Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Greatwood
Home additions and ADU construction in Greatwood typically run between $45,000 and $220,000 depending on whether you’re converting a garage, adding a second story, or building a detached unit from the ground up. The real question isn’t just cost: it’s whether your contractor understands Greatwood’s HOA architectural review process, Fort Bend County’s floodplain rules, and the black gumbo clay that heaves slabs under 77469 homes. We do. Barrett & Sons Construction has framed additions and ADUs on cul-de-sacs off Greatwood Parkway, along Brazos River corridor lots, and throughout every neighborhood inside the master plan. Call (877) 610-1318 and Tom Barrett or one of his sons will talk you through what your specific lot will actually allow.
Why Barrett & Sons Construction Is Greatwood’s Preferred Home Additions & ADU Company
Greatwood is not a place where you want a contractor learning on the job. The HOA architectural review happens before Fort Bend County will even look at your permit application. The soil moves. And depending on where your lot sits relative to the Brazos River, FEMA rules may force an elevation certificate before you can touch a wall. We’ve been navigating those layers since 1998, and Tom Barrett publishes his name, address, and license number so you can verify everything before signing anything.
Our crews are background-checked, uniformed, and led by Tom’s sons. No subcontractor roulette. The same faces who frame your walls pull your permits and walk your inspections. Reviews from Greatwood homeowners mention the same things: written change orders before any scope change, allowances in writing, and the 90-Day Done Right Promise on every job. If it’s not done right, Tom comes back. One call.
Response time to Greatwood is tight. Scheduling is coordinated from our Houston office, but crews work Greatwood locally and we know the master plan’s streets, HOAs, and inspection rhythms. When a Greatwood homeowner calls about a garage conversion, we already know which section of the community they’re in and what that section’s architectural guidelines require.
Our Home Additions & ADU Services in Greatwood
Our Home Additions & ADU team handles everything from design to final inspection. In Greatwood specifically, we’ve learned to plan around the dual gate: HOA first, county second. Here’s what that looks like in practice.
New Detached ADU
A new detached ADU in Greatwood runs $90,000 to $220,000. That range covers everything from a 400-square-foot studio with a wet bar to a full two-bedroom unit with laundry. The Greatwood-specific variable is soil. We install engineered pier systems rather than conventional footings because the clay under most lots expands in wet winters and contracts in 100°F summers. Skip the piers and your door frames will rack within two years.
Garage Conversion ADU
Garage conversions in Greatwood run $30,000 to $80,000. These are popular because the shell already exists, which trims framing costs. But the HOA review is mandatory: converting a garage changes the home’s street elevation, and some Greatwood sections require a replacement parking plan before they’ll sign off. We prepare that documentation as part of the permit set.
ADU Design & Permitting
We carry this as a standalone service because Greatwood homeowners often want to lock down HOA approval and county permits before committing to construction. The design package includes site plans, structural drawings, and the architectural elevation details your Greatwood section requires. Permits get pulled in sequence: HOA approval first, then Fort Bend County building permit, then trade permits.
Junior ADU & Interior Conversion
A junior ADU converts existing interior space, like a bonus room or oversized utility room, into a self-contained living unit. In Greatwood’s newer homes, the bonus room over the garage is the most common candidate. These projects run lower than detached ADUs because there’s no new foundation, but the HOA still needs to approve the plumbing and egress changes.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Greatwood
We stock and install materials you can look up: Schluter systems for waterproofing and uncoupling in wet spaces, Sterling fixtures for ADU bathrooms, and GAF roofing on any addition that ties into the existing roofline. When a Greatwood homeowner asks for a specific brand, we don’t substitute a mystery product off a van. Every material get scoped in writing, every allowance is on paper, and if a price changes, it arrives as a written change order before work proceeds. That’s how we’ve kept customers across 77469 for over 29 years.
Common Home Additions & ADU Problems We See in Greatwood Homes
- Skipping HOA review before framing. We’ve walked onto jobs where a homeowner started a garage conversion without architectural sign-off, and Fort Bend County withheld the building permit until the Greatwood design review board met again. That’s a 30-to-45-day stall on the draw schedule, and it’s entirely avoidable with the right sequence.
- Underestimating soil movement. An addition tied to the original slab without helical piers will rack door frames within two wet winters. The existing structure’s builder warranty doesn’t cover tenant improvements, so the repair becomes your problem. We’ve seen this happen in Greatwood’s older sections and the fix is costly.
- Building in the Brazos floodplain without an elevation certificate. If cumulative work passes FEMA’s 50% substantial improvement threshold, the county forces a pier-lift scope mid-project. That can blow the allowance twice over. We check floodplain status and elevation requirements before the first stake goes in the ground.
- Assuming a patio slab can carry a sunroom. Most Greatwood patio slabs are 4-inch non-structural pours. A sunroom with a roof and windows needs proper footings, and in Greatwood’s clay that means piers. Reusing the existing slab as a foundation is a recipe for settlement cracks.
How Greatwood’s HOA and Floodplain Rules Shape Every Project
Greatwood is a master-planned community built along the Brazos River corridor in Fort Bend County, mostly between the late 1980s and early 2010s. That history created a construction environment unlike anything you’ll find in Sugar Land or New Territory. Any Home Addition or ADU project must clear the Greatwood HOA architectural review before Fort Bend County will accept a permit application. That’s a dual gate: two governing bodies, two review cycles, two sets of drawings. We plan for both from day one.
