Cost To Add A Bathroom

Last Updated on December 27, 2023
Written by CPA Alec Pow | Content Reviewed by CFA Alexander Popinker

There are quite a few people who would consider the presence of one more bathroom a major home improvement. Its usefulness is greater in large families or when cohabitation like getting a flatmate is adopted. In addition, a second bathroom can also increase the value of the home.

Even if the construction plans and piping do not provide for such a utility, there is the possibility of setting up another bathroom, taking into account a few aspects.

First of all, you must seek the help of an installation company that will guarantee the safety of the extension of the drain and supply pipes and will ensure that they have the capacity to support two sanitary groups without creating defects in the structure of your apartment as well as in those of the other tenants.

How much does it cost to add a bathroom?

The main factors that will influence the cost to add a bathroom are whether there is a space where you want to add it or whether you need to create an addition.

The cost of adding a new bathroom addition is around $30,000, while for adding a bathroom to an existing space you will need to spend around $15,500.

Be prepared to spend anywhere between $5,500 and $100, for adding a bathroom.

Besides these two main factors, there are other variables that will affect the cost to add a bathroom. We are going to talk about each of these in the following lines.

Cost to add a bathroom by size

The square footage of the area is one of the most important factors that will affect the cost of adding a bathroom.

Plan on spending anywhere between $220 and $320 per square foot for adding a bathroom. Luxury bathrooms may cost around $670 per square foot, while low-end bathrooms are priced at $55 per square foot.

How much does it cost to add a bathroom in an existing space?

In case you want to add a bathroom to a space you already have in your house, one of the most important factors that will impact the overall cost is what room you decide to transform into a bathroom.

For instance, it would be more expensive to transform your bedroom into a bathroom than to convert the laundry room into a bathroom.

Below you will find the estimated costs for converting various spaces from your home into a bathroom.

Room	Average Cost
Attic Conversion	$9,000 – $37,000
Bedroom Conversion	$16,000 – $55,000
Closet Conversion	$5,500 -$22,000
Garage Conversion	$16,000 – $33,000
Laundry Room Conversion	$5,500 – $15,000
One Bathroom into Two Bathrooms conversion	$12,000 – $33,000

How much does it cost to convert a garage into a bathroom?

The garage will offer you a lot of freedom in terms of layout, space, design, and others. Though, the costs may get high because you will need to extend the insulation, cooling/heating, and plumbing into the garage.

Be prepared to spend anywhere between $15,500 and $30,500 for converting a garage into a bathroom.

How much does it cost to convert a laundry room into a bathroom?

When transforming an existing space into a bathroom, the most affordable option is converting the laundry room into a bathroom because you will be able to save thousands of dollars on plumbing.

Be prepared to spend anywhere between $5,500 and $14,000 for transforming a laundry room into a basic bathroom.

How much does it cost to convert an attic into a bathroom?

The cost to convert an attic into a bathroom will depend mostly on the finishing level of the attic. For instance, the costs will be lower if the attic is finished because you will only have to install the plumbing and fixtures in that space. So, you should be prepared to spend anywhere between $6,500 and $26,000 for adding an attic bathroom, depending on the desired level of finish and the size of the bathroom.

If the attic is not finished, you will need to spend $10,000 to more than $15,000 for the first finish.

It will not be possible to add a bathroom to a crawl attic.

How much does it cost to convert a closet room into a bathroom?

If you want to have a small bathroom in your house, it would be a great idea to convert a closet into a bathroom.

As the size of this space is pretty small, the costs will be lower. So, you will need $3,800 to $9,000 to transform a closet into a bathroom, depending on how far it is from the current plumbing.

For example, it will be much cheaper to convert a kitchen closet into a bathroom than to transform a bedroom closet into a bathroom as the first one is placed closer to the kitchen’s plumbing system.

How much does it cost to split an existing bathroom?

If you want to have a bathroom for each bedroom in your house, you can turn one bathroom into two small bathrooms.

