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 Alief
A room addition or ADU in Alief typically runs $45,000-$130,000, with garage conversions landing between $30,000-$80,000 and full detached ADUs starting around $90,000. The single biggest variable isn’t the floor plan. It’s what we find when we open the walls. Homes across Alief were mostly built between 1970 and 1990 as slab-on-grade ranch houses, and thirty to fifty years of expansive clay movement, Harvey flooding, and deferred maintenance leave surprises behind the drywall. We’ve done enough of this work in the 77411 zip code to know exactly what we’re walking into. Call (877) 610-1318 for a free estimate, and we’ll start with what’s actually there, not what a brochure says should be there.
Why Barrett & Sons Construction Is Alief’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and his sons run the crews. That matters in Alief because the people who quote your addition are the same people swinging hammers in your garage two weeks later. No franchise dispatcher, no out-of-state call center. A live person answers the phone twenty-four hours a day, and Tom’s name, address, and license number are published for anyone who wants to verify them before signing. We tell customers to look us up. The permit inspector works for you, not for me, so I like him walking through every job.
What we know about Alief specifically saves homeowners real money. This is unincorporated Harris County, not City of Houston. Permits come from Harris County Engineering, and if a contractor files in the Houston Permitting Center portal out of habit, the project stalls before it starts. We pull the right permits in the right jurisdiction on every eligible job, and we bring inspectors in at the rough-in stage so issues get caught while they’re cheap to fix. Every scope change, every allowance, every surprise arrives as a written change order before work proceeds. Nothing moves without your signature.
Our crews have converted garages on Beechnut corridor blocks, built second-story additions near Alief Community Park, and pulled permits for ADUs off Bellaire Boulevard. The homes change, but one thing doesn’t: an allowance that isn’t on paper is a surprise waiting for a date. We keep it all in writing.
Our Home Additions & ADU Services in Alief
We focus on the work Alief homeowners actually need, given the age of the housing stock and the county-level permitting reality. Here’s what we do most often, including Alief Roofing and more:
ADU Design & Permitting
In Alief, this is the service that separates us from contractors who work Houston proper all week and wander into a 77411 job on a Saturday. We handle the Harris County Engineering submittal package, the site plan, the foundation letter, and the inspection schedule. You don’t chase paperwork. You get a written timeline and a permit number before we ever stage materials.
Garage Conversion ADU
Most Alief homes have attached two-car garages, and converting one is typically the fastest path to rental income or a multigenerational suite. Expect $30,000-$80,000 depending on whether we’re adding a kitchenette, a bathroom, or just framing out a studio. The catch in Alief is the original 1970s framing and slab condition. We inspect the sill plates, the moisture barrier, and the existing electrical service before we quote, because Harvey and time have done a number on a lot of these garages.
New Detached ADU
A stand-alone unit in the backyard gives you full separation and usually the best long-term rent per square foot in Alief. These run $90,000-$220,000 depending on size, finishes, and utility trenching. The Beaumont clay under Alief slabs means we’ll bring in a soils report before footing design, and we’ll detail any recommended piers or rebar reinforcement in the contract. No vague foundation language. You’ll see the plan.
Junior ADU & Interior Conversion
Sometimes the smartest addition in Alief is already inside the house. A junior ADU, which is typically a bedroom suite with its own entrance and kitchenette, runs less than a detached unit and uses existing rooflines. Interior conversions also skip the Harris County setback reviews that can add weeks to a detached build. For a lot of Alief ranch homes, this is the most practical first step.
Second Story Additions
Adding a second floor over a 1970s slab-on-grade ranch is a serious engineering decision in Alief. The clay soil expands and contracts through every wet-dry cycle, and if the existing foundation wasn’t overbuilt, a second story can cause differential settlement. We conduct a foundation assessment before any framing plan gets drawn. If the slab needs piers or reinforcement, that goes in the written scope up front, not as a surprise invoice at the end.
See how we approach the broader Home Additions & ADU process across every market we serve.
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 Alief
We carry materials that hold up in Alief’s subtropical heat and storm seasons, and we stock what local jobs need most, including Windows & Doors - Alief. For outdoor surfaces and ADU access paths, we install Belgard and Techo-Bloc pavers, because paver bases in Alief have to handle clay movement better than solid concrete. For structural framing and sheathing, we use Quikrete products for footings and slab patches, specified to handle expansive soil conditions. You can look up every brand we put in your home. Nothing comes off a mystery van.
Common Home Additions & ADU Problems We See in Alief Homes
This is the reality of adding onto a 1970s-era Alief house, and it’s why our quotes look different from the guy who’s never pulled a Harris County permit:
- Wrong-jurisdiction permits stopping the job cold. We see this constantly. A contractor files the addition in the Houston Permitting Center portal because that’s what they’ve always done. Harris County Engineering has separate fee schedules and inspection workflows. The job gets flagged, the permit gets rejected, and the homeowner waits weeks with a torn-apart house. We file in the correct jurisdiction from day one.
