A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in San Antonio, TX
An ADU in San Antonio is a second, fully livable home built on your existing lot, and the way this city is laid out makes it one of the most practical places in Texas to build one. We’re Seedling ADU San Antonio, and we build accessory dwelling units, garage conversions, and home additions for families across the metro. What changes the work here more than anything is the soil: much of San Antonio sits on expansive clay that shifts with summer heat and winter rain, so every foundation decision matters more than it would in, say, Austin or Dallas. Call us at (210) 981-6358 when you’re ready to talk through what your lot can support.
Why San Antonio Homes Are Different
San Antonio’s housing stock splits into two very different worlds. Inside Loop 410, you’ll find early 20th-century bungalows and craftsman homes in neighborhoods like Jefferson, Beacon Hill, and Alta Vista, many with detached garages facing rear alleys. Outside the loop, the city sprawls into 1960s through 1990s tract subdivisions with oversized backyards that were practically designed for an ADU. That gives San Antonio a rare advantage: an alley-loaded ADU in an older neighborhood can be built without touching the front yard’s historic character, while an outer-ring lot often has room for a detached unit the size of a small house.
The summer heat is the other constant. A poorly insulated ADU in San Antonio becomes an oven by July, so we focus on energy-efficient cooling, window placement that blocks western sun, and shade structures where the lot allows. In the northwest, especially near the Edwards Aquifer recharge zone, stormwater rules add another layer; we plan for permeable surfaces and proper drainage from day one, not as an afterthought during inspection.
Our Main San Antonio Services
Most San Antonio homeowners call us about one of three things: adding square footage to the main house, turning an underused garage into livable space, or building a standalone ADU from the ground up. Each has its own page with pricing specifics and local details.
Home Addition Contractor in San Antonio
A home addition in San Antonio usually means a new primary suite, a second living room, or a mother-in-law wing attached to the existing structure. The clay soil here is the wildcard: an addition needs foundation engineering that accounts for expansion and contraction, especially in older neighborhoods where the original slab has already settled into its final position. We handle that assessment as part of the written price, so there’s no surprise soil report fee after the fact. Shoe covers and drop cloths go down before any work begins, and the crew protects the occupied side of the house with a sealed barrier. See Home Addition Contractor in San Antonio for full pricing and process details.
Garage Conversion Contractor in San Antonio
San Antonio’s older neighborhoods are full of detached garages that sit empty, and converting one is often the fastest path to a rental unit or guest suite without changing the home’s footprint. The catch is that many of these garages were never insulated, and their slabs may not meet current code for living space. We inspect the existing foundation, add insulation rated for San Antonio summers, and bring the electrical and plumbing up to what a habitable unit requires. Whether the garage faces the street or an alley, we keep the exterior looking like it belongs in the neighborhood. See Garage Conversion Contractor in San Antonio for what a typical conversion costs.
ADU Builders in San Antonio
A detached ADU on a San Antonio lot is a new home in miniature, and the city’s tiered lot patterns give us options most Texas metros don’t have. In places like Beacon Hill or Jefferson, we often position the unit along the alley so the main yard stays open and the street view doesn’t change. In newer subdivisions around Alamo Ranch or Stone Oak, we have room to place the ADU where it catches the least punishing afternoon sun. We work with brands like Plant Prefab, Abodu, and Tuff Shed when the lot and budget call for a factory-built shell, and we build custom onsite when the vision demands it. See ADU Builders in San Antonio for the full breakdown.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in San Antonio
We work with the names serious ADU buyers research before picking up the phone: Plant Prefab, Abodu, Tuff Shed, and James Hardie materials among them. Each has strengths for different San Antonio lots, soil conditions, and budgets, and we walk you through which one fits your site before anyone writes a check. See our brands for the full list and what each factory brings to the table.
Pricing for ADU Company in San Antonio, TX
| Service | Typical range in San Antonio |
|---|---|
| Detached ADU (studio, 400 – 600 sq ft) | $120,000 – $185,000 |
| Detached ADU (1-bedroom, 600 – 900 sq ft) | $165,000 – $240,000 |
| Detached ADU (2-bedroom, 900 – 1,200 sq ft) | $210,000 – $310,000 |
| Garage conversion (attached, finished) | $65,000 – $110,000 |
| Garage conversion (detached, full plumbing + kitchen) | $85,000 – $140,000 |
| Home addition (primary suite, 300 – 500 sq ft) | $90,000 – $150,000 |
| Home addition (family room, 200 – 400 sq ft) | $60,000 – $110,000 |
| Home addition (second story, 600 – 1,000 sq ft) | $180,000 – $280,000 |
| Prefab ADU (Plant Prefab or Abodu, installed) | $140,000 – $260,000 |
| Foundation repair / soil correction (if needed) | $8,000 – $30,000 |
What pushes a San Antonio price up is usually the soil: if core samples show expansive clay that needs a deeper or reinforced foundation, that line item grows. Which is exactly why we give you a written price before any work starts, so you know the foundation cost before the crew arrives, not after.
Neighborhoods We Serve in San Antonio
We build ADUs, garage conversions, and home additions across the entire San Antonio metro. Most of our work concentrates in the inner-ring neighborhoods where lots are deep and alleys are common, plus the outer subdivisions where backyards run large.
- Jefferson
- Beacon Hill
- Alta Vista
- Alamo Ranch
- Stone Oak
Service Area – Cities Near San Antonio
In addition to San Antonio proper, we take on ADU and addition projects in the surrounding communities. Families in Universal City, TX, Helotes, TX, Cibolo, TX, and Floresville, TX call us for the same written pricing and the same Cedarwell Care Promise they’d get inside the loop.
Serving San Antonio, TX - Our Local Coverage Area
We’re based in the San Antonio 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 ADU Company in San Antonio
It depends on your subdivision. Many San Antonio HOAs, especially in master-planned communities around Alamo Ranch and Stone Oak, have design review processes for detached structures, and some still prohibit rental ADUs entirely. We check your HOA’s specific rules before quoting so you don’t pay for plans that won’t get approved. Call (210) 981-6358 and we’ll start that review with you.
Most detached ADUs in San Antonio run four to seven months from permit to final inspection, with garage conversions and single-room additions landing closer to six to ten weeks. The permit timeline varies by whether your lot is inside city limits or in an unincorporated area of Bexar County. We’ll give you a clear schedule with your written price.
San Antonio’s expansive clay has a well-earned reputation for moving, and an ADU put on a slab meant for a shed will crack within a few seasons. We order soil borings on every detached build and engineer the foundation to match what’s underneath your specific lot. It’s a line item in the written quote, so you see the cost before the first shovel goes in. Call (210) 981-6358 to schedule a lot review.
Contact Seedling ADU San Antonio
Every project we build in San Antonio starts the same way: a conversation about your lot, your family’s needs, and a written price before any work begins. Whether you’re adding a rental unit behind a Beacon Hill bungalow or converting a garage in Alamo Ranch, we’ll protect your floors, respect your schedule, and leave the site clean every single day. Call (210) 981-6358 to schedule your free estimate.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What San Antonio Customers Say
"Garage conversion into a studio. They sealed off the work area so dust didn't get into the house, and cleaned up every day before leaving. Calm, careful team to have around."
- Darnell Hobbs"Garage to studio conversion with us living right there. They sealed off the dust, cleaned up daily, and respected our quiet hours. No surprise costs. Beautiful."
- Terrence Boylan"Added a backyard cottage. The team protected our existing landscaping and left the yard clean every evening. Gentle, respectful, and they walked us through each stage calmly."
- Tamara Welsh
