ADU Site Prep & Utilities Cost - Design, Permits and Build Under One Contract

How Much Does ADU Site Prep & Utilities Cost in North Hollywood?

ADU Site Prep & Utilities services in North Hollywood typically cost between $18,000 and $65,000, depending on lot conditions, distance to utility connections, and whether the city requires upgraded service capacity. Most North Hollywood projects Ellery ADU Studio has permitted since 2015 land between $28,000 and $45,000 when site conditions are average – meaning a relatively flat lot, existing 200-amp electrical service, and sewer laterals within 50 feet of the proposed ADU footprint. Every figure on this page comes with a written price before any work starts, per Haven Standard Clause 1.

ADU Site Prep & Utilities Cost Breakdown (2026)

The table below reflects current subcontractor and permit costs in the North Hollywood market. These are real ranges from permitted projects, not national averages copied from a trade publication. Because North Hollywood sits in a seismically active zone and shares infrastructure with one of the most densely developed parts of the San Fernando Valley, utility extension costs here run about 15-20% higher than outer suburban markets.

Total typical range: $18,000 – $65,000. The median project in North Hollywood – 600 sq ft detached ADU, average lot, all-electric, no major demolition – runs about $32,000 – $38,000 for site prep and utilities alone, before the ADU structure itself. That figure gets locked in writing before we touch the first shovel, per Haven Standard Clause 1.

What pushes cost toward the high end is usually one of three things: a long trench run because the main sewer or electrical service is at the front of a deep lot; a geotechnical report that identifies expansive soils requiring special foundation treatment; or an existing structure on the proposed ADU footprint that needs full demolition. On our ADU Site Prep & Utilities in North Hollywood service page, you can see the full scope of what each phase covers and how the one-contract model keeps costs from migrating between trades.

What Affects ADU Site Prep & Utilities Pricing in North Hollywood

No two lots in North Hollywood price out the same. The factors below are the ones that move the number most – and the ones we assess during your site evaluation before quoting a single dollar.

• Lot topography and soil conditions. North Hollywood’s older residential tracts – especially the streets west of Tujunga Avenue between Magnolia and Oxnard – sit on fill soils with moderate expansion potential. A geotechnical report here sometimes triggers a deeper caisson foundation or a post-tension slab, which adds $6,000 – $14,000 to the structural line and requires additional grading to match. Lots closer to the NoHo Arts District on Lankershim tend to have more uniform soil profiles.
• Distance from the main structure to the ADU footprint. Every additional 10 feet of trench for sewer, water, or electrical adds roughly $400 – $700 in labor and materials at current North Hollywood subcontractor rates. A 120-foot deep lot with the ADU at the rear adds real money compared to a garage conversion 20 feet from the panel.
• Existing electrical service capacity. Homes built before 1980 in North Hollywood frequently have 100-amp service, which is not enough to support an ADU with a mini-split heat pump and a full kitchen. An LADWP-coordinated service upgrade to 200-amp adds $6,500 – $9,000 and requires a separate meter application that can take 6-10 weeks.
• Sewer lateral age and condition. Streets in North Hollywood that were developed before 1965 – the grid between Lankershim and Vineland, for example – often have original clay tile laterals. If a camera inspection during pre-design due diligence finds cracks or root intrusion, the lateral may need full replacement rather than a simple tap. That difference is $3,000 – $5,000.
• Demolition scope. A detached garage that needs to come down adds $4,500 – $7,500 on average. A concrete slab that doesn’t match the ADU footprint requires partial demolition and re-pour. Asbestos-containing materials – a real concern in North Hollywood homes built between 1945 and 1978 – require licensed abatement, which typically runs $2,500 – $6,000 for a single-car garage.
• Stormwater management requirements. Los Angeles’s Low Impact Development ordinance applies to most ADU projects that disturb more than 500 square feet of existing impervious surface. In North Hollywood, where lots are often heavily paved, this frequently triggers a drywell or a small bioretention area. The engineering and construction cost runs $1,500 – $5,000 depending on soil permeability.
• All-electric versus gas. Routing a new gas lateral from the SoCal Gas main adds $2,000 – $5,500 and introduces a separate utility coordination timeline that can add 4-8 weeks to the schedule. Ellery specifies all-electric on most new detached ADUs in North Hollywood to keep the utility coordination simple – one utility (LADWP), one schedule, one permit track.

North Hollywood Permit & Code Context You Should Know

North Hollywood is a neighborhood within the City of Los Angeles, so permits run through the Los Angeles Department of Building and Safety (LADBS) and utility work coordinates with LADWP and, where gas is involved, SoCal Gas. That matters because LA’s permitting infrastructure is more complex – and in some cases more expensive – than the permitting environment for ADUs in adjacent cities like Burbank or Glendale, which have their own building departments and utility agencies.

