Room Addition Cost in Tennessee

Adding a room to your home in Tennessee costs $30,000 to $120,000 for most residential projects, with the wide range reflecting differences in room type, size, finish level, and how complex the integration with the existing structure turns out to be. Here are the numbers broken down by project type, based on what we see in Lincoln County and the surrounding region.

Bedroom Addition: $35,000 to $80,000

A standard bedroom addition in the 180 to 250 square foot range runs $35,000 to $60,000 in our area for a finished room with closet, drywall, flooring, and painted trim. The upper end of the range applies to larger bedrooms, vaulted ceilings, or premium flooring and trim selections.

If the bedroom addition includes an attached private bathroom, add $20,000 to $35,000 depending on the fixture count and tile work. A bedroom-and-bath combination is the most common room addition we build, and it typically lands in the $55,000 to $90,000 range all-in.

Living Room or Family Room Expansion: $40,000 to $90,000

Expanding a living area or adding a family room, typically 250 to 400 square feet, runs $40,000 to $90,000 depending on size and finish selections. These additions often involve opening up the existing wall to create a connected flow with the current living space, which adds structural work but also improves the functional value of the addition.

Key cost drivers for this type of addition: the number and size of windows (larger windows add light but increase material cost), whether a fireplace or built-in shelving is included, and flooring selection. Hardwood or engineered wood flooring throughout a 350 square foot addition costs more than LVP, but both are common choices we see in this area.

Sunroom or Screened Porch: $20,000 to $50,000

A screened porch addition on an existing slab or new concrete pad runs $20,000 to $35,000 for a standard 150 to 250 square foot space with a shed or gable roof. A three-season sunroom with windows and insulated walls runs $30,000 to $50,000. A fully conditioned four-season room that ties into the home's HVAC system is priced closer to a full room addition at $40,000 to $70,000.

What Drives the Cost Difference Between Projects

• Foundation matching. Adding a slab addition to a slab home is straightforward. Matching a crawl space foundation requires pier and beam or block work that adds to the scope. Homes with unusual foundation configurations can require more engineering at the tie-in point.
• HVAC. A conditioned addition needs heat and cooling. If the existing system has capacity, running new ductwork adds $3,000 to $6,000. If a new unit or mini-split is needed, the cost is higher. Unconditioned additions like screened porches avoid this cost entirely.
• Plumbing. Bedroom-only additions have no plumbing. Adding a bathroom changes the project significantly in terms of rough-in, fixture installation, and tile work. Where the new bath's plumbing ties into the existing lines also affects cost, as longer runs mean more pipe and more labor.
• Exterior material matching. Additions that need to match existing brick, hardy board, or uncommon siding require sourcing the right material to achieve a clean appearance from the outside.

Permit Process and Timeline

A structural room addition requires a building permit through the county building department. In Lincoln County, the permit application, plan review, and approval typically take two to four weeks for a straightforward addition. Construction on most room additions runs six to twelve weeks from permit issuance to completion, depending on the size and complexity.

Inspection stages typically include foundation, framing, rough electrical and plumbing, insulation, and final. We manage all permit paperwork and schedule all required inspections.

Marberry Builds Throughout the Region

Marberry Construction builds room additions throughout Fayetteville, Lincoln County, Giles County, Franklin County, Winchester, Ardmore, Taft, and North Alabama. We are a licensed Tennessee contractor (TN License #77673) and provide free estimates. Call 256-679-8665 or visit our home additions page for more detail.