How Much Does It Cost to Add a Bedroom and Bath in 2025?
The average cost to add a bedroom and bath is $103,300
Homeowners spend an average of $103,300 when adding a bedroom and bath, with most projects ranging between $37,500 and $117,000.
Costs rise or fall in proportion to the size of the bedroom and bathroom, local labor rates, and the complexity of the design.
Hiring experienced contractors, structural engineers, and designers ensures a safe, code-compliant addition that seamlessly integrates into your space.
This article was updated using automation technology and thoroughly reviewed for accuracy by HomeAdvisor Editor Ryan Noonan.
Most homeowners spend an average of $103,300 to add a bedroom and bath, with projects ranging between $22,500 and $150,000, or $160 per square foot. Your total costs will largely depend on the size, design, and labor requirements of your new addition. Adding a bedroom and bathroom can create more living space and increase the home's resale value. Use this guide to plan your budget and lean on experienced pros to bring your vision to life—and add meaningful value to your home.
Primary Suite Addition Cost per Square Foot
The larger your addition, the more you’ll pay. Primary suite additions cost an average of $160 per square foot, with rates ranging from $80 to $220 per square foot.
| Total Size (Square Feet) | Average Cost |
|---|---|
| 250 | $20,000–$55,000 |
| 300 | $24,000–$66,000 |
| 400 | $32,000–$88,000 |
| 460 | $36,800–$101,200 |
| 560 | $44,800–$123,200 |
| 600 | $48,000–$132,000 |
Adding a Bedroom and Bathroom Cost Factors
Square footage, material quality, and design complexity all contribute to the total cost of your bedroom addition. Bigger footprints and high-end finishes push costs toward the top of the range.
Cost to Add a Bathroom
The cost of adding a bathroom depends on the type of bathroom you plan to build. Average costs and their accompanying features are as follows:
Powder room: $5,000 for a small space with a sink and toilet.
Half bathroom: $7,500, including a sink, toilet, and modest finishes.
Full bathroom: $10,000, featuring a sink, toilet, and shower or bathtub.
Luxury bathroom: Ranging from $15,000 to $30,000 or more, with high-end fixtures, premium materials, and custom features.
Labor
Plan to bring in several licensed professionals to handle installation and ensure that every phase meets local code requirements. Below is what you can expect each specialist to charge.
General Contractor
A general contractor near you will take 10% to 25% of the overall budget, or $10,330 to $25,825. In return, the general contractor handles the heavy lifting—planning, scheduling, hiring subs, pulling permits, and keeping the work on-spec and on-time—so you don’t have to juggle every detail.
Structural Engineer
Structural engineers charge between 1% and 10% of the total project budget. They assess the foundation, framing, and load-bearing elements to ensure that your addition is safe and structurally sound.
Interior Designers
Interior decorator and interior designer services cost an average of $2,100 to $14,700. They help transform the space’s layout, aesthetics, and functionality.
Cost of Interior Finishes
The finishes you choose for your space significantly impact total costs. Expect to pay the following fees for interior finishes in your new bedroom or bathroom.
Drywall and Paneling
Hanging drywall costs an average of $2,100, with costs varying based on the area’s size.
Installing Doors and Windows
Installing windows costs an average of $1,200 each, and installing interior doors costs an average of $800 each.
Flooring
Laying flooring costs an average of $3,200, but costs can vary significantly depending on the type of flooring material chosen and the size of the area being covered.
DIY vs. Hiring a Remodeling Pro
While minor updates, such as painting walls or replacing light fixtures, can be DIY projects, adding a primary bedroom and bathroom is a complex undertaking that requires professional expertise. Hiring a contractor experienced in primary suite additions ensures the project is completed safely, complies with local building codes, and aligns with your vision for the space.
Work with a licensed remodeling contractor to keep the project on schedule, on budget, and up to code. When you’re ready, request quotes from a few local pros to see who best matches your goals.
Does Adding a Bedroom and Bathroom Increase Home Value?
Adding a bedroom and bathroom significantly increases a home's value. Building a primary bedroom suite offers a 60% return on investment(ROI), so you'll recoup more than half the cost of your project when you sell your home. An additional living area not only helps a home sell faster in the future, but it also makes the home more comfortable and functional while you still live there.
How HomeAdvisor Gets Its Cost Data
No place is more important than your home, which is why HomeAdvisor connects homeowners with local pros to transform their houses into homes they love. To help homeowners prepare for their next project, HomeAdvisor provides readers with accurate cost data and follows strict editorial guidelines. After a project is complete, we survey real customers about the costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Frequently Asked Questions
Building up is often cheaper than building out because it involves adding square footage without requiring a new foundation. A second story often needs only additional framing and structural support. That said, the smarter option still depends on your home’s current structure, local permitting fees, and the location of existing plumbing lines. If ground conditions or zoning make a horizontal addition tough, going vertical can save money, and vice versa when site work is simple.
The priciest line items are almost always the foundation, framing, and new plumbing. You’ll need a solid foundation and sturdy framing before any walls go up, and running fresh supply and drain lines for a tub or shower drives costs even higher. Because these steps require skilled labor and high-quality materials, they consume the largest share of the budget and warrant extra consideration in your planning.
Timelines vary, but plan on about three to four months for a simple suite and up to six months—or even a full year—for a large, highly customized build. Existing structures, weather conditions, and additional plumbing or ventilation work can either speed up or slow down the process. Build a little cushion into your calendar and talk through the schedule with your contractor before work begins.
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