How Much Does It Cost to Add a Bathroom in 2025?
Adding a bathroom costs an average of $35,000
Adding a bathroom costs an average of $35,000, with a range between $5,000 and $75,000.
Costs vary based on location, labor, fixtures, and installation costs
Converting existing space is generally less expensive than building a new addition.
Adding a bathroom can increase your home's value and improve its resale potential.
Hiring a bathroom remodeling professional ensures the project is completed safely and to code.
This article was updated using automation technology and thoroughly reviewed for accuracy by HomeAdvisor Editor Ryan Noonan.
On average, homeowners spend around $35,000 to add a bathroom, but costs can range from $4,000 to $120,000 depending on the bathroom type, size, labor, and features you choose. Whether you're planning a simple half bath or a luxurious master suite, understanding the factors that influence the cost will help you plan your project effectively.
Bathroom Addition Cost Factors
Many factors impact your bathroom addition costs, including whether you’re adding onto your home or converting an existing room into a bathroom, as well as permits and labor rates for plumbing and electrical pros. Here are the cost breakdowns for these factors.
Build Type
On average, adding a bathroom to your home costs $375 per square foot, but this cost varies depending on whether you’re adding on to your home or converting an existing room into a bathroom. Here’s the cost-per-square-foot breakdown for these two different types of builds.
| Build Type | Cost per Square Foot |
|---|---|
| Conversion | $200–$250 |
| Addition | $400–$550 |
Permits
Permits can range from $50 to $2,000, depending on your location and the scope of your project. Typically, you'll need permits for electrical work, framing, drywall, plumbing, and certain finishes. Since requirements vary by area, it's important to check with your local code enforcement office. Permits are generally necessary if you're planning to:
Alter the existing floor plan
Make structural changes, such as adding doors or windows
Install new ductwork or modify existing systems
Relocate or install new electrical or plumbing fixtures
Labor
The hourly rate for a local plumber ranges from $45 to $200, depending on location, experience, and licensing level. Plumbing a new bathroom can cost anywhere from $1,000 to $10,000, depending on how close it is to existing plumbing and how complex the job will be. The farther away it is and the more complex it is, the more you’ll pay. It’s best to place your new bathroom near existing plumbing. Otherwise, the cost of running new lines to your bathroom can dominate your budget.
Bathroom plumbing rough-in costs $3,000 to $20,000, depending on the number of fixtures you want. Sometimes, that price includes final hookups as well as the rough-in, but it will require a second trip. Once a plumber completes a rough-in, they must wait until the floors, walls, and cabinets are installed to come back out and install the fixtures and make connections.
Hiring a professional electrician costs $50 to $100 per hour. Adding electrical to a new bathroom costs between $500 and $2,500. You’ll save most of your electrical costs if you use an existing space with existing circuits.
Cost by Bathroom Type
The type and size of bathroom you install will determine the final cost of your bathroom addition. Keep costs down by putting it near existing plumbing. Here are the costs associated with different bathroom types.
Master Bathroom
Adding a primary bathroom costs $22,000 to $90,000, depending on the fixtures and features you choose. Luxury additions add to the cost—here are some to consider:
Steam showers cost $2,800-$7,100
Whirlpool tub installs run an average of $10,000
Half Bath or Powder Room
Adding a half bathroom, also known as a powder room, typically costs between $4,000 and $12,000. This is a great option to enhance guests' convenience and reduce traffic in your main bathrooms without taking up much space.
Three-Quarter to Full Bath
A full bathroom typically costs between $10,000 and $50,000, and a three‐quarter bathroom typically costs between $6,000 and $22,000.
Cost to Add a Bathroom in an Existing Space
Transforming an existing space into a bathroom typically costs between $5,000 and $35,000, with most homeowners spending around $15,000. The final price depends on factors like the room's location, the finish quality you desire, and how close it is to existing plumbing.
| Bathroom Location | Average Cost Range |
|---|---|
| Upstairs | $8,000–$35,000 |
| Laundry Room | $5,000–$19,000 |
| Attic | $8,000–$35,000 |
| Garage | $8,000–$25,000 |
| Bedroom | $15,000–$50,000 |
| Closet | $5,000–$10,000 |
| Existing bathroom split | $10,000–$30,000 |
Upstairs
Adding a bathroom upstairs can cost between $8,000 and $35,000. A key factor is whether there's existing plumbing on the second floor. If you're placing a bathroom where no plumbing currently exists, you'll need to install new lines, which can increase the cost.
