Home Additions & ADUs in Prosper & Celina

Prosper and Celina are among the fastest-growing communities in North Texas, and many families who moved into newer homes there now need more room: a primary suite, a home office, a playroom or a place for aging parents. 4 Pillars Construction LLC designs and builds home additions and ADUs in Prosper and Celina, managing the engineering, permits and construction from start to finish.

We are a woman-owned general contractor led by engineer Mary Emadi. We act as both your builder and your consultant, so you get straight answers about what makes sense for your lot, your budget and the way you live.

What We Build in Prosper and Celina

Room additions: bedrooms, primary suites, home offices and family rooms.

ADUs (accessory dwelling units): detached guest houses, backyard cottages, in-law suites and living space above a garage, each with its own kitchen, bath and entry where the rules allow.

Garage conversions: turn an existing garage into finished living space.

Second-story additions and bonus rooms.

Planning Your Addition or ADU

What you can build depends on your lot and the rules that apply to it. Many newer neighborhoods in Prosper and Celina have HOAs with their own design and approval rules, on top of the zoning and building requirements of the Town of Prosper or the City of Celina. Before design starts, we review your lot, setbacks, utilities, HOA rules and city requirements, so you know what is possible before you invest in plans.

1. Feasibility: we check your lot, setbacks, HOA rules and city requirements.

2. Design and engineering: plans and structural engineering so the addition fits your home and passes review.

3. Approvals and permits: we review your HOA’s rules and help you prepare what’s needed for approval, handle the permit applications and schedule the required inspections.

4. Construction: foundation, framing, roofing, electrical, plumbing, HVAC and finishes, matched to your existing home.

Common Questions

Can I build an ADU in Prosper or Celina? It depends on the zoning rules for your lot, your setbacks and utilities, and any HOA restrictions. We check all of this before design starts.

Will the addition match my house? That is the goal. We match rooflines, brick or siding, windows and interior finishes so the new space looks like it was always there.

Do I need my HOA's approval? In most HOA neighborhoods, yes. We review your HOA’s rules and help you prepare what’s needed for approval.

How much does an addition or ADU cost? It depends on size, finishes and foundation work. After a site visit we give you a detailed estimate. We accept credit cards and offer financing.

Ready to add space? Call or text 408-406-5731 or contact us. See all of our services in Prosper and Celina, or learn more about our additions and ADUs.