ADU in North Hollywood, CA
Junior ADU & Interior Conversion in North Hollywood typically runs $85,000-$145,000 all-in, drawings through final inspection, while ADU Site Prep & Utilities starts around $15,000-$35,000 before the structure goes up. We’re Ellery ADU Studio, a design-build practice led by Nadia Ellery, and we’ve found North Hollywood’s 1950s-60s ranch stock with alley-accessed garages creates a nearly unique conversion opportunity in the east Valley. Call (626) 427-9813 and we’ll put a written price in your hand before any work starts, per Haven Standard Clause 1.
Why North Hollywood Homes Are Different
North Hollywood sits at the terminus of Metro’s B Line and G Line, the only San Fernando Valley neighborhood with this level of direct rail access to Hollywood and DTLA. That transit access gives ADU rentals here a measurable rent premium over comparable units in neighboring Burbank or Van Nuys.
The housing stock is equally distinctive: post-WWII wood-frame stucco ranch and bungalow homes built roughly 1945-1968 on standard 6,000-7,500 sq ft lots, most with a detached one- or two-car garage set back to a rear alley. Because these properties fall under LADBS jurisdiction rather than an incorporated city, they benefit from LA’s comparatively permissive ADU rules, including the pre-approved Standard Plan program.
The climate is punishing. Summer heat events routinely hit 105-112°F, running 15-20°F hotter than coastal LA. Title 24 mechanical cooling compliance and cool-roof requirements are non-negotiable. Wide day-night temperature swings, sometimes 40°F in summer, accelerate moisture cycling in aging stucco and complicate tying new framing into 60-year-old foundations.
Two surprises catch nearly every first-time ADU homeowner here: the original garage was often built to the rear property line, so any expansion triggers a setback variance that locks scope to the existing footprint; and the main house panel, typically a 100-amp original service, cannot legally support an ADU under LADBS rules, forcing a 200-amp upgrade before the permit can close.
Our Main North Hollywood Services
North Hollywood homeowners call us most often for these three services, each with its own dedicated page and pricing:
ADU Design & Permitting in North Hollywood
We produce the full permit set, structural calculations, and LADBS coordination as a single deliverable, not an afterthought. In North Hollywood, that means navigating LA’s Standard Plan program where applicable, or producing a custom set when your garage sits on a zero-lot-line rear boundary that triggers setback variance work. Every drawing is produced in-house; nothing is outsourced to a drafter you’ll never meet. ADU Design & Permitting in North Hollywood covers the full scope.
Garage Conversion ADU in North Hollywood
The classic North Hollywood project: that 1950s-60s detached alley-accessed garage, already roofed and slabbed, converted to a permitted dwelling unit. The alley provides natural separate circulation, keeping main house and ADU entrances fully independent. We handle the structural assessment, the 200-amp panel upgrade that LADBS requires, and the Title 24 compliance that valley heat demands. Garage Conversion ADU in North Hollywood has full details.
New Detached ADU in North Hollywood
When the existing garage won’t convert, or when the lot has usable rear yard beyond it, we design and build a new detached unit from foundation to finish. In North Hollywood, that means cool-roof specification, mini-split sizing for 110°F days, and careful coordination with LADBS on setback and height limits. We also specify prefab systems from brands like Cover and Dvele within the same single contract. New Detached ADU in North Hollywood explains the process.
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.
Junior ADU & Interior Conversion in North Hollywood
Junior ADU & Interior Conversion turns existing interior space, attached structures, or underutilized volumes into permitted living units without expanding the building envelope. In North Hollywood, this means working with 1950s-60s ranch bones: low ceiling heights in basements, shallow foundation footings, and original 100-amp services that cannot support additional load. Junior ADU & Interior Conversion covers our full methodology. The metro-rail rent premium here makes even a 500-square-foot JADU a genuine income asset, not just a guest room with a kitchenette.
Basement ADU
Signs you need it
You have a full or partial basement with headroom at or above 7 feet 6 inches, and the floor is currently storage or unfinished space.
What it costs in North Hollywood
Basement ADU conversions in North Hollywood typically run $110,000-$175,000 all-in, including egress window installation, moisture barrier remediation, and the separate mechanical system Title 24 requires.
How we do it
We verify headroom and soil conditions, design the egress and ventilation strategy, produce the LADBS permit set, and build the interior fit-out with documented photo records at every visit.
Room-to-ADU Conversion
Signs you need it
You have a ground-floor bedroom suite, den, or attached wing with direct exterior access and its own bathroom rough-in.
What it costs in North Hollywood
Room-to-ADU conversions in North Hollywood typically run $85,000-$145,000 all-in, depending on whether the kitchen and bathroom need full plumbing rough-in or can adapt existing lines.
How we do it
We assess the existing plumbing and electrical capacity, design the kitchen and bath layout to JADU code, submit the LADBS permit set, and build to the drawings with the 365-Day Done Right Promise in writing.
What Junior ADU & Interior Conversion Costs in North Hollywood
| Item | Typical range in North Hollywood |
|---|---|
| Basement ADU conversion | $110,000 - $175,000 |
| Room-to-ADU conversion | $85,000 - $145,000 |
| Above-garage ADU (new floor system) | $125,000 - $195,000 |
Does a Junior ADU need its own meter in North Hollywood?
No. Under LADBS rules, a Junior ADU shares utilities with the primary residence and does not require a separate electric or water meter, though we still specify a sub-panel and shutoff for safety. Call (626) 427-9813 for an exact quote on your layout - estimates are free.
