If you want to add a bathroom addition to your home, where do you begin?

If you are considering adding a bathroom to your home, you may be wondering where to begin. The first thing you need to think about is whether you want a traditional average bathroom or a larger bathroom. The traditional bathroom is typically located in the main part of the house, while the larger ones are located in a specific room like a master bedroom.

After you decide what size and you like we recommend contacting bathroom addition contractors that will be able to execute your vision. Here at BIL Specialties, we have a team ready to work for you.

This article will you get more information about the different locations, costs, and different types of bathroom additions.

The most common bathroom addition sizes:

The first thing you will want to decide is what size bathroom you want to add.

  • Half Bath or Powder Room or Guest Bath – This size traditionally contains bathroom necessities like a toilet and sink. The half-bath is generally located near living areas of the home like living rooms, kitchens, or other rooms. This type of bathroom addition is used by guests who come by to visit for a few hours, or by those who don’t want to run to another part of the house when nature calls.
  • Three-quarter bath – A three-quarter type of bathroom usually includes a toilet, sink, and shower stall but not a tub. Some older homes have a tub but no shower in a three-quarter bath.  The new owner will usually convert it to a full bathroom by adding a shower head to a shower tub combo.
  • Full bath – A full bath has the toilet, sink, shower, and a tub, or a tub/shower combo. A linen closet, makeup station, and double vanity sink are features that are popular in a full bath but not necessary.

Can it be added anywhere in your house?

Adding a bathroom addition to the house is possible. You have to find space within your house that is large enough to accommodate its size.

Bathrooms might come in handy in places like a guest bedroom, laundry room, kitchen, garage, utility area, and other similar locations.

If you can’t fit a traditional tub-shower combination in your space, consider installing a shower. You’ll get valuable square footage to add toilets, sinks, and vanities where you want.

Overcoming common bathroom addition project challenges

Finding space

Finding an area within your house that can accommodate a bathroom addition is the first step in the process.

Near laundry rooms, kitchens, garages, utility areas, bedrooms, hallways, stairwells, attics, and other similar locations are where bathrooms are typically located.

If you can’t fit a traditional shower tub combo in your floor space, consider installing a walk-in shower. This type of installation allows you to place the toilet where you want without taking up a lot of room. A walk-in closet with a built-in vanity nook is an option. Extra space could be freed up in your bedroom as a result of the storage space added.

Breaking through concrete

There are many pitfalls that need to be considered with this approach. It is expensive to cut into the concrete and this will inevitably weaken the structural integrity of the pad.

The process creates dust and noise, and you can’t be sure what you will find; the slab may be thicker or thinner than anticipated, cracks can develop, and a host of other issues may occur.

Above-floor pipe installation can be used to solve these problems along with several other options a good contractor can walk you through.

Plumbing Lines

The largest challenge of this type of home improvement is plumbing lines in a bathroom addition. Traditional methods of finding room for pipes and waste lines in a house include opening walls or cutting into concrete, which can be inconvenient and expensive.

It is possible to make macerating toilet systems an economical, time-saving, and convenient alternative. You may be aware of the concept of upflushing toilets, which use a pump to move waste. The macerating toilets have a grinding feature that reduces solid waste before it is pumped out. 

Wastewater from a bathroom sink and a shower or bathtub can be accommodated in one convenient system with the help of upflush technology. 

Sink, Shower, Bathtub & Toilet Water supply

Ensuring an adequate water flow for both hot and cold water. This is definitely one challenge you must consider when adding a bathroom. Before embarking on a bathroom renovation project, it is important to assess the capacity of the home’s water heaters.

Is it possible to serve another bathroom with the current water heater? A half bath/powder room will require less hot water than a full bath where people will need lots of hot water for showers.

Finally, it is necessary to inspect the existing plumbing pipes in the home. Are they still in good condition? Will they be able to cope with the added demands of a new bathroom? Will they work well with the new plumbing in the bathroom? 

Adding a bathroom definitely improves both the value of the home and the family’s use of the space. To ensure your new bathroom addition is efficient, user-friendly, and cost-effective, you should address any common challenges with your contractor in the planning stages. 

The most common existing spaces people add a bathroom to

Closet Space Bathroom

The closet is a space-friendly alternative for a simple bathroom addition if your home isn’t large enough for a larger size one.

If your closet has at least 25 square feet, you can convert it into an average bathroom size. It’s similar to a half bath, which can be used for a shower, sink, and toilet installation, but it might be a little cozier than a full bath that includes a tub.

Half baths only increase the value of your home by 10%, whereas full baths add about double the value to your home.

If you have enough room we recommend a three-quarter bathroom when using old closet space for the new addition. The average cost for a bathroom addition of this size starts at around $3,000.


Hall bathrooms are similar to a closet in that they are flexible. A hall bathroom is ideal for a long hallway and empty space between rooms. This can be either a half or full-size bath depending on the size of your space and the rooms around it.