It is not that expensive to simply split the bathroom and you do not want to upgrade the current fixtures. Though, the costs will increase if you want to install new tiles, flooring, and fixtures for both bathrooms.

How much does it cost to convert a bedroom into a bathroom?

If you want to have a master bathroom in your home, you can transform a bedroom into a bathroom.

As the space is larger than other options like closets, the expenses will be higher. Also, you will have to add plumbing and this will increase the costs.

How much do the materials and installation cost for adding a new bathroom?

A large portion of the overall expenses of adding a new bathroom consists of the costs of all bathroom parts like vanity, shower, sink, and toilet. The price of each of these will depend on the type of product you want.

In the table below you will find the average costs for some of the most popular bathroom parts, including both the installation and materials.

Item	Average Cost
Drywall	$1,100 – $3,300
Flooring	$5 – $10 per square foot
Lighting Fixtures	$200 – $800
Shower Door	$250 – $1,200
Shower/tub	$750 – $3,300
Tile	$8 – $12 per square foot
Toilet	$300 – $550
Vanity and Sink	$220 – $650

The cost of installing bathroom flooring

Depending on the size of your bathroom and the type of tile you choose, you will have to get anywhere between $750 and $2,200 out of your pocket for installing tile flooring in your bathroom.

You might also like our articles on how much it costs to build a guest house, demolish a house, or build a brick house.

A much more affordable option than stone flooring or tile is vinyl flooring. Expect to pay anywhere between $4 and $5 per square foot for installing vinyl plank flooring, including materials and labor.

The cost of installing bathroom tile

In case you want to install tile on the floor, countertop, or walls in your bathroom, you should be prepared to pay anywhere between $9 and $12 per square foot.

The average cost for installing tile in the whole bathroom would be anywhere between $1,900 and $4,800, depending on the quality of the tile and the size of the bathroom.

The cost of a tub/shower

You can spend anywhere between just a few hundred dollars and thousands of dollars for a bathtub or shower. For instance, a simple tub costs around $850 and the price of a simple shower is around $320, while for a full bath or shower you will have to pay a few thousand dollars.

The cost to install a shower door

Depending on the type of glass and door design, you will have to pay anywhere between $120 and $1,300 to install a new shower door.

The cost of a toilet

You can purchase a standard toilet for $120 to $220 and pay $170 to $270 for installation.

On the other hand, the cost of a high-end toilet like a Japanese toilet is more than $2,000.

The cost of installing a sink/vanity

Depending on the vanity material and the sink you choose, you will have to pay anywhere between $370 and $2,700 for installing a vanity and sink.

The cost of drywall for building a bathroom

Most probably you will need a minimum of one wall to build your new bathroom. Be prepared to pay anywhere between $3 and $5 per square foot to install drywall. The total cost to install drywall in a 100 square feet bathroom would be anywhere between $650 and $900.

The cost to install bathroom lighting

Be prepared to spend $950 to more than $1,200 for installing recessed lighting in your bathroom and $720 to $1,300 for installing new electrical wiring for an overhead light.

The cost of a lighting fixture would start at around $100 and go up to more than $2,000.

Labor costs

Depending on the place where you are living and the complexity of your project, you will have to pay anywhere a professional between $90 and $120 per hour for remodeling your bathroom.

In case you need to add plumbing, the installation labor would cost you anywhere between $85 and $125 per hour.

Be prepared to spend anywhere between $750 and $1,600 for labor alone, for plumbing a new addition. If you were to also include the materials, the costs would be anywhere between $1,200 and $11,000.

An electrician will have similar prices as a plumber, so the labor costs for an electrician will be anywhere between $85 and $125 per hour.

Permit costs

You will be required to have a permit for any plumbing and waste pipes that you bring to a new location.

Depending on the place where you live and the type of permit, the cost of the permit would be $260 to $650.

Final thoughts

Designing an extra bathroom is a complex and difficult project, from which you can get some important benefits. In addition to the added convenience and utility that any additional bathroom brings to a home, the value of your home will also increase.