A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Four Corners, TX
Four Corners, TX sits just west of Houston in Fort Bend County, where large estate-style lots and county-level zoning make ADU construction simpler than almost anywhere else in the metro. Most detached ADUs in this area run $180,000 – $320,000 before site work, depending on size, foundation type, and utility tie-ins. If you’re weighing a backyard cottage for rental income or a multigenerational suite, call (940) 242-3207 and we’ll give you a written price before any work begins.
Why Four Corners Homes Are Different
Four Corners doesn’t have a formal ADU ordinance, which changes the whole game. Permits are typically handled directly through Fort Bend County with no city-level inspections, so projects move faster, but the responsibility for code compliance on electrical and septic tie-ins falls squarely on your builder. That’s where experience matters. We’ve seen plenty of properties out here where a detached ADU looks simple on paper until you factor in the septic system. Many of the older ranch-style homes in Four Corners and the newer custom builds on acreage run on individual septic, not municipal sewer. That affects where an ADU can sit, how far it must be from the drain field, and whether you need a tank upgrade before the cottage ever goes vertical.
The climate adds another layer. Gulf Coast humidity means an ADU without high-efficiency AC becomes a mold box by August. We spec moisture-resistant sheathing, elevated foundations where drainage is poor, and wind-rated framing because hurricane season is a real factor here, not a hypothetical. Buyers who self-manage a Four Corners ADU often discover these details too late. Your builder should be telling you about them up front, in writing, before you sign anything.
Our Main Four Corners Services
These are the three projects homeowners in Four Corners call us about most often. Each one has its own dedicated page with pricing detail, timelines, and what to expect on a Four Corners lot.
Home Addition Contractor in Four Corners
A home addition in Four Corners usually means extending off the back or side of an existing ranch home, and the first question is always foundation. Some of these older slabs have settled over decades, and tying new concrete to old requires a structural assessment before we quote anything. We also check whether your existing HVAC can carry the added square footage in this climate. See Home Addition Contractor in Four Corners for pricing and what a typical addition involves out here.
ADU Builders in Four Corners
Detached ADUs are the fastest-growing project type in Four Corners, mostly because the county path is so much simpler than in Houston proper. The big decision is prefab versus stick-built, and we walk you through both honestly. Prefab lines like Dvele and Mighty Buildings can shave weeks off the timeline, while stick-built gives you total control over layout on an acreage lot. See ADU Builders in Four Corners for the full breakdown, including what septic and electrical work typically adds to the total.
Room Addition Contractor in Four Corners
A room addition is the smallest scope but not always the simplest. In Four Corners, it’s often a bedroom for an aging parent or a home office, and the conversation usually starts with whether you can build on the existing slab or need a new foundation. On septic lots, a room addition rarely triggers a septic review, but electrical panel capacity can be a real constraint in older homes. See Room Addition Contractor in Four Corners for typical room addition costs and timelines.
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 Four Corners
We work regularly with prefab and modular ADU brands including Dvele, Mighty Buildings, and Plant Prefab. Parts and panels arrive through our Houston supply chain, and we coordinate delivery to Four Corners lots directly. For a fuller picture of what we support, see our brands.
Pricing for ADU Company in Four Corners, TX
| Service | Typical range in Four Corners |
|---|---|
| Detached ADU, 400 – 600 sq ft | $180,000 – $260,000 |
| Detached ADU, 600 – 900 sq ft | $240,000 – $320,000 |
| Detached ADU, 900+ sq ft | $300,000 – $380,000+ |
| Garage conversion to ADU | $90,000 – $160,000 |
| Prefab ADU (Dvele, Mighty Buildings, Plant Prefab) | $200,000 – $340,000 installed |
| Site work, utilities, and septic tie-in | $15,000 – $45,000 |
| Home addition, ground-up (400 – 600 sq ft) | $160,000 – $240,000 |
| Room addition (single room, 200 – 300 sq ft) | $70,000 – $120,000 |
| Foundation work (new slab or pier-and-beam) | $12,000 – $35,000 |
| Electrical panel upgrade (if required) | $3,500 – $7,500 |
Two things push cost in Four Corners more than anything else: septic system upgrades and foundation type. If your lot drains poorly or the county requires a larger tank for the added bedroom, that line item moves first. We price every element up front and put it in writing, so what you sign is what you pay.
Neighborhoods We Serve in Four Corners
We work across the Four Corners area, from older ranch subdivisions to newer acreage communities. Typical response time for an estimate visit is one to two business days, depending on where your lot sits.
- Westheimer Lakes area
- Canyon Gate at Westheimer Lakes
- Grand Mission
- Lakes of Bella Terra
- Unincorporated acreage off FM 1093
Service Area – Cities Near Four Corners
While this page focuses on Four Corners, our crews also serve homeowners in nearby communities. You can read about our work in Houston, TX, The Woodlands, TX, Pearland, TX, and Humble, TX. Scheduling is coordinated from our Houston office, and each project gets the same written pricing and Threshold Verified crew standards no matter the city.
Serving Four Corners, TX - Our Local Coverage Area
We’re based in the Four Corners 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 Four Corners
County-level permitting in Four Corners often moves faster than city permitting elsewhere in the Houston area, but site conditions control the real timeline. Septic reviews, foundation work, and utility trenching all take time. You’ll get a written schedule with your estimate so you know what to expect before you commit.
Some subdivisions in Four Corners have deed restrictions even though the county handles the building permit. If your lot falls under an HOA, we’ll flag that early and walk you through what the covenants require. The county permit won’t override a deed restriction, so it pays to check before you buy plans.
Yes. We give you a written line-item price before any work starts, and we don’t pass surprise change orders to the bill. If we uncover a septic complication during site work, we stop and re-quote in writing before doing anything else. Call (940) 242-3207 to schedule a free estimate and get exact numbers for your Four Corners lot.
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 Four Corners Customers Say
"Detached unit with a small kitchen and bath. Windows and finishes were nicer than I expected for the budget."
- Philip S."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R."Insulated the walls and ceiling properly. It stays comfortable even in July."
- Tamika W.
