ADU Constructionin Rancho Palos Verdes, CA
You can build an ADU in Rancho Palos Verdes, but the local rules are in flux. The State's housing department found the City's ordinance non-compliant on September 8, 2026, and the City plans to amend it by about February 2027. Until then, applications are reviewed under state law. The Portuguese Bend landslide area bans new homes, additions and garages.
Frank Vanderlip bought the 16,000 acre Peninsula in 1913 for a planned residential colony, and Great Lakes Carbon bought 7,000 acres from his family in July 1953 and turned to a development master plan. Homes followed fast: the Housing Element puts the peak of building at 1950 to 1980, and the 2024 American Community Survey five-year estimates count 16,723 homes, 84.2 percent built before 1980, with a median year built of 1967. Only 155 units were added between 2010 and 2020, so an ADU is a rare kind of new construction here.
This page sets out which rulebook applies today, which size and height numbers are only draft, the landslide-area ban, the fire and geology reviews, the City's submittal path and fees, and the coastal, association and rental rules. The City's Municipal Code was not read for this page and no code mirror was used, so every Chapter 17.10 and 15.20 reference is as the City's own handouts, checklist and agenda report quote it. Costs and the phase timeline are on our ADU construction page, and the Rancho Palos Verdes overview lists every trade we manage in town.
What Rancho Palos Verdes says about ADUs, and what the State told the City
Where adu construction permits come from in Rancho Palos Verdes: City of Rancho Palos Verdes Community Development Department, Building & Safety Division.
- The City's ADU page says ADUs are allowed on lots zoned for single-family or multifamily residential use and JADUs only on single-family lots, a JADU is at most 500 square feet inside the primary residence, and the standards are in Chapter 17.10 of the Municipal Code plus Title 24. The Planning Division line is (310) 544-5228, planning@rpvca.gov.
- The City's pre-approved standard ADU plan program (based on AB 1332) applies only to new, detached, state-exemption ADUs and the plan catalog was 'to be posted soon'; no pre-approved plans were listed. The page also lists the City's ADU & JADU Development Submittal Checklist and a South Bay Cities COG ADU budgeting calculator.
- On September 8, 2026 the State Department of Housing and Community Development (HCD) wrote that Ordinance 681 (RPV's ADU ordinance, adopted June 18, 2024) does not comply with State ADU law, citing 19 findings, and the City told HCD on September 23, 2026 that it will amend Chapter 17.10. The City Council was to consider initiating the amendment on October 6, 2026, a Planning Commission hearing is expected December 2026 or January 2027 and adoption by February 2027, so the local ADU rules are in flux.
- HCD's findings quote the adopted ordinance: one ADU and one JADU on a single-family lot; attached ADU capped at the lesser of 50 percent of the primary residence (including garage), 850 square feet for one bedroom or 1,000 square feet for more than one bedroom; objective architectural standards (matching colors, finishes and roof pitch, garage door removal where feasible, privacy measures); ADUs placed behind the house unless an 800 square foot unit cannot fit; a 60-day ministerial review; and a recorded use covenant. HCD says several of these conflict with State law (for example the covenant, the size caps for state-exemption units and the 60-day versus 15 business day completeness notice).
- HCD's letter and the City's reply confirm that until the code is amended the City will review ADU applications in compliance with State ADU law, which allows, on a lot with a single-family home, a JADU and a conversion ADU inside the home or an accessory structure plus one new detached ADU of up to 800 square feet with 4 foot side and rear setbacks, and (after SB 543, effective January 1, 2026) any combination of those, and up to 8 detached ADUs on an existing multifamily lot.
- The City posted a draft Chapter 17.10 last updated April 29, 2024, and the City's October 2026 agenda report says Ordinance 681 (adopted June 18, 2024) is its current ADU ordinance; HCD's quotations of Ordinance 681 match the draft's wording. Under the draft a detached ADU is capped at 850 square feet (1,000 if more than one bedroom) and 16 feet high (18 feet near major transit or on a multifamily multi-story lot, plus 2 feet to match the main roof pitch), with no setback for conversions and 4 feet side and rear otherwise.
- Draft Chapter 17.10 parking: one space (may be enclosed) for the ADU, with no space required within one-half mile walking distance of transit, when the ADU is part of the primary residence, when a garage is converted or demolished, or when a car share is within one block; parking may be in setbacks or tandem unless the City finds it not feasible for topographic or fire and life safety reasons.
