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 Schertz
Room additions in Schertz typically run $180 to $320 per square foot for site-built construction, depending on foundation type, roof complexity, and whether you’re working within an existing slab or adding a new one. Our crews already know the neighborhoods here: the larger mid-century lots off FM 1518, the newer HOAs near Wiederstein Road, and the subdivisions around Schertz Parkway where setbacks vary block by block. We serve Schertz every week, with dispatch coordinated from the San Antonio office at (430) 258-2928. You’ll get a written line-item price before any work starts, not a verbal number that drifts once framing begins. If you’re thinking about a room addition in Schertz, that’s a conversation we can start today.
Why Benson ADU San Antonio Is Schertz’s Preferred Room Addition Contractor Company
Room addition projects in Schertz move faster when your contractor already knows what the city will ask for before you pull the first permit. Our team has walked through Schertz owner-occupancy affidavits, wind-load inspections, and HOA review processes in subdivisions like the ones off Roy Richard Drive and along Schertz Parkway. We’re part of the Relay Home Co. family, founded 2006, and we work under The Relay Visibility Guarantee: a written price before work starts, a 365-Day Done Right Promise, and a written guarantee stamped on every project. Every technician who comes to your Schertz property is background-checked and arrives in uniform, so you know who’s walking onto your lot.
We’re also authorized to build with materials brands that Schertz inspectors recognize without a second look: James Hardie fiber-cement siding, Simpson Strong-Tie connectors, and prefab envelope systems from Plant Prefab and Tuff Shed. That matters when you’re matching an existing brick or fiber-cement exterior from a 1980s-era Schertz home and the addition has to look like it was always there. Call (430) 258-2928 and a live person picks up. No phone tag.
ADU Conversion in Schertz
ADU Conversion in Schertz means taking existing square footage – a garage, a workshop, a large utility room – and turning it into a permitted, rentable or multigenerational living space. The 2021 city ordinance allows ADUs up to 1,200 square feet, but only on lots larger than 10,000 square feet, and only if the property owner lives on-site. That owner-occupancy rule is the first thing we check before any design work happens, because a detached ADU design that violates it wastes your time and money.
Garage-to-ADU Conversions
Older Schertz homes, especially those built in the 1970s and 1980s around Schertz Hills and Fairhaven, often have oversized attached garages that convert well. The work includes insulation, window and door replacement, electrical subpanel work, and sometimes raising the slab to meet flood-plain elevation if the lot sits near Cibolo Creek. We see garage conversions on lots over 10,000 square feet typically run $95,000 to $145,000 depending on whether the garage shares a wall with the main house or stands detached.
Detached vs. Attached ADUs
A detached ADU gives you a separate entrance and full privacy, but Schertz zoning is stricter on detached units: lot size minimums, rear and side setbacks, and stormwater drainage all get reviewed. An attached ADU – converting a side wing or extending an existing room – usually clears the city faster because it ties into the main structure’s foundation and envelope. We’ll tell you honestly which path fits your lot before we’ve spent a dollar on design.
Sunroom Builders in Schertz
Sunroom Builders in Schertz deal with a specific Texas climate reality: that sunlit glass room has to survive a July afternoon that pushes 100 degrees and a storm season that can bring 60 mph gusts through in an afternoon. A cheap sunroom with single-pane glass and frame-only anchors turns into an unusable hotbox in summer and a wind liability when a severe thunderstorm rolls through off I-35. We build sunrooms with insulated low-E glass, moisture-resistant framing, and wind-rated tie-downs so the room holds up and stays comfortable.
Three-Season vs. Four-Season Rooms
A three-season sunroom in Schertz works for spring and fall use, and it costs less – typically $45,000 to $75,000 depending on square footage and glazing. A four-season room with HVAC connection, insulated floor, and moisture-sealed envelope runs $70,000 to $110,000, but it’s usable in August and January both. If you’re adding the sunroom as a dedicated office or a place for aging parents, go four-season.
Tying a Sunroom Into the Existing Roof
One of the biggest failure points we see in Schertz is a sunroom roof that doesn’t tie into the main house properly. The city’s wind-load inspector will look at the tie-down schedule, and if it isn’t engineered and stamped, you’re not passing. Our quotes include structural engineering and stamped drawings from day one – not as an add-on after the fact.
Trusted Brands We Service in Schertz
We’re authorized to build with Abodu and Plant Prefab for prefab ADU and room addition modules, which saves Schertz homeowners weeks of on-site framing time. James Hardie fiber-cement siding and trim are our default exterior choice here, because Hardie product carries wind ratings the city recognizes and it holds paint better than wood in Schertz humidity. We also use Tuff Shed structures for finished backyard studios and home offices where a full site-built addition doesn’t make sense. Because we stock these brands’ components locally, our Schertz turnaround on materials is shorter than a contractor ordering custom from out of state. You can research every product we propose – these are established names, not private-label unknowns.
