[BLOG] Published: 2021-08-15 - Updated: 2023-05-31

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There are several reasons why you may want to add another bathroom to your home. For instance, your home has outgrown your bathroom with the number of people living there and you just want a master bathroom addition. Depending on what your reasoning is, an extra bathroom is a great addition to your home and it may even increase its value. 

At Smart Remodeling LLC, we have the best bathroom addition Team in Houston to handle the job whether its new construction or you’re remodeling an older home. Here are a few things you need to know about adding a second bathroom. 

The Cost to Add Another Bathroom 

The cost of adding a second bathroom will depend on different factors (Angi L, 2021). If you are adding the bathroom to an existing space, the average cost is $2,500 to $7,600. However, if you are adding a second bathroom from scratch, the cost will be around $22,000 on average or $47,000 to $87,000 on the high-end.


National Average Cost


Minimum Cost


Maximum Cost


Average Range

$4,500 to $12,400

ProTip Takeaway: The second bathroom addition cost will certainly depend on whether you are using existing space within the home or building a new one onto the house.

Cost to Add a Bathroom to an Existing Space 

Adding a second bathroom to the existing space will be much cheaper than building a new one from scratch. You will spend about $7,600 when turning the existing space into an 80–100 square foot bathroom. Even when adding a master bathroom to use as an en-suite in your bedroom, the master bathroom addition will add to your home’s value and increase convenience (HomeGuide, 2021).

For instance, if you spend $47,400 on an upscale bathroom remodel, it will increase add value to your home by about $28,700.

Bathroom Addition Cost Factors 

As highly experienced custom bathroom design experts in Houston, Texas, our Smart Remodeling team knows very well the variables that affect how much a bathroom addition will cost. These variables include:

  • Location. It will cost less if the new bathroom is near the existing plumbing. This will means that fewer materials will be needed to bring plumbing, vents, and waste lines to the new bathroom. 
  • Size and location. The bathroom extension cost will reduce because the additions will be made inside the home. This means you will not have to build out a foundation or add a roof to it. The only thing to be done will be to either knock out walls to make room for the new bathroom or build it into an unused walk-in closet. 
  • Age of your home. Depending on the age of your home, the plumbing or electrical work will need to be updated before the addition can proceed. 
  • Design. Our Designers are the most affordable in Houston and will work with you from designing your bathroom to completion.


ProTip Task: Opening the walls and looking into attics and basements might lead to the discovery of pests or asbestos. Plan for unexpected issues and hidden costs. 

The Value of a New Bathroom 

A master bathroom addition will give you more functionality and livability. The resale value of your home will greatly increase by adding a new bathroom. A full bath addition can enhance your home's resale value by up to 20%, while a half bath can enhance it by 10.5%. 

Location of Your New Bathroom 

We want the best for our clients when helping them in choosing a second bathroom design and the perfect location in the house. Our bathroom addition contractor will tell you that you can install a bathroom anywhere as long as you can afford it. The location and installation will mostly depend on your existing plumbing and electrical structure and as well as the style of bathroom you want.

Areas for a bathroom addition

You can add a new bathroom almost anywhere in your home if you have space available, access to enough electrical outlets, ventilation, and sound insulation (Badeloft, 2018). You will need our  addition contractor to help you identify any available space for the second bathroom addition such as:


A master bathroom addition is a great choice as it is typically built with more space than is utilized. The best idea is to shape out a space in your bedroom to serve as the area for your additional bathroom. But adding a second bathroom this way, our contractors will have to check that your already existing utilities can support this.

If not, you may need to pay more to install more plumbing and electrical functions. The price for this is around $3,000 as you are adding onto an existing space rather than installing an entirely new bathroom.


A hallway bathroom is another great option if your home has a long hallway with a fair bit of space between rooms. This can either be a half or full-size bath depending on the size of your space available. Installation can run anywhere from $3,000 to 5,000 depending on the size.


A walk-in closet can serve as a second bathroom, a half bath, which can easily fit a shower, a sink, and a toilet. If you have any adjoining closets, we can simply knock out the wall between them to create room for the bathroom. Half baths only increase your home’s value by about 10%. A bathroom of this size on average will run around $3,000.

An existing bathroom

Instead of installing a new bathroom somewhere in your home, you can easily extend an existing bathroom. By doing it this way benefits you will get to keep your existing bathroom design as you would only be expanding the size of your current bathroom. This type of installation will run anywhere from $2,000 to 5,000 depending on the size of a change you want to make. 

 Areas for a bathroom addition

Areas for a bathroom addition








An existing bathroom


 Tips for Adding A Bathroom

Plumbing is a crucial part of adding a second bathroom. However, there are several factors to consider including checking the codes in Houston and also having an inspection done is required. 

When installing a door in your new bathroom, it is advisable to add a sliding door or one that swings out. This will make it easier for people to use the new bathroom and also help to maximize the space for fixtures installation.

Fixtures have to be placed strategically close to existing water and water lines which will help to keep construction and plumbing bills down.

Install a macerating toilet system that has a grinding feature to greatly reduce solid waste before pumping it out, which in return helps eliminate clogging. “Upflushing” toilets are a great concept that uses a pump to move waste and is also affordable, time-saving, and a convenient alternative. 

ProTip Task:  Upflush technology helps in managing liquid and solid waste and easily accommodates wastewater from a bathroom sink and a shower or bathtub in one convenient system.

Water Supply

A common challenge that new bathroom owners face is ensuring adequate water supply, both hot and cold. It is therefore very important to assess the capacity of the water heaters and the condition of existing plumbing within the home. 

Are You Ready For Your Bathroom Addition?

Adding a second bathroom will improve the home’s value and create an enjoyable space for the family to use. Our Smart Remodeling LLC team is here to help bring your custom bathroom design to life. We will deal with the challenges of the planning stages to ensure your new bathroom is efficient, user-friendly, and cost-effective.

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