A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Room Addition Contractor Across Converse
Room additions in Converse typically cost between $185 and $310 per square foot for site-built work, with most 300 – 500 sq ft projects landing in the $60,000 – $140,000 range once foundation, framing, mechanicals, and finishes are included. That’s a real number you can budget against, not a teaser price that shifts when the first invoice arrives. Our crews work in Converse neighborhoods off FM 1516, along Toepperwein Road, and through the Gibbs Sprawl corridor every week, so we know what these lots demand before we ever knock on your door. Call (430) 258-2928 and we’ll put a written price in front of you before any work starts.
Why Benson ADU San Antonio Is Converse’s Preferred Room Addition Contractor Company
Converse homeowners tell us the same thing over and over: they got a verbal estimate from another contractor, signed something vague, and then watched the final bill climb past what they were quoted. That doesn’t happen with us. Every project gets a written price before work begins, and it stays that way. No change orders slipped in after framing starts, no “unforeseen conditions” add-ons that double your cost.
Troy Eastman, who leads our team, built Benson ADU San Antonio around one idea: if we can’t put it in writing, we don’t ask you to pay for it. That means a line-item estimate with material costs, permitting fees, and labor broken out so you can see exactly where your money goes. It means background-checked, uniformed technicians on your property in Converse, not day-laborers whose names you never learn. And it means a live person answers the phone when you call, day or night, every day of the year.
We’re part of the Relay Home Co. family, founded in 2006, and every Converse project carries the 365-Day Done Right Promise. If something isn’t right within a full year, we come back and make it right. That’s a written guarantee, not a handshake.
Room Additions in Converse
Room additions are how a Converse homeowner turns an underbuilt 1970s lot into a home that actually fits the people living on it. Whether you’re adding a primary suite off the back of a brick veneer rancher near Converse North Park or building out a home office on a newer subdivision lot west of FM 78, the work involves foundation tie-in, framing, roof integration, electrical and HVAC extension, and a finish that matches your existing home. The permit process in Bexar County is the part that trips up homeowners who hire the wrong contractor, and it’s the part we handle from day one.
Most room addition permits in Converse require a site plan, a structural engineer’s letter for wind load and uplift, and depending on the lot, a septic or sewer capacity review. You won’t see a cheap quote from a pickup-truck contractor include any of that, because they’re not planning to pull permits in the first place. We pull permits on every job, and the written quote includes the permit costs, inspection scheduling, and the engineer’s report. You don’t chase paperwork. We do.
Septic-era lots and what they do to a room addition
In older Converse neighborhoods east of FM 1516, original 1970s septic systems limit room addition size unless homeowners invest in aerobic upgrades. Add a bedroom and a bathroom to a home that’s still on a 45-year-old leach field, and the county wants proof the system can handle the new load. That evaluation, plus any required upgrade, can add $8,000 to $25,000 to the project before a single wall goes up. We flag this up front. A contractor who doesn’t mention it is setting you up for a failed final inspection and a retrofit bill you didn’t plan for.
What a compliant Converse quote includes
A real line-item quote for a room addition in Converse lists the structural engineer’s wind-load letter, the permit fee, the septic or sewer evaluation, the tie-in flashing where the new roof meets the old, and the insulation and HVAC sizing for our summer cooling loads. A cheap quote leaves those line items off because the contractor has no intention of doing them. When the county inspector asks for the documentation, the homeowner is the one who pays.
Modular Home Addition in Converse
Modular home addition means we build your new space as factory-produced panels or modules, then assemble and finish them on your Converse lot. This isn’t a mobile home. These are code-built, engineered units that arrive with documentation, get craned or paneled into place, and get tied into your foundation, roof, and utilities. For a homeowner who wants a faster build schedule and fewer weather delays during our stormy spring months, modular is a strong option.
We build with brands that have wind-load documentation accepted by Bexar County inspectors, including Abodu and Cover. That matters because Converse sits in a 110 mph wind zone. A modular addition from a brand without that documentation will stall at plan review. Ours don’t.
How septic-era lots affect modular additions
A modular home addition still has to meet the same septic capacity rules as a site-built one. On a quarter-acre lot off Gibbs Sprawl, our crew tied a James Hardie-clad room addition into a 1978 brick veneer home, and we had to coordinate a septic capacity evaluation before pulling permits. The original system couldn’t handle the extra bedroom and bath under the county’s accessory dwelling rules, so the capacity review was the first document the county wanted to see. The addition itself went up fast. The paperwork is what required local knowledge.
HVAC sizing for Converse heat loads
The hot, humid subtropical climate means your modular addition needs an HVAC system sized for Converse’s cooling demand, not a default unit that works fine in Ohio. We spec the cooling load based on the room’s orientation, window count, and insulation value, then put that number in your written quote. Undersized units turn a new room into a sweatbox by June. Oversized units short-cycle, spike humidity, and rot drywall. Neither happens on our watch.
