How Much Does It Cost to Add a Bedroom and Bath in Baltimore, MD? [2026 Data]

Adding living space can be a practical alternative to moving in Baltimore, MD, where many homeowners live in historic rowhomes and established neighborhoods with limited opportunities to find larger properties nearby. Whether you're creating a private primary suite, accommodating a growing household, or improving your home's functionality, the cost to add a bedroom and bath in Baltimore, MD, averages $107,949, with most projects ranging from $39,188 to $122,265.

Final costs depend on factors such as the size of the addition, the type of bathroom being built, and the quality of materials and finishes selected. Baltimore, MD's permitting requirements, aging housing stock, and potential plumbing, electrical, or HVAC upgrades can also affect project costs. Understanding these variables can help you establish a realistic budget before construction begins.

Bedroom and Bath Addition Cost Factors 

Several factors influence the cost of a bedroom and bathroom addition in Baltimore, MD, with the largest expenses tied to the bedroom's size, the type of en suite bathroom, and the materials selected for the project. Demolition, site preparation, and any structural, plumbing, or electrical modifications can also add significantly to the overall cost.

Size of Primary Bedroom

A bedroom and bathroom addition costs an average of $165 per square foot. This rate can range from $85 to $230 per square foot, depending on the features you include and the finishes and materials you choose.

The footprint of a primary bedroom alone can range from 200 to 400 square feet. A primary bathroom can add another 50 to 200 square feet on top of that. Larger additions require higher material and labor costs, as detailed in the table below.

Type of En Suite Bathroom

Bathrooms are far more expensive to build on average than bedrooms, so expect the cost to add a bathroom to take up the majority of your project budget. If you're planning an en suite, understanding what an en suite bathroom is can help you determine which layout best fits your needs.

Your costs will vary significantly depending on the type of bathroom you want for your addition, as well as factors such as standard master bathroom sizes. Costs per bathroom type in Baltimore, MD, break down as follows:

Materials

A primary bedroom requires a wide range of materials, from lumber for framing and support to a concrete foundation, siding, roofing, drywall, paint, doors, windows, electrical and plumbing equipment, and flooring. Expect to pay anywhere from $10,450 to $104,500 on materials alone, or $41,800 on average.

Demolition and Prep

Before construction can begin on your new bedroom and bathroom addition, the space must be completely cleared of landscaping features. Expect demolition and prep to cost between $1.35 and $2.10 per square foot.

Home Addition Pro Costs

The cost of hiring a home addition pro in Baltimore, MD, includes more than construction labor alone. Permits and inspections, licensing and insurance requirements, sales tax, and project management or general contractor fees all contribute to the total cost of the project.

Labor

Home addition labor in Baltimore, MD, is often managed by a general contractor charging $50 to $150 per hour, while specialty trades such as electricians charge $50 to $100 per hour and plumbers charge $45 to $200 per hour. Labor is one of the largest project expenses and directly affects how long an addition takes.

Permits and Inspections

Baltimore homeowners should budget for building permits, trade permits, and required inspections throughout construction. Permit costs vary based on project size and scope, but additions involving structural, electrical, and plumbing work often require multiple permits and inspections before final approval.

Licensing, Insurance, and Certification

Licensed contractors carry insurance, bonding, and required Maryland credentials, which are reflected in project pricing. Hiring properly licensed professionals helps ensure work meets local building codes and inspection requirements, reducing the risk of costly corrections during or after construction.

Sales Tax

Maryland imposes a 6% sales tax on many construction materials and taxable services used in a home addition project. Depending on how a contractor structures the estimate, these taxes may appear as separate line items or be included in material costs.

Additional Pros to Consider Hiring

A bedroom and bathroom addition often requires multiple specialized professionals to ensure the project is safe, code-compliant, and properly integrated with your existing home.

• Architect: Architects in Baltimore, MD, charge $125 to $250 per hour or 5% to 20% of total construction costs. They develop plans, create permit-ready drawings, and help determine whether you need an architect for an addition based on the project's size and complexity.

• Structural Engineer: Structural engineers in Baltimore, MD, charge $100 to $200 per hour or $550 to $2,000 per project. They evaluate foundations, load-bearing walls, roof structures, and framing plans to ensure the addition can safely support new loads.

• Plumber: Plumbers in Baltimore, MD, charge $45 to $200 per hour. They install water supply lines, drain pipes, fixtures, and venting systems for the new bathroom and may upgrade existing plumbing to accommodate increased demand.

• Electrician: Electricians in Baltimore, MD, charge $50 to $100 per hour. They install wiring, outlets, switches, lighting, exhaust fans, and dedicated circuits while ensuring the addition meets current electrical code requirements.

Does Adding a Bedroom and Bath Increase Home Value?

In Baltimore, MD, adding a bedroom and bathroom can make a home more functional for current occupants while also improving its marketability when it's time to sell. If you're wondering whether adding a bedroom increases home value, these projects often provide a meaningful boost, though they don't recoup their full construction cost. A primary suite addition delivers an average 54% return on investment (ROI), while a bathroom addition delivers an average 56% ROI.

Additional living space is especially valuable in Baltimore, MD's many rowhomes and older properties, where bedroom counts and bathroom availability can be limiting factors for buyers. Beyond resale value, a new bedroom and bath can improve privacy, create a more balanced layout, and increase day-to-day comfort. Industry research also found that primary suite additions received a perfect homeowner satisfaction score, highlighting the long-term lifestyle benefits these upgrades can provide.

How Angi Gets Its Local Cost Data 

To help homeowners plan their next project, Angi provides readers with carefully researched cost data and upholds strict editorial standards. We start with national average project costs, which we collect by analyzing competitor information, retailer material costs, and input from professional contractors. We then apply local price index data to calculate location-specific estimates that reflect what homeowners typically pay in their local area. To do that, we use data from the U.S. Bureau of Economic Analysis (BEA), including its Regional Price Parities (RPPs), which measure price differences across cities. This helps us account for differences in labor, materials, and overall cost of living, so estimates in higher- or lower-cost areas better reflect real-world local pricing.

Every estimate undergoes a thorough editorial review to verify accuracy, consistency, and alignment with observed market conditions.

Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.