Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterFast, Reliable Home Additions & ADU Across Humble
Adding square footage in Humble is different than it is in Houston’s drier western suburbs. Your addition or ADU has to answer to the San Jacinto River watershed, Harris County floodplain ordinances, and expansive black clay that moves every wet-dry season. We know that because we work those ZIP codes every week, 77338 through 77396 and all of 77346’s Atascocita corridors. If you’re planning a room addition, a garage conversion ADU, or a new detached ADU in Humble, call (877) 610-1318. We’ll walk your lot, pull the elevation certificate if it’s needed, and price the job in writing before anything gets nailed down.
Why Barrett & Sons Construction Is Humble’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and his sons run the crews. That matters in Humble because we’re not a franchise dispatching strangers to Atascocita. Our crew members are background-checked, uniformed, and they answer to the name on the truck. Tom’s name, address, and license number are published. You can look them up before you sign anything, and we encourage you to.
We’ve worked post-Harvey rebuilds across 77346 and the older Humble core in 77338. We know what a flood line behind drywall looks like and why it changes the scope of an addition. We also know the permits and inspections that keep you compliant, because we’ve sat through enough of them to know what Harris County’s floodplain office asks for on every single project. That’s the kind of local knowledge that keeps your final inspection from turning into a redo.
Every job we do in Humble comes with a written 90-Day Done Right Promise. If something isn’t right, Tom comes back. One call. It’s on the contract, not buried in fine print. And every scope change, every allowance, every price adjustment shows up as a written change order before work proceeds. No surprise invoices at the end.
Our Home Additions & ADU Services in Humble
ADU Design & Permitting
In Humble, a compliant ADU permit package is heavier than most contractors admit. You need the site plan showing finished floor elevation, the floodplain determination letter if the parcel touches a mapped flood zone, wind-load calculations for the structure, and the elevation certificate if the existing home or slab is in 77346’s Atascocita corridor. We prepare all of it. A cheap quote skips the elevation certificate and the wind-load calcs, and the permit office catches it. Then you pay twice.
New Detached ADU
A new detached ADU in Humble typically runs $90,000-$220,000 depending on square footage, foundation type, and finish level. If you’re building behind a 1990s slab home in Atascocita, we strongly recommend a pre-design flood-history check. Many of those homes were gutted after Harvey and rebuilt to code but never elevated. Your new ADU’s finished floor should account for the freeboard requirements above base flood elevation, not just match the old slab’s grade. We can design that from the start.
Garage Conversion ADU
Garage conversions in Humble run $30,000-$80,000. The biggest trap is leaving the original slab at grade and treating the conversion as a remodel. New living area means new freeboard requirements. We’ve seen certificates of occupancy denied in the older Humble core because the converted slab didn’t meet floodplain rules for habitable space. We check the flood status before we draw a single line.
Junior ADU & Interior Conversion
Interior conversions inside an existing home, like turning a den into a junior ADU with its own entrance and kitchenette, are the fastest way to add rentable or multigenerational space in Humble. Pricing is often lower than a detached unit, but the floodplain compliance questions don’t disappear. We run the same checklist: elevation certificate if applicable, soil movement expectations for the addition, and drainage integration so you don’t direct water toward your own foundation.
You can read more about how we approach this kind of work on our Home Additions & ADU service page.
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.
Trusted Brands We Service in Humble
We carry materials you can look up, not mystery brands off a van. For hardscape and drainage work tied to ADU site prep in Humble, we regularly install Techo-Bloc and Oldcastle products. For foundations and slab work on additions and detached units, we use Quikrete mixes specified for expansive clay conditions. If you want Cambridge Pavers for a walkway or patio tied to your ADU, we can order that too. We stock common parts locally for Humble jobs, which means fewer delays when the permit office flags something and we need to make a quick change.
Common Home Additions & ADU Problems We See in Humble Homes
- A permit gets pulled but the floodplain status was never checked. In 77338 and 77346, this is the most expensive mistake we see. A foundation that settles and cracks after the first heavy rain usually traces back to a contractor who skipped the floodplain determination and the soil report on Harris County’s expansive black clay.
- An ADU is built as a garage conversion with the original slab at grade. The work passes inspection, but the certificate of occupancy gets denied because freeboard requirements for habitable space were never addressed. Now the homeowner pays for re-engineering or a torn-out slab.
- A low bid excludes allowance line items for storm-rated impact windows. After installation, the inspector flags the windows as non-compliant with wind-load requirements for Humble. Tear-out and re-purchase follow. The written change order you never saw is the one that costs the most.
- A post-Harvey home in Atascocita gets an addition without a flood-history check. The home was gutted and rebuilt but never elevated. The new addition ties into a finished floor that sits only inches above base flood elevation. The insurance company later asks for documentation the homeowner doesn’t have.
Pricing for Home Additions & ADU in Humble, TX
In Humble, a room addition typically runs $45,000-$130,000. A garage conversion ADU runs $30,000-$80,000. A new detached ADU runs $90,000-$220,000. What moves the number most is whether your lot sits in a mapped flood zone, whether the existing slab meets current freeboard rules, and whether wind-load compliance requires upgraded windows, strapping, or engineered headers. We price with allowances in writing and change orders in writing. Below is how those line items break out for Humble specifically.
| Project Type | Typical Range in Humble |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
Call (877) 610-1318 for a free estimate. We’ll walk the property, check the floodplain status, and give you a written line-item quote. No trip charge inside Harris County.
