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 Wells Branch
A home addition or ADU in Wells Branch typically runs $45,000 to $130,000 for a room addition and $90,000 to $220,000 for a new detached ADU, with garage conversions landing between $30,000 and $80,000. Those are real numbers from this market, not national averages. Wells Branch’s housing stock is almost entirely tract homes built between 1985 and 1995 under the Wells Branch Municipal Utility District, which means your 30-to-40-year-old house is aging out in the same narrow window as every other house on your street. We know this neighborhood, we know Travis County’s permit process, and we know what these specific homes need. Call (877) 610-1318 for a free, written estimate – a live person picks up.
Why Barrett & Sons Construction Is Wells Branch’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998, and his sons run the crews. When we work in Wells Branch, you’re getting the owner’s name on the truck and the owner’s sons on-site most days – not a franchise dispatching strangers to your door. Every scope, every allowance, every price change arrives as a written change order before work happens. The permit inspector works for you, not for me – that’s why I like him. Travis County handles all permits and inspections for Wells Branch since it’s unincorporated, and we’ve pulled enough permits through that system to know exactly what the county will flag and what it won’t.
We’ve worked on homes along Wells Port Drive, near the Wells Branch MUD rec center, and throughout the 78728 zip code. Ask anyone on your street – or look up the license number yourself. Tom Barrett publishes his name, address, and license number. That’s how we’ve done business for over 29 years, and it’s why Wells Branch homeowners keep calling us back for their Home Additions & ADU projects.
Our Home Additions & ADU Services in Wells Branch
ADU Design & Permitting
Wells Branch sits in unincorporated Travis County, so your ADU permit runs through the county, not a city building department. That changes timelines and code-compliance expectations compared to neighboring Pflugerville or Round Rock. We handle the full Travis County permit package – drawings, setback verification, utility documentation – and we pull the permit before a single nail moves. If you’re considering an ADU on your 78728 lot, we’ll walk you through what the county will actually approve on a post-tension slab home.
Garage Conversion ADU
Garage conversions in Wells Branch typically cost $30,000 to $80,000 depending on whether you’re adding a bathroom, kitchenette, or just climate-controlled living space. Most Wells Branch garages were built as part of the original brick-veneer tract package, which means we’re usually working with a slab floor that may have shifted with the Blackland clay. We check the slab before we frame anything – cracked post-tension slab corners are common on these streets, and you don’t want to convert a garage on a shifting foundation without knowing what you’re dealing with.
New Detached ADU
A new detached ADU in Wells Branch runs $90,000 to $220,000. On these lots, the biggest factor is usually the expansive clay soil under the foundation – you need a foundation design that accounts for the boom-and-bust rain cycles of the Blackland Prairie. We’ve built detached ADUs throughout 78728 and we spec every foundation for the same soil movement we see on the existing homes. You’ll get a fixed-price scope in writing before we start, with allowances in writing and change orders in writing.
Junior ADU & Interior Conversion
Junior ADUs – converting an existing bedroom, bonus room, or interior space into a separate living unit with its own entrance – are a faster, more affordable option in Wells Branch, generally $45,000 to $130,000 depending on scope. We also handle room additions, second story additions, and sunrooms or enclosed patios for the same aging housing stock. If the interior conversion means moving plumbing, remember that these mid-80s to mid-90s homes often have original polybutylene supply lines. We’ll tell you what you’ve got before we cut into anything.
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 Wells Branch
We carry premium brands you can look up – not mystery material off a van. For ADU and addition work in Wells Branch, that often means GAF roofing membranes when we’re tying a new roofline into the existing structure, Schluter waterproofing systems when a new ADU bathroom goes in, and Sterling or Grohe fixtures when the space calls for name-brand hardware you can verify. We stock common parts and materials for Wells Branch jobs at our Austin facility, which keeps turnaround faster for customers in 78728. If a brand matters to you, ask us – if it’s not one we carry, we’ll tell you that too, and we’ll tell you what we’d use instead and why.
