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 Spring
A home addition in Spring, TX typically runs $45,000 to $130,000 depending on scope, and a new detached ADU lands between $90,000 and $220,000. Those numbers cover real costs we see weekly across 77379, 77380, 77381, and 77382. The difference between a smooth project and a nightmare usually comes down to one thing: whether the contractor knows which side of the county line your house sits on before the first permit gets pulled. We do. Call (877) 610-1318 and we’ll walk your property, check your ZIP, and give you a written estimate that accounts for Spring’s unique two-county reality.
Spring isn’t one jurisdiction. It straddles Harris and Montgomery Counties, and that split changes everything about your Home Additions & ADU project. A room addition off the back of a 1980s ranch in 77379 follows Harris County permit rules. The same addition twenty minutes away in 77381 falls under Montgomery County. That’s two different permit packages, two inspection schedules, and two floodplain management frameworks. If your contractor doesn’t know this before quoting, you’ll find out mid-project. We’d rather you find out from us before you sign anything.
Key Takeaways:
- Home additions in Spring run $45,000-$130,000; ADUs run $90,000-$220,000; garage conversions run $30,000-$80,000.
- Your Spring ZIP code determines which county permit you need, and The Woodlands ZIPs add a community association review.
- Every scope change gets priced in writing before work starts. No allowances hiding in a verbal handshake.
- We’ve been building in this two-county market since 1998. Tom Barrett’s name is on the truck and the contract.
Why Barrett & Sons Construction Is Spring’s Preferred Home Additions & ADU Company
We’re not a franchise dispatching strangers to Spring from three states away. Tom Barrett founded this company in 1998, and his sons run crews here. That means the person who shakes your hand at the first walkthrough is the same family that will show up when the framing inspection happens. Our Home Additions & ADU in Spring work has built a reputation the old-fashioned way: permits pulled, inspections signed, and a 90-Day Done Right Promise written into every contract. If something’s not right after we finish, one call brings Tom back. That’s not a marketing line. It’s in writing.
Spring customers call us because previous contractors burned them. We hear it constantly: the out-of-town crew quoted a flat price, got halfway through demo, then hit outdated wiring or a cracked slab and suddenly there’s a surprise invoice. We handle that differently. Every allowance goes on paper before work begins. Every price change arrives as a written change order before a single nail moves. And if you want to verify who you’re hiring, Tom publishes his name, address, and license number. Look it up. We expect you to.
Our response time to Spring is straightforward: a live person answers the phone at (877) 610-1318 24 hours a day, seven days a week. Not a voicemail box. Not an out-of-state call center. When you call about an addition, you’ll talk to someone who knows the difference between a Harris County permit package and a Montgomery County one. And we don’t charge for the trip inside the county.
Our Home Additions & ADU Services in Spring
Room Additions
Most room additions in Spring are attached to 1980s and 1990s oil-boom tract homes built on slab foundations over Beaumont clay. That clay shrinks and swells with Houston’s wet-dry cycles, which means we always check for slab movement and door-frame racking before we design anything. A room addition on a home near Spring Creek needs grading and drainage planning that a contractor from Dallas wouldn’t think to do. We plan for it because we build here.
ADU Design & Permitting
ADU permitting in Spring depends entirely on your ZIP code. A detached ADU in 77379 follows Harris County rules plus FEMA floodplain requirements if your parcel sits in a revised Special Flood Hazard Area along Spring Creek. The same ADU in 77382 falls under Montgomery County and likely needs Woodlands Community Association review for impervious cover limits, tree mitigation, and exterior material palettes. That review can add three to six weeks to your schedule. We factor it into the timeline from day one, not as a surprise after demo starts.
Garage Conversion ADU
Converting a garage in Spring typically costs $30,000 to $80,000 depending on whether you’re doing a basic living space or a full ADU with kitchen and bath. The catch: many Spring garages share the slab-pour problems of the main house. We inspect the concrete, check for moisture intrusion from the humid climate, and bring everything up to current code before we frame the conversion. In The Woodlands ZIPs, your garage conversion may also need association sign-off on exterior changes. We handle that paperwork.
Junior ADU & Interior Conversion
A junior ADU inside an existing Spring home runs on the lower end of the ADU range because you’re not pouring a new foundation or running separate utilities. But don’t assume “interior” means simple. Opening walls in a 1980s Spring home frequently turns up outdated wiring, undersized framing, and moisture damage from years of clay-soil movement. We inspect first, write the corrections into a change order, and get your approval in writing before we proceed. No mid-project surprises.