- Draft Chapter 17.10 also says: lots in the very high fire hazard severity zone must include mitigation measures per California Building Code Chapter 7A; no roof decks on detached ADUs; ADUs may not be used for storage, home office, gym or events; short-term rental is prohibited (RPVMC 17.02.026); ADUs follow the grading permit rules in 17.76.040 but ministerially; a new ADU cannot be converted to primary dwelling space for 20 years; and setbacks are reviewed for fire safety as the County Fire Department may determine.
Sources for these rules
Can you build an ADU in Rancho Palos Verdes while the State says the ordinance does not comply?
Yes. Ordinance 681, adopted June 18, 2024, is still the adopted text and the City's current ADU law, according to its October 2026 agenda report. On September 8, 2026, the State Department of Housing and Community Development wrote that it does not comply with State ADU law and listed 19 findings, among them the recorded use covenant, the size caps on state-exemption units and a 60 day review period set against the State's 15 business day completeness notice.
The City answered on September 23, 2026 that it will amend Chapter 17.10, and in the meantime it will review ADU applications under State law. The October 2026 agenda report says the Council was to consider starting the amendment on October 6, 2026. We did not find the minutes, so we cannot say what it decided. A Planning Commission hearing is expected in December 2026 or January 2027 and adoption by February 2027. A permit applied for this winter may meet rules that are about to change, so a written scope should name the application date and the rulebook used.
How big, how tall and how close to the fence can a Rancho Palos Verdes ADU be?
Start with state law, because it sets the floor. On a lot with a single-family home, the State protects a conversion ADU and a JADU plus one new detached ADU of up to 800 square feet with 4 foot side and rear setbacks, and, since January 1, 2026 (SB 543), any combination of those. A city may not cap a detached unit below 850 square feet, or 1,000 for more than one bedroom. A multifamily lot can add up to 8 detached units. The statute is is in Government Code sections 66310 to 66342.
The local numbers below come from the City's draft Chapter 17.10, last updated April 29, 2024, because the adopted text was not available to us. HCD's quotations of the adopted ordinance match the draft's wording for attached units, but HCD does not quote the detached figures, so ask Planning. The draft caps a detached ADU at 850 square feet (1,000 with more than one bedroom) and 16 feet high, or 18 feet near major transit or on a multifamily lot with multi-story buildings, plus 2 feet to match the main roof pitch. Conversions need no setback.
The draft asks for one parking space, with none within one-half mile walking distance of transit, when the ADU is part of the house, when a garage is converted or demolished, or with a car share within a block. Setback or tandem parking is allowed unless topography or fire safety makes it infeasible. Detached ADUs get no roof deck.
Can I build an ADU inside the Portuguese Bend landslide area?
Ask Planning before drawing anything. The City's landslide regulations cover about 715 acres of the mapped ancient complex. Ordinance 692, adopted August 19, 2025 and permanent since September 18, 2025 (Municipal Code Chapter 15.20), bars new residential structures, additions, new garages, some accessory structures and new or repaired pools. The City's page does not mention ADUs by name. Whether a State-protected unit can be refused on such a lot is a legal question we did not research, and the answer for an address starts with Planning at (310) 544-5228.
What the City does allow is replacement, restoration or repair inside the existing footprint, with the same square footage, stories and setbacks in the same general location, under a Landslide Exception Permit with geology approval and a trust deposit of at least $2,000. Minor sheds of 320 square feet or less, non-remedial grading up to 50 cubic yards and maintenance are also allowed. Urgency Ordinance 687U permits temporary stabilization and modular housing through December 31, 2026 unless the Council extends it.
Does the fire zone change a Rancho Palos Verdes garage conversion or detached ADU?
The City's permit application states that the entire city is a Very High Fire Severity Zone under Government Code 51177 and that every Very High zone requirement applies. The County's copy of the State fire map tells a narrower story: 73 of 213 land sample points (34.3 percent) were Very High, with the rest High, Moderate or Non-Wildland. Those are sample points, not a parcel map, and the City's designation governs permits, so ask Building & Safety about an address.
The City's ADU checklist requires Los Angeles County Fire approval for any new habitable space, starting with a Cal Water fire flow test that decides whether sprinklers or a new hydrant, at the owner's expense, are needed. State law says an ADU need not have sprinklers when the main house does not, and we have not seen the City or the County explain how the fire flow test fits that rule, so ask both. The draft chapter also requires Chapter 7A hardening measures in a Very High zone. About 40 percent of the city's homes sit on roads with a single direct access.
Converting a detached structure, or building a habitable accessory building over 500 square feet, needs the City Geologist's Category 1 visit ($503) and sometimes a soils report. A garage conversion needs no replacement parking under State law, and the draft chapter says the same.
What does the City's ADU submittal need, and what do the fees look like?