Common Room Addition Contractor Problems We See in Schertz Homes
- Owner-occupancy confusion. Homeowners assume that because they own a Schertz lot, they can add a detached ADU and rent it. The 2021 ordinance says otherwise: owner must live on the property. We check this before design starts so you don’t pay for plans the city rejects.
- Undersized wind-load specs. A room addition on a Fairhaven lot with open exposure to the east sees real wind. If the tie-down schedule isn’t engineered for Schertz’s wind zone, the inspector bounces it and you’re paying for a re-do. Our quotes include stamped engineering up front.
- HOA restrictions in newer subdivisions. Communities off Roy Richard Drive and along FM 3009 often have covenants that restrict or prohibit ADUs entirely. We review your HOA’s CCRs before quoting, so you don’t sink $8,000 into design fees for a project your association will kill.
- Septic and drainage conflicts. Many older Schertz lots outside city sewer service rely on septic systems. Adding square footage can trigger a septic capacity review, and a room addition that changes drainage flow toward Cibolo Creek will need stormwater mitigation. We flag this early instead of discovering it at permit time.
Pricing for Room Addition Contractor in Schertz, TX
Here’s what we tell Schertz homeowners to budget. A standard site-built room addition of 400 square feet with a slab-on-grade foundation runs $75,000 to $130,000 depending on finish level. A garage-to-ADU conversion of roughly the same square footage runs $95,000 to $145,000. Sunrooms start around $45,000 for a basic three-season build and climb to $110,000 for a four-season room with HVAC. Factors that swing the number: whether your lot is over or under 10,000 square feet, septic versus city sewer, HOA design review fees, and whether existing slab work can be reused. We give a written line-item price before any work starts. Call (430) 258-2928 and we’ll schedule a free site walk in Schertz.
We Also Serve Cities Near Schertz
From our San Antonio dispatch hub, we run crews into Universal City, Converse, and Bulverde weekly. Many of those homeowners face the same wind-load and HOA questions as Schertz, and our Room Addition Contractor team handles it all. If you’re just outside Schertz limits, you’re still in our service area. Our Schertz page covers the local ordinance details, but nearby cities get the same written-price guarantee.
Serving Schertz, TX - Our Local Coverage Area
We’re based in the Schertz 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 Schertz
Schertz falls under a 115 mph ultimate design wind speed per current Texas wind-load standards, which means your addition’s roof connections, wall anchorage, and tie-down schedule must be stamped by a licensed engineer. A compliant quote includes that engineering work and documentation; a cheap quote often skips it, then the inspector rejects the permit. We include stamped engineering in every Schertz room addition quote, no exceptions. Call (430) 258-2928 to talk through your specific lot.
No, the owner-occupancy requirement applies specifically to ADUs – accessory dwelling units that are separate or semi-separate living quarters. Adding a bedroom, office, sunroom, or family room to your existing house is a standard addition and doesn’t trigger owner-occupancy review. The confusion comes when a room addition effectively creates a second dwelling unit on the property; if you’re wiring in a kitchen and a separate entrance, the city may treat it as an ADU. We sort this out at the first site visit, before you spend on design. Call (430) 258-2928 for a free walkthrough.
James Hardie fiber-cement siding and trim, Simpson Strong-Tie structural connectors, and prefab wall and roof panels from Plant Prefab and Tuff Shed all carry documented wind ratings that Schertz building inspectors accept without extra documentation fights. What matters is that the engineering spec matches the product; we verify that match and keep the paperwork on file for you. That documentation also matters for insurance claims later, which we’ll get to. Call (430) 258-2928 to talk product options for your addition.
You keep the stamped engineering drawings, the inspection sign-offs, and the product specs from the job – we hand you a compliance packet at closeout. If a storm damages your addition, that packet is what your insurer uses to confirm the structure was built to code, which can affect how the claim is handled and what they’ll pay. Contractors that skip wind-load documentation leave you arguing with an adjuster with no paper trail. We build the file as we build the room. Call (430) 258-2928 if you want a quote that includes that documentation.
Maybe, and the answer depends on your specific community’s CCRs. Some subdivisions off Roy Richard Drive and along Wiederstein Road restrict detached structures outright; others require design review but approve attached additions that match the home’s exterior. We pull the HOA’s guidelines before we draft plans, and where the HOA allows it, we submit your addition with elevations and finish samples so the review board has what it needs. If the HOA blocks the project, you know early and you haven’t spent a dime on engineering. That’s the honest order of operations in Schertz.
Written by Troy Eastman, Owner at Benson ADU San Antonio, serving Schertz homeowners with written-price room additions and ADU conversions.
