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 Cedar Park
A legal, insurable accessory dwelling unit or room addition in Cedar Park, TX typically runs $45,000-$130,000 depending on scope, and the permitting, slab scanning, and wind-load work that keeps it compliant usually adds three to six weeks to the timeline. We know that because we’ve framed, permitted, and finished additions from Buttercup Creek to Forest Oaks, and we’ve seen what the boom-era slabs and settled drainage do to a job when a contractor skips steps. If you’re planning an ADU or addition in the 78613 or 78630 ZIP codes, call (877) 610-1318 and we’ll walk the property with you before anyone touches a saw. Our Home Additions & ADU crew lives and works in this market, and we’re familiar with Cedar Park’s clay, its wind-load requirements, and its permitting quirks.
Why Barrett & Sons Construction Is Cedar Park’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998, and his sons run the crews that show up in Cedar Park. That’s not a tagline; it’s the operating structure. When you call, a live person answers. When Tom gives you a number, it’s in writing. When a price changes, the change order arrives before work does. Those things matter in Cedar Park, where people have been burned by national outfits that quote one price on the phone and hand over a different bill at the door.
We’re known in Cedar Park for pulling permits on every eligible job and getting inspections signed, not waved off. We’ve had homeowners in the Buttercup Creek and Forest Oaks neighborhoods tell us the last contractor said permits were optional. The permit inspector works for you, not for me, and we’d rather have him on the job than not. Our crew members are background-checked and carry the Barrett & Sons name on their shirts. We answer our own phone, 24/7, and if something’s not right after the job’s done, our 90-Day Done Right Promise means one call brings Tom back. You can look up his name, address, and license number before you sign anything. Ask anyone on your street, or look up the license number yourself.
Our Home Additions & ADU Services in Cedar Park
ADU Design & Permitting
Before a single footing goes in, the ADU has to clear Cedar Park’s zoning, setback, and height envelope, then survive structural review for wind-load and slab conditions. We handle that end to end. In Cedar Park, that means the design package has to reconcile what the lot will actually allow with what the insurance carrier will actually cover, and we’ve learned to front-load that conversation so a homeowner doesn’t pay for a design that can’t get a permit.
Garage Conversion ADU
Garage conversions are the most common ADU path in Cedar Park’s 1990s and early-2000s subdivisions, because the garage shell already exists. The catch is what’s underneath and around it. We recently permitted and framed a garage conversion ADU on a slab home in the Buttercup Creek subdivision. Our crew had to GPR-scan the post-tension slab before cutting for the ADU’s plumbing rough-in; then we regraded the settled perimeter swale and installed moisture-wrapped sill plates rated for the wind-load uplift on that elevation before any dry-in inspection. That’s what a compliant Cedar Park garage conversion actually looks like on the inside of the quote.
New Detached ADU
A detached ADU in the 78613 corridor gives you clean separation, but it also means the foundation is being poured on Cedar Park’s shrink-swell Vertisol clay, usually over shallow limestone. That soil moves through Cedar Park’s drought-to-downpour cycles in a way that will crack a cheap slab at the seams. We design the foundation and drainage as one system: the slab, the perimeter swale, and the downspout routing get engineered together, not bolted on as separate line items.
Junior ADU & Interior Conversion
A junior ADU or interior conversion puts the unit inside the existing envelope, which avoids some site and setback work but introduces slab cuts for plumbing rough-ins. In a Forest Oaks or Buttercup Creek post-tension slab, cutting without GPR scanning can strike an embedded cable, void the original structural warranty, and stop the job for re-engineering. We scan every cut, every time, and we put that in the scope in writing.
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 Cedar Park
We install windows, exterior doors, and fenestration on the ADU envelope that actually meet the wind-load ratings Cedar Park requires, using brands like Simonton, PGT, and Ply Gem. We’re not married to one manufacturer; we spec what the elevation demands and what the code table says. For Cedar Park homeowners, we keep lead times honest. Supply chains for impact-rated and high-wind products have been uneven, and we’d rather tell you a window is eight weeks out than promise four and frame the opening around nothing.
Key Takeaways for Cedar Park Homeowners
- A legal ADU or addition in Cedar Park runs $45,000-$130,000, with detached ADUs higher due to foundation and utility work.
- Cutting into a post-tension slab without GPR scanning is the single most common expensive mistake we see in boom-era subdivisions.
- Settled drainage in 78613-era subdivisions means the perimeter often needs regrading before interior work can be warranted.
- Cedar Park’s wind-load requirements mean standard anchor bolts and tie-downs rated for inland zones can leave your ADU uninsurable.
