How Much 20x20 Room Addition Cost

[BLOG] Published: 2021-06-04 - Updated: 2023-05-31

How Much  20x20 Room Addition Cost


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How Much Would a 20x20 Room Addition Cost?

Are you feeling your living space cramped up? Or have a growing family that needs more space? If so, then room addition can help add square footage to your living space. Perhaps you might be thinking about 20x20 room addition cost since it is the most common size many real property owners commonly request. 


Whether it's an extra bedroom, a nursery, a family room, or just a kids' playroom, having ample living space is a great idea for a growing family. 

While such projects would require some significant amount of money to get the project done, it pays off in the long run. After all, it allows you to incorporate extra square footage while adding extra customized space, resulting in a substantial ROI. 

Is a Room Addition Worth It?

Of course, it's worth it!

Instead of going through time-consuming packing and moving into another house, which is also a costly undertaking, room addition provides the shortest way to getting an extra living space. Additionally, you'll also pay for packing and moving to a new home. 

But, with a room addition, you can avoid the hassle and get another room incorporated at an affordable cost, and also allowing you to continue living where you've loved to live for years. 

How to Determine the Cost of 20x20 Room Addition

Determining the cost of room additions in Houston isn't as complicated as many homeowners perceive. Plus, there are no hard and fast rules to follow when creating a budget for your 20x20 room construction. 


HomeAdvisor estimates that the typical range for a 20x20 room addition is $48,000, but you can expect to pay as much as $80,000 on high-end and as low as $15,000 on low-end. Of course, the total room addition costs will vary depending on your home location, room size, labor expenses, and materials used.

Experts at Smart Remodeling also recommend that you consider other basic costs that often influence the overall budget of the room addition project. Once you check and clear with the local state's permit requirements and homebuilding restrictions, consider the following expenses. 

Demolition cost – Demolition involves ripping off the roof, excavation, and everything else involved in site preparation. Demolition cost ranges between $1,200 and $4,000 depending on the scope of work done.

Plan and design cost – You may need to pay a professional architect to plan and craft a design that fits the existing structure. Designing the addition may cost somewhere between $2,000 and $8,000, based on the expertise and qualification of the architect. 

Fixtures expenses – You may need a budget for buying and installing fixtures. Your room addition will need windows which will cost anywhere from $80 up to $1,500, and you'll spend about $900 on each door. Ceiling molding cost ranges between $4 and $15 per square foot. 

Foundation preparation – The foundation cost will depend on the project size and materials used and can cost anywhere between $4,000 and $12,000. Flooring can cost up to $5,000 based on the type of materials used. 

Roofing expenses – The roofing cost varies depending on the type of roofing material you choose. The average cost for roofing ranges between $80 and $100 per sq. ft. you may also need a budget for the roof, support beams, and other roofing fixtures. 

Contingency budget – Every remodeling project is at risk of unexpected costs. Experts recommend you set aside some cushion money (about 10 to 20 percent) to cover any unforeseen situation during construction.

Pro-Tip Takeaway: The average 20x20 room addition cost is $48,000 but prices can range between $15,000 and +$80,000.

What Types of 20x20 Room Addition Can You Opt For?

20x20 room additions come in different types and sizes, from stretching your master bedroom or expanding the living area to adding a family room. However, there are vital steps to follow during the room addition process to ensure you keep costs as low as possible. 

  1. Take time to find a qualified room addition contractor with the right skills and experience to handle your project professionally. Check out reliable companies like Smart Remodeling with a good track record and a great reputation in the industry. 
  2. Develop a realistic budget along with your expectations and get everything in writing. That will serve as your reference in case you face any unexpected cost issues down the line. 
  3. Ensure you understand the company's rules for making adjustments during project execution. While you should try to avoid mid-project changes, it is essential to know what to expect. 
  4. Follow up on the progress of the project to ensure everything is running as planned. 

With that in mind, check out some of the most common room addition types with their relevant cost estimates from Smart Remodeling.

Master Bedroom Addition 20x20 Room Addition Cost

So how much will a master suite addition 20x20 cost? Although every project has a set of unique requirements, the national average cost to build a master bedroom is $62,500, but prices range between $25,000 on the low-end and up to $100,000 and more for a spa-like design. You will also pay more if you select high-end materials and finishes.


Averagely, a master bedroom addition costs about $140.00 per square foot. You can expect to pay from $80 - $200 per square foot, based on your material choice and preferences. A custom master bedroom has a master bathroom, walk-in closet, and even a sitting room for luxury homes. The size of a typical master suite ranges from 200 to 400 sq. ft., with a bathroom taking up to 200 sq. ft. 

The average cost of adding a bathroom to your master suite is $42,000, but you can expect to pay anything between $18,000 and $48,000, depending on your material preferences. The price can increase to over $80,000 for high-end finishes. You can also spend up to $1,400 to build a bathtub and pay about $3,000 to install a shower and tub. 

Pro-Tip Takeaway: The cost of a master bedroom addition varies depending on your budget and the type of finishes and materials you choose.

20x20 Family Room Addition Cost

There are many reasons you might need some extra space in your home; maybe you're expecting a new baby, someone is moving in, or the kids need their own privacy. So, just how much would a 20x20 room addition cost? Several factors, such as the room's location, the services you choose, and the project scope, will influence the overall cost of a home addition. 


Adding a family room to your house is particularly important as it helps create enough space to accommodate everybody. Additionally, it adds luxury to your living space, increases the value of your property, and can house additional family members. 

A family room is usually built to meet the family needs; hence, it includes a free space to chill out, an entertainment area, and ample storage. Reliable contractors like Smart Remodeling can craft a family room to suit your size and shape specifications.

According to HomeGuide estimates, homeowners pay an average of $48,000 for a 20x20 family room addition. For a 400 sq. ft., you can expect to spend between $30,500 and $85,000, which translates to approximately $89 - $230 per square foot. 

These costs cover various details, including electrical work, roofing, insulation, exterior walls, and foundation. Lighting fixtures, windows, and flooring are also included in the total price of the family addition.  However, remember that you'll need an extra budget for a new bathroom if it's incorporated into the family room. 

Pro-Tip Takeaway: Living room addition is important as it provides extra space to make everybody in your home comfortable. The cost of this addition depends on the service you choose, the type and scope of the project, and the place where you want to build the room.

20X20 Living Room Addition 

Adding a living room to your house is an excellent way to not only enhance comfort and style but also double the square footage of your living space.  Although it's relatively smaller than a family room, a living room is formal and offers great style and unmatched comfort. Most living rooms are often built of top-quality materials like marble floors and appealing features. 


A 20x20 living room addition can cost as low as $35,000 and as much as $60,000. There are multiple ways to enhance the beauty and function of your living room. You can get started with a standard room addition that involves building a separate extra structure and joining your home. 

The national average cost of standard room addition is $42,000, but you can expect to pay $21,000 to $64,000 or more, depending on your location and the size of the room. You can also add more unique shapes to your living room to make it lively and more appealing. 

Our experts at Smart Remodeling will help you build a unique space by integrating the best shapes like octagon and hexagon to create a perfect view of your home.

Pro-Tip Takeaway: Creating a great living room in your home is a great way to enhance comfort, style, and function. Smart Remodeling professionals will help build a perfect living room that caters to your family's needs. 

Start Your Project Today

Want to start your project today? We've got all your needs covered! No matter how small or big your house is, our team of talented experts can create seamless room additions that blend with your house's architectural design to give you the space you need. 

Contact us today and get your project done by top-industry experts


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