Hills & Canyons · FAQ
Hills & Canyons ADU questions, answered
Questions we get on almost every Hills & Canyons site walk. If yours isn't here, ask us — we answer everything before you commit.
Does the Baseline Hillside Ordinance kill my ADU?
Almost never. State ADU law overrides local FAR limits up to 800 sqft, and many hillside lots can fit a full 1,200 sqft attached ADU even under BHO.
How much does hillside geotech add?
Plan on $8–25k for the report itself. The downstream cost — caissons, retaining walls, deeper foundations — is where the real budget impact lives.
What's the haul-route permit?
HCR (Hillside Construction Regulation) limits truck size and operating hours on hillside streets. We file the haul-route permit alongside the building permit, not after.
Do I need Director's review on Mulholland?
Only if your parcel is inside the Mulholland Specific Plan corridor. If it is, expect 6–12 weeks of additional review before LADBS will accept the package.
Can I do a basement ADU on a downslope lot?
Often the cleanest option — lower retaining cost, hidden from street, and counts as a conversion under state law if the existing structure already has the basement.
Foreman's notebook · Hills & Canyons
What we know walking onto a Hills & Canyons lot
- From Mid-City yard
- 22 min
- Jobs finished here
- 14
- Build window
- Late April–early November. Wet-weather grading bans hit hard.
Today's daylight window
Sunrise
5:52 AM
Golden hour
7:31 PM
Sunset
8:07 PM
Day length
14h 15m
Permit counter
LADBS — Metro Office
201 N Figueroa St, Los Angeles, CA 90012
Phone
(213) 482-0000
Hours
Mon–Fri 7:30am–4:30pm
Our typical wait: 12–16 weeks (HCR adds time)
Site
Steep + decomposed granite. Drilled piers on caissons; never spread footings on slope.
Crane / staging
Mini-crane + boom pump. Crane lifts need 72hr neighbor notice in HCR.
Crew spot
Bricks & Scones — Larchmont
City dossier · the 20 things we track
- Locals call it
- The Hills
- Architectural DNA
- Hillside modern · post-and-beam · cantilevered glass
- Our signature spec
- Steel moment frame · charred cedar · Class A standing-seam
- Fire hazard zone
- VHFHSZ (very high)
- Nearest fault
- Hollywood Fault · 0.6 mi
- Title 24 climate zone
- Title 24 Zone 9
- Median lot
- 7,800 sf
- Typical setbacks
- 5ft side · 15ft rear · slope-adjusted
- New 1BR ADU rents
- $3,600–$4,400 /mo
- Resale lift w/ ADU
- +7–11%
- Iconic landmark
- Hollywood Sign · 2.2 mi
- Street sweeping
- Mon (limited routes)
- Trash / dumpster day
- Friday (LASAN)
- Solar yield
- 1,750 kWh / kW · yr
- Avg summer high
- 88°F
- Avg winter low
- 48°F
- Lots inside an HOA
- 3%
- Nearest ER
- Cedars-Sinai Medical Center
- Jobsite radio
- KCRW Morning Becomes Eclectic
- Protected trees
- Coast live oak · sycamore · all ridge-line trees
- Crew lunch spot
- Greenblatt's-style at Joan's on Third
10 things we already know about this area
- HCR district covers nearly all of Hollywood Hills west — haul route required.
- Most lots > 25% grade — caissons standard, not optional.
- Mulholland Specific Plan view corridors get appealed if you go above the ridge.
- VHFHSZ everywhere — Chapter 7A, ember-resistant vents, defensible space.
- Driveway widths often 9ft — mini-crane mandatory.
- Geotech reports run $8–15k and 4–6 weeks before drafting.
- Septic systems on some streets — engineered alternative system if upgrading.
- Beachwood Canyon Sign Overlay restricts roof reflectivity — matte finishes only.
- Crane swings over a neighbor need their signed letter, not just notification.
- Concrete trucks need a 12% grade limit — sometimes 2 trucks shuttle to a pump.
Material yards we call here
- Anawalt Lumber — Hollywood · lumber
- Robertson's Ready Mix (Burbank yard) · concrete
- United Rentals — Hollywood · rental
Recent jobs
- Lookout Mountain Ave · Hillside detached studio
510sf · 30 weeks · 6 mo ago - Outpost Dr · Stacked JADU + view deck
640sf · 26 weeks · 11 mo ago
"Hills jobs live or die on the geotech. We never quote until the report is in our hands."
