ADU in Hollywood, CA
ADU design and permitting in Hollywood typically runs $18,000-$45,000 for the full permit set, depending on whether your lot sits in the flatlands below Franklin Avenue or the fire-zone hills above it. On the alley-grid blocks between Santa Monica Blvd and Melrose Ave, garage conversions are often the fastest path to a rentable unit. In the Hollywood Hills, the same square footage can cost $20,000-$40,000 more once ignition-resistant construction requirements enter the drawings. Call (971) 497-2402 to get a written price on your ADU, drawings through final inspection.
Why Hollywood Homes Are Different
Hollywood splits into two ADU environments at roughly Franklin Avenue. Below it, the flatlands are dense with 1920s-1940s Spanish Colonial Revival and Craftsman bungalows, many with detached one-car garages on narrow alley-served lots. Those garages are the archetypal conversion candidates, but they were frequently built with no perimeter foundation, just a floating slab poured directly on grade. A contractor who quotes a garage ADU here without pulling up a slab corner to check bearing condition can discover mid-permit that the structure needs full stem-wall underpinning before the city signs off on a change of occupancy. That single surprise runs $15,000-$25,000 before framing begins.
Above Franklin, the calculus changes. Much of the Hollywood Hills falls within the Very High Fire Hazard Severity Zone, which triggers Class A roofing, multi-pane windows, and ember-resistant vents on any new ADU structure, even a simple garage-to-studio conversion that would need no fire-rated assemblies two miles south in the flats. Santa Ana wind events make this compliance non-negotiable. And on several flatland blocks inside Historic Preservation Overlay Zones like Melrose Hill, a new detached ADU must pass visual-compatibility review, a hurdle that does not exist in adjacent unincorporated LA County areas.
Our Main Hollywood Services
Two ADU paths account for most of the work we do in Hollywood. Both start with the same written price guarantee, and both are shaped by the housing stock and permit realities described above.
Garage Conversion ADU in Hollywood
In the Hollywood flatlands, the detached 1920s garage is often the single best ADU asset on the property. LA City’s zero-setback conversion rules make these structures highly viable, but the original slabs and wiring rarely meet current habitable-space code. We inspect the slab bearing condition, map the electrical panel capacity, and produce a permit set that accounts for what is actually there, not what a satellite photo suggests. See the full service breakdown on our Garage Conversion ADU in Hollywood page.
New Detached ADU in Hollywood
A new detached ADU on a Hollywood hillside lot is a different animal from a flatlands build. Grading permits, geotechnical review, and VHFHSZ fire-hardening requirements all enter the drawings before the first footing is poured. We coordinate the full design, permitting, and construction sequence under one contract so the geotech report and the window spec stay aligned. Read the detailed scope on our New Detached ADU in Hollywood page.
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.
ADU Design & Permitting in Hollywood
ADU design and permitting in Hollywood is where a project either gets its footing or starts bleeding money. The 1920s-1940s bungalows that dominate the flatlands carry knob-and-tube wiring, shallow floating slabs, and original lath-and-plaster that HPOZ review may require you to match. Above Franklin, the fire-zone requirements change the roof assembly, the window spec, and the venting strategy before you ever draw a floor plan. Our ADU Design & Permitting service produces a permit set that anticipates these conditions, because the drawings are the contract, and the contract is the price.
Site Assessment
Signs you need it
Your lot is on a slope, in an HPOZ, or the existing garage shows slab cracking at the corners.
What it costs in Hollywood
Site assessment in Hollywood runs $1,000-$3,000, including a slab bearing check and lot line verification.
How we do it
We pull the slab corner, check the bearing condition, map utilities, and run the zoning envelope before a single drawing line is committed.
ADU Design & Blueprints
Signs you need it
You know the unit size you want but not whether the lot geometry, fire zone, and HPOZ rules will allow it.
What it costs in Hollywood
Full architectural blueprints for an ADU in Hollywood run $8,000-$20,000, fire-zone assemblies included where required.
How we do it
We draw the floor plan, elevations, and structural sheets, then run the fire-zone and HPOZ compatibility checks before the permit set goes out.
Permit Application
Signs you need it
You have a rough design but no stamped drawings, no planning checklist, and no time to sit at the LA Department of Building and Safety counter.
What it costs in Hollywood
Permit application and city coordination in Hollywood runs $3,000-$8,000, with resubmittal fees billed at cost.
How we do it
We submit the full permit set, track city comments, and respond to each round of review until the permit is issued.
HOA & Zoning Compliance
Signs you need it
Your Hollywood home sits inside a registered HOA, a Historic Preservation Overlay Zone, or a hillside-specific zoning overlay.
