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 Four Corners
Adding square footage or a separate living unit in Four Corners means working under Fort Bend County rules, not Houston’s. That distinction trips up a lot of contractors, and it is the first thing we check before we put a shovel in the ground. A home addition in Four Corners typically runs $45,000-$130,000, and a new detached ADU generally lands between $90,000-$220,000. If you are weighing a garage conversion, plan on $30,000-$80,000. Call (877) 610-1318 and we will walk you through every permit step before you spend a dime.
You are not just hiring a crew. You are hiring someone who knows that the 77083 ZIP sits in unincorporated Fort Bend County, where every inspection, every fee schedule, and every code adoption timeline follows county rules, not the City of Houston system that governs homes five minutes east. That knowledge keeps your project moving instead of stalled at a stop-work order.
Why Barrett & Sons Construction Is Four Corners’s Preferred Home Additions & ADU Company
We have been building and remodeling in this part of Texas for over 29 years, and Tom Barrett still answers his own phone. That matters when you are spending $60,000 of your retirement money on a room addition. You want the owner involved. Not a sales rep with a tablet quoting you a number that will change before the drywall goes up.
Our reputation in Four Corners comes from doing exactly what we said we would do, in writing, every time. We pull Fort Bend County permits on every eligible job. We put allowances and change orders on paper before work happens. The permit inspector works for you, not for me, and that is exactly why we like him showing up. Homeowners near Brays Bayou tributaries have told us about previous contractors who skipped permits entirely. That is not how we work, and it is not how your HOA expects the project to run.
Calls to (877) 610-1318 are answered by a live person, 24/7. Not a voicemail box. Not an out-of-state call center. When a Four Corners homeowner calls on a Saturday morning with a question about their slab, Tom or one of his sons picks up.
Our Home Additions & ADU Services in Four Corners
ADU Design & Permitting
The permitting sequence in Four Corners is the single biggest reason ADU plans die. A contractor accustomed to Houston jobs arrives expecting to pull permits online through the City of Houston portal. They discover they are in unincorporated Fort Bend County, the paperwork does not transfer, and the project stalls before the first inspection. We start every ADU in 77083 by confirming the Fort Bend County permit path, then we map out HOA architectural review if your home sits in one of the master-planned communities. This is not something we figure out on the fly. It is step one, every time. For full planning support, our Home Additions & ADU team handles drawings, code checks, and permit submittal as one package.
Garage Conversion ADU
A garage conversion is often the smartest ADU move in Four Corners, because the foundation and roofline already exist. The catch is the slab. Most homes in this area built between the 1980s and early 2000s sit on post-tension concrete engineered for Beaumont clay. Before we frame a single wall in your garage, we check for slab heave, because we have seen too many conversions where the new living space started cracking within two wet-dry seasons. In Four Corners, a garage conversion ADU typically runs $30,000-$80,000 depending on whether you are adding a bathroom, a kitchenette, or just a finished studio.
New Detached ADU
A standalone ADU in Four Corners gives you the most design freedom and the most permit complexity. You are dealing with Fort Bend County setback rules, finished-floor elevation requirements under the post-Harvey FEMA maps, and utility runs that have to cross your yard. Homes near Brays Bayou tributaries often have stricter elevation mandates than homes on the western side of 77083. We handle all of it, and we keep every change order in writing so you know what the county required and what it cost before the concrete pours. Budget $90,000-$220,000 for a new detached unit in this market.
Junior ADU & Interior Conversion
If you want rental income or a space for an aging parent without building a separate structure, a junior ADU inside your existing footprint is often the cleanest path. We convert oversized bedrooms, formal dining rooms, and bonus spaces into lock-off units with their own entrance and wet bar or kitchenette. In Four Corners, this route often moves faster because you are not fighting setbacks or foundation work the way you would with a detached build. The same Fort Bend County permits apply, but the inspection sequence is shorter.
We also handle room additions, second story additions, and sunrooms across Four Corners. Every scope goes in writing. Every change order gets signed before work proceeds.
What happens when you call
- 1
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 Four Corners
We do not show up with mystery materials off a van. On a Four Corners ADU or room addition, you will see names you can look up: Techo-Bloc for pavers around the new entrance, Cambridge Pavers if you are replacing a walkway as part of the project, and Quikrete products for slab work and concrete repair tied to the addition. Our Four Corners crews stock the common items locally, which keeps turnaround tight when the county inspector wants a correction addressed fast. You should know what brand is going into your home. The allowance sheet tells you exactly that, in writing, before we order anything.