- Every eligible job gets permits pulled, inspections signed, and a written 90-Day Done Right Promise.
Common Home Additions & ADU Problems We See in Cedar Park Homes
- Skipped GPR scanning before slab cuts. Post-tension cables run through the slab under thousands of pounds of tension. A saw strike can void the structural warranty and halt the job while an engineer re-draws the plans.
- The foundation was poured before the settled clay was regraded. If the addition’s slab goes in while the existing perimeter drains toward the house, the new section moves independently and cracks at the seam after the next wet-dry cycle.
- Wind-load ratings ignored on roof tie-downs and anchor bolts. Cedar Park sits in a severe hail and wind corridor. Hardware rated for inland zones can leave the structure uninsurable after the next wind-driven hail event.
- Drainage grades set to builder minimum spec in the early 2000s. We routinely find downspouts discharging at the foundation and swales that now fall toward the slab instead of away from it. Interior remodel work often waits until the water stops running the wrong way.
Pricing for Home Additions & ADU in Cedar Park, TX
Here’s what we quote in Cedar Park today, and the ranges reflect what the scope actually includes, not a teaser to get a signature.
| Project Type | Cedar Park Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
A garage conversion on a slab in Buttercup Creek lands at the lower end because the shell exists, but the slab scan, plumbing rough-in, and electrical upgrade pull it up from there. A detached ADU in the 78613 corridor runs higher because the foundation, utilities, and wind-rated envelope are all new. What a cheap quote leaves out in Cedar Park usually adds up to the same number in change orders later: the GPR scan, the regrade, the wind-load hardware, the permit fees. Our quotes carry those line items on day one. Every scope, every allowance, every price change arrives as a written change order before work happens. Call (877) 610-1318 for a free estimate, and we’ll put it in writing.
We Also Serve Cities Near Cedar Park
Beyond Cedar Park, our crews take on ADU and addition work in Brushy Creek, Anderson Mill, Jollyville, and Leander. The soil, the wind-load requirements, and the subdivision-era drainage problems don’t stop at the city line, and neither do we. If you’re in a neighboring community and planning an ADU or room addition, the same crew that works in Cedar Park will handle the 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. A garage conversion ADU in Cedar Park requires final inspections signed off on electrical, plumbing, mechanical, and structural work before the unit can be legally occupied or rented. We pull permits before the work starts and schedule every inspection, and the sign-off paperwork becomes part of your closing package. Call (877) 610-1318 and we’ll walk you through the sequence for your specific subdivision.
Your detached ADU in the 78613 ZIP code must be designed and anchored to the wind-load rating Cedar Park’s current code specifies for your exposure category, which typically exceeds the inland default on open-lot and corner-lot elevations. We spec anchor bolts, sill plates, and roof tie-downs to the site’s actual uplift numbers, not the inland baseline. Call (877) 610-1318 and we’ll quote the hardware that matches your elevation.
No. Cutting into a post-tension slab in a Forest Oaks home without first locating the embedded steel cables via GPR scanning risks striking a cable under tension, which can void the original structural warranty and trigger a full engineering re-evaluation. We scan every cut location before sawing. Call (877) 610-1318 for an estimate that includes the scan as a written line item.
Because in Cedar Park’s 78613 subdivisions built during the early-2000s boom, drainage grades were set to builder minimum spec and have since settled toward the foundation rather than away from it. If the new section’s slab goes in while the existing perimeter drains wrong, the two sections move independently during the next drought-to-rain cycle and crack at the seam. The regrade isn’t an upsell; it’s what makes the warranty hold. Call (877) 610-1318 for a quote that breaks out the regrade in writing.
A compliant Cedar Park ADU quote should include a GPR scan of any post-tension slab cuts, anchor bolts and roof tie-downs rated for the site’s wind-load uplift, drainage regrading if the existing swale falls toward the foundation, and permit fees. Products from Simonton, PGT, or Ply Gem show up on the fenestration line for wind-rated openings. Cheap quotes omit the scan, use inland hardware, and call the regrade a change order later. Call (877) 610-1318 for a free estimate, and we’ll show you the difference in writing.
Ready to Talk About Your Cedar Park ADU or Addition?
We’re not going to quote you a number over the phone and hand you a different bill at the door. Tom Barrett will walk the site, look at the slab, the drainage, and the wind exposure, and put the scope in writing. Every permit pulled, every inspection signed, every price change on paper before work begins. Call (877) 610-1318 to schedule your free estimate. Tom’s name, his address, and his license number are published and verifiable, and he lives twenty minutes away; if something’s wrong, he wants to know about it.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Cedar Park and the surrounding communities.