What it costs in Hollywood
Zoning and HOA compliance work in Hollywood runs $2,000-$5,000, including setback variance documentation where the lot is nonconforming.
How we do it
We research the overlay, draft the compatibility findings, and route the package through the city or HOA review path that governs your block.
Title 24 Energy Compliance
Signs you need it
The building department has flagged your ADU for Title 24 energy calculations and you have no compliance model in hand.
What it costs in Hollywood
Title 24 compliance documentation in Hollywood runs $500-$2,000, depending on window-to-wall ratio and HVAC selection.
How we do it
We run the energy model, adjust the window and insulation spec to pass, and file the certificate with the permit set.
What ADU Design & Permitting Costs in Hollywood
| Item | Typical range in Hollywood |
|---|---|
| Site assessment with slab check | $1,000-$3,000 |
| Architectural blueprints | $8,000-$20,000 |
| Permit application and city coordination | $3,000-$8,000 |
How long does ADU permitting take in Hollywood?
Flatland garage conversions in Hollywood typically clear the city in 4-8 months. Hillside projects inside the Very High Fire Hazard Severity Zone often take 9-14 months because fire-hardening review adds a full round of comments. Call (971) 497-2402 for a written timeline on your specific lot.
Will an HPOZ block my Hollywood ADU?
HPOZ review in Hollywood applies to visible exterior changes, not interior conversions. A garage conversion that keeps the original street-facing facade usually passes; a new detached ADU must clear visual-compatibility review. Call (971) 497-2402 to find out which overlay governs your block.
Junior ADU & Interior Conversion in Hollywood
A Junior ADU in Hollywood is typically a 450-500 square foot interior conversion carved from an existing bedroom wing, finished attic, or underused den. In the 1920s bungalows of the flatlands, the interior JADU path often avoids HPOZ exterior review and fire-zone framing entirely, because the shell already exists. Our Junior ADU & Interior Conversion service draws the unit inside the existing envelope, which is why so many Hollywood homeowners price it before they price a new build.
Room-to-ADU Conversion
Signs you need it
You have a primary bedroom wing or oversized den with separate exterior access and want rentable square footage without a new foundation.
What it costs in Hollywood
A room-to-ADU conversion in Hollywood runs $65,000-$125,000, kitchenette and separate entrance included.
How we do it
We lock the scope under Haven Standard Clause 1, frame the kitchenette wall, run plumbing and electrical, and install the required separate entrance.
Interior JADU
Signs you need it
You want an attached unit under 500 square feet with its own bath and kitchen, sharing the main house’s water and power.
What it costs in Hollywood
A Junior ADU in Hollywood runs $80,000-$150,000, with under-slab plumbing and panel work priced line by line.
How we do it
We file the JADU permit path, run the mechanicals, and complete the interior build without touching the exterior envelope.
What Junior ADU & Interior Conversion Costs in Hollywood
| Item | Typical range in Hollywood |
|---|---|
| Room-to-ADU conversion | $65,000-$125,000 |
| Interior JADU | $80,000-$150,000 |
| Added bedroom suite (attached) | $45,000-$95,000 |
Does a Junior ADU need separate utility meters in Hollywood?
No. JADUs in Hollywood may share water, sewer, and electrical service with the main house, which is one reason they pencil out faster than detached units. Call (971) 497-2402 to run the numbers on your specific floor plan.
Will my lath-and-plaster walls handle an interior conversion?
Yes, but Hollywood bungalow interiors often have original lath-and-plaster that must be opened carefully to run new electrical and plumbing. We document the existing condition in the photo record before demo begins. Call (971) 497-2402 for a walkthrough of what your walls can carry.
ADU Site Prep & Utilities in Hollywood
In Hollywood, site prep and utilities is where flatland and hillside projects diverge most sharply. A flatlands garage conversion may need nothing more than a sewer lateral connection and a 100-amp subpanel. A hillside ADU on a cut-and-fill lot will trigger grading permits, geotechnical review, and possibly a retaining wall before the first footing goes in. Our ADU Site Prep & Utilities service handles both scenarios under the same written-price rule: the scope is locked at signing, and the photo record documents every trench and panel as it is opened.
Foundation & Grading
Signs you need it
Your Hollywood garage slab has no perimeter footing, or your hillside lot needs cut-and-fill work before any structure can be placed.
What it costs in Hollywood
Stem-wall underpinning for a floating slab garage in Hollywood runs $15,000-$25,000; full hillside grading and foundation work runs $40,000-$100,000.
How we do it
We verify the bearing condition, pour the stem wall or footings, and pull the geotechnical and grading permits the city requires before the slab is placed.
Electrical Panel Upgrade
Signs you need it
Your Hollywood bungalow still has a 60-amp panel or original armored-cable wiring that cannot support a second dwelling unit.
