New Detached ADU in North Hollywood - Design, Permits and Build Under One Contract

Fast, Reliable New Detached ADU Across North Hollywood

New detached ADUs in North Hollywood typically run $220,000-$380,000 all-in, from permit set through final inspection, depending on whether you build custom or install a prefab system. A typical project takes 8-14 months in this market, with plan check at LA Department of Building and Safety running 3-5 months for detached units on R-1 lots. Call (424) 407-8266 to schedule your free estimate - every project receives a written price before any work starts, per Haven Standard Clause 1.

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We’re the New Detached ADU team at Ellery ADU Studio, and we’ve designed, permitted, and built ADUs across North Hollywood since 2015 - from the post-war stucco ranches near the NoHo Arts District to the alley-accessed lots off Camarillo Street and the residential blocks threading toward the B Line station. Our permit sets are prepared in-house, our crews are background-checked and uniformed, and a live person answers calls 24/7. Scheduling and plan-check coordination run from our Los Angeles office, but the crews serving your North Hollywood property are local.

Why Ellery ADU Studio North Hollywood Is North Hollywood’s Preferred New Detached ADU Company

We’ve completed over 900 ADUs across Los Angeles County since 2015, and a significant share of those have been in North Hollywood’s dense corridor of post-WWII tract homes. Our North Hollywood clients receive the same documentation every time: a written price before work starts, a permit set prepared as the core deliverable (not an afterthought), and a 365-Day Done Right Promise backed in writing - if the finished ADU isn’t built to the permitted drawings, we make it right.

Our response time to North Hollywood inquiries is same-day during business hours, and our field crews are already working Valley jobs several days a week. That matters when you’re trying to coordinate a site inspection around your own schedule, or when plan check at LADBS returns a correction and you need a revised sheet turned around fast. We know which North Hollywood blocks fall inside the NoHo Metro B Line Transit Priority Area, which ones don’t, and exactly how that affects your parking requirement - a distinction that changes project feasibility on some lots.

Reviews from North Hollywood homeowners consistently cite two things: the photo documentation we provide after every site visit (no summary of how it felt, just images of what we found and what we did), and the fact that the price at signing matched the price at final invoice. Under Haven Standard Clause 5 (No Surprises), the scope is locked at signing. No door-side upsells, no scope creep.

Our New Detached ADU Services in North Hollywood

Custom Built ADU

A custom built ADU in North Hollywood gives you full control over layout, materials, and finish level - critical on the neighborhood’s tight 6,000-7,500 sq ft lots where every foot of setback matters. We design to the specific constraints of your parcel: the alley access point, the legacy garage footprint you’re replacing or building beside, the mature trees that LA’s Protected Tree Ordinance may place off-limits. Custom builds in North Hollywood typically range $280,000-$380,000 all-in, including permit set, LADBS fees, and construction through final inspection. The tradeoff is time: 12-14 months from contract to certificate of occupancy is realistic for a fully custom detached unit in this market.

Prefab ADU Installation

Prefab ADU installation compresses the construction timeline by moving wall assembly and MEP rough-in off-site. In North Hollywood, where summer temperatures regularly hit 100-108°F, we specify prefab systems with thermal envelopes rated for San Fernando Valley heat loads - not coastal specs that underperform here. Abodu and Cover are two systems we’ve coordinated within our single-contract model; we handle site prep, foundation, utility trenching, and final tie-ins, while the manufacturer delivers a weather-sealed module. Prefab detached ADUs in North Hollywood typically run $220,000-$310,000 depending on module size and site complexity. Plan check still moves through LADBS, but construction duration drops to 4-6 months once the module arrives.

Modular ADU

Modular ADUs differ from prefab in their structural certification: they’re built to the same IRC standards as site-built construction, which simplifies permitting in jurisdictions with strict factory inspection requirements. For North Hollywood homeowners on R-1 lots with challenging access - narrow alleys, tight turning radii, overhead power lines - we evaluate whether a modular unit can be craned in or whether a panelized system makes more sense. We’ve coordinated Dvele and Mighty Buildings systems in Valley projects where the thermal performance and seismic bracing exceeded site-built alternatives at comparable cost. Modular detached ADUs in North Hollywood generally fall in the $250,000-$340,000 range.

