ADU Builders in Granada Hills - Plans, Permits & Build, One Fixed Price

Fast, Reliable ADU Builders Across Granada Hills

Granada Hills homeowners looking to add an accessory dwelling unit typically deal with one big unknown: what happens when we open up a 1958 ranch home and find wiring that predates color television. The short answer is that a custom ADU in Granada Hills runs roughly $180,000 to $350,000, a prefab ADU lands between $120,000 and $240,000 depending on brand and site work, and a junior ADU conversion usually falls between $80,000 and $150,000. We’re Benson ADU Santa Clarita, led by Troy Eastman, and we coordinate scheduling and dispatch from our Los Angeles office with crews serving Granada Hills locally. Call (661) 219-7906 and we’ll walk the lot with you before you spend a dollar.

Call (661) 219-7906

Key Takeaways

• Granada Hills ADUs typically cost $120,000 – $350,000 depending on type, size, and what the site requires.
• 1950s-era ranch homes here often need electrical panel upgrades before an ADU can be permitted.
• Sloping Knollwood lots can enable two-story ADUs with garage below, a design you won’t find in flat parts of the Valley.
• We put every price in writing before work starts, and our 365-Day Done Right Promise covers the work for a full year.

Why Benson ADU Santa Clarita Is Granada Hills’s Preferred ADU Builders Company

Our reputation in Granada Hills comes from doing the unglamorous work well: pulling the permit, getting the inspection passed, and telling you the real price before the first wall comes down. Granada Hills homeowners have told us they chose Benson because we’re the only ADU Builders team they talked to who explained what a setback variance actually costs. Before you ask: a setback is the required distance between a structure and your property line. Some Granada Hills lots need a variance because the rear slope eats into that required space, and we handle the paperwork as part of the build.

What builds trust faster than a written price is that we honor it. The 365-Day Done Right Promise is stamped on every project we do in Granada Hills. If something isn’t right within a full year, we make it right. No arbitration first, no phone tag. Our technicians are background-checked and arrive in uniform, and a live person answers the phone around the clock, every day. That matters when you’re trying to schedule around a Santa Ana wind day.

ADU Contractor in Granada Hills

As an ADU Contractor and Room Addition Contractor in Granada Hills, our job is to take the approved plan and turn it into a finished unit without turning your budget into a moving target. A full ADU build in Granada Hills runs $180,000 to $350,000 for a site-built detached unit in the 500 to 800 square foot range. That includes foundation, framing, roofing, stucco or James Hardie cladding, electrical, plumbing, drywall, flooring, and a full kitchen and bath. Prefab options from Dvele, Mighty Buildings, or Plant Prefab can trim site time significantly, landing between $120,000 and $240,000 including site work.

Site-Built vs. Prefab in Granada Hills

Site-built makes sense on Granada Hills lots where the slope demands a custom foundation or a two-story layout with a garage below. Prefab is faster and cleaner on flat lots with straightforward access for a crane or panel delivery. We build with both methods, and we’ll show you a written line-item comparison before you commit to either path.

What We Actually Do On-Site

Our crews handle excavation, foundation forming and pouring, framing, roof installation, window and door setting, mechanical rough-in, drywall, finish carpentry, paint, and final fixtures. We coordinate the inspections. We handle the corrections. When the unit is done, you get a digital invoice payable by link and before-and-after photos of every phase. Troy Eastman personally reviews every Granada Hills change order before it reaches you.

Trusted Brands We Service in Granada Hills

We’re authorized to build with prefab brands homeowners can research independently: Boxabl for compact, factory-built units with fast site assembly, Dvele for high-performance homes with integrated smart systems, and Mighty Buildings for panelized construction that cuts weeks off a Granada Hills build. For cladding, we use James Hardie fiber cement siding, which holds up against Santa Ana wind and the hot, dry Granada Hills summer. Because we maintain local parts inventory and direct relationships with these brands, a replacement panel or a warranty part doesn’t sit in a freight queue for three weeks. That’s a real advantage when an inspection correction has a deadline.

Common ADU Builders Problems We See in Granada Hills Homes

Older Granada Hills housing stock has predictable failure points. Here’s what we consistently find once the walls are open:

• Cloth-wrapped aluminum wiring from the 1950s and 60s. Tying a new ADU into this wiring is a code violation and a fire hazard. The fix is a service upgrade and circuit replacement, which we scope during the initial inspection, not after demo.
• Water-damaged sole plates from failed stucco flashing. Granada Hills homes with original stucco often have moisture intrusion at the base of exterior walls. If the sole plate is rotted, it must be sistered or replaced before new framing ties in. We write this into the contract allowance.
• Undersized framing in 1950s ranch additions. Original walls and roof structures were built to older codes with smaller lumber. A new ADU with modern roof loads needs proper structural connection, and we plan for the reinforcement required.
• Insufficient rear-yard drainage on sloping Knollwood lots. A sloped lot collects water at the rear of the property. If drainage isn’t accounted for, the new ADU’s foundation sits in damp soil. We address grading and drainage in the plan phase so the foundation stays dry year-round.

Pricing for ADU Builders in Granada Hills, CA

The Knollwood Slope Advantage

In Granada Hills’ Knollwood area, many lots gently slope toward the street. Local ADU builders have learned to use that slope for a design you rarely see in flatter parts of the San Fernando Valley: a two-story ADU at the rear of the property with a garage below and living space above. It’s a configuration that preserves the front yard, adds covered parking, and creates privacy from Chatsworth Street traffic. On a 1958 ranch on Chatsworth Street in the Knollwood district, our crew opened the wall to tie in a new ADU and found cloth-wrapped aluminum wiring and a water-damaged sole plate from failed stucco flashing. We stopped work, wrote up a change order for a new 200-amp panel and sistered framing, and had the owner approve the revised cost in writing before we touched another stud. The ADU went up with a rear two-story layout over a new garage, using the lot’s natural slope to keep the front yard intact.

What happens on those older Granada Hills lots, and the code upgrades a permit triggers once walls are open, is the single biggest reason a remodel quote moves. Most builders hand you a bill when they find it. We handle it differently: inspection first, allowances written into the contract, and any surprise priced and approved in writing before we touch it.

We also serve Granada Hills homeowners through every phase, from first sketch to final inspection. This page is about the Granada Hills process specifically, because the homes here are not the same as the homes five miles south.

We Also Serve Cities Near Granada Hills

Our crews regularly work in Mission Hills, San Fernando, Northridge, and Sylmar. If you’re in one of those areas and want the ADU Builders team that writes the price down before work starts, give us a call. The same written guarantee applies.

FAQs About ADU Builders in Granada Hills