Veteran-owned. Veteran and military discounts available—ask when requesting your estimate.
Room Additions in San Antonio
Bedrooms, master suites, sunrooms and second-story additions, matched to your existing home by one contractor with licensed in-house trades.
Available 24/7. Call anytime, day or night.
Licensed in-house trades: electrical TECL 31793 · plumbing RMP 46592
Request a Free Written Room Addition Estimate
Tell us the room you want to add and the constraints on the property. Someone from C.S.W. Power Solutions will follow up to scope the addition and put the estimate in writing.
Call 210-880-2864Request A Free Room Addition Estimate
Call 24/7 at (210) 880-2864 or book your estimate to discuss your project.
Texas trade licenses: Electrical TECL31793, Plumbing RMP46592.
Room Addition Services in San Antonio
C.S.W. Power Solutions builds all types of room additions for San Antonio homeowners. Whether you need an extra bedroom, a master suite, a sunroom, or a full in-law suite, our licensed team handles every aspect — from foundation and framing to electrical, plumbing, and all finish work. We match the addition to your existing home's architecture so it looks like it was always part of the original construction.
- Bedroom additions with closets, lighting, and electrical
- Master suite additions with walk-in closet and luxury bathroom
- Sunroom and enclosed patio additions
- In-law suite additions with kitchenette and bathroom
- Home office and study additions
- Second-story additions (with structural engineering)
- Bump-out additions to expand existing rooms
- Foundation engineering and construction
- Roofline matching and exterior finish coordination
- All electrical and plumbing by in-house licensed trades
Room Addition Types in San Antonio
Room additions range from single bedrooms to full in-law suites. Scope depends on the size, type, and complexity of the addition.
Bedroom Addition
- 200–300 sq ft
- Foundation & framing
- Electrical & lighting
- Matching exterior
- 6–10 weeks
Master Suite
- 300–500 sq ft
- Full bathroom & walk-in closet
- Premium finishes
- All trades included
- 10–16 weeks
In-Law Suite / ADU
- 400–600 sq ft
- Bathroom + kitchenette
- Separate entrance option
- Full code compliance
- 12–20 weeks
Scope varies based on size, materials, soil conditions, and project goals. Contact us for a free, detailed estimate.
Why San Antonio Homeowners Choose C.S.W. for Room Additions
Room additions require coordination between multiple trades — foundation, framing, roofing, electrical, plumbing, and finishing. C.S.W. Power Solutions coordinates the required trades, permits, inspections, and schedule with one point of contact and clear written responsibilities for the project.
- General contractor with licensed in-house trades — one company manages your entire room addition
- In-house licensed electricians (TECL 31793) for all wiring, circuits, and lighting
- In-house licensed plumbers (RMP46592) for bathroom and wet bar plumbing
- Structural engineering coordination for foundation and framing
- Exterior matching — roofline, siding, windows, and trim
- Detailed, itemized estimates with labor and material breakdowns
- Veteran-owned and operated since 2016
Our Room Addition Process
Design Consultation
We visit your home, discuss your needs, take measurements, and evaluate structural and site conditions. You receive a preliminary floor plan and scope of work.
Engineering & Estimate
We coordinate structural engineering, produce a detailed estimate with line-by-line costs for foundation, framing, electrical, plumbing, and finishes.
Permits & Construction
We pull all required permits, pour the foundation, frame the addition, install the roof, and build out the interior with our in-house licensed trades.
Final Walkthrough
We walk through the completed addition together, verify all systems, address any punch list items, and ensure the addition seamlessly matches your existing home.
In-House Licensed Trades
Every project by C.S.W. Power Solutions benefits from our in-house licensed trades. Our electricians handle new circuits, lighting, and outlets. Our plumbers manage water lines, drain lines, and gas connections. Need a generator or EV charger as part of your project? We handle that too — all under one contract.
Customer reviews
Read our reviews on Google (opens in a new tab)Room Addition Service Areas
C.S.W. Power Solutions provides remodeling and construction services throughout San Antonio and surrounding communities including Alamo Ranch, Boerne, Castle Hills, Cibolo, Converse, Helotes, Leon Valley, Live Oak, New Braunfels, Schertz, Shavano Park, Stone Oak, and Universal City.
Room Addition FAQ
Do I need a permit for a room addition in San Antonio?
How long does a room addition take to build?
Can you match the addition to my existing home?
What types of room additions do you build?
Do room additions require a new foundation?
Will a room addition increase my property taxes?
Can you add a second story to my home?
Ready to Add Space to Your San Antonio Home?
Get a free, no-obligation estimate from a San Antonio general contractor with licensed in-house trades — electrical and plumbing. One call — one contractor — your new room built right.
Online estimate appointments need at least 24 hours' notice. Need help sooner? Call 24/7: (210) 880-2864.
Prefer to pick a time? Book online.
Books a free on-site estimate consultation at an open time on our Calendly schedule. It is not a repair dispatch — for anything urgent, call us.
Online estimate appointments need at least 24 hours' notice. Need help sooner? Call 24/7: (210) 880-2864.