How Much Does a Second Story Addition Cost in Fort Worth, TX?
Straight answers on home additions from a Fort Worth general contractor — engineering first, then a fixed price before any work begins.
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A second story addition in Fort Worth costs $185–$400+ per square foot, with most full projects landing between $60,000 and $300,000+ depending on size, structure, and finishes. Counterintuitively, smaller additions usually cost more per square foot, because engineering, roof work, and stairs are fixed costs spread over fewer feet.
Why the per-square-foot range is wide
Every second story starts with the same fixed scope regardless of size: a structural engineer’s evaluation of the existing foundation and framing, roof removal and rebuild, a new staircase, and tying new plumbing, electrical, and HVAC into the existing systems. On a 300-square-foot addition those costs concentrate — pushing you toward $400/sf. Spread over 800–1,000 square feet, the same fixed costs dilute toward the $185–$250/sf end. Finish level, bathroom count, and how much of the first floor must be reworked move the number from there.
What’s included in a Birdseye addition
Birdseye manages the full sequence as your general contractor: engineering coordination, design and material selections, permits pulled directly with the city, foundation verification, framing, roofing, and licensed plumbing, electrical, and HVAC trades — all under one fixed-price contract with documented change orders. A dedicated project manager sequences the trades so your home is weathertight again as fast as possible.
Budgeting realistically
For a master-suite-sized addition (400–600 sf), most Fort Worth homeowners should plan in the $100,000–$200,000 range; a full second floor on a modest ranch can reach $300,000+. Get the engineer’s verdict early — it defines what your foundation can carry and is the first step of any honest quote.
Planning a project? See our main floor and 2nd story additions page for services, pricing, and recent work.
Frequently Asked Questions
Why does a smaller addition cost more per square foot?
Engineering, roof demolition and rebuild, stairs, and system tie-ins cost roughly the same at any size. Fewer square feet means those fixed costs concentrate, raising the per-foot price.
How long does a second story addition take?
Most run several months from permit to walkthrough depending on size and weather. The critical stretch is roof-off to dried-in, which your contractor should compress as tightly as possible.
Do I have to move out during a second story addition?
Not always. Many families stay through most of the build; the disruptive window is the roof and structural phase, when some choose to be away for a few weeks.
Does a second story addition require an engineer?
Yes. An engineer must confirm the foundation and structure can support the load and design the structural plan — it's required for permits and it protects the whole investment.
Let’s price your project
A free walkthrough and a fixed-price scope for your exact project — no pressure, no guesswork. Serving Haslet, North Fort Worth, Northlake, Westlake, Justin, Roanoke, Keller, Southlake, Trophy Club, Colleyville, and North Richland Hills.
Request a Free EstimateCall (817) 800-6920