How Much Does It Cost to Add a Bathroom? [2025 Data]

The average cost to add a bathroom is $35,000, but this price varies greatly with the type of bathroom and features you want to add. Bathroom additions cost $400 to $550 per square foot. As a result, most homeowners pay between $5,000 and $75,000. For a large bathroom addition, you could spend up to $120,000 or more. 

When you’re tired of everyone in your house using the same bathroom, you know it’s time to add another one. This breakdown covers the major factors that affect the total cost of adding a bathroom.

Cost to Add a Bathroom by Type 

You’ll want to plan the type of bathroom addition based on its location in your home and your budget. Full and primary bathrooms are more common in primary bedrooms and the second floor, while you might go with a half bathroom for a first-floor guest bathroom. Here are the costs you can expect by type.

• Half bathroom: The average cost to add a half bathroom, which has two of four major bathroom fixtures, ranges from $4,000–$12,000 for a 15- to 25-square-foot space. You could spend as little as $3,000 for a basic conversion or as much as $15,000 for a brand-new powder room with designer fixtures.

• Three-quarter bathroom: Expect to pay $6,000–$22,000 to add a three-quarter bathroom that’s around 25–40 square feet. This type of bathroom has three out of four major bathroom fixtures. You could spend as little as $4,000 if there’s existing plumbing or as much as $25,000 for a luxury bathroom addition.

• Full bathroom: Adding a full bathroom costs an average of $10,000–$50,000. This type of bathroom ranges from 40–100 square feet and has a sink, toilet, shower, and bathtub. Larger layouts include a built-in cabinet or linen closet.

• Primary bathroom: A primary bathroom addition costs $22,000–$90,000 and connects to the primary bedroom in the home. You could spend as little as $15,000 on a basic conversion or more than $100,000 for high-end fixtures like a freestanding tub and luxury walk-in shower.

• Jack and Jill bathroom: A Jack and Jill bathroom addition costs $25,000–$100,000, depending on the fixtures and scale. These bathrooms connect two bedrooms or one bedroom to a hallway. Depending on the design, they measure 100–200 square feet and often have two sinks and an enclosed toilet. 

• Wet room: The average cost to add a wet room is $6,000–$20,000, but you could spend up to $30,000 on a luxury design. Wet rooms are around the same size as a three-quarter bathroom, but costs can run higher for tanking (waterproofing) the entire space and grading for drainage.

Bathroom Size

Your bathroom’s square footage majorly influences the cost. A bathroom conversion costs $200 to $250 per square foot, whereas a bathroom addition costs $400 to $550 per square foot.

Cost to Add a Bathroom by Location

Where you build a new bathroom will impact its final cost. Here are the average prices of adding a bathroom based on its location.

• Upstairs bathroom: These additions can make the late-night trek to the bathroom easier. But whether you have existing plumbing upstairs can impact this project’s total cost. 

• Laundry conversion: Since plumbing is already available in your laundry room, this is one of the more wallet-friendly ways to add a bathroom to your home. 

• Attic conversion: If you want to convert an unfinished attic into a bathroom, the cost to finish your attic will run $15,000–$35,000 for the necessary plumbing, electrical, and insulation work.

• Garage conversion: If you spend a lot of time working in your garage, adding a basic bathroom there can save you a trip to the house. 

• Bedroom conversion: If a three-bedroom, one-bathroom space doesn’t fit your family’s current needs, then converting a small bedroom into a luxurious bathroom is tempting. 

• Closet conversion: The cost of converting an unused closet into a bathroom depends on its size and distance from existing plumbing. 

• Splitting one into two: While bigger bathrooms sound better on paper, fighting over one restroom can get old fast for some families.

Labor Cost to Build a Bathroom

Labor makes up roughly 55% of the total project cost. If you’re adding electrical and plumbing to a new bathroom. Plumbers cost $45 to $200 per hour, while electricians cost $50 to $100 per hour.

Additional Costs to Consider 

Here are all of the additional costs you should plan for when you’re adding a bathroom to your home.

Features

If you want your bathroom to have premium features, it will cost you extra. A jetted tub or Whirlpool can cost around $10,000, for example. Vanities can cost anywhere from $500 to $4,000. We cover different bathroom features below so you know how much to budget for your specific project.

• Shower installation: Shower installation costs anywhere from $1,200–$19,000, depending on the design. A simple prefab shower stall will be on the low end, especially if you already have plumbing hookups, and a larger, luxury walk-in shower will be on the high end.

• Bathtub installation: On average, bathtub installation costs $1,100–$5,900, but you could spend significantly more if you need to move plumbing or choose an upscale soaking tub or accessible, walk-in bathtub.

• Floors: For most homeowners, installing a new floor costs $1,500–$4,900. You’ll spend more on higher-end hardwood than on budget-friendly options like vinyl. Tile comes with higher installation costs, especially if you choose smaller tiles.

• Sink and faucets:  Sink installation costs $200–$700, including faucet installation, but the cost will rise depending on the actual fixture. A designer faucet could cost more than $800, while a high end sink could exceed $2,000.