Then there’s the floodplain. Portions of Greatwood sit within the Brazos River floodplain, and after Hurricane Harvey inundated hundreds of homes here in 2017, FEMA compliance became routine residential work. The substantial improvement rule applies to post-flood repairs and new construction alike: if your cumulative structural work exceeds 50% of the structure’s pre-damage assessed value, you must bring the entire structure into flood compliance. That can mean elevation certificates, flood vents, or even a pier-lift scope. Our team has handled these requirements mid-project without a change order because we sequence them up front.
Pricing for Home Additions & ADU in Greatwood, TX
Here’s what Greatwood homeowners can expect to pay for the most common addition and ADU scopes in 77469. These are market-calibrated ranges based on current Fort Bend County labor and material costs, not national averages.
| Project | Greatwood Price Range |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
What moves the number? Foundation work is the biggest swing factor in Greatwood. A detached ADU that needs six engineered piers to bedrock will cost more up front but won’t rack its doors in year two. HOA-required brick veneer elevations add material cost. Floodplain compliance, when it applies, adds documentation and sometimes structural scope. Every estimate we give is line-itemed and free. Call (877) 610-1318 and we’ll walk your lot, check your floodplain status, and tell you exactly what your Greatwood section’s HOA will require.
What to Expect When You Build in Greatwood
Our crew recently framed a 480-square-foot detached ADU on a cul-de-sac off Greatwood Parkway. The original slab had heaved 1.5 inches at the southeast corner, the black gumbo clay doing what Fort Bend County clay does. We installed six engineered piers to bedrock before setting the subfloor, kept all HOA-required brick veneer elevations in the permit set, and pulled a separate plumbing rough-in inspection to keep the project moving. No change order. No surprise invoice.
That’s the job in Greatwood: you’re not just building a room. You’re building in a master-planned community with an HOA that reviews every elevation, soil that moves more than most contractors expect, and a floodplain that demands paperwork. A contractor who doesn’t respect those three forces will cost you time and money. We’ve been working in this community long enough to know all three by heart.
The Right Order of Operations for a Greatwood ADU or Addition
If you’re planning a home addition or ADU in Greatwood, here’s the sequence that keeps your permit valid and your budget intact. First, check your lot’s floodplain status and pull an elevation certificate if you’re inside the Brazos corridor. Second, submit your architectural elevations to the Greatwood HOA design review board. Third, once HOA approval lands, file with Fort Bend County. Fourth, complete soil testing and foundation engineering before framing. That’s the order. We’ve seen homeowners try to reverse it, and it always costs more.
We Also Serve Cities Near Greatwood
Our Home Additions & ADU team works throughout Fort Bend County and the surrounding area. If you’re in Sugar Land, New Territory, Pecan Grove, or Four Corners, we bring the same written change orders, soil-aware foundations, and 90-Day Done Right Promise to your project. Call (877) 610-1318 to schedule a free estimate anywhere in the region.
Serving Greatwood, TX - Our Local Coverage Area
We’re based in the Greatwood 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 - Home Additions & ADU in Greatwood
Yes. The Greatwood HOA architectural review is mandatory before Fort Bend County will accept your permit application, and skipping it typically adds 30 to 45 days to the draw schedule. HOA approval covers elevation, materials, rooflines, and sometimes replacement parking. We prepare both sets of drawings up front so the HOA review and county permit move in sequence rather than stalling mid-project. Call (877) 610-1318 and we’ll tell you what your specific Greatwood section requires.
No, not by itself, but the new structural work lands on your existing slab and framing, and if your addition causes movement in the original structure, warranty claims on the original home can be denied. In Greatwood’s clay soil, an upper-story addition tied to the original slab without engineered piers can rack door frames and crack brick veneer within two wet winters. We engineer foundations for Greatwood conditions specifically so the new work doesn’t destabilize the old. A written scope and a soil report are the first two documents on our second-story jobs.
Because portions of Greatwood sit inside the Brazos River floodplain, and FEMA’s substantial improvement rule applies to cumulative structural work above 50% of the structure’s pre-damage assessed value. If your room addition plus any prior repairs crosses that threshold, Fort Bend County requires flood compliance, which can include elevation certificates, flood vents, or even structural lifting. We check floodplain maps and elevation data before you commit to a scope, so you’ll know in writing exactly what’s required and what it costs. Estimates are free.
A garage conversion ADU in Greatwood typically runs $30,000 to $80,000, while a new detached ADU runs $90,000 to $220,000. The gap comes from foundation work, new utilities, and the cost of building a full shell from the ground up. Garage conversions reuse existing framing, so they’re cheaper per square foot, but Greatwood HOAs often require a replacement parking plan, which can add a paver or concrete pad. Detached ADUs give you more square footage and no parking requirement, but the slab and piers are a larger line item in Greatwood’s clay soil. Call (877) 610-1318 for a line-itemed quote on either path.
You almost always need new footings. Most Greatwood patio slabs are 4-inch non-structural pours that were never engineered to carry the weight of walls, windows, and a roof. In Greatwood’s expansive clay, a sunroom built on an existing patio slab will settle and crack. We design sunrooms with proper piers or footings, and where HOA elevations require brick veneer, we include those details in the architectural submittal. The inspector works for you, not for us. We like when he shows up.
Call Barrett & Sons Construction for Your Greatwood Home Addition or ADU
Greatwood is a community where the wrong contractor costs you months of HOA delays and a foundation that fights you forever. The right contractor knows the design review board, the clay, and the floodplain. Tom Barrett and his sons have been building in Fort Bend County since 1998, and we stand behind every job with the written 90-Day Done Right Promise. Call (877) 610-1318 to schedule your free estimate. A live person answers. We’ll walk your lot, check your floodplain status, and tell you in plain English what your Greatwood home can handle.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Greatwood and Fort Bend County since 1998.