Studio ADU

A studio ADU - one open living/sleeping space plus kitchenette and bath - is the most common detached unit we design in North Hollywood, and it’s not hard to see why. The neighborhood’s original single-car garages are typically 240-320 sq ft; replacing one with a 350-450 sq ft studio ADU maximizes rental income potential without triggering the more complex parking and open-space calculations that larger units can face. Studio ADUs in North Hollywood typically run $220,000-$290,000 for custom builds, or $180,000-$250,000 for prefab systems. We size the mini-split for Valley heat loads, specify Title 24-compliant envelope assemblies, and ensure the kitchenette meets LA’s habitability standards for independent rental units.

1-Bed & 2-Bed ADU

One-bedroom and two-bedroom detached ADUs require more square footage, which on North Hollywood’s standard lots means either replacing a larger existing structure or building new on a portion of the rear yard. A 1-bedroom detached ADU typically runs $260,000-$330,000; a 2-bedroom unit, $310,000-$380,000. These projects trigger more intensive LADBS review for egress, fire separation, and parking compliance, which is where our in-house permit preparation pays off - we don’t hand off to a separate permit expeditor who may not have walked your specific lot. On TPA-exempt lots near the NoHo Metro station, the zero-replacement-parking rule can free up enough yard area to accommodate a 2-bedroom unit that would be impossible under standard requirements.

Trusted Brands We Service in North Hollywood

We specify and coordinate prefab and modular systems from Tuff Shed, James Hardie, Abodu, and Cover - each selected for thermal performance, seismic rating, and compatibility with LA’s plan-check requirements. For North Hollywood’s extreme summer heat, we default to James Hardie fiber-cement siding over vinyl or wood composites; it holds paint and dimensional stability through decades of 100°F-plus cycles. Tuff Shed’s engineered wood structures work well for studio ADUs on tight budgets where the client plans to finish the interior separately. We don’t push every brand on every lot. We match the system to your parcel, your budget, and your timeline - all within the same single contract, so there’s no designer-versus-builder gap if something doesn’t fit.

Common New Detached ADU Problems We See in North Hollywood Homes

• Uninsulated slab-on-grade garages with no vapor barrier. The 1940s-60s tract garages across North Hollywood were poured directly on native soil with no moisture break. Once we seal the thermal envelope for habitability, ground moisture has nowhere to go. We write slab moisture remediation as a contract allowance before demo, then test and price the exact fix once the floor is exposed - typically a vapor barrier plus rigid insulation or, in severe cases, slab replacement.
• Original 60-amp service and cloth-wrapped wiring. We find this on nearly every pre-1960 North Hollywood garage we open. The existing feed cannot support a subpanel, HVAC, kitchen appliances, and lighting loads. A service upgrade and trenching to the main house adds cost that coastal ADU budgets rarely anticipate, so we flag it during initial inspection and write it as an allowance with a price range, not a surprise.
• Failed waterproofing hidden behind paint. Valley rain isn’t frequent, but when it comes, it comes hard. Decades of painted-over water damage on rear garage walls becomes visible only after demo. We inspect with moisture meters before contract, document what we find, and price any framing repair in writing before touching the rest - Haven Standard Clause 5.
• Permit-triggered code upgrades surfacing after walls are open. Egress window sizing, fire separation between ADU and main house, Title 24 envelope requirements - these aren’t optional extras, they’re code. A contractor who didn’t write allowances into the contract turns them into mid-job change orders. We build them into the initial scope and price them upfront.

Pricing for New Detached ADU in North Hollywood, CA

We Also Serve Cities Near North Hollywood

Our crews work Valley-wide from the same Los Angeles coordination office. We regularly design and build ADUs in North Hollywood and the surrounding communities: Studio City to the south, Van Nuys to the north and west, Burbank to the east, and Glendale to the northeast. Each city has its own planning department, its own ADU ordinance nuances, and its own plan-check timeline - we know the differences because we permit in all of them.

FAQs - New Detached ADU in North Hollywood