ADU in North Hollywood, CA
A Junior ADU or interior conversion in North Hollywood typically runs $85,000-$165,000 all-in, while site prep and utility work for any ADU type adds $25,000-$75,000 depending on what the 1950s-era infrastructure needs. We’re Ellery ADU Studio, and we’ve designed, permitted, and built over 900 ADUs since 2015. Our Los Angeles office coordinates crews across North Hollywood daily. Call (424) 523-8492 for a free estimate with a written price before any work starts.
Why North Hollywood Homes Are Different
North Hollywood’s housing stock was built fast and cheap in the post-WWII boom, mostly single-story stucco ranch homes on 6,000-7,500 sq ft lots from the late 1940s through the mid-1960s. The original 60-100 amp electrical panels and aging galvanized supply lines were fine for a single family with one window unit; they’re not fine for a permitted ADU with a kitchen, laundry, and dedicated HVAC.
The San Fernando Valley heat is the other variable. North Hollywood sees 105°F+ days every summer, running 10-15°F hotter than the Westside with no marine layer relief. A converted garage or interior space without proper insulation and a mini-split becomes unrentable fast. We spec R-13 minimum wall insulation and correctly sized HVAC on every permit set, not as an upgrade.
The alley grid matters too. Many lots have rear alley access laid out in the 1950s, which lets a detached garage ADU get its own address and utility point. That simplifies separate metering and gives real privacy from the main house, a layout advantage rare on Westside lots where garages abut the home.
Our Main North Hollywood Services
North Hollywood homeowners call us most often for ADU Design & Permitting in North Hollywood, Garage Conversion ADU in North Hollywood, and New Detached ADU in North Hollywood. Here’s what each involves on local ground.
ADU Design & Permitting in North Hollywood
We produce the full permit set, structural calcs, and Title 24 energy compliance for LADBS submittal. North Hollywood’s Transit Priority Area status waives replacement parking on garage conversions, a $20,000-$40,000 savings we document in every permit set. The drawings, not the build, are the core product.
Garage Conversion ADU in North Hollywood
Most North Hollywood garages are detached, single-story, and alley-accessed, the ideal conversion footprint. We assess slab thickness, roof structure, and whether the existing electrical panel can handle the additional load. If not, the panel upgrade goes into the same written quote.
New Detached ADU in North Hollywood
New construction on a North Hollywood lot means navigating setback rules, the 16-foot height limit, and utility trenching from the main house. We handle the full design-build contract, including prefab coordination with brands like Abodu or Cover when that fits the lot.
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.
Before
AfterJunior ADU & Interior Conversion in North Hollywood
North Hollywood’s 1950s ranch homes are built for conversion. The typical 1,200-1,400 sq ft main house has a basement, attached garage, or underused bedroom that can become a Junior ADU without expanding the footprint. Interior JADUs and room conversions are especially viable here because the original floor plans are simple and the lots are wide enough to meet side-yard setbacks for attached additions. We handle the full Junior ADU & Interior Conversion design-build contract, from measured drawings through final inspection, at one written price.
Interior JADU
Signs you need it
You have a 300-500 sq ft spare bedroom, basement, or converted porch with separate exterior access and want rental income without new construction.
What it costs in North Hollywood
Interior JADU conversions in North Hollywood typically run $85,000-$140,000 all-in, including the kitchenette, bathroom rough-in, electrical subpanel, and permit set.
How we do it
We measure existing conditions, produce the LADBS permit set with fire separation details, rough in wet walls, install the kitchenette and bath, and pass final inspection with a documented photo record at each visit.
Room-to-ADU Conversion
Signs you need it
You have two adjacent underused rooms, a separate side entrance, and want a self-contained unit without touching the home’s exterior envelope.
What it costs in North Hollywood
Room-to-ADU conversions in North Hollywood typically run $95,000-$165,000 depending on whether the existing slab needs trenching for new plumbing and if the electrical panel requires upgrade.
How we do it
We verify the existing slab depth, design the wet-wall layout for minimal trenching, pull the LADBS permit, build to the approved drawings, and deliver the documented photo record at completion.
What Junior ADU & Interior Conversion Costs in North Hollywood
| Item | Typical range in North Hollywood |
|---|---|
| Interior JADU (kitchenette + bath, no exterior work) | $85,000 - $140,000 |
| Room-to-ADU conversion (plumbing + electrical) | $95,000 - $165,000 |
| Electrical panel upgrade (if needed) | $4,500 - $8,500 |
Can a Junior ADU share a bathroom with the main house?
No. LADBS requires a fully separate bathroom with its own door to the JADU’s living space, not a shared hallway bath. We design this into the permit set from day one so the plan check doesn’t bounce. Call (424) 523-8492 and we’ll walk through your floor plan.
Do I need a separate meter for a Junior ADU in North Hollywood?
No, a JADU can share the main house meter under LADBS rules, though many homeowners opt for a submeter to split utility costs with tenants. We spec the electrical layout for either approach in the permit set.