California’s ADU law (Government Code Section 65852.2, as amended) limits some impact fees for ADUs under 750 square feet, but it does not limit LADWP connection fees or the cost of private sewer lateral work. Those costs are real and they belong on the page. For a 600 sq ft detached ADU in North Hollywood, expect LADBS permit fees of $4,500 – $6,000, an LADWP meter application fee of $300 – $600, and a sewer connection fee (Bureau of Sanitation) of $1,000 – $2,500 depending on the project’s tributary area calculation.

North Hollywood lots also fall under the City of Los Angeles’s Hillside Construction Regulation for any parcel above the 1 percent slope threshold designated in the Grading Code – though most of the flat valley floor in NoHo doesn’t trigger this. If your address is on the transition zone near the Santa Monica Mountains or the Verdugo Hills, a more detailed grading plan may be required, which adds $2,000 – $4,500 in engineering fees.

Nadia Ellery reviews the permit file on every project before we write the price. If there is a condition on your lot – a recorded easement, a prior grading permit, a drainage note in the title report – it goes into the written scope before you sign anything. That is what Haven Standard Clause 1 means in practice: the number on the contract is the number you pay.

How to Save on ADU Site Prep & Utilities in North Hollywood

Site prep and utilities are largely cost-driven by physics and local infrastructure – you cannot negotiate away a 90-foot sewer trench. But there are real decisions that change the price, and making them early saves more than making them after the permit is already filed.

• Go all-electric from the start. Eliminating the gas lateral saves $2,000 – $5,500 in materials and avoids SoCal Gas coordination entirely. California’s Title 24 energy code makes an all-electric heat pump system competitive in operating cost, and the simplified utility footprint genuinely cuts schedule risk in North Hollywood, where LADWP has a better track record for ADU connections than SoCal Gas in the current permitting environment.
• Match the ADU footprint to the existing sewer lateral location. When the design stage happens before site prep pricing is locked, we can orient the ADU to minimize trench length. On a typical North Hollywood lot, a 20-foot shift in ADU placement can shave $1,500 – $3,000 off the trench cost. This is exactly why the one-contract design-build model matters: the designer and the site prep crew are working from the same cost sheet, not billing separately.
• Camera-inspect the existing sewer lateral before design is finalized. A lateral inspection costs $300 – $500. Finding a failed lateral after permits are pulled costs $3,000 – $8,000 in unplanned work and schedule delay. Ellery includes a lateral inspection recommendation in the pre-design due diligence phase on every North Hollywood project – it is one of the most reliable ways to protect the written price.
• Avoid disturbing existing impervious surface beyond what the ADU requires. Every additional 100 square feet of impervious disturbance increases the probability of triggering a stormwater management requirement. Designing a precise construction access path and protecting existing hardscape reduces both disturbance and LID compliance cost.
• Schedule the LADWP service upgrade application early. LADWP’s ADU connection queue in the San Fernando Valley runs 6-14 weeks. Filing the application before permits are in hand is not always possible, but filing immediately on permit issuance is. Delays in utility connection are the most common cause of schedule overrun on North Hollywood ADU projects, and they are almost always avoidable with early application.
• Get a second opinion on any written estimate you already have. Ellery offers a free second opinion on any written site prep estimate. If another firm quoted you $52,000 for a project that should run $34,000, we will tell you why – line by line – at no charge. Call (424) 407-8266 and bring the written quote.

Prefab and Modular ADUs: Does Site Prep Cost Less?

It’s a fair question, and the short answer is: sometimes marginally, but not as much as prefab manufacturers typically suggest. Brands like Abodu, Cover, Dvele, Plant Prefab, and Mighty Buildings deliver a finished unit to the site – which compresses the construction schedule significantly – but the utility trench, the foundation, the LADWP service upgrade, and the LADBS permit process are all identical to a site-built ADU. The savings from prefab come on the vertical construction side, not the site prep side.

Where Ellery adds value in a prefab project is coordination: we spec the foundation to match the manufacturer’s published load requirements, schedule the LADWP connection to coincide with the delivery window, and carry the permit set under our license so the homeowner has one point of accountability. A Boxabl or Tuff Shed-based conversion requires the same soil report, the same utility connections, and the same LA Bureau of Sanitation fees as any other ADU – it just arrives faster once the pad is ready. We handle that coordination under the same single contract, at the same written price, regardless of which system you choose.

FAQs – ADU Site Prep & Utilities Cost in North Hollywood

How much does ADU site prep cost in North Hollywood, CA?