Common Home Additions & ADU Problems We See in Four Corners Homes
- Wrong jurisdiction permits: Contractors who assume Houston permits apply in 77083 show up without Fort Bend County paperwork, which triggers stop-work orders and multi-week delays. We verify jurisdiction before the first call to the county.
- Beaumont clay slab heave: Room additions that ignore the expansive clay under Four Corners homes lead to slab heave, cracked brick, and racked door frames within a few wet-dry seasons. We check the existing foundation and engineer the addition for the soil, not for a generic spec.
- HOA architectural review missed: ADU plans that skip HOA architectural review in Four Corners’s master-planned communities often get rejected after the permit is already issued. The HOA has its own approval sequence, and it runs parallel to the county’s, not in place of it.
- Builder warranty voided: Homeowners who modify load-bearing walls without documenting the change order and getting inspection sign-off lose their builder warranty coverage. The warranty department is not looking for reasons to pay you. We document every step so they have no reason not to.
Pricing for Home Additions & ADU in Four Corners, TX
Here is what real projects in 77083 cost today. These ranges reflect the Fort Bend County permit fees, the post-tension slab work that most additions require, and the material costs in this part of the Houston metro.
| Project Type | Typical Range in Four Corners |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What changes the number inside those ranges? A room addition on a post-tension slab costs more than one on a raised foundation, because the slab work and reinforcement add real labor hours. A garage conversion with a full bathroom costs more than a studio with a kitchenette. Fort Bend County permit fees are separate and they scale with your valuation. We show you every line item before we start, and no number changes without a written change order you signed. Call (877) 610-1318 for a free estimate on your specific project.
We Also Serve Cities Near Four Corners
If you are not in 77083 proper, we still cover the communities around Four Corners. We work in Mission Bend and Alief regularly, and we take on projects in Pecan Grove and New Territory as well. Same owner-operated crews. Same Fort Bend County permitting discipline. Same written change orders on every job.
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 - Home Additions & ADU in Four Corners
Yes. Fort Bend County requires a permit for a garage conversion ADU regardless of square footage, because the work includes electrical, likely plumbing, and changes to the building envelope. The “under 200 square feet” exemption that some contractors reference does not apply to conditioned living space with a bed and a bath. Skipping the permit is how you end up with a stop-work order and a failed inspection record that follows the property. Call (877) 610-1318 and we will confirm the exact permit path for your address.
You document every structural change in writing, get Fort Bend County inspection sign-off at each required stage, and never cut into a post-tension cable without a locate and an engineered plan. Your builder warranty has specific language about structural modifications. We sequence the work so the county inspections happen in order, we photograph the slab before and after, and we keep a change order log your warranty department can review. The moment you hand them a clean paper trail, the warranty conversation gets much easier. Ask us to walk you through your specific warranty language before we start.
The required finished-floor elevation depends on your specific property’s flood zone designation under the 2017 FEMA map revisions. Homes near Brays Bayou tributaries in 77083 often sit in zones requiring elevation above the base flood elevation, while other parts of Four Corners fall outside the high-risk zones. Fort Bend County will pull your flood panel and set the number. We build the ADU to that elevation and document it for your certificate of occupancy. This is not a number you guess at, and it is not a number a contractor guesses at either. Call us and we will have the county pull your panel before you commit to a plan.
Your HOA’s architectural review committee gets a vote on the exterior appearance of your addition or ADU before the county gives you final occupancy. That means roofline, siding material, paint color, and even window style may need committee approval. In some of the newer master-planned communities around Four Corners, the HOA process takes two to four weeks, so we file the architectural review at the same time we submit the Fort Bend County permit. The goal is to get both approvals moving in parallel, not sequentially. We have done enough of these to know which HOAs want what, and we adjust the submittal accordingly.
A typical room addition in Four Corners runs $45,000-$130,000, and the Fort Bend County permit fees are a line item we show you upfront, typically in the low four figures depending on your project valuation. The permit fee is not hidden in “overhead.” It sits on the proposal as its own number. What drives the total is your slab condition, whether you are adding a bathroom, and whether the HOA requires specific exterior finishes. For an exact quote on your addition, call (877) 610-1318. The estimate is free, and it includes a written permit fee line.
Get Your Four Corners Home Addition or ADU Started Right
If you are thinking about a home addition, garage conversion, or detached ADU in Four Corners, start with a conversation. We will tell you what Fort Bend County requires, what your HOA will review, and what the project actually costs with the permit fees in a line item you can see. Every change order in writing. Every inspection scheduled by people who know the county system. Every price on the table before a single nail moves. Call (877) 610-1318 to schedule your free estimate.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Four Corners and the surrounding communities since 1998.