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Sterling Home Additions & ADU: The San Antonio Owner's Guide
If you have a Sterling-built home addition or ADU in San Antonio and something has failed, we can source and install the correct replacement part. A full Sterling home addition or ADU project in San Antonio runs $45,000 – $130,000, but individual component repairs – a door threshold, a window flange, a tie-in flashing detail – typically land between $400 and $4,500 depending on what failed and how far the damage spread. Most owners discover the problem the same way: a soft spot in the floor near the original house connection, a door that suddenly won't latch, or water staining where the addition meets the main roofline. You're not looking for a whole new addition. You're looking for the one part that broke – and a contractor who can identify it without turning the job into a complete rebuild.
Which Sterling Models This Applies To
Sterling home additions and ADUs in San Antonio share common construction details regardless of square footage. The tie-in points – where the addition roof meets the original house, where the new slab meets the old foundation, where the addition's siding meets the existing exterior – are almost always where failures start. Sterling ADU models built in the last 15 years typically use 2×6 exterior wall framing with engineered lumber headers over window and door openings. On pre-2000 Sterling additions, you may find 2×4 framing and a different flashing profile at the roofline. That matters, because a part meant for a 2×6 wall will not seat correctly in a 2×4 opening without furring strips and shims.
We are an independent San Antonio remodeling contractor, not affiliated with Sterling. We stock common tie-in flashing, threshold, and door hardware that fits the majority of Sterling addition and ADU configurations, and we work with material partners including Cambria, Silestone, and KraftMaid when a failed part sits next to a surface that needs matching. When a Sterling-specific part is obsolete, we match an equivalent by measurement – depth, reveal, fastener spacing – rather than by brand name alone, because a correct fit outlasts a correct logo.
Styles & brands we work with
Signs Your Sterling Home Additions & ADU Is Failing
- Water staining where the addition roof meets your original home. The step flashing at the tie-in has shifted or corroded, a common reality in San Antonio's alternating dry-heat and monsoon-season cycles, which expand and contract metal flashing faster than coastal or northern climates.
- A door between the main house and the addition drags or refuses to latch. Slab settlement at the connection point – the new concrete footing pulling away from the existing foundation – has thrown the rough opening out of square. The fix is often a threshold replacement, not a door replacement, but the underlying cause needs addressing.
- Visible floor sag near the exterior wall of the ADU. Rim joist rot from sprinkler overspray or poor drainage. San Antonio's clay-heavy soil holds water against foundation walls, and a Sterling addition's sill plate is the part that absorbs it first.
- Cracks running vertically from the corners of windows and doors in the addition. Header deflection or foundation movement. Hairline cracks are cosmetic; cracks wider than a quarter that run through the drywall compound signal something structural.
- Air temperature difference that you can feel as you walk from the main house into the addition. Failed or compressed weatherstripping at the transition, missing insulation batts in the cavity above the tie-in, or a disconnected HVAC duct that serves the room.
See the difference
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After
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AfterReplacement Cost & What's Included
Component-level repair on a Sterling home addition or ADU in San Antonio runs $400 – $1,800 for exterior flashing and threshold work; $800 – $3,000 when interior trim or drywall needs removal to reach the failed part; and $3,000 – $6,500 when rim joist, sill plate, or a section of subfloor has to come out and be rebuilt. Full-scale structural repair that touches the foundation connection can reach $8,000 – $15,000. What drives the range is access – whether the failed part is visible from outside or burned behind cabinetry and tile – and whether matching material has to be ordered.
Every job gets a written price before any work starts. That number includes the part, the labor, the fasteners, the flashing, the haul-away, and the photo of the clean-up before our crew leaves. If the scope has to change once we open the wall and see what is actually happening, you approve the change in writing before we proceed. The price does not grow on its own. Our 365-Day Done Right Promise covers the completed repair – if it fails within a year, we make it right.
DIY or Call Us?
Some things you can check yourself before calling. Walk the exterior where the addition meets the house and look for pulled-back caulk, rusted flashing, or a gap between the siding and the roofline. Inside, check the door that leads from the main house into the addition – run your hand along the threshold and feel for softness or a visible gap underneath. If you find a small caulk failure, recaulk it. Document what you see with photos so we can quote more accurately before we arrive.
If water has been entering for more than one San Antonio rainy season, do not open that wall yourself. You do not know if the electrical was run through the same cavity, and you do not know what mold you are about to stir into the air your kids breathe. Rim joist and sill plate work sits close to the structure – a mistake there stays with the house. Call us at (432) 233-0976 and we will open it carefully, with shoe covers on and drop cloths down. Our crew wears uniforms and carries proper equipment, not whatever was in the truck bed. Write it down, price it once, do it right – that is how Graham Stein runs every job.
FAQs
A properly built Sterling addition or ADU should last 50+ years in San Antonio, but the tie-in components – flashing, thresholds, weatherstripping, the sill plate – typically need attention every 10 – 15 years because our heat and clay soil stress them earlier than the building envelope itself. Call (432) 233-0976 for an exact quote – estimates are free.
Yes. Flashing can often be re-seated and resealed rather than replaced, and a dragging door often needs only a threshold adjustment. We will always tell you if a repair will buy real years rather than a temporary fix. Call (432) 233-0976 and we will walk you through what you are actually seeing.
Most component replacements – a threshold, a flashing run, a section of damaged subfloor – are done in one to two working days once the part is in hand. Structural sill plate and rim joist work runs three to five days. You will get a schedule in writing before we start. Call (432) 233-0976 for a realistic timeline on your specific failure.
We stock common flashing profiles, thresholds, and door hardware that match most Sterling addition and ADU configurations. If your part is discontinued or model-specific, we order an equivalent by measurement and confirm it with you before cutting. Call (432) 233-0976 with your model information and we will tell you what is on hand.
Written by Graham Stein, Owner, Elmstead Remodeling San Antonio at Elmstead Remodeling San Antonio, serving San Antonio and nearby areas.