Trusted Brands We Service in Converse
Benson ADU San Antonio is authorized to build with and source from residential brands including Tuff Shed, James Hardie, Abodu, and Cover. Why does brand access matter for a Converse room addition? Because Bexar County plan reviewers want to see wind-load documentation from the manufacturer, not a note from a contractor saying “this will hold.” James Hardie provides engineered wind-load data for its cladding and wall assemblies. Abodu and Cover provide full structural documentation on their modular systems. We stock parts and materials for Converse projects so we’re not waiting on a distributor in San Antonio when your permit review or inspection needs a technical submittal.
Common Room Addition Contractor Problems We See in Converse Homes
- Septic capacity ignored until final inspection. A contractor builds a room addition without verifying septic capacity and the county flags it at final inspection, forcing a costly aerobic system retrofit. We run the septic evaluation before permits are ever pulled.
- Wall assemblies without wind-load documentation. Using off-the-shelf wall assemblies without wind-load documentation from brands like James Hardie or Plant Prefab fails the Bexar County wind rating checklist and delays the certificate of occupancy. We specify documented assemblies from the first line item.
- Missing structural engineer’s letter for roof tie-downs. A cheap quote skips the structural engineer’s letter for wind uplift on the roof tie-downs, which an insurance adjuster later cites to deny a storm-damage claim. Our quotes include that letter every time.
- Flash floods and poor drainage grading. Converse’s occasional flash floods mean a room addition slab needs proper elevation and drainage grading away from the existing foundation. A pad poured too low sends water toward your house instead of away from it, and you’ll find the mold before the contractor returns your call.
Pricing for Room Addition Contractor in Converse, TX
Site-built room additions in Converse run $185 – $310 per square foot, depending on finishes and whether you need a kitchen or bathroom in the new space. A 400 sq ft primary suite addition typically lands between $74,000 and $124,000. Modular home additions in Converse typically run $150 – $240 per square foot for the factory-built portion, with site work, foundation, and utility connections adding $30,000 to $70,000 depending on the lot. If your Converse lot is on an original septic system, add $8,000 to $25,000 for an aerobic upgrade if the county requires it. Call (430) 258-2928 for a written, line-item quote on your specific project. The estimate is free, and the price won’t move once you approve it.
We Also Serve Cities Near Converse
Our room addition and ADU crews work throughout Converse and the surrounding communities including Room Addition Contractor in Converse, Universal City, Schertz, San Antonio, and Bulverde. If you’re in any of those areas, the same written-price guarantee and 365-Day Done Right Promise applies. This page is written for Converse homeowners, but our team covers the whole corridor.
Serving Converse, TX - Our Local Coverage Area
We’re based in the Converse area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Room Addition Contractor in Converse
Yes, if your Converse lot is still served by a septic system, Bexar County requires a septic capacity evaluation before a room addition permit is issued, especially if the addition includes a bedroom or bathroom. We coordinate the evaluation before we pull permits, and our written quote includes the cost so you’re not paying it out of pocket at plan review. Call (430) 258-2928 for an exact quote on your lot.
Converse room additions must meet a 110 mph wind speed rating under current Bexar County code, including roof tie-downs, wall-to-foundation connections, and cladding attachments. We specify wall assemblies and cladding with manufacturer documentation that satisfies the county’s wind rating checklist, and the engineer’s letter is included in every quote.
Abodu and Cover are the modular home addition brands we build with that carry wind-load documentation accepted by Bexar County inspectors. If you bring us a different brand, we’ll review its documentation before you commit. A modular system without that paperwork will stall at plan review and you’ll lose weeks. Call (430) 258-2928 and we’ll tell you what’s workable for your Converse lot.
Documented wind-load compliance gives your insurance company a written record that your room addition was built to the county’s wind rating, which can support a lower premium and gives you a strong position in a storm-damage claim. Without the engineer’s letter and manufacturer documentation, an adjuster can cite the missing paperwork as a reason to deny or reduce a claim. That documentation is in every project we complete in Converse.
After framing and siding, a Converse room addition requires Bexar County inspections for structural framing, plumbing rough-in, electrical rough-in, HVAC, and a final building inspection for the certificate of occupancy. If the septic capacity evaluation applies, the county verifies the system before final sign-off. We schedule every inspection and walk through each one with the inspector, and we don’t call the project complete until you have the certificate in hand. Call (430) 258-2928 if you’re planning a room addition or Room Addition Contractor project and want the process handled from day one.
Written by Troy Eastman, Owner at Benson ADU San Antonio, serving Converse homeowners with written upfront pricing and the 365-Day Done Right Promise.