You should plan accordingly. It is possible to make this bathroom style more accessible with a sliding door for example. You will want to hire a professional to find out the plumbing cost if you don’t know if your utilities can support this bathroom before you start.

Installation for this style of bathroom is the cheapest option and will cost anywhere from $3,000 to $5,000 depending on the size.


Adding a master bathroom into a master bedroom is one of the most popular choices that would attract more potential buyers if you ever decided to sell.

There is typically more space to build the style of bathroom you want. To serve as the new bathroom area in your bedroom, create space there for the addition.

If you are not sure if your utilities can support this addition, you may have some additional costs for plumbing and electrical wiring cost.

As you are adding onto an existing space rather than installing a new bathroom, the cost will start around $5,000.


Since most garages are big enough to hold two cars, there is room for a bathroom addition. Because it is ground level and most Dallas homes are designed to have utilities in the garage, you wouldn’t have a lot of issues connecting to the power and water.

Most standard housing code requires a window to provide air circulation so that the humidity from the doesn’t damage your bathroom walls.

It will typically cost between $3,000 and 5,000 to install one of these bathroom addition types.

Under a staircase

Many of the areas below a staircase have shoe closets or pantries, making it a great option for creating additional bathroom space. Again you will want to make sure the space is at least 25 square feet.

A shower, sink, and toilet should fit quite easily with at least a one-square-foot size window for proper ventilation. The advantage of this location is that the stairs in a home don’t see much foot traffic and everyone can easily access the bathroom.

This affordable option has a minimum cost of $3,000 for this installation type.

Extending an existing bathroom

Extending an existing bathroom is a popular option, especially if installing a new one is out of your budget. This would allow you to keep your existing bathroom design and just add some extra space.

Modifications and improvements to your current bathroom situation will allow your contractor to use the existing framework to build off of. This will dramatically reduce stress on your bathroom remodeling cost. This would be considered more of a bathroom remodeling project, but additional square feet might need to be added to accomplish your goals.

Depending on the size of the extension you want to make, this type of remodeling will cost anywhere from $2,000-$5,000 dollars.

How much money will it cost on average to add a new bathroom?

We have already given you an idea of what it would cost to add or renovate different rooms in your home. Below we are going to go into a little more detail.

Cost to Add a Bathroom to a House in an Existing Space

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

HomeAdvisor says a bathroom addition cost can start as low as $5,000 and go up to $50,000 or more. If you want a high-end, spa-like design, the price can get even higher.

New Bathroom Addition Cost Per Square Foot

Average Addition$200 – $300
Luxury Addition$450 – $600

Why do the prices vary so much? The location of the addition and the types of materials used are some of the factors that affect the average bathroom renovation cost.

The average full bathroom costs

Adding a new full bathroom to your home is a big project that will have a price point well into the $25,000-$30,000 range. This is generally the starting range as full master bathroom addition costs can easily climb to $40,000-$50,000 depending on the size of the room. If you add luxurious bathroom features or expensive bathroom fixtures. These things can increase the cost of your addition dramatically.

If you already have a few items in place, your bathroom addition will of course be less. For a Free consultation and estimated cost contact us at BIL Specialties.

3/4 Bath Addition Average Cost

According to HomeAdvisor, this can cost you anywhere between $5,000–$25,000. This range of costs depends on if you’re using existing space that is difficult for a bathroom addition installation. If you need to save a little bit of money, consider going for A three-quarter bathroom rather than a full bathroom.

Cost to Add a Half Bath or Powder Room

It will take between $5,000 and $15,000 to add a half bath to an existing area. On average, it will cost you between $10,000 and $30,000 to add space to make this happen. A half bath has a sink and toilet and does not include a shower or tub.

The Return On Investment a Bathroom Addition Can Bring to Your Home

A plumbing situation can be handled in a number of different ways.  We are going to look at four situations that might apply to y

Depending on how many bathrooms you already have will be a big determining factor in the added value you will see from a full bathroom addition.

Adding an additional full bathroom to a one bathroom home can add as much as $25,000 in value. A new pool of buyers is attracted to a home with two full bathrooms. As for adding an additional full bath to homes that have two or more baths? Depending on the quality, the appraisal adjustment average return is between $7,500 and $10,000.

According to Remodeling Magazine, an upscale bathroom renovation with costs as high as $90,000 but can net sellers a 54.7% return on their investment. A mid-range extra bathroom addition with a $50,000 budget is usually able to recoup around 50%.


Add Space, and Boost Your Property Value by Adding an Extra Bathroom

A bathroom remodel can help improve the overall look of your house while increasing its resale value. However, there are several other important considerations when planning such projects.

For example, homeowners should always consult with professional bathroom addition contractors like BIL Specialties who specialize in these sorts of projects. They will ensure they don’t run afoul of local building codes and regulations. In fact, most areas around the Dallas metroplex require permits for certain kinds of renovations.

If you are interested in any other type of addition check out our list of 12 Room Additions That Can Increase Value & Space in Dallas Metroplex.

What part of your home are you thinking of adding a bathroom?

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