A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Tarzana, CA
Tarzana homeowners call us most often for ADUs, home additions, and room additions, and the honest first answer is that pricing here runs higher than the Valley average because of lot sizes, soils, and the age of the housing stock. A detached ADU in Tarzana typically lands between $180,000 and $320,000, while a room addition usually falls between $90,000 and $180,000. If you’re weighing an ADU against an addition, or just want a real number before you commit, call (903) 568-7222 and we’ll put one in writing.
Why Tarzana Homes Are Different
Tarzana wasn’t built all at once. Drive south of Ventura Boulevard and you’ll pass ranch homes from the 1950s and 1960s with low-pitch roofs and pier-and-beam foundations. Head up into the hills toward Mulholland and you hit newer construction on slopes that need retaining walls and stepped footings. That mix changes the work. A flat-lot ADU on a rectangular parcel is a different project from a hillside addition where every yard of concrete has to be pumped instead of poured.
Soils matter here too. Much of Tarzana sits on expansive clay that swells when it rains and shrinks in the summer heat. Digging a foundation without accounting for that movement is how you get cracks in year three. We size footings and slab reinforcement for soil movement from the start because we know the ground on this side of the 101. Permits go through Los Angeles Department of Building and Safety, and Tarzana’s hillside overlay adds an extra layer of review on the south side of the neighborhood, so we build that timeline into the plan from day one rather than discovering it mid-project.
Our Main Tarzana Services
Tarzana homeowners tend to come to us with one of three projects: a detached ADU in the backyard, a full home addition off an existing wall, or a single-room bump-out. Each one has its own page with pricing, timelines, and the Tarzana-specific details below.
ADU Builders in Tarzana
Tarzana’s R-1 lots were platted generously by Valley standards, and many backyards have the 20 to 30 feet of depth an ADU needs without touching the main house’s setbacks. We build both detached units and garage conversions, and we can go prefab with brands like Abodu or Dvele when the lot access is tight, or site-built when the yard has room for a crew. The biggest variable in Tarzana is the foundation: flat lots behave predictably, but hillside parcels behind Mulholland Drive often need pier drilling and retaining work before framing starts. ADU Builders in Tarzana has the full breakdown.
Home Addition Contractor in Tarzana
A home addition in Tarzana means extending the existing footprint, and that puts the age of the original structure front and center. Homes built in the 1960s don’t always have the sheer-wall capacity current code requires, so we often add plywood bracing or a steel moment frame where the new roofline ties into the old one. Matching the roof pitch is another thing we do carefully on these older ranch styles because a visible seam in the shingles is the first thing a future buyer notices. Home Addition Contractor in Tarzana covers costs and scope.
Room Addition Contractor in Tarzana
Single-room additions in Tarzana usually mean a primary bedroom suite off the back, a family room extension, or an office with its own entrance. These are the fastest projects we do in the area, often six to ten weeks from permit-ready drawings to final inspection, depending on whether the lot is flat. A single room on a hillside lot can still trigger grading review, so we check the parcel’s hillside designation before we quote. Room Addition Contractor in Tarzana has specifics.
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.
Brands We Service in Tarzana
We build with Abodu, Cover, Dvele, and Mighty Buildings, and we keep their current panel and material specs on hand so we can quote a prefab Tarzana ADU accurately without a three-week back-and-forth. See our brands for the full list and what each one does well.
Pricing for ADU Company in Tarzana, CA
| Service | Typical range in Tarzana |
|---|---|
| Detached ADU (site-built) | $200,000 – $320,000 |
| Detached ADU (prefab, e.g. Abodu or Dvele) | $180,000 – $280,000 |
| Garage conversion ADU | $130,000 – $200,000 |
| JADU (attached junior ADU) | $95,000 – $150,000 |
| Primary suite addition | $120,000 – $200,000 |
| Family room or great-room addition | $140,000 – $220,000 |
| Second-story addition | $250,000 – $400,000 |
| Single-room addition | $90,000 – $180,000 |
| Home office or studio addition | $80,000 – $150,000 |
Hillside lots south of Ventura push the top of those ranges because of foundation drilling, retaining walls, and the extra engineering the city requires. On flatter parcels north of the 101, prices track closer to the middle of each band. Every quote is a written price before work starts, so the number you see is the number you pay.
Neighborhoods We Serve in Tarzana
We work throughout Tarzana, from the flat streets around Vanalden and Reseda Boulevard up into the hillside pockets south of Mulholland. Typical response for an estimate visit anywhere in Tarzana is within a few business days, and we schedule around your availability.
- Tarzana Hills (south of Mulholland)
- Flat lots around Vanalden Avenue
- Tampa Avenue corridor
- Neighborhoods between Reseda and Wilbur
- West Tarzana near Corbin Avenue
Service Area – Cities Near Tarzana
Our crews also cover the neighborhoods just over the Tarzana line. If your property is in Encino, CA, Reseda, CA, Woodland Hills, CA, or Canoga Park, CA, the same written-price promise applies, and we’ll still schedule the same way.
Serving Tarzana, CA - Our Local Coverage Area
We’re based in the Tarzana 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 About ADU Company in Tarzana
We typically get to Tarzana within two to four business days for an initial walkthrough and measure. It’s not a sales call; we look at the lot, talk through what’s realistic, and write a number down. Call (903) 568-7222 to set it up.
Most Tarzana homes aren’t in an HOA, but some hillside communities and newer developments do have one. If yours does, we review the CC&Rs before we draw anything and confirm what the board will actually sign off on. That avoids redesigns later.
Yes. Hillside lots need grading plans, retaining walls, and sometimes pier foundations, and we handle that scope directly rather than subbing it out and hoping. The quote reflects the engineering up front, not as a change order later. Call (903) 568-7222 for a written estimate on your specific parcel.
If you’re still weighing an ADU against an addition, or you just want a number you can actually plan around, call (903) 568-7222. We’ll schedule a walkthrough, write the price down, and send it to you. No pressure, no vague verbal ranges.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Tarzana Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
