How Much Does It Cost to Add a Bathroom to My Home?

D.P. Taylor
Written by D.P. Taylor
Updated March 23, 2022
Sleek neutral design bathroom
Photo: PC Photography / iStock / Getty Images


  • The typical range to add a bathroom is $5,000–$35,000.

  • Bathroom additions require a significant amount of materials and installation work.

  • Square footage, features, and the new or existing space will impact price.

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They say good fences make good neighbors. But when it comes to a household, more bathrooms make a happier family. If it's time to build an additional bathroom onto your home, this guide will break down the costs. From square footage to bathroom upgrades and features, here’s a look at what you’ll pay to add a new addition to your home.

How Much Does It Cost to Add a Bathroom?

The average bathroom addition cost is $15,000, but this price can vary greatly depending on the square footage and the features you want to add. As a result, the typical range is $5,000 up to $35,000.

But that's only if you're using an existing space to construct the bathroom. If it’s a new build, the price range goes up significantly—$20,000 to $50,000 on average.

Of course, the upper limit can go even higher than that. If you want a premium bathroom addition with a whirlpool hot tub to soak in after a long day at the office, as well as other high-end features, the range could be more like $75,000 to $90,000.

How Much Does It Cost to Add a Bathroom by Type?

small additional bathroom in home
Photo: John Keeble / Moment / Getty Images

There are lots of different types of bathrooms. You might install a full primary bathroom, or opt to convert a laundry room instead. You could also put a bathroom in the attic, or split an existing bathroom into two.

Here’s what you can expect to pay, depending on the bathroom you choose.

Primary Bathroom$35,000 – $100,000
Bathroom Extension$20,000 – $70,000
Basement Bathroom$8,000 – $15,000
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

Bathroom Addition Cost Breakdown

Average costs for bathroom additions, with permits averaging $50 to $2,000

A bathroom addition involves a lot of materials and installation work. Labor typically makes up the majority of costs, but you will also have to pay for some high-end items like vanities.

Here’s where your money goes in a bathroom addition project:

Plumbing$1,000 – $10,000
Electrical$500 – $2,500
Shower$1,500 – $6,800
Shower or Bath Liner$1,800 – $5,200
Glass Shower Door$500 – $1,400
Faucet$150 – $350
Bathtub$1,100 – $5,900
Toilet$200 – $550
Drywall$1,000 – $2,500
Tiling$900 – $2,900
Vanity$500 – $3,800
Light Fixtures$150 – $900
Towel Racks$20 – $100
Permits$50 – $2,000

What Factors Influence the Cost to Add a Bathroom?

Bathroom addition costs by size, with luxury bathrooms averaging $450 to $600 per square foot

The cost to add a bathroom is highly variable and will depend on a number of widely ranging factors.

Square Footage

The size of the bathroom in square feet will have a major impact on the total cost of your project. The larger the space is, the more it will cost. The average cost per square foot for an average bathroom addition is $200 to $300, and for a luxury addition, it's $450 to $600.


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.

Addition or Existing Space

If you're building the new bathroom in a space that already exists, like a former bedroom or in the basement, it's a lot more affordable because you don't have to build an actual structure as you would with an addition. Keep in mind that you may have to factor in the cost to rough in plumbing for a bathroom in a preexisting space.

Bathroom Additions: Which One Fits My Budget?

Chances are, you know how much you want to spend on your bathroom. You’ve probably been dreaming of that oasis, right down to the tile backsplash. But what can you get on your budget? 

Here’s a look at what bathroom features and additions you can get at various price points:


If you bought the materials and installed them yourself in an existing space, you might be able to get a bathroom or half bath for this price. This figure generally only covers the materials, so it would be difficult to hire help and stay under this budget.


At this price, you'll be able to do a thorough bathroom remodel and replace everything. Instead of spending money on installing new plumbing and building out a space, that money can go into the premium features you want. You could get that double vanity or walk-in shower you’ve always wanted.


This is the average cost to install a standard full bath in an existing space. This includes a new shower, bathtub, toilet, vanity, tiling, and all of the electrical and plumbing work to make it functional. The cost may be lower if it's in a smaller space that is already hooked up to plumbing, and it may be higher if you want to install extras like a hot tub.


This is the budget you'll need if you want to build an addition to your home. This will be much more expensive than a simple bathroom remodel because you will be building an entirely new structure attached to the house versus remodeling an existing bathroom.


If you want a bathroom addition that stretches 200 square feet or more and includes premium features like a hot tub with jets, walk-in shower, double vanity, premium tiles, granite countertops, and other luxuries, this is what you could expect to pay.

New Bathroom Installation Costs: DIY vs. Hiring a Pro

Adding plumbing to a bathroom and handling electrical are always best left to the pros to ensure the work meets safety and code standards. Plus, it might cost you even more money in the long run if a contractor has to fix any DIY mistakes. But if you have the experience to take on this project, you can save a lot of money on hiring contractors—perhaps more than half of the total value of the project. Most of the remaining expenses will go toward vanities, drywall, and tile.

For example, if you're doing a bathroom installation that costs $45,000 including materials, home addition permits, and labor, you could choose to do all of the plumbing, electrical, and installation work. The cost just for materials for that project would be about $20,000, meaning you could save around $25,000 by doing it yourself.

However, hiring professionals provides the peace of mind that your bathroom will be safe and done right. If you decide to hire a pro, plumbers charge an hourly rate from $45 to $200, while electricians charge an hourly rate of $50 to $100.

Find a Pro to Help You Add a Bathroom

It’s tempting to try to go it alone, but installing a bathroom is a lot of work that requires specialized expertise. If you want the job done right, it’s best to trust the professionals and spend a little extra.

Find a plumber near you or a local bathroom remodeler who can take a look at the space, talk through your options, and provide you with estimates.

Frequently Asked Questions

You can add a bathroom almost anywhere in a house, but location, space, and existing plumbing and electrical setups are major factors that impact price. Running plumbing and electrical to your new bathroom can become costly, so think strategically about where to add your bathroom. You’ll need a big enough space with plenty of ventilation and enough outlets to accommodate the bathroom you’re envisioning. 

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