Can I convert my basement if the ceiling is low?
LADBS requires 7 feet 6 inches minimum finished ceiling height for habitable space; we measure during our first site visit and document exactly what excavation or beam modification would cost if needed. Call (626) 427-9813 for an exact quote - estimates are free.
ADU Site Prep & Utilities in North Hollywood
ADU Site Prep & Utilities handles everything that must be in the ground or on the pole before the structure goes up. In North Hollywood, this means 100-amp to 200-amp panel upgrades that LADBS mandates for nearly every ADU, foundation work on expansive valley soil, and utility trenching through 60-year-old lots with mature root systems and unmapped prior improvements. ADU Site Prep & Utilities details our full scope. The 40°F summer day-night swings here also mean moisture management in any new foundation or slab work is critical to long-term performance.
Electrical Panel Upgrade
Signs you need it
Your main panel is a 100-amp original service with no spare breaker slots, or LADBS has flagged insufficient capacity during ADU plan check.
What it costs in North Hollywood
Electrical panel upgrades in North Hollywood typically run $4,500-$8,500 for the 200-amp service, including permit, inspection, and SCE coordination.
How we do it
We pull the LADBS electrical permit, coordinate with SCE for service disconnect, install the new 200-amp panel and grounding system, and pass inspection before the ADU permit proceeds.
Foundation & Grading
Signs you need it
Your garage slab is cracked, under 4 inches thick, or built without footings; or you’re building new detached on a sloped or fill-compacted lot.
What it costs in North Hollywood
Foundation and grading work in North Hollywood typically runs $12,000-$28,000 for a new detached ADU slab and footings, or $8,000-$18,000 for garage slab remediation and reinforcement.
How we do it
We test soil bearing, design the footing and slab to LADBS standards for expansive soil, grade for drainage away from both structures, and document the rebar and pour with photo records.
What ADU Site Prep & Utilities Costs in North Hollywood
| Item | Typical range in North Hollywood |
|---|---|
| Electrical panel upgrade (100A to 200A) | $4,500 - $8,500 |
| Foundation & grading (new detached) | $12,000 - $28,000 |
| Plumbing lateral extension | $3,500 - $7,500 |
Is the panel upgrade always required?
Yes for nearly every North Hollywood ADU: LADBS calculates load based on square footage and requires 200-amp service when the combined dwelling load exceeds 100 amps, which a main house plus any ADU almost always does. Call (626) 427-9813 for a load calculation on your specific setup - estimates are free.
Can site prep start before permits are approved?
No; LADBS requires permit issuance before any work that affects structure, electrical, or plumbing, though we use the plan-check period to order long-lead materials and schedule SCE coordination. Call (626) 427-9813 to discuss your timeline - estimates are free.
Brands We Service in North Hollywood
We specify and coordinate prefab and modular systems from Cover, Dvele, and Mighty Buildings within the same single contract, handling factory liaison, transport logistics, and on-site crane set. Our crews are fluent in these systems’ connection details and warranty requirements. See our brands for full coverage.
Pricing for ADU in North Hollywood, CA
| Service | Typical range in North Hollywood |
|---|---|
| Junior ADU / Room-to-ADU conversion | $85,000 - $145,000 |
| Basement ADU conversion | $110,000 - $175,000 |
| Above-garage ADU (new floor) | $125,000 - $195,000 |
| Electrical panel upgrade (100A to 200A) | $4,500 - $8,500 |
| Foundation & grading, new detached | $12,000 - $28,000 |
| Foundation remediation, garage conversion | $8,000 - $18,000 |
| Plumbing lateral extension | $3,500 - $7,500 |
| Gas line extension | $2,500 - $5,500 |
What pushes price up in North Hollywood: zero-lot-line rear garages that require setback variance work instead of expansion; 100-amp panels that must upgrade to 200 amps; and cool-roof and mechanical specifications driven by 110°F summer design temperatures. Under Haven Standard Clause 1, the written price you receive before work starts is the price you pay - no change orders, no door-side upsells.
Neighborhoods We Serve in North Hollywood
We work across North Hollywood’s full residential fabric, from the Metro-adjacent blocks to the deeper valley floor. Dispatch and scheduling are coordinated from our Los Angeles office; crews serve North Hollywood locally with same-week site visits for active projects.
- NoHo Arts District
- Valley Village (north of Magnolia)
- Toluca Woods
- Laurel Canyon (North Hollywood adjacency)
- Colfax Meadows
Service Area - Cities Near North Hollywood
Our crews work the full east and central San Fernando Valley and adjacent foothill cities. We regularly coordinate permits and inspections in Burbank, CA, where the city runs its own building department with different timelines than LADBS; Glendale, CA, with its distinct hillside grading requirements; Pasadena, CA, where design review adds a layer to the permit process; and Alhambra, CA, with its older housing stock and narrower lot patterns.
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 ADU submissions typically clear in 4-6 weeks; custom designs run 8-14 weeks depending on complexity and correction cycles. We track every submittal and respond to corrections within 48 hours to keep the timeline tight.
California law (AB 670 and SB 328) prohibits HOAs from outright banning ADUs, but some North Hollywood PUDs and condo associations still attempt restrictive covenants; we review your CC&Rs during our first site visit and document any conflict before permit submittal.
Los Angeles Rent Stabilization Ordinance properties can add ADUs under state law, but tenant notification and relocation rules apply; we coordinate with housing department requirements as part of our permit set preparation, not as an afterthought.
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 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."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."Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H.