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.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Spring
If your Spring addition or ADU needs windows, we install Simonton, Ply Gem, and PGT. These are brands you can look up, not mystery products off the back of a van. For impact-rated windows on a Spring home near the floodplain or in a deed-restricted community, PGT and CGI both make products that meet the stricter wind and water codes. We keep relationships with local suppliers, which means faster turnaround on material orders and fewer scheduling delays when you’re already waiting on a county permit or a community association review.
Common Home Additions & ADU Problems We See in Spring Homes
- Wrong county permit pulled. In Spring, a single street can split Harris and Montgomery County jurisdiction. An out-of-area contractor pulls the wrong permit type, work gets stopped, and you eat double inspection fees. We verify your ZIP and county before anything gets filed.
- Clay-soil movement cracking walls and racking door frames. Spring’s expansive Beaumont clay shrinks in drought and swells after rain. Additions built without accounting for this end up with cracked brick veneer and sticking doors within a few years. We assess slab condition and drainage before design.
- Woodlands Community Association review skipped. ADUs and garage conversions in 77380-77382 can trigger association review for impervious cover, tree preservation, and exterior finishes. Skipping this step means a forced redesign after demo begins. We file the paperwork upfront.
- Outdated wiring and failed waterproofing hidden in 1980s walls. When we open a wall for a room addition, we regularly find aluminum wiring or moisture-damaged subfloor from years of humidity and slab movement. We write every correction into a change order and get your written approval before we fix it.
Pricing for Home Additions & ADU in Spring, TX
Here are the numbers for Spring, straight from our recent estimates:
| Project Type | Typical Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What moves the price in Spring more than anything else is what’s hiding behind the drywall. A 1980s tract home near Spring Creek might have undersized framing, outdated wiring, or moisture damage from clay-soil movement. If your contractor didn’t build allowances for that into the contract, you’ll get a bill mid-project. We write those allowances in from the first walkthrough. Every price change arrives as a written change order before work proceeds. Call (877) 610-1318 for a free written estimate. No trip charge inside the county.
We Also Serve Cities Near Spring
Beyond Spring, we serve Spring neighbors in The Woodlands, Tomball, Aldine, and Jersey Village. Same crew, same family, same 90-Day Done Right Promise. If you’re planning a home addition or ADU just outside Spring’s ZIP codes, call us at (877) 610-1318 and we’ll tell you which county you’re dealing with.
Serving Spring, TX - Our Local Coverage Area
We’re based in the Spring 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 Spring
Yes, every Spring home addition requires a permit, but which county issues it depends on your ZIP code. Addresses in 77379 fall under Harris County; 77380, 77381, and 77382 are Montgomery County. Each has different permit types, inspection schedules, and floodplain rules. We verify your county before filing anything. Call (877) 610-1318 for a free site assessment and we’ll tell you exactly which permit package applies to your address.
Yes, in most cases garage conversions and detached ADUs in The Woodlands ZIPs of 77380, 77381, and 77382 require Woodlands Community Association review on top of the Montgomery County permit. The association checks impervious cover limits, tree-removal mitigation, and exterior material palettes. Expect three to six weeks added to your schedule. We file the association paperwork alongside the county permits so nothing stalls after demo. Call (877) 610-1318 and we’ll walk you through it.
Post-Hurricane Harvey, FEMA revised flood zone maps across the Spring Creek corridor, reclassifying thousands of parcels. If your ADU site sits in a revised Special Flood Hazard Area, you’ll face new elevation and freeboard requirements that govern the foundation height and drainage design. We check your parcel against current FEMA maps before we design anything, so your ADU meets floodplain code from day one. Call (877) 610-1318 for a free estimate that includes floodplain verification.
We write it into a change order before we fix it. You’ll get the correction priced in writing, and nothing happens until you approve it. On a 1990s tract home in the Spring Creek corridor, our crew opened a wall for a room addition and found undersized framing and moisture-damaged subfloor from clay-soil movement. We wrote the repair into a change order, fixed the load-bearing structure, and brought the rough-in up to code before inspection sign-off. No surprises, because every allowance was in the contract from the first walkthrough. Call (877) 610-1318 for a free estimate that includes a written allowance schedule.
Because a draw schedule ties payments to completed, inspected milestones rather than letting a contractor collect everything upfront. In Spring’s two-county market, that protects you from paying for framing before the county inspector signs off. Our payment schedule follows the work: permit issuance, foundation, rough-in inspections, drywall, and final walkthrough. You pay for what’s done, not what’s promised. Call (877) 610-1318 for a free written estimate with a draw schedule you can review before signing anything.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Spring since 1998.