Residential · New additions
Home additions in Plano, TX
More room without moving, matched to the house you already love.
Every addition modeled in 3D before we break ground
What counts as a home addition?
A home addition adds living space to the house you already own: a primary suite, a family room, a covered patio or an outdoor kitchen. AllTex Construction designs and builds additions in Plano and North Dallas, tying the new foundation, roof and finishes into your existing home so it looks original.
Who it's for
Homeowners who like their neighborhood and their lot, and need more room than the current floor plan gives them.
Who it isn't for
If you only need to borrow a little space, a remodel that opens up existing rooms can cost far less than an addition. We'll tell you if that's the better route.
What a home addition with AllTex includes
- 3D model firstSee the addition on your house before plans are final, and change it while changes are free.
- Plans, engineering, permitsBlueprints, structural stamps and the city permit, handled for you.
- Foundation built for our soilFoundations engineered for North Texas clay and tied into the existing slab.
- Matched roof and exteriorRoof lines, brick, stone and trim matched to the original house.
- Finished inside and outDrywall, flooring, paint, lighting and trim by our own crews.
What kinds of additions do we build in Plano?
Most Plano and North Dallas additions fall into a few groups. Each has its own price and timeline, so it helps to know which one you're asking about.
- Primary suite with bedroom, closet and bath
- Family room or game room off the back of the house
- Covered patio or pergola with a tongue-and-groove ceiling
- Outdoor kitchen and fireplace
- Raised decks and stairs
Why North Texas clay matters for an addition
Plano sits on expansive clay that swells when wet and shrinks in drought. A new foundation that isn't engineered and tied in correctly can move differently from the original slab, which shows up later as cracks where the old house meets the new room.
We use engineered foundation plans for every addition and treat the joint between old and new as the most important line on the drawings.
From first call to finished job
- Step 1
Visit and measure
We walk the house and lot, check setbacks and easements, and listen to what you need.
- Step 2
3D model and price
A 3D model, then plans and a written price once the design is right.
- Step 3
Permit and build
City permit, foundation, framing, roof, MEP, inspections.
- Step 4
Finish and walk
Interior and exterior finishes, final inspection and a walk-through with you.
How much does a home addition cost in Plano?
Estimates from AllTex are free and written, so you can compare them line by line. Bring us a competitor's written bid and we'll try to beat it.
| Ground-floor addition, per square foot (Dallas) | $120 – $240 |
|---|---|
| Second-story addition, per square foot (Dallas) | $200 – $400 |
| Primary suite addition (Dallas) | $80,000 – $150,000 |
| Home addition, per square foot (Plano) | $106 – $213 |
Market ranges from published guides, not an AllTex quote. Plan a 10% to 15% contingency on any addition. Your price is confirmed in writing before work starts.
Sources: Block Renovation, Dallas home additions guide (April 2026); HomeBlue, Plano home addition cost (2024)
Work from our crews
Questions people ask us
How much does a home addition cost in Plano?
Published figures put Plano home additions at about $106 to $213 per square foot, and Dallas ground-floor additions at about $120 to $240 per square foot. Second-story additions cost more. AllTex gives a free written estimate for your project.
Do I need a permit for a home addition in Plano?
Yes. A room addition in Plano needs a building permit, and many neighborhoods also require HOA architectural approval. AllTex Construction prepares the plans and handles the permit.
Can you match my existing brick and roof?
We match brick, stone, roof lines and trim as closely as available materials allow, and we show you the match on the 3D model before construction starts.
How does clay soil affect a home addition?
North Texas clay expands and shrinks with moisture, so an addition needs an engineered foundation tied into the existing slab. Done right, the old and new parts of the house move together.
Tell us what you're building
Estimates are free. Call, or send a few details and we'll set up a time to walk your project.