A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Granada Hills, CA
Benson ADU Builders handles ADU construction, home additions, and room additions across Granada Hills, CA. This page covers what makes Granada Hills projects distinct: the housing stock, the terrain, the permitting realities, and what homeowners should budget before they call. If you want a written price before any work starts – not a verbal ballpark that shifts later – call (903) 568-7222. Each of our three services has its own Granada Hills page linked below, with deeper pricing and project details.
Why Granada Hills Homes Are Different
Granada Hills sits in the northern San Fernando Valley, where summers run hot and dry and the terrain rolls from flat lots up into the foothills below the Santa Susana Pass. That combination shapes every ADU and addition we quote here. Homes built in the 1950s and 1960s dominate much of Granada Hills – ranch layouts, pier-and-post or slab foundations, and increasingly aging sewer lines that connect to the city main. On hillside lots south of Rinaldi and along the Balboa Highlands, we regularly deal with slope setbacks, retaining wall reviews, and LADBS hillside grading requirements that flat-lot ADUs never trigger. The Balboa Highlands area includes Eichler-style homes, which means working around post-and-beam framing and tongue-and-groove ceilings when tying in a new addition. Granada Hills also sits in a Very High Fire Hazard Severity Zone along its northern edge, so any ADU or addition with habitable space near wildland areas carries additional fire-resistant cladding and eave requirements on the plans. None of this makes a project unreasonable – it just means the quote has to account for it from day one, which is exactly how we write ours.
Our Main Granada Hills Services
Most Granada Hills homeowners call us about one of three things: adding a standalone ADU in the backyard, opening up the main house with a large addition, or converting an existing den or bonus room into usable square footage. Each service has its own page with full pricing detail and FAQs.
ADU Builders in Granada Hills
A backyard ADU in Granada Hills is usually a detached unit between 400 and 1,000 square feet, either site-built or delivered as a prefab panel system from brands like Abodu, Cover, or Boxabl. On flat R1 lots south of Rinaldi, a standard ADU can often proceed under state ADU mandates without a discretionary hearing. Hillside lots add grading, retaining walls, and foundation pier depth to the plan. We walk every Granada Hills ADU through the same sequence: site measure, plan set, written price, permit submittal, build. Read the full breakdown on our ADU Builders in Granada Hills page.
Home Addition Contractor in Granada Hills
A home addition in Granada Hills means attaching new conditioned square footage to an existing single-story ranch, which is the dominant style here. Most additions we quote involve foundation tie-in work, roof pitch matching, and re-routing HVAC runs – and on older Granada Hills homes, upgrading the existing electrical panel to support the added load. Slab foundations east of Balboa tend to be straightforward; hillside pier-and-post foundations take more structural review. Every addition quote includes a written price before work starts. Details are on the Home Addition Contractor in Granada Hills page.
Room Addition Contractor in Granada Hills
A room addition in Granada Hills often converts a covered patio into a permitted bedroom or extends a living room out toward the backyard. These are smaller in scope than whole-home additions, but they still require plans, permits, and a foundation inspection – especially on Granada Hills lots where the existing patio slab was never engineered for habitable weight. We also see a lot of garage-adjacent room additions here, where homeowners capture the space between the garage and the main house. Get the full picture on the Room Addition Contractor in Granada Hills page.
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 Granada Hills
Benson ADU Builders is authorized to build with Abodu, Cover, Dvele, and Mighty Buildings – four of the leading prefab ADU brands in California. For Granada Hills homeowners, that means you can compare a panelized Dvele unit against a steel-framed Boxabl or a site-built design and decide based on real numbers, not one contractor’s take-it-or-leave-it option. See our brands for the full lineup.
Pricing for ADU Company in Granada Hills, CA
| Service | Typical range in Granada Hills |
|---|---|
| Detached ADU, one bed / one bath (site-built) | $180,000 – $260,000 |
| Detached ADU, prefab panel system (Abodu, Cover, Boxabl) | $150,000 – $230,000 |
| Garage conversion ADU | $110,000 – $170,000 |
| JADU (attached junior ADU) | $90,000 – $140,000 |
| Detached ADU, two bed / one bath | $230,000 – $320,000 |
| Home addition, single room (200 – 350 sq ft) | $80,000 – $140,000 |
| Home addition, primary suite | $140,000 – $220,000 |
| Home addition, full second story over existing footprint | $280,000 – $420,000 |
| Room addition, garage-adjacent capture | $100,000 – $165,000 |
| Site prep, grading, and retaining wall (hillside lots) | $25,000 – $70,000 |
What pushes a Granada Hills ADU or addition toward the top of these ranges: hillside grading, retaining walls, fire-zone cladding, sewer line replacement, and panel upgrades on older ranches. Flat-lot projects with standard slab foundations land near the bottom. Whatever your lot looks like, you get a written price before any work starts – no change orders billed after the fact.
Neighborhoods We Serve in Granada Hills
We work across Granada Hills and quote every project the same way: written price first, background-checked crew in uniform on site, and a live person on the phone any time you call. Our scheduling moves from flat-lot neighborhoods down into the foothill streets without a change in process or pricing.
- Balboa Highlands
- Knollwood
- North Granada Hills
- Granada Hills North (near Rinaldi)
- Zelzah Corridor
Service Area – Cities Near Granada Hills
While this page covers Granada Hills specifically, our crews also serve the surrounding northwest Valley. If you’re in San Fernando, CA, Northridge, CA, Porter Ranch, CA, or Chatsworth, CA, call (903) 568-7222 and we’ll route you to the right page and the same written-price process.
Serving Granada Hills, CA - Our Local Coverage Area
We’re based in the Granada Hills 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 Granada Hills
After your initial call, we schedule a site measure and deliver a written price with a plan set in hand. Granada Hills plan checks with LADBS typically run six to ten weeks for a standard ADU, and hillside projects add review time. Call (903) 568-7222 and we’ll walk you through the exact sequence for your lot.
Some Granada Hills neighborhoods, including parts of the Balboa Highlands area, have active homeowner associations with design review committees. State ADU law limits what an HOA can block, but architectural standards still apply. We review your specific HOA’s covenants before any price is finalized.
Yes. Every ADU and addition we build in Granada Hills goes through LADBS permitting, and we pull the permits, schedule the inspections, and stay on site through the final sign-off. A written price and a written guarantee cover the whole project from plan set to passed inspection.
Ready to see a real price for your Granada Hills ADU or addition? Call Benson ADU Builders at (903) 568-7222 and ask for a free, written estimate. Troy Eastman leads our team, and every quote comes with a 365-Day Done Right Promise in writing before a single shovel turns.
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 Granada Hills 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.
