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 Cedar Park
Home additions and ADU construction in Cedar Park typically run $45,000-$130,000 for a room addition, and $90,000-$220,000 for a new detached ADU, with garage conversions landing between $30,000-$80,000. What most homeowners don’t hear until it’s too late: your slab and soil conditions change those numbers fast. We’re Barrett & Sons Construction, founded in 1998 and owner-operated by Tom Barrett. If you’re planning an addition anywhere from Buttercup Creek to Forest Oaks to the 78613 corridor along Parmer Lane, call us at (877) 610-1318 and we’ll walk the site before you spend a dime on plans.
Why Barrett & Sons Construction Is Cedar Park’s Preferred Home Additions & ADU Company
Cedar Park homes built in the late 1990s and early 2000s are hitting the age where problems surface all at once. We see it in Forest Oaks, Buttercup Creek, and the Rancho Cedar Park subdivisions: slabs poured on Vertisol clay during dry years, drainage grades settling toward foundations, and homeowners who want more space but have no idea what’s under their feet. Tom and his sons run the crews themselves. We’re on site in Cedar Park regularly, and we know what the 78613 and 78630 soils do when November rains hit after a dry July.
Every job we take in Cedar Park includes permits pulled and inspections signed. That’s not a sales line. When you cut into a post-tension slab or tie a new footing into an existing foundation in this soil, the inspector is your protection. We put every scope, every allowance, every price change on paper as a written change order before work starts. No surprise invoices at the end. And every job carries our 90-Day Done Right Promise, written on the contract: if it’s not done right, Tom comes back and makes it right. One call.
Cedar Park homeowners have dealt with the other kind of contractor already. That’s why we publish Tom’s name, address, and license number. Look us up before you sign anything. A live person answers our phone 24/7, not a voicemail box in another state.
Our Home Additions & ADU Services in Cedar Park
We handle the full scope of Home Additions & ADU work, and in Cedar Park the engineering drives everything. Here’s what we do most.
ADU Design & Permitting
Before a shovel touches Cedar Park clay, the plans have to account for expansive soil, post-tension slab constraints, and the city’s wind zone. We pull permits and work with the inspections through final sign-off. The permit inspector works for you, not for me, and that’s the way we like it.
Garage Conversion ADU
Converting a garage in Cedar Park usually means adding plumbing where none exists, which often means cutting into a post-tension slab. That’s not a casual sawcut. We GPR-scan first, locate the cables, and design around them or brace accordingly. Skipping that step can sever a cable and compromise the entire foundation. We don’t skip it.
New Detached ADU
A detached ADU on Cedar Park’s shrink-swell clay needs a foundation that moves with the soil, not against it. We engineer footings for the movement you actually get here, not the movement a generic plan assumes. And in a severe hail corridor, our Roofing in Cedar Park matters more than most builders admit.
Junior ADU & Interior Conversion
Interior conversions don’t touch the perimeter soil as much, but they still mean slab cuts for plumbing and electrical chases. Same GPR protocol, same written change orders, same permit discipline. Cedar Park homes built during the boom years often surprise us with what’s under the slab.
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 Cedar Park
We install and service windows from Simonton, Ply Gem, and PGT in Cedar Park homes. These brands matter because the 110-mph wind zone requirement is real, and a window that meets Miami-Dade or TDI wind-load standards is a different product than what the big-box store sells off the shelf. For your Home Additions & ADU in Cedar Park project, we spec the right glass, frames, and flashing for what our wind and hail actually do. When your addition’s window fails two years in because a cheap unit flexed in a storm, the savings disappear. We’d rather install the right one the first time.
Common Home Additions & ADU Problems We See in Cedar Park Homes
- Post-tension slab cuts without GPR scanning. In Cedar Park’s early-2000s subdivisions, slabs poured during drought conditions have moved significantly. A contractor who cuts blind can sever a tension cable and turn a $60,000 room addition into a foundation failure. We scan before every cut.
- New slabs tied directly to existing post-tension slabs without an expansion joint. When the Vertisol clay shrinks in drought, the two slabs pull apart and crack. The fix is an engineered expansion joint, something a low bid conveniently omits.