Laundry Room
Turning your laundry room into a bathroom typically costs between $5,000 and $19,000. Since the plumbing is already in place, you can save a significant amount on installation costs. With only minor modifications needed, adding a half bath or powder room could be an affordable way to enhance your home's convenience.
Attic
Converting attic space into a bathroom costs $8,000 to $35,000, depending on the level of finishing required. Unfinished attics will cost more due to the need for insulation and drywall.
Garage
Installing a bathroom in your garage costs between $8,000 and $25,000. Garages offer flexibility in spacing and design, and because they often have easy access to electrical and plumbing connections, you can keep costs down. If the bathroom is primarily for utility purposes, standard finishes may suffice, making this an economical option. 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.
Bedroom
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 choose anything from builder-grade basics to high-end works of art.
Distance from Plumbing: The farther you are, the longer it will take to run lines.
Closet
Converting a closet into a bathroom can cost between $5,000 and $10,000, depending on the closet's size and its proximity to existing plumbing. Due to limited space, closet conversions typically focus on essential features, making them a practical option without the need for elaborate fixtures.
Existing Bathroom Split
Turning one bathroom into two costs $10,000 to $30,000 on average, which can be a good investment if you're creating a master suite or increasing the number of bathrooms to match the number of bedrooms.
Bathroom Fixture Installation Costs
Bathroom fixtures run a wide range of costs depending on the quality you choose. These are the average cost ranges of bathroom fixtures.
| Bath Fixture | Average Cost Range |
|---|---|
| Shower | $1,500–$14,000 |
| Shower or bath liner | $1,800–$5,200 |
| Glass shower door | $500–$1,400 |
| Faucet | $150–$500 |
| Bathtub | $1,100–$5,900 |
| Toilet | $200–$800 |
| Vanity | $400–$5,000 |
| Medicine cabinet | $200–$500 |
| Exhaust fan | $300–$1,000 |
| Sink | $60–$500 |
| Lighting | $150–$900 |
DIY vs. Hiring a Bathroom Remodeler
While you may be tempted to tackle your own bathroom addition, especially if you’re handy, it’s wise to hire a professional bathroom remodeler to take on the job for you. Properly remodeling or renovating a bathroom requires expertise in plumbing and electrical work, as well as installing fixtures, and a remodeling pro can manage these components to ensure that your new bathroom addition is built safely and to code.
Does Adding a Bathroom Increase Home Value?
Adding a bathroom enhances your home's functionality and can increase its value. Homeowners often see a 55% return on investment (ROI) for a bathroom addition when selling their home. Beyond the financial return, an extra bathroom improves daily convenience and can lead to energy and water savings with modern, efficient fixtures.
How HomeAdvisor Gets Its Cost Data
No place is more important than your home, which is why HomeAdvisor connects homeowners with local pros to transform their houses into homes they love. To help homeowners prepare for their next project, HomeAdvisor provides readers with accurate cost data and follows strict editorial guidelines. After a project is complete, we survey real customers about the costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Frequently Asked Questions
Adding a bathroom to a house with a concrete slab foundation is possible but requires specialized methods to install new water and sewer lines. Concrete professionals will need to cut through the slab carefully while maintaining the foundation's integrity, ensuring that utilities are integrated without causing structural issues to your home.
A bathroom addition project takes between five and 12 weeks from design to completion. The timeline depends on the project's complexity, the size of the space, and the extent of plumbing and electrical work required. Hiring a bathroom remodeling professional to coordinate with contractors and securing permits promptly can help keep the project on schedule.
Deciding whether to add a bathroom upstairs or downstairs depends on your home's layout and your specific needs. Proximity to existing plumbing is a major cost factor, so you’ll want to assess your budget when deciding where to locate your bathroom addition.
An upstairs bathroom offers convenience for bedroom areas, enhancing privacy and functionality. Adding a bathroom downstairs can benefit guests and improve accessibility in main living areas. Evaluate where an extra bathroom would best serve your household.
Get our Angi-powered app
