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

Cost to Add a Bathroom by Type 

You’ll want to plan the type of bathroom addition depending on its location in your home. Full and primary bathrooms are typically for 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 ranges from $4,000 to $12,000. Half bathrooms, also called powder rooms, average 15 to 20 square feet and feature a toilet and sink. A basic conversion of an existing walk-in ground-floor cupboard with plumbing might cost around $3,000. You could splash out as much as $15,000 for a brand-new powder room with top-of-the-range fixtures. 

Three-Quarter Bathroom

Expect to pay $6,000 to $22,000 to add a three-quarter bathroom. These small, tub-free spaces typically include a sink, toilet, and shower and measure 25 to 40 square feet. If you DIY some or all of the work, you can add a fully functional bathroom to an existing plumbed room (such as a finished basement) for $4,000 or less. Hiring a contractor to add a prestige three-quarter bathroom with a luxury walk-in shower could cost up to $25,000. 

Full Bathroom

Adding a full bathroom costs an average of $10,000 to $50,000. They feature a sink, toilet, shower, and bathtub, and final costs vary considerably depending on the size of the space—they can range from 40 to 100 square feet. Sometimes called five-piece bathrooms, they often include five plumbed features (a bidet is a common extra example) or a built-in cabinet or linen closet.

Primary Bathroom

Adding a primary bathroom that connects to the main bedroom in the house costs from $22,000 to $90,000. It’s a wide range because these spaces can measure 100 to 200 square feet, and fixtures, fittings, and installation complexities vary considerably. A basic, small conversion could cost $15,000. Adding a large new room with high-end fixtures like a double vanity, freestanding tub, and walk-in shower could cost over $100,000. But it could be well worth it to have your kid-free restorative retreat.

Jack and Jill Bathroom

The average cost to introduce a space-saving Jack and Jill bathroom is $25,000 to $100,000. These bathrooms are accessible from two bedrooms or accessible from one bedroom and the hallway. Often measuring 100 to 200 square feet, these big spaces can be costly to create. You might have to partition existing bedrooms or add two or three doors. They often feature two sinks and even an enclosed toilet for extra privacy or two showers.

Wet Room

The average cost to add a wet room is $4,000 to $15,000. These accessible, sleek, space-saving spaces typically run from 25 to 50 square feet. While they are often around the same size as a three-quarter bathroom, costs can run higher as wet rooms involve tanking (waterproofing) the entire space and grading for drainage. A lavish, large wet room could cost $30,000.

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.

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.

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 to $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 in 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, for some families, fighting over one restroom can get old fast.

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. 

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. 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. 

You can create a beautiful bathroom without breaking the bank. Here are common options you have to choose from for budget materials:

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 relax and save your time and energy for another project.

Convert 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. 

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