ADU in North Hollywood, CA
Junior ADU & Interior Conversion in North Hollywood typically runs $85,000-$175,000 all-in, drawings through final inspection, while ADU Site Prep & Utilities adds $25,000-$75,000 depending on whether your post-war ranch needs a panel upgrade or sewer lateral replacement. We’re Ellery ADU Studio, and our Los Angeles office dispatches crews to North Hollywood daily. Call (424) 551-7706 for a free estimate with a written price before any work starts, per Haven Standard Clause 1.
North Hollywood’s housing stock - ranch homes built 1945 to 1970 on alley-platted lots - creates a specific opportunity. These properties often have underutilized basements, attached garages, or spare rooms that convert to rental units faster than ground-up construction. The Metro B Line station at Lankershim and Chandler makes these ADUs unusually valuable on the rental market.
Why North Hollywood Homes Are Different
The San Fernando Valley heat sink hits North Hollywood harder than almost anywhere in LA. Summer highs regularly run 10-15°F above the coastal westside, which means Title 24 energy compliance demands higher-R insulation and greater mechanical cooling capacity than beachside ADU designers spec. We’ve seen radiant heat gain from slab-on-grade garage floors fail habitability inspections - the concrete bakes all day and releases heat into the living space all night.
Most North Hollywood ranches carry original 100-amp panels and galvanized supply lines or cast-iron drains that won’t pass LA’s final inspection. The alley-platted blocks are a double-edged sword: alley access can qualify your ADU for reduced rear-yard setbacks, but only if the Bureau of Engineering confirms the alley hasn’t been vacated. Out-of-area firms miss this routinely.
Unlike Burbank or Glendale, North Hollywood sits inside City of LA limits, so you access the pre-approved Standard Plan program that cuts plan-check timelines. No separate municipal process.
Our Main North Hollywood Services
Homeowners in North Hollywood call us most often for these three services:
ADU Design & Permitting in North Hollywood
We produce the permit set as the core product, not an afterthought. For North Hollywood’s Standard Plan-eligible projects, we coordinate with LA Department of Building and Safety to compress plan-check timelines. Every set includes Title 24 calcs tuned for Valley heat loads. ADU Design & Permitting in North Hollywood covers feasibility, site plans, and full construction documents.
Garage Conversion ADU in North Hollywood
The detached one- and two-car garages on alley-platted lots here convert efficiently under LA’s streamlined pathway. We verify alley status with Bureau of Engineering before finalizing setbacks, then address slab condition, panel capacity, and drainage. Garage Conversion ADU in North Hollywood includes full design-build delivery.
New Detached ADU in North Hollywood
Where lot coverage allows, we design and build standalone units from foundation to final inspection. For prefab-compatible sites, we specify and coordinate systems from Cover, Dvele, or Mighty Buildings within the same single contract. New Detached ADU in North Hollywood covers custom and modular options.
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 in North Hollywood unlocks rental income from existing square footage - basements, above-garage spaces, spare rooms, and attached additions - without the cost or timeline of ground-up construction. Junior ADU & Interior Conversion is our most called-about service here because the 1945-1970 housing stock offers so many conversion candidates, and because the Metro B Line rental premium makes even compact JADUs cash-flow positive. The catch: these older structures almost always need electrical, plumbing, and HVAC brought to current code before LA will issue a certificate of occupancy.
Basement ADU
Signs you need it
You have a partially finished basement with headroom at or above 7 feet 6 inches, separate exterior access, and you’re not using the space for storage.
What it costs in North Hollywood
Basement ADU conversions in North Hollywood typically run $95,000-$165,000 all-in, including egress windows, moisture remediation, and full MEP rough-in.
How we do it
We test for moisture intrusion, design egress window placement to meet LA Fire requirements, rough in electrical and plumbing to avoid the existing slab where possible, and deliver a permit-ready set with Title 24 compliance for below-grade thermal performance.
Room-to-ADU Conversion
Signs you need it
You have a 400+ square foot attached room - often a former master suite or bonus room - with independent exterior access potential and a separate bathroom rough-in.
What it costs in North Hollywood
Room-to-ADU conversions in North Hollywood typically run $85,000-$140,000 all-in, depending on whether the existing space needs kitchenette addition and separate metering.
How we do it
We verify the existing foundation and framing can support residential load, design kitchenette and bathroom layouts within the JADU size limits, and coordinate with LADBS for utility separation or shared-service approval.
What Junior ADU & Interior Conversion Costs in North Hollywood
| Item | Typical range in North Hollywood |
|---|---|
| Basement ADU conversion | $95,000 - $165,000 |
| Room-to-ADU conversion | $85,000 - $140,000 |
| Above-garage ADU (structure permitting) | $110,000 - $175,000 |
Can a Junior ADU have its own electric meter in North Hollywood?
Yes, but LADBS typically allows shared electrical service for JADUs under 500 square feet, which avoids the $8,000-$15,000 separate-meter cost. We evaluate both options during feasibility. Call (424) 551-7706 for an exact quote - estimates are free.
How long does a room-to-ADU conversion take in North Hollywood?