What it costs in Hollywood
A panel upgrade to 200 amps in Hollywood runs $3,500-$7,500, including the service lateral from the alley or street.
How we do it
We coordinate the LADWP service disconnect, swap the panel, and run the subpanel feed to the ADU location.
Plumbing Lateral
Signs you need it
Your ADU needs a sewer connection, and the existing clay lateral under the alley is cracked or shallow.
What it costs in Hollywood
A new sewer lateral from the ADU to the city main in Hollywood runs $8,000-$18,000, depending on alley depth and pipe run.
How we do it
We locate the existing lateral, trench to the city cleanout, and lay the new line with a documented photo record before backfill.
What ADU Site Prep & Utilities Costs in Hollywood
| Item | Typical range in Hollywood |
|---|---|
| Stem-wall underpinning (garage slab) | $15,000-$25,000 |
| Hillside grading and foundation | $40,000-$100,000 |
| Electric panel upgrade to 200A | $3,500-$7,500 |
Will the price change once the trench is open in Hollywood?
No, under Haven Standard Clause 5 (No Surprises), the scope is locked at signing. If the trench reveals an undocumented pipe, we document it, price the change in writing, and get your sign-off before proceeding. Call (971) 497-2402 for a written site-prep estimate.
Do I need a geotechnical report for a flatlands Hollywood garage ADU?
Usually not in the flats, where the city accepts the existing slab with a bearing check. Hillside lots above Franklin almost always require geotechnical review because the original grading predates current code. Call (971) 497-2402 to confirm which path applies to your parcel.
Brands We Service in Hollywood
We specify and coordinate prefab and modular systems from Cover, Dvele, and Mighty Buildings within the same single contract that covers design, permits, and construction. Parts and panel schedules are ordered to the project site in Hollywood, not drop-shipped. See our brands for the full list and ordering lead times.
Pricing for ADU in Hollywood, CA
| Service | Typical range in Hollywood |
|---|---|
| Site assessment with slab check | $1,000-$3,000 |
| Architectural blueprints | $8,000-$20,000 |
| Permit application and city coordination | $3,000-$8,000 |
| Room-to-ADU conversion | $65,000-$125,000 |
| Interior JADU | $80,000-$150,000 |
| Added bedroom suite (attached) | $45,000-$95,000 |
| Stem-wall underpinning (garage slab) | $15,000-$25,000 |
| Hillside grading and foundation | $40,000-$100,000 |
| Electric panel upgrade to 200A | $3,500-$7,500 |
| Sewer lateral replacement | $8,000-$18,000 |
| Gas line extension | $2,000-$6,000 |
What pushes a Hollywood ADU price up is almost always the land, not the building: a floating slab that needs underpinning, a hillside that needs grading, an HPOZ facade that needs matching, or a fire zone that needs Class A assemblies. Every project we price gets a written line-item quote before any work starts, no exceptions.
Neighborhoods We Serve in Hollywood
We work across Hollywood’s flatlands and hills, from the alley-grid bungalow courts south of Santa Monica Blvd up through the fire-zone parcels above Franklin. Response time for a site assessment in Hollywood is typically 3-5 business days.
- Hollywood Flatlands
- Melrose Hill
- Whitley Heights
- Beachwood Canyon
- Hollywood Hills
Service Area - Cities Near Hollywood
Our Hollywood crews also coordinate work in nearby metro areas, including Los Angeles, CA, San Diego, CA, San Jose, CA, and San Francisco, CA. Scheduling is coordinated from our Los Angeles office, with crews dispatched locally to each site.
Serving Hollywood, CA - Our Local Coverage Area
We’re based in the 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 Hollywood
Design and permitting typically begin within two weeks of a signed contract, once the site assessment is complete. Full construction start depends on the city’s permit review timeline, which runs 4-8 months in the flats and 9-14 months in the hills. Call (971) 497-2402 for a written schedule tied to your address.
If your home sits inside a registered HOA or an HPOZ like Melrose Hill, exterior changes require review. Interior JADUs and garage conversions that keep the street-facing facade unchanged usually clear faster. Call (971) 497-2402 to check which overlay governs your block.
Yes. We work from the flatlands below Franklin Avenue up through Beachwood Canyon and the Hollywood Hills, including all parcels inside the Very High Fire Hazard Severity Zone. Call (971) 497-2402 to confirm your address is in our service area.
Call Ellery ADU Studio at (971) 497-2402 to schedule your free written estimate. Every Hollywood ADU project starts with a documented site assessment and a line-item price on paper, not a phone quote.
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 Hollywood Customers Say
"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."Handled the whole planning process. We went to one hearing and that was it."
- Rowena C.