Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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After
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AfterFast, Reliable Home Additions & ADU Across Webster
Adding space to a Webster home usually costs between $45,000 and $130,000, and a stand-alone ADU in 77598 typically runs $90,000 to $220,000. Those are real numbers from real jobs we’ve done around this area, not phone quotes that change when someone finally walks your property. If you’re weighing a room addition, garage conversion, or a full detached ADU in Webster, we’re the crew that shows up when we say we will and puts every price in writing before a single nail moves. Call (877) 610-1318 and we’ll schedule a free estimate at your home.
We’ve worked enough jobs along I-45 and through the neighborhoods behind the medical center to know that Webster is its own animal. Flood maps, slab movement, and post-Harvey building rules all shape what gets built here and how much it costs. Homeowners on the back streets of 77598, the neighborhoods east of Highway 3, and the older subdivisions off NASA Parkway deal with the same underlying issues: expansive clay, humidity that never quits, and a permitting path that rewards contractors who’ve done this before. That’s us. Barrett & Sons Construction has been owner-operated since 1998, and Tom Barrett, his sons, and their crews are the ones who show up on your job in Webster.
Why Barrett & Sons Construction Is Webster’s Preferred Home Additions & ADU Company
We are not a franchise dispatching strangers from three counties away. Tom Barrett lives close enough to Webster that if something isn’t right, he hears about it at the hardware store before you have to make a second call. That’s the difference people in Webster tell us they were looking for after a bad experience with a national outfit: a name they can verify, a face they see again, a contractor who answers his own phone. Every job we take in Webster comes with the 90-Day Done Right Promise written on the contract. If it’s not done right, one call brings Tom back.
Our crews in Webster carry the Barrett & Sons name on their trucks and their shirts, and they’re background-checked before they ever step on your property. We pull permits and get inspections signed on every eligible job, because we’ve repaired too many additions in Webster where the last contractor said permits were optional. Tom’s name, address, and license number are published and verifiable. Look them up before you sign anything. Then call us at (877) 610-1318.
Our Home Additions & ADU Services in Webster
ADU Design & Permitting
Our Home Additions & ADU team starts every Webster ADU project the same way: a survey of your site, a hard look at your flood zone and set lines, and a design drawn to the actual Harris County rules that apply to 77598. Webster sits in a FEMA-designated flood zone, and Harris County adopted strict freeboard requirements after Harvey that demand new structures be built 2 feet above the base flood elevation. We handle the design, the permit submittal, and the inspections, so you never have to argue with a reviewer who wants a detention pond note on a sub-1,000-square-foot ADU.
Garage Conversion ADU
Converting a garage in Webster is often the smartest dollar-per-square-foot move, because the slab and the roof are already there. We see a lot of homes in the 1970s and 1980s neighborhoods around the Johnson Space Center area where a two-car garage has become a storage locker for someone else’s college furniture. We turn it into a legal, permitted dwelling unit with proper insulation, moisture barriers, and independent utilities. Typical garage conversions in Webster run $30,000 to $80,000.
New Detached ADU
A new detached ADU in Webster gives you the most flexibility: a guest house, a rental unit, or a quiet place for aging parents who want to stay close without sharing a hallway. We build these on pier-and-beam or slab foundations engineered for the expansive Beaumont clay that’s famous around here for shifting and settling. New detached ADUs in Webster typically run $90,000 to $220,000, and that price includes the engineering, permit fees, and the two-foot freeboard compliance that Harris County requires.
Junior ADU & Interior Conversion
A junior ADU carves out space you already own: a finished attic, an oversized bonus room, or a sunroom you never use. This route works well in Webster because many of the older homes off Highway 3 have floor plans with dead square footage waiting for a purpose. We handle the whole thing as a Webster project: plans, permits, insulation, egress windows, and a kitchenette or bath as budget allows. If you’re also thinking about upgrading the main house, we handle Kitchen Remodeling in Webster and Bathroom Remodeling in Webster too, so the whole plan can come together with one crew.
