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A room addition expands the footprint of a home by building onto the existing floor plan. Room additions typically take less time, money and work than a complete home remodel. Common add-ons include a home office, an expanded master bedroom suite, an additional bathroom, a walk-in closet or a guest room. Room additions can simple or customized with high-end designs and finishes. Costs per square foot vary by geographic region.

Price per square foot

Most contractors offer an approximate price per square foot when bidding room addition projects. They determine how large the project is, what foundation work will need to take place, what type of frame needs to be built, whether the project requires extensive plumbing and electrical work, and how complex the job is. Here are some examples of construction and finish costs per square foot from different parts of the country.

Renovations Your Way in Slidell, Louisiana

  • 200-square-foot room addition: ~$10,000

  • $50 per square foot is the starting price for a standard room addition with contractor grade finishes.

  • The average addition in Slidell, Louisiana, is a 10x19 room. The price per square foot includes the foundation, framing, drywall, interior and exterior paint, and standard flooring such as bedroom carpet.

  • Customers supply any necessary fixtures.

  • Pricing can increase $8,000–$15,000 or more, depending on the finishes.

YYB Construction in San Jose, California

  • 300-square-foot, upscale master bedroom expansion: ~$78,000

  • $260 per square foot for a master bedroom and master bath expansion in Fremont, California.

  • The price per square foot included foundation work, framing, drywall, stucco, interior and exterior paint, and flooring. The plumbing system was existing so the company extended it to the new bathroom.

  • The project took approximately five weeks.

  • The customer paid an additional $5,000 for bathroom fixtures and flooring materials.

  • 300-square-foot luxury kitchen addition: $81,000

  • Approximately $270 per square foot for the expansion in San Francisco.

  • The price per square foot included foundation work, framing, drywall, exterior finish, interior and exterior paint, and extending the plumbing and electrical system.

  • The customer paid for upgraded finishes, and YYB Construction installed them. This labor was included in the price per square foot.

  • The project expanded the existing kitchen by 300 square feet to create the client’s ideal space.

  • The total project time was less than six weeks. One week was spent preparing for and pouring the foundation, one and a half weeks were spent framing, and two and a half weeks were spent finishing.

  • The client selected top-of-the-line finishes such as white marble countertops, high-end wood cabinets and floors, and top-tier appliances such as a $7,500 refrigerator. The floors cost an additional $20,000—the client purchased floors separately, and YYB Construction installed them. The labor was included in the price per square foot of construction.

Architectural plans

Some room additions require architectural plans to properly equip contractors with building plans and to meet local building codes. Some architects charge a percentage of the total construction costs for plans, some charge a flat rate, and some charge by the hour.

Regional costs

The total price of a room addition depends on regional labor costs, business overhead and other area costs. Room additions in expensive cities such as Manhattan or San Francisco cost more because of higher labor costs and costs of doing business than smaller areas or cities with a lower cost of living. In addition, the materials used to build a home vary state by state, says RJ Nassar of Opus One Design Build. Homes in Florida are often built from concrete block while homes in Georgia are built on a concrete foundation with wood framing. The costs per square foot, just for the shell of a room addition can be $10–$20+ more per square foot, depending on the region, what materials are required, and what type of skilled laborers (masons versus carpenters) are required.

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