- Expansive clay heaving the foundation. Alief sits on Beaumont clay, and it swells when wet and shrinks when dry. Adding square footage without assessing the existing slab means new cracks appear in the addition during the first wet season. Our foundation letter and soils report are part of the permit submittal, not an optional upsell.
- Hidden Harvey flood damage behind drywall. Whole subdivisions in Alief went under water in 2017. Bottom plates rotted, studs wicked moisture, termites moved into the damp framing. A garage conversion or room addition that doesn’t account for that can double in cost once walls are opened. We inspect first, then write the real scope.
- August weather stalling exterior work. Alief’s May-to-September heat window and Gulf storm season can delay framing, roof ties, and deliveries. If the contract doesn’t include a weather delay allowance, the schedule and the draw schedule both fall apart. Ours includes it in writing before we start.
Pricing for Home Additions & ADU in Alief, TX
Here’s the honest math for Alief. A room addition runs $45,000-$130,000. A garage conversion ADU lands between $30,000 and $80,000. A detached ADU starts at $90,000 and can reach $220,000 for a larger unit with full kitchen and bath. The spread depends on square footage, finishes, foundation work, and what we find inside the existing walls. We’ll show you every line item.
| Project Type | Alief Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
| ADU Site Prep & Utilities | Quoted per job after site survey |
| Junior ADU & Interior Conversion | Quoted per job after walkthrough |
No allowance stays verbal. If the framing is undersized or the slab needs piers, that becomes a written change order with a fixed price before we touch it. Call (877) 610-1318 and we’ll walk your Alief property together before we put a single number on paper. Estimates are free, and there’s no trip charge inside the county.
We Also Serve Cities Near Alief
Barrett & Sons Construction runs crews through Alief and the surrounding communities every week. If you’re in Four Corners, Mission Bend, Stafford, or New Territory, give us a call at (877) 610-1318. Same written change orders, same permits pulled, same 90-Day Done Right Promise.
Serving Alief, TX - Our Local Coverage Area
We’re based in the Alief 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 Alief
Yes, you need a Harris County permit, not a City of Houston permit. Alief is unincorporated, so Harris County Engineering issues the permit, runs the inspections, and enforces the code. Converting a garage to living space triggers structural, electrical, plumbing, and sometimes floodplain review. We handle the full submittal package so you never sit in the wrong waiting room. Call (877) 610-1318 and we’ll check your specific lot against current Harris County requirements before you spend a dollar on design.
Expect three common issues in a 1970s Alief ranch: undersized framing that doesn’t meet current load codes, moisture damage in bottom plates and sill areas from years of high humidity and occasional flooding, and outdated wiring that can’t support a modern addition’s electrical load. Any of these can move the quote, which is why we inspect before we quote, write allowances into the contract, and price every discovery as a written change order. Call (877) 610-1318 to schedule a walkthrough of your specific home.
The Beaumont clay under Alief swells when wet and shrinks when dry, which means the slab you have now has already moved through decades of wet-dry cycles. Adding a second story concentrates new load on the foundation. If the slab wasn’t overbuilt, you can get differential settlement and new cracks within the first season. We run a foundation assessment and soils review before any second-story addition gets framed, and any needed piers or slab reinforcement go in the written scope. Call (877) 610-1318 for an evaluation of your existing slab.
You may need floodplain review and possibly elevation or flood-mitigation measures, depending on your lot’s current FEMA designation and the scope of the addition. Alief sits in the Brays Bayou watershed, and Harris County takes post-Harvey flood exposure seriously. Some ADU projects in flood-prone parts of Alief require sealed engineering for flood vents, elevated mechanicals, or specific foundation details. We pull the floodplain determination during permitting and tell you exactly what applies before you commit. Call (877) 610-1318 so we can check your address against current Harris County floodplain maps.
You get a written change order before a single nail moves. The price, the new scope, and the reason for the change go on paper and you approve it first. No surprise invoices, no scope creep. That’s been the rule since Tom founded Barrett & Sons in 1998, and we put it in writing on every contract. Call (877) 610-1318 and we’ll walk the project with you so you know exactly what is already covered and what might come up.
If you’re planning a Home Additions & ADU project in Alief, call Barrett & Sons Construction at (877) 610-1318. We’ll start with a free estimate, pull the right Harris County permits, and put every price change in writing before the first hammer swings. The 90-Day Done Right Promise is on the contract, signed by Tom Barrett himself.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Alief for over 29 years across Harris County.