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 Webster
When we frame, finish, and outfit a Webster addition or ADU, we use materials you can look up instead of mystery brands off a truck. For windows and doors on our Webster additions, we install Simonton and PGT units, and for impact-rated openings in flood- and wind-prone parts of 77598, PGT and CGI both make a difference when a Gulf storm puts pressure on your new envelope. Andersen and Marvin are available for homeowners who want to upgrade. Ply Gem trim and siding holds up to the humidity and UV that beats down on Webster’s coastal plain position year-round. We keep local suppliers in the loop so your project doesn’t stall waiting on a truck from another market.
Common Home Additions & ADU Problems We See in Webster Homes
- Foundation movement from the “Houston gumbo” clay. Webster’s homes sit on slab-on-grade construction over expansive Beaumont clay that shrinks and swells with every wet-dry cycle. We see additions and ADUs where the original builder skipped proper pier depth or slab joints, and the result is cracked drywall, sticking doors, and a new structure that’s moving independently of the main house.
- Moisture intrusion from Harvey-era flooding. Many Webster homes took water in 2017, and hidden moisture in wall cavities is still causing problems years later. When we open up a wall for an addition or conversion, we put vapor barriers and drying details in the spec whether the owner asked for them or not.
- Noncompliant garage conversions done on the cheap. We see garage conversions in Webster where the previous owner threw up drywall and a window AC unit without permits. The floor isn’t insulated, the electrical isn’t separated, and the city won’t recognize it as a legal dwelling. We fix these by bringing them to code before adding any new square footage.
- Roof and siding failures from Gulf humidity and UV. Webster’s 90% summer humidity and intense sun accelerate caulk, coating, and exterior cladding failures faster than inland Texas markets. When we attach a new addition to an older Webster home, we’re matching not just the roofline but the moisture management system, so the junction between old and new doesn’t become a leak point.
Pricing for Home Additions & ADU in Webster, TX
Here’s what you should expect to pay for a home addition or ADU in Webster based on jobs we’ve done in 77598. A standard room addition runs $45,000 to $130,000 depending on square footage, foundation work, and finish level. A garage conversion ADU runs $30,000 to $80,000. A new detached ADU runs $90,000 to $220,000, with most Webster homeowners landing between $120,000 and $180,000 for a one-bedroom with a kitchenette and full bath. A junior ADU or interior conversion runs $45,000 to $90,000 depending on whether you’re adding plumbing fixtures. What moves the price in Webster specifically is the foundation engineering for expansive clay, the post-Harvey floodplain compliance on your lot, and the cost of pulling permits through Harris County. We give free written estimates with line-item pricing, and every change order comes in writing before work proceeds. Call (877) 610-1318 to schedule yours.
We Also Serve Cities Near Webster
If you live just outside Webster, we take jobs in the surrounding area every week. We work in Home Additions & ADU in Webster and the neighboring communities including Friendswood, League City, Seabrook, and Pasadena. Same crew, same written pricing, same 90-Day Done Right Promise.
Serving Webster, TX - Our Local Coverage Area
We’re based in the Webster 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 Webster
We typically schedule Webster estimates within a few business days, and a live person answers the phone 24 hours a day. Call (877) 610-1318 and we’ll find a time that works. There’s no trip charge inside Harris County.
Yes, we cover all of 77598, including the residential pockets east of Highway 3, the older subdivisions off NASA Parkway, and the neighborhoods on both sides of I-45. If you’re in Webster, we’ll come out, walk the property, and give you a written estimate.
It very likely does. Harris County adopted 2-foot-above-BFE freeboard requirements after Harvey, and Webster sits in a FEMA-designated flood zone. We handle the engineering and permit submittal so your new structure meets those rules without surprises. That’s a real savings versus hiring someone who finds out about the floodplain rule after the foundation is poured.
Our pricing doesn’t change based on zip code. The same room addition in Webster, League City, or Pasadena costs you the same amount because we price the job, not the market. What changes is the permitting and site prep, which we’ll spell out in your written estimate. All estimates are free.
Every job comes with the 90-Day Done Right Promise written on the contract. If something isn’t done right, one call brings Tom Barrett back to make it right. Call (877) 610-1318 and ask about the warranty before you sign anything.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Webster and the surrounding communities since 1998.