ADU site prep in North Hollywood typically costs $18,000 – $65,000, with most projects landing between $28,000 and $45,000 when lot conditions are average. The biggest variables are trench length for utilities, whether an electrical panel upgrade is needed, and the condition of the existing sewer lateral. Ellery provides a written price before any work begins – call (424) 407-8266 for a site evaluation and written quote.

What does a sewer lateral extension cost for an ADU in North Hollywood?

A sewer lateral extension for an ADU in North Hollywood typically runs $4,000 – $11,500. The lower end applies when the main structure’s lateral is in good condition and the ADU sits within 30 feet of the clean-out. The higher end applies to older properties – particularly those on streets developed before 1965, where clay tile laterals may need full replacement rather than a simple tap. A camera inspection ($300 – $500) before design is finalized is the most cost-effective way to know which scenario you’re in. Call (424) 407-8266 – estimates are provided in writing.

How much does an LADWP electrical service upgrade cost for an ADU?

An LADWP electrical service upgrade from 100-amp to 200-amp in North Hollywood typically costs $6,500 – $9,000 for the upgrade itself, plus $2,800 – $6,500 for the trench and conduit run to the ADU. The upgrade application takes 6-14 weeks through LADWP’s San Fernando Valley queue, so filing immediately on permit issuance – not after construction starts – is critical to keeping the project on schedule. Call (424) 407-8266 to discuss where your current service stands.

Are ADU utility permits and connection fees included in site prep quotes?

They should be, but many contractors quote site prep labor only and list permit fees and LADWP connection fees as separate line items that arrive later as surprises. At Ellery ADU Studio, LADBS permit fees, LADWP meter application fees, and Bureau of Sanitation connection fees are included in the written price under Haven Standard Clause 1. The number on the contract is the number you pay – no door-side additions. Call (424) 407-8266 to see a sample written scope.

Does an ADU in North Hollywood require a geotechnical (soils) report?

Yes, in most cases. The City of Los Angeles requires a geotechnical report for new detached ADUs, and North Hollywood’s soil profile – which includes expansive clay in several of the older residential tracts west of Tujunga Avenue – sometimes triggers additional foundation requirements beyond a standard slab. A soils report typically costs $1,800 – $4,200 in this market. Ellery reviews the geotechnical findings before the foundation line item is written into the price, so there are no foundation surprises after permits are filed. Call (424) 407-8266 for a site assessment.

How long does ADU site prep take in North Hollywood?

Physical site prep – grading, demolition, foundation, and utility rough-ins – typically takes 6-10 weeks for a standard detached ADU in North Hollywood. The longer variable is utility coordination: LADWP service upgrades currently run 6-14 weeks from application to energization in the San Fernando Valley. Ellery files the LADWP application at the earliest possible moment and tracks the queue as part of standard project management, because a delayed utility connection is the most common avoidable cause of schedule overrun in this market.

Key Takeaways

• ADU site prep and utilities in North Hollywood cost $18,000 – $65,000; the median project runs $32,000 – $38,000.
• The biggest cost drivers are trench length, electrical panel capacity, sewer lateral condition, and whether demolition is required.
• LADWP service upgrade applications take 6-14 weeks – file immediately on permit issuance or sooner.
• Prefab ADU brands (Abodu, Cover, Dvele, Plant Prefab) save on construction time, not on site prep cost.
• Ellery provides every price in writing before work starts, per Haven Standard Clause 1, and the written price is what you pay.
• A free second opinion is available on any written estimate you already hold – call (424) 407-8266.
• North Hollywood permits run through LADBS and LADWP, which have different timelines and fee structures than Burbank or Glendale – local knowledge here is not interchangeable.

Get a Written Site Prep Price for Your North Hollywood ADU

Nadia Ellery and the Ellery ADU Studio team have been working through LADBS and LADWP since 2015, on projects from the NoHo Arts District to the streets east of Lankershim and south toward Magnolia. We know what the soils report is likely to say, we know where the utility queues slow down, and we know which lot conditions push site prep toward the high end of the range before we’ve even pulled the title report. That knowledge goes into the written price we give you before any work begins – not into a verbal ballpark on a phone call.

If you’re evaluating site prep costs for a North Hollywood ADU and you want a written number, or if you have a quote in hand and want a second opinion, call (424) 407-8266. A live person answers. You can also learn more about how we structure the full scope on the home page, or go deeper on the service itself at ADU Site Prep & Utilities in North Hollywood. Every estimate is free, every price is written, and the 365-Day Done Right Promise covers the finished work in the same document as the scope.

Pricing reflects the North Hollywood market as of 2026. Ellery ADU Studio North Hollywood offers free estimates – call (424) 407-8266.

Written by Nadia Ellery, Owner at Ellery ADU Studio, serving North Hollywood, CA since 2015.