Design and permitting run 3-4 months; construction adds 2-3 months. LA’s Standard Plan program doesn’t apply to interior conversions, so full plan-check is required. Call (424) 551-7706 for an exact quote - estimates are free.
ADU Site Prep & Utilities in North Hollywood
ADU Site Prep & Utilities in North Hollywood addresses the infrastructure gap that stops most conversions before they start: original 100-amp panels, galvanized supply lines, cast-iron drains, and slab-on-grade foundations that weren’t built for residential load. ADU Site Prep & Utilities is where we separate feasible projects from ones that need significant prep - and where we document exactly what your property requires before construction pricing is finalized. The Valley heat and aging infrastructure here make this step non-negotiable.
Electrical Panel Upgrade
Signs you need it
Your panel is 100 amps or less, has fused disconnects rather than breakers, or shows corrosion from decades of Valley heat cycling.
What it costs in North Hollywood
Electrical panel upgrades in North Hollywood typically run $4,500-$8,500 for 200-amp service, including permit, inspection, and LADWP coordination.
How we do it
We verify LADWP service capacity, design the new panel location for ADU sub-panel access, pull permits, and coordinate inspection timing to avoid construction delays.
Plumbing Lateral
Signs you need it
Your home has original galvanized supply or cast-iron drainage, visible corrosion, or pressure below 40 PSI at hose bibs.
What it costs in North Hollywood
Plumbing lateral replacement in North Hollywood typically runs $8,000-$18,000 for sewer and $3,500-$7,500 for water, depending on trench length and street-to-house distance.
How we do it
We camera the existing line, locate the city connection point, design trenching to minimize hardscape disruption, and coordinate with LA Sanitation for sewer tie-in inspection.
What ADU Site Prep & Utilities Costs in North Hollywood
| Item | Typical range in North Hollywood |
|---|---|
| Electrical panel upgrade (200A) | $4,500 - $8,500 |
| Plumbing lateral - sewer replacement | $8,000 - $18,000 |
| Plumbing lateral - water supply replacement | $3,500 - $7,500 |
Do I need to upgrade my electrical panel for a Junior ADU?
Often yes. A 100-amp panel serving a main house plus JADU with kitchenette and HVAC will fail load calculation. We verify during feasibility. Call (424) 551-7706 for an exact quote - estimates are free.
Who handles the city permits for utility work?
We pull all permits - LADBS for electrical and plumbing, LA Sanitation for sewer lateral, LADWP for service upgrades - as part of the single contract. Call (424) 551-7706 for an exact quote - estimates are free.
Brands We Service in North Hollywood
We specify and coordinate prefab and modular systems from Cover, Dvele, Mighty Buildings, and Boxabl within our single-contract design-build model. Parts and technical documentation are stocked locally through our Los Angeles office, with brand-specific coordination handled in-house rather than subcontracted. See our brands for full specifications.
Pricing for ADU in North Hollywood, CA
| Service | Typical range in North Hollywood |
|---|---|
| Basement ADU conversion | $95,000 - $165,000 |
| Room-to-ADU conversion | $85,000 - $140,000 |
| Above-garage ADU | $110,000 - $175,000 |
| Electrical panel upgrade (200A) | $4,500 - $8,500 |
| Sewer lateral replacement | $8,000 - $18,000 |
| Water supply replacement | $3,500 - $7,500 |
| Foundation & grading (new detached) | $15,000 - $35,000 |
| Gas line extension | $2,500 - $6,000 |
Prices push higher in North Hollywood when we hit non-compliant existing conditions: undersized footings, unpermitted prior work, or alley vacation status that changes setback requirements. Every project is quoted with a written price before any work begins, per Haven Standard Clause 1 - no change orders for scope we’ve already documented.
Neighborhoods We Serve in North Hollywood
Our crews work across North Hollywood’s residential pockets, from the Metro-adjacent blocks to the hillside edges. Response and scheduling are coordinated from our Los Angeles office with same-week site visits standard.
- NoHo Arts District
- Valley Village (LA City portion)
- Toluca Woods
- Laurel Canyon-adjacent foothills
- Camarillo Street corridor
Service Area - Cities Near North Hollywood
We serve homeowners throughout the east Valley and adjacent hills. If you’re near North Hollywood, we likely cover your area: Studio City, CA across Laurel Canyon, Van Nuys, CA to the west, Burbank, CA to the east, and Sherman Oaks, CA to the southwest. Each city has its own permitting framework - LA City for North Hollywood, Burbank’s separate municipal process - and we maintain active permits in all jurisdictions.
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
Feasibility and site measure typically happen within one week of your call. Design and permitting run 3-4 months for interior conversions, 2-3 months for Standard Plan-eligible garage conversions. We don’t start construction until the permit set is approved and the written price is locked under Haven Standard Clause 5.
Most North Hollywood neighborhoods predate HOAs, but hillside zones and newer infill pockets may have covenants. We review title and CC&Rs during feasibility - it’s a standard line item in our documentation, not an extra fee.
We pull every permit - LADBS, LA Sanitation, LADWP, and any Bureau of Engineering alley verification - as part of the single contract. You receive copies of all approvals and inspection sign-offs, plus the documented photo record from every site visit.
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
"Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H."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."Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
- Arjun D.