- Skipped perimeter regrading. In Forest Oaks and other boom-era neighborhoods, drainage grades were set to builder minimum and have since settled toward the slab. Stormwater now drains toward new footings instead of away. We regrade the perimeter and reroute downspouts before interior work is warranted.
- Roof assemblies that don’t meet Cedar Park’s wind-load requirements. This region sits in a severe hail corridor. A cheap roof on a new sunroom or detached ADU won’t survive the next big storm, and your insurer may not cover it if the work wasn’t documented to code.
Pricing for Home Additions & ADU in Cedar Park, TX
Here are the ranges we quote in Cedar Park, based on current material and labor costs in the local market.
| Project | Typical Cedar Park Range |
|---|---|
| Room Addition | $45,000 - $130,000 |
| New Detached ADU | $90,000 - $220,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
What moves the number in Cedar Park specifically: whether GPR scanning reveals post-tension cable conflicts, whether the perimeter drainage needs full regrading before footings go in, and whether the roof assembly needs a higher wind rating than the original structure. These aren’t upsells. They’re what the soil and the storm corridor demand. Call (877) 610-1318 for a free written estimate with real line items, not a phone number and a handshake.
We Also Serve Cities Near Cedar Park
Our crews cover Cedar Park and the surrounding communities, including Brushy Creek, Anderson Mill, Jollyville, and Leander. If you’re just outside the city line, call us. We’ll tell you straight whether we’re the right crew for your job.
Serving Cedar Park, TX - Our Local Coverage Area
We’re based in the Cedar Park 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 Cedar Park
Yes, in most Cedar Park additions we require a soils report before final engineering. The Vertisol clay under this city moves several inches between drought and heavy rain cycles, and a room addition tied to an existing post-tension slab has to be designed for that movement. A soils report tells us exactly how your lot behaves. Call (877) 610-1318 and we’ll explain what your specific property needs, free.
A detached ADU roof in Cedar Park needs to meet the local wind-load requirements for the 110-mph wind zone, which means rated roof decking, fasteners, and flashing assemblies. In a severe hail corridor, we also recommend impact-rated roofing products that documented compliance supports. If your quote doesn’t mention wind rating in writing, it’s not a Cedar Park quote. Call (877) 610-1318 for a line-item estimate that spells out the wind-load specification.
Sometimes, but not usually. Plumbing rough-in for a bathroom or kitchenette in a garage conversion typically requires cutting the slab, and in Cedar Park that slab is post-tensioned. If you’re considering Bathroom Remodeling in Cedar Park, we start with the same careful prep. We GPR-scan first to locate embedded steel cables before any cut. The alternative is routing waste lines along the perimeter or building up the floor, which changes headroom and cost. An allowance that isn’t on paper is a surprise waiting for a date, so we write every option down. Call (877) 610-1318 to talk through your garage.
Probably not for water damage tied to drainage. If the original builder-grade drainage grades have settled toward the foundation, your insurer will likely classify resulting water intrusion as a maintenance failure, not a covered loss. That’s why we regrade the perimeter and correct drainage before adding on. In Forest Oaks we recently found grades settled toward the slab, causing perimeter heaving; after regrading, rerouting downspouts, and a GPR scan before the plumbing cut, the inspector signed off just as the November rains began. The addition has stayed level through two wet-dry cycles. Call (877) 610-1318 to get your drainage assessed as part of the estimate.
The draw schedule in Cedar Park has to account for soil movement windows. Footings poured during dry July conditions behave differently once November rains rehydrate the clay, so we schedule inspections and draw requests around the work actually completed, not the season. Our written change orders document every scope adjustment, so your lender sees a clean trail. Call (877) 610-1318 and we’ll walk you through how we schedule a Cedar Park ADU build from footing to final.
Planning an addition or ADU in Cedar Park means hiring someone who understands post-tension slabs, Vertisol clay, and 110-mph wind ratings. We also handle Windows & Doors - Cedar Park as part of our full-service builds. Tom Barrett and his sons have been running crews since 1998. We publish our name, our license number, and our address. Every job gets permits, inspections, written change orders, and the 90-Day Done Right Promise. Call (877) 610-1318 for your free estimate, and we’ll give you the numbers before anyone picks up a tool.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Cedar Park since 1998.