What Humble’s Floodplain and Wind-Load Rules Actually Require
This is the part most pages about Humble skip, and it’s the part that matters most. Humble sits squarely in the Lake Houston/San Jacinto River watershed, one of the most repeatedly flooded suburban corridors in the country. Harvey in 2017 inundated thousands of homes across 77338 and 77346. Construction here is overwhelmingly shaped by FEMA floodplain compliance: elevation certificates, freeboard requirements above base flood elevation, and a steady pipeline of post-flood rebuilds and elevation projects. That’s not true in Sugar Land. It’s not true in Pearland. It is true in Humble.
For a home addition or ADU in Humble, a compliant quote includes several line items a cheap bid leaves out. First, the elevation certificate if the existing structure is in a mapped flood zone or if the parcel touches one. Second, the floodplain determination letter from Harris County. Third, wind-load calculations for the new structure, because Humble’s storm exposure rating drives window and framing specs. Fourth, soil movement planning for the expansive black clay that shifts dramatically between wet and dry seasons. Fifth, drainage integration like French drains or raised finished floors so your new addition doesn’t funnel water toward your old foundation.
A cheap quote omits the elevation certificate. It omits the wind-load calcs. It omits the soil report. The permit office catches it, or the inspector catches it, or the insurance company catches it later when you file a claim and they ask for documentation you never received. The inexpensive bid becomes the expensive one.
In the Walden on Lake Houston section of Atascocita in 77346, our crew added a 400-square-foot primary suite over a post-Harvey slab that had been gutted but never elevated. Before framing, we pulled the home’s elevation certificate and found the finished floor sat only 11 inches above base flood elevation. Technically compliant but tight. We raised the addition’s subfloor on engineered pier-and-beam, installed a French drain tied to the existing yard swale, and used load-bearing LVL headers at the new opening. The permit passed final inspection sign-off with no change orders.
If you’re planning an addition or ADU anywhere in Humble, ask your contractor these questions before you sign: Can you show me the elevation certificate? What wind-load rating does the new structure meet? What’s the freeboard requirement on this parcel? If they can’t answer all three, that’s your answer. Call (877) 610-1318 instead. We’ll answer.
We Also Serve Cities Near Humble
Barrett & Sons serves homeowners across Home Additions & ADU in Humble and the surrounding communities, including Atascocita, Aldine, Jacinto City, and Cloverleaf. If you’re just outside town and wondering whether we cover your street, call (877) 610-1318. If you’re inside Harris County, there’s no trip charge.
Serving Humble, TX - Our Local Coverage Area
We’re based in the Humble 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 Humble
Yes, in most cases. If your home sits in a mapped flood zone or its lot touches one, Harris County’s floodplain office will require an elevation certificate before the permit is issued for a second-story addition. In 77346 specifically, many post-Harvey homes were rebuilt but never elevated, and their finished floors sit dangerously close to base flood elevation. Pull the certificate first, not after you’ve started framing. Call (877) 610-1318 and we’ll check the floodplain status on your parcel before you spend a dollar on design.
Humble’s storm exposure requires wind-load calculations for any new detached structure, and the specific rating depends on your parcel, the ADU’s height, and its exposure category. The permit office will ask for stamped wind-load calcs, and the windows and framing must match those calcs. Storm-rated impact windows are typically required in the package. If your quote doesn’t mention wind-load calcs at all, that’s a red flag. Call (877) 610-1318 and we’ll explain what your specific lot requires.
Documented compliance can lower your premium or keep a claim from being denied. When you file a claim after a storm or flood event, the insurer will ask for evidence that the structure met code at the time it was built or renovated. An elevation certificate and wind-load approval letters from your permit package are exactly what they’re looking for. If you can’t produce them, the claim gets complicated fast. We document every compliance item in writing and hand it to you at final inspection. That’s part of the 90-Day Done Right Promise and part of every job we do in Humble.
Yes, and many contractors miss it. A garage conversion turns non-habitable space into habitable space, which triggers freeboard requirements that didn’t apply to the original garage. The slab that was fine for parking a car may not meet the elevation standard for a bedroom or kitchen. In 77338, where much of the housing stock dates from the 1950s through 1970s on low-grade slabs, this is a frequent final-inspection failure. A new detached ADU starts from the current code requirements for new habitable space. Both need the floodplain determination letter, but the garage conversion has more retrofit risk. Call (877) 610-1318 for a free estimate, and we’ll check the slab elevation before quoting.
A compliant package includes the site plan with finished floor elevation, the floodplain determination letter from Harris County, the elevation certificate if required, stamped wind-load calculations, and drainage integration plans for the black clay soil. A cheap quote includes the site plan and maybe the building drawings. It omits the elevation certificate, the wind-load calcs, and the soil report. Then the permit office flags it, the price changes, and you’re back on the phone. We build the full package into every quote. Call (877) 610-1318 and we’ll show you the difference in writing.
Written by Tom Barrett, Owner at Barrett & Sons Construction. Tom answers his own phone and stands behind every job with a written 90-Day Done Right Promise. Call (877) 610-1318 to schedule your free estimate in Humble.