28 things we track for every Hills & Canyons job
What changes when the lot is in Hills & Canyons
Same plans drawn three miles apart can cost $80k different. These are the local conditions, ordinances, soils, utilities, and crew realities that decide the number. We update this from our own jobs and the city counter.
Regulation & permits
- Noise / construction hours
- Mon–Sat 7a–8p · LAMC · hillside neighbors complain fast = HCRC enforcement
- Historic overlay
- Whitley Heights HPOZ · Outpost Estates · Hollywood Heights · Mills Act gold
- Parking / dumpster permit
- LADOT + flagger required on >12% grade · $400+ daily traffic plan · helicopter for big steel
- Demo diversion mandate
- 65% LAMC · hillside haul restrictions: dirt-only haul route bond required
- School impact fees
- LAUSD: $4.79/sf · BHUSD if in 90210: $4.79/sf + city add-on
- Prop 13 reassessment
- Major remodel >50% = potential full reassessment · keep one wall standing rule
- Zoning trajectory
- BMO/BHO caps massing · Methane zone in Hollywood foothills · HCR limits FAR
- ADU pre-approved plans
- Not viable on slopes >15% · custom geotech required · use Standard Plan only on flats
Site & geology
- Soil type
- Modelo shale / Topanga sandstone — fractured, anisotropic · landslide-prone overlays
- Water table
- Variable — perched water on bedding planes · French drains mandatory
- Foundation pier depth
- 14–28 ft caissons + grade beams · steel moment frame standard · geotech mandatory
- Subsurface conflicts
- Methane zones (Salt Lake oil field) · DOGGR check + venting on Hollywood foothills mandatory
- Wildlife / habitat mitigation
- P-22 mountain lion corridor (now retired) · raptor nests · oak/sycamore protection
- Seasonal risks
- Mudslides Dec–Mar · Santa Ana fire Sep–Jan (PSPS) · rain stops all grading
- Street / delivery access
- Single-lane hairpins · no semi-truck · 10-yd max dump truck · concrete via line-pump only
- Airport / flight-path noise
- BUR + LAX north contour · helicopter traffic (LAPD + tourist) constant
Utilities & energy
- Utility upgrade wait
- LADWP 200A: 16–24 wk hillside · transformer access often needs helicopter ($18k)
- Seismic retrofit history
- ~22% (most are post-1980 cantilevers, not soft-story) · hillside ordinance retro 2018+
- NEM 3.0 / solar export
- Solar OK but tree canopy reduces yield 30% · battery essential for PSPS
- Pool permit reality
- Engineered shell, geotech, 60-day permit cycle · infinity edge = +$80–140k
Culture & crew
- Local salvage / reclaimed
- Olde Good Things (Atwater), Pasadena Architectural Salvage, Big Daddy's Antiques
- Color / palette rules
- BHO: muted earth tones · no white reflective on ridgeline (BHO 12.21.A.17)
- Theft risk on jobsite
- Copper from estates · construction tools low (gated) · package theft high
- Sub-contractor ecosystem
- Strong: caisson, structural steel, sheer-pile · weak: budget framers won't bid
- Tree protection fines
- Protected tree: $25k+ + 4:1 box · oak fines aggressively prosecuted · ISA arborist on file
- Jobsite language
- Spanish + English · Russian on some Beverly Hills jobs · architect-driven communication
Money & momentum
- Top cost surprises
- Geotech + soils ($18–35k) · caissons ($45–120k) · haul-route bond ($25k+)
- Permit boom indicator
- Hillside permit cycle 32–48 wk · geotech + grading drives carrying cost
Sources: city counter notes, our own permit logs, CalRecycle, CA Title 24, DOGGR, CAL FIRE FHSZ, USGS Q-Fault, PG&E / SCE / LADWP rate sheets, school district fee schedules. Last reviewed by our PMs this quarter.
Faq in La Hills: we'll cost yours from comparable jobs on your zip.
- Pulled from real La Hills permits in the last 18 months
- No 'national average' nonsense
- We hand you the comparable addresses
Free · 48-hour turnaround