• Toilet installation: Toilet installation costs $200–$800, but you may need to spend more if the job requires extensive plumbing work and repairs or you choose a high-tech or high-end toilet.

• Vanity and countertops: You’ll spend $400–$5,000 on the cost to install a bathroom vanity or countertops. The total price depends on the materials, as luxury materials like quartz or marble come at a premium. Prefab vanities are the most affordable option.

• Light fixtures: The cost to install a light fixture is $150–$1,100 per fixture, but costs vary with the type of light. Standard ceiling-mounted or wall-mounted lights are the most wallet-friendly.

• Bathroom exhaust fan installation: It costs $300–$1,000 to install a bathroom exhaust fan. Vent fans combat humidity inside your bathroom and prevent mold growth and moisture damage.

• Cabinetry installation: If you want extra storage in your bathroom, you’ll spend $200–$500 to install a medicine cabinet. Additional bathroom cabinetry costs $1,500 to $12,000 depending on the size of the cabinets, level of customization, and materials.

Plumbing

Plumbing is a pricey bathroom addition cost you can expect. The further away from existing plumbing your new bathroom is, the more it’ll cost to install. Plus, you might need a new septic tank, depending on its current capacity and local requirements. On average, expect plumbing to cost $1,000 to $10,000. 

Electrical

Getting your electrical in place is non-negotiable, and the total cost can vary based on if you’re using existing wiring or if your pro will need to install everything themselves. Electrical work for a new bathroom can cost $500 to $2,500. 

Materials

Materials make up about 45% of the total project cost, so the choices you make will be significant. According to the 2024 Cost vs. Value Report from the Journal of Light Construction, a midrange bathroom addition costs an average of $59,000, while an upscale bathroom addition costs an average of $107,500. Here are some of the major considerations to keep in mind when choosing your materials.

Luxury vs. Budget Materials

Luxury materials can help you emulate the feel of a bathroom at a five-star hotel, but you can expect to pay on the higher end of the price range for spa-like features. On the other hand, budget materials can help you stay on budget while still allowing you to bring your vision to life. 

In either case, you should research maintenance needs. For example, a luxury material like marble requires more effort to clean than a budget-friendly surface, like tile. However, while purchasing the least expensive options might be tempting, remember that the lowest-end materials aren’t as durable. 

Sustainable Materials

If building sustainably is a priority for you, look for materials derived from natural elements whenever possible, like ceramic and stone. Ceramic tiles are made from clay, talc, sand, and calcite. Other nonnatural materials, like steel, are considered sustainable because they’re 100% recyclable. Here are some options for you to consider:

Permits

Getting permits is necessary, especially if adding your bathroom will cause structural changes to your home. Permits will account for $50 to $2,000 of this project.

DIY Bathroom Addition vs. Hiring a Pro

While we love a good DIY, a project of this caliber should be left to the pros. Depending on where you want your bathroom added, you might need plumbing, electrical, and foundation work done, and you’ll have peace of mind if you let the pros get this done safely. Plus, you’ll spend much more if anything needs to be fixed, and insurance likely won’t cover the costs since it was a DIY job. 

Instead, contact an insured bathroom remodeler near you who can tackle this job so you can relax and save your time and energy for another project.

Converting Existing vs. Adding a New Bathroom

The average cost to remodel a bathroom is $12,200, which is substantially less than the average cost of $35,000 to add a new bathroom. Remodeling is less costly because you don’t have to add walls or rough-in plumbing. 

In addition to the lower costs of remodeling, these projects take less time to complete, which is an advantage if you have a busy lifestyle. With the right changes to your flooring, walls, fixtures, and more, you can transform your bathroom into something brand-new. The downside is that you’re limited to the space you’re working with, so you can’t make any dramatic changes like taking a half bath and turning it into a Jack and Jill.

On the other hand, adding a new bathroom gives you freedom to do exactly what you want. From the location and size to getting all the amenities of your dreams, this is the ideal route if you have a larger budget and a particular vision in mind.

How to Save Money on Bathroom Installation Costs

Adding a bathroom can be steep, but there are a few tricks to keep your budget low: 

• Take on tasks: DIYing simpler parts of the project, like painting walls or tiling the floor, can go a long way. 

• Don’t go lavish: Avoid high-end materials and opt for attractive substitutions. If you love the way marble looks, consider more affordable quartz options. 

• Go smaller: Building a smaller bathroom will cost less than a full primary bathroom suite.

• Use existing plumbing or electrical: Plumbing and electrical work account for a massive portion of this project. So, consider using a space with these already in place.

Does Adding a Bathroom Increase Home Value?

The good news is that adding a bathroom increases your home value and has an ROI of 55%. One of the first things homebuyers want to know about a property is how many bedrooms and bathrooms it has. The more bathrooms a home has, the more it will sell for.

However, consider whether you’d like to proceed with this project and whether it’s the right decision for you. Small one-bedroom homes might not benefit from an additional bathroom. Plus, the new bathroom could take up precious space that you’d rather use for another purpose, like a laundry room. On the other hand, adding a second or third bathroom to a home with multiple bedrooms can make it more livable.

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on 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. 

Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.