ADU Site Prep & Utilities in North Hollywood
North Hollywood’s 1950s infrastructure is the hidden cost in every ADU project. Original 60-100 amp panels, galvanized water lines, and shallow sewer laterals weren’t built for an additional dwelling. The Valley heat makes proper electrical sizing non-negotiable, a mini-split on a 60-amp service will trip breakers daily. We handle ADU Site Prep & Utilities as a standalone scope or bundled into the full design-build contract, always with a written price before breaking ground.
Electrical Panel Upgrade
Signs you need it
Your main panel is 60-100 amps, has no open breaker spaces, or still uses fuses instead of breakers.
What it costs in North Hollywood
Electrical panel upgrades in North Hollywood typically run $4,500-$8,500 for a 200-amp service with trenching to the new meter location.
How we do it
LADW verifies service capacity, we pull the LADBS electrical permit, install the new panel and grounding system, and coordinate LADW meter release before rough inspection.
Plumbing Lateral
Signs you need it
Your home has galvanized supply lines, a sewer lateral with known root intrusion, or the ADU location is more than 50 feet from the main house wet wall.
What it costs in North Hollywood
Plumbing lateral work in North Hollywood typically runs $8,500-$18,000 for trenching, new copper or PEX supply, and ABS sewer to the city main.
How we do it
We camera the existing line, produce the LADBS plumbing plan, trench with proper slope and bedding, pressure-test before backfill, and pass inspection with photo documentation.
What ADU Site Prep & Utilities Costs in North Hollywood
| Item | Typical range in North Hollywood |
|---|---|
| Electrical panel upgrade to 200 amps | $4,500 - $8,500 |
| Plumbing lateral (supply + sewer) | $8,500 - $18,000 |
| Foundation and grading (new detached ADU) | $12,000 - $28,000 |
Will LADW require a new service drop for my ADU?
Usually not for a JADU or garage conversion on a 200-amp panel, but a new detached ADU with full electric appliances may trigger a service upgrade request. We coordinate the LADW load letter as part of the permit set so there are no surprises at meter release. Call (424) 523-8492 for a free estimate.
How deep do sewer laterals need to be in North Hollywood?
LADBS requires 18 inches minimum cover for sewer lines in North Hollywood, deeper under driveways. Many 1950s laterals are shallow and unbedded; we replace them to current standard with proper slope and compacted backfill.
Brands We Service in North Hollywood
We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, and Mighty Buildings within the same single contract, handling factory liaison, site prep, crane scheduling, and final utility hookup. Most prefab units arrive within 8-12 weeks of permit approval. See our brands for full specifications.
Pricing for ADU in North Hollywood, CA
| Service | Typical range in North Hollywood |
|---|---|
| Interior JADU conversion | $85,000 - $140,000 |
| Room-to-ADU conversion | $95,000 - $165,000 |
| Electrical panel upgrade | $4,500 - $8,500 |
| Plumbing lateral (supply + sewer) | $8,500 - $18,000 |
| Foundation and grading (new detached) | $12,000 - $28,000 |
| Garage conversion ADU (all-in) | $120,000 - $220,000 |
| New detached ADU (all-in) | $250,000 - $450,000 |
| Above-garage ADU | $150,000 - $280,000 |
What pushes price up in North Hollywood: slab replacement on a garage with no footing, hillside grading on Valley Village-adjacent lots, and electrical service upgrades when LADW requires a new transformer. What doesn’t change the price: our written quote is locked at signing per Haven Standard Clause 1, no change orders, no door-side upsells.
Neighborhoods We Serve in North Hollywood
Our crews work across the full North Hollywood area, from the Metro B Line corridor to the Valley Glen border. Typical response for a site visit is same-week scheduling, with permit-ready drawings delivered in 6-10 weeks depending on LADBS plan check volume.
- Valley Village
- NoHo Arts District
- Laurel Canyon
- Valley Glen
- Toluca Woods
Service Area - Cities Near North Hollywood
We serve homeowners throughout the central San Fernando Valley and adjacent communities. Our crews are regularly on-site in Studio City, CA, Van Nuys, CA, Burbank, CA, and Glendale, CA, with the same design-build contract and written pricing structure.
Serving North Hollywood, CA - Our Local Coverage Area
We’re based in the North Hollywood 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 in North Hollywood
Standard plan check for an ADU in North Hollywood runs 8-12 weeks through LADBS, or 4-6 weeks if you pay for expedited review. We submit a complete permit set with structural calcs and Title 24 compliance to avoid the common rejection loop that adds months.
Most North Hollywood neighborhoods were built before HOAs became common, but a few newer pockets and condo-adjacent areas do have covenants. We review your preliminary title report during the design phase and flag any CC&R language that could block the project before you invest in full drawings.
Yes, but corner lots have additional setback and visibility triangle rules that affect garage placement and driveway access. We measure the exact corner cutoffs and design the footprint to clear them on the first permit submittal.
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 North Hollywood Customers Say
"The rental income has covered the payment since the second month. They were realistic about the numbers rather than optimistic."
- Odette N."They walked us through setbacks and utility capacity before we paid anything, and told us one of our two options was not going to get approved."
- Mireille T."The permit set and the build were one contract with one number. Our neighbours used two firms and spent a year watching them blame each other."
- Helena V.