,000 to $35,000.

On average, it costs $200 to $300 per square foot to add a bathroom onto your home. Luxury installations might run up to $600 per square foot for a new bathroom addition.

Basement Bathroom Plumbing Rough in Costs

Bathroom plumbing rough in costs $1,500 to $4,000 depending mostly on the number of fixtures you want. Sometimes that price includes final hookups as well as the rough in but will require a second trip. Once a plumber completes a rough in, they must wait until the floors, walls and cabinets get installed to come back out and install the fixtures and make connections.

Some other costs you might want to consider include:

Upstairs Bathroom $8,000 – $35,000
Laundry Conversion $5,000 – $12,000
Attic Conversion $8,000 – $35,000
Garage Conversion $8,000 – $25,000+
Bedroom Conversion $15,000 – $50,000
Closet Conversion $5,000 – $20,000
Splitting One into Two $10,000 – $30,000

Adding a bathroom to an existing space costs $5,000 to $35,000 but most homeowners pay $15,000. Expect that to turn into $125 to $250 per square foot. And remember, you’re not expanding your square footage, so you lose that usable space for something else.

Cost to Add a Bathroom Upstairs

Installing a second-floor bathroom upstairs costs anywhere from $8,000 to $35,000. One major cost consideration is fi the upstairs has any plumbing to it. If you’re installing a bathroom where no drains exist, you’ll need to run new lines

Cost to Turn a Bedroom into a Bathroom

Turning a bedroom into a bathroom costs anywhere from $15,000 to $50,000 on average. However, if you’re creating a master suite, you might pay $90,000 or more depending on a few factors, including:

  • Size of the space. More space means more flooring, tile, amenities and remodeling expenses.
  • Quality of finishes. Finishes destroy budgets. You can go for anything from builder grade basics to high end works of art.
  • Distance from drains and plumbing. The farther you are, the longer it will take to run lines.

Convert Laundry Room to Bathroom

Converting a laundry room to a bathroom costs $5,000 to $12,000 on average. You save a few thousand because most of the plumbing already exists in the space. You’ll have only minor modifications. A budget bath, especially a powder room or half bath, might only set you back $5,000.

Attic Bathroom Cost

Converting attic space into a bathroom costs $8,000 to $35,000. Costs really depend on the level of finishing that already exists.

  • Finished attics: $8,000 to $15,000. You’ll simply need to enclose the part you want as the bath and install plumbing and fixtures.
  • Unfinished attics & higher end installs: $15,000 to $35,000 or more. Your budget should include the bath plus insulation and at least modestly finishing the rest of the existing space (outside the bath area) with drywall and paint.

Cost to Put a Bathroom in a Garage

Garage installs cost $8,000 to $25,000. Garages provide more options for spacing, design and where the electric and plumbing flows from. In some cases, it opens into the garage, meaning you won’t need luxurious finishes, a builder grade room works fine.

But if you’re using the space to expand a bedroom or master suite, you might end up spending int eh range of $15,000 to $50,000. Walls that border a garage usually bear loads, meaning you’ll need to install a header beam to carry the load when putting a door in. You’re also looking at a wide range of finishing costs.

Cost of Converting a Closet to a Bathroom

It’ll cost you anywhere from $5,000 to $20,000 to convert a closet to a bathroom depending on the size of the closet and how far it is from available plumbing and drains. Half baths come in on the lower end while a three quarter or full bath takes up the large amount. Most closet conversions offer the basics and don’t splurge on things like cabinetry, expensive vanities or tiled showers. There just isn’t the space for it.

Turning One Bathroom into Two

Turning one bath into two costs $10,000 to $30,000 on average. It might cost quite a bit more if you intend to also upgrade the fixtures and finishes in both, rather than just reusing what you already have. There are a couple of instances where this is a good idea:

  • When you’re creating a new area for a master suite with its own bathroom.
  • When you’re looking to sell and increase the number of baths to match the number of bedrooms.
Bath Install Task Average Cost Range
Plumbing Costs $1,000 – $10,000
Electrical Costs $500 – $2,500
Shower Install Costs $1,500 – $6,800
Shower or Bath Liner Costs $1,800 – $5,200
Glass Shower Door Installation Costs $500 – $1,400
Faucet Fees $150 – $350
Bathtub Install Costs $1,100 – $5,900
Toilet Installation Costs $200 – $550
Drywall Costs $1,000 – $2,500
Tile Floor $900 – $2,900
Vanity $500 – $3,800
Lighting Fixture Costs $150 – $900
Towel Racks $20 – $100
Permits Cost $50 – $2,000

Backsplash and Tiling

A tile backsplash install costs $600 to $1,400 on average. Master baths might end up paying $2,000 or more, depending on:

  • Material choice. Stone tiles cost far more than ceramic or porcelain.
  • Size & Coverage. Some bathrooms get floor to ceiling tiling, which costs thousands more than just one or two tiles up from the counter or floor.


Flooring installation costs $1,500 to $4,500. Tile flooring costs $900 to $2,600 on average. You’ll want to choose something resilient and waterproof. Tile, bamboo, waterproof engineered hardwood and vinyl make the best choices.

  • Linoleum: $3-$5 per square foot. Waterproof and cheap but not exceptionally durable.
  • Luxury Vinyl Plank: $5-$10 per square foot. Waterproof and mimics the look of hardwood.
  • Marble: $16-$18 per square foot. Hard to maintain and slippery when wet unless you’re using small tiles to create a textured surface.
  • Ceramic or Porcelain: $3-$15 per square foot depending on brand, style and size. It’s durable, easy to clean and naturally germ resistant.


Permits cost $50 to $2,000 depending on your location and what projects you’re doing. You’ll often need permits for electrical, framing, drywall, plumbing and some finishing’s. Permitting requirements vary from place to place, so check with your local code enforcement office. You need a permit if you are going to:

  • Alter the existing floor plan
  • Make structural changes such as adding doors or windows
  • Install new ductwork or reroute existing
  • Relocate or install new electrical or plumbing fixtures

Some value estimates to consider when budgeting include:

  • Half bath adds about 10% to your home’s value.
  • A full bath adds 15% to 25% to your home’s value.
  • You’ll usually recover 60% to 70% of your bath install investment when you sell.
  • It’s tough to sell a home with a single bath. Adding one not only increases the overall value but makes it easier and quicker to sell.

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