Common Home Additions & ADU Problems We See in Wells Branch Homes
- Slab movement from Blackland clay. Wells Branch sits on expansive clay that swells in wet years and shrinks in the 100°F+ summer droughts. Post-tension slabs from the 1985-1995 build-out carry the cracks and lifted corners that follow. Any addition that ties into the existing slab needs an engineer’s eye before framing starts.
- Original polybutylene plumbing. A large share of Wells Branch homes were plumbed with polybutylene supply lines, which are now decades past expected service life. If your ADU or addition means tapping into existing supply lines, we identify what’s there before we break ground – not after we find it behind drywall.
- Roof decking and membranes aged to failure. Central Texas heat accelerates deterioration of roofing membranes and exterior caulking, and every house in this MUD community was built in roughly the same decade. That means original roof decking is failing on whole blocks at once. Where a new addition ties into the roofline, we inspect the existing decking and call it what it is.
- Travis County permit surprises. Wells Branch is unincorporated, so you’re not dealing with a city building department – you’re dealing with Travis County’s process. That’s a different process with different expectations than Pflugerville or Round Rock. We submit complete packages the county accepts the first time, because a rejected permit is a delay you shouldn’t have to eat.
Pricing for Home Additions & ADU in Wells Branch, TX
Here’s what we actually see in Wells Branch, and these numbers hold across our written estimates. Room additions run $45,000 to $130,000. Garage conversion ADUs run $30,000 to $80,000. New detached ADUs run $90,000 to $220,000, and junior ADU or interior conversions run $45,000 to $130,000. What changes the price in Wells Branch specifically is the condition of the existing slab, whether original polybutylene lines need replacing, and how much roof structure has to be modified to tie in the new space. You’ll get a fixed-price, line-item scope in writing before we start – allowances in writing, change orders in writing, no surprise invoice at the end. Call (877) 610-1318 for a free estimate. We also offer a Free Second Opinion on any written estimate, and no trip charge inside the county.
We Also Serve Cities Near Wells Branch
Wells Branch is home base for this conversation, but our crews also work regularly in Wells Branch neighbors including Pflugerville, Anderson Mill, Jollyville, and Brushy Creek. If you’re just outside 78728, call us – the same printed pricing and written change-order policy apply wherever we go, and you’ll still get a live person on the phone.
Serving Wells Branch, TX - Our Local Coverage Area
We’re based in the Wells Branch 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 Wells Branch
Most Wells Branch projects have a 1 to 3 week start window after the permit package is submitted, depending on Travis County’s review queue. We coordinate the estimate, the written scope, and the permit in one motion so you’re not waiting on three different schedules. Call (877) 610-1318 and we’ll give you a straight answer on current timing for 78728.
Yes. We work throughout the 78728 zip code, from Wells Port Drive to the rec center area and every street in between. No trip charge inside the county. When you call, you’ll get a real person – and Tom Barrett answers his own phone.
Most of what we see isn’t an emergency – it’s slab movement, aging plumbing, and failed roof decking that shows up after we open a wall. But if we open a wall and find something that needs immediate attention, you’ll get a written change order on the spot, before any work proceeds. The allowance that isn’t on paper is a surprise waiting for a date, and we don’t operate that way. Call (877) 610-1318 to talk through what you’re seeing.
Pricing in Wells Branch is generally consistent with Pflugerville and Round Rock for the same scope, with one exception: homes here are hitting the same 30-to-40-year replacement threshold at the same time, so slab repair and polybutylene line replacement show up on more Wells Branch estimates than on newer-build neighbors. That’s not markup – that’s the actual condition of the housing stock. We’ll show you the line items, not a vague number.
Every completed job is backed by the written 90-Day Done Right Promise. It’s on the contract, not buried in fine print. If it’s not done right, Tom Barrett comes back and makes it right – one call. That applies to every addition and ADU we build in Wells Branch and everywhere else we work.
Get Your Free Wells Branch Home Addition Estimate
You’re not ready to buy – you’re ready to price. We get that. Call (877) 610-1318 and we’ll walk your project, talk through what’s realistic on a 1985-to-1995 Wells Branch slab, and hand you a written scope with a fixed price and a permit plan. No phone-tag, no out-of-state call center, no surprise invoice. A live person answers 24/7, and the estimate is free.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Wells Branch and the north Austin corridor since 1998.