The City's 2026 ADU and JADU checklist asks for a Major Site Plan Review application to Planning and a plan check application to Building & Safety, with a stamped land survey, topography marking slopes of 35 percent or more and the distance to any slope of 50 percent or more, stamped grading and drainage plans where soil moves, structural calculations and a soils report where required. Outside approvals include Los Angeles County Sanitation Districts receipt for a sewer connection, County Public Health approval for a septic tank, and an AQMD asbestos report if a load-bearing wall is removed or an opening widened.
The fiscal 2026-27 fee schedule prints building inspection at $2.38 per square foot for an ADU conversion and $1.77 per square foot for a new or added ADU, so 600 square feet of new unit is $1,062 on that line. Geology reviews are $503 for Category 1 and $1,860 for a submitted report. Planning and plan check amounts did not read cleanly from the PDF, so we print none. School fees to the Palos Verdes or Los Angeles Unified district apply to added habitable space, and State law exempts an ADU of 750 square feet or less from impact fees but not from utility connection charges.
The City's pre-approved plan program covers only new, detached, state-exemption ADUs, and its catalog was listed as to be posted soon with no plans in it. If the unit uses an on-site wastewater system, the draft chapter requires a percolation test within five years and County approval before the permit issues.
What do the Coastal Zone, associations and rental rules mean for a Rancho Palos Verdes ADU?
Seaward of Palos Verdes Drive West and South, the City's certified Local Coastal Program applies and most new development needs a Coastal Permit. State law requires the City or the Coastal Commission to act on an ADU's coastal permit within 60 days, alongside the building review. The coastal setback line and its geologic studies still apply on the bluff top, where the General Plan puts typical cliff retreat near 6 inches a year.
Associations cannot simply say no. The State's ADU handbook says Civil Code sections 4751 and 714.3 void CC&Rs that effectively prohibit or unreasonably restrict an ADU or JADU on lots zoned single-family, and AB 130 bars fees or financial requirements inside reasonable restrictions. The City does not enforce CC&Rs and warns that a permit does not override an HOA, so get the association's letter early. On use, State law lets a city require rentals of 30 days or longer and does not require owner occupancy for an ADU. The draft chapter bans short-term rental under RPVMC 17.02.026 and bars storage, a home office, a gym or events in the unit.
ADU details from Rancho Palos Verdes-area projects
Framing, utility and interior details from ADU and garage conversion projects in Rancho Palos Verdes and nearby South Bay communities. Tap a photo to enlarge it.
What adu construction costs around Rancho Palos Verdes
For planning, our ADU construction page uses $100,000 to $200,000 for turning a garage into a studio or one-bedroom and $200,000 to $400,000 for a new detached unit of 400 to 800 square feet, with medium to low confidence. Three studies sit behind that: a UC Berkeley survey of 2018 and 2019 projects that found a Los Angeles County median of $100,000, a Terner Center figure of $148,000 for Los Angeles, and Remodeling magazine's 2025 Cost vs. Value report, which shows a $178,536 job recouping 39.9 percent at resale. None of them priced a Rancho Palos Verdes hillside lot, so the geology report, grading, fire flow upgrades and any septic work should be read as separate lines in a written proposal. Our ADU cost guide shows each source, and the post on ADU versus JADU explains the 500 square foot unit. Neighbors apply the same state law in their own ways, so compare Torrance, Redondo Beach and Los Angeles. A family that wants space inside the house can weigh a room addition here, and a bath in the unit follows bathroom remodeling in town.
| What it covers | Typical range |
|---|---|
| Garage conversion to a studio or one bedroom | $100,000 to $200,000 |
| New detached ADU, 400 to 800 sq ft | $200,000 to $400,000 |
| UC Berkeley survey, Los Angeles County median, 2018 and 2019 projects | $100,000 overall. $90,000 garage. $180,000 detached. |
| Terner Center and Berkeley CCI, 2020 | $148,000 Los Angeles estimate. $167,000 statewide average. |
| Remodeling Cost vs. Value 2025, Los Angeles | $178,536 job cost |
| Electrical and plumbing, Angi Los Angeles, January 2026 | Electrical $2,600 to $7,800. plumbing $3,900 to $10,400. |
| City permit and plan check fees | Not priced here |
Other work we manage in Rancho Palos Verdes
Rancho Palos Verdes ADU size, permit, cost and rental questions
How big can an ADU be in California?
State law lets a city cap a detached ADU no lower than 850 square feet, or 1,000 with more than one bedroom, and requires an 800 square foot unit with 4 foot setbacks. Rancho Palos Verdes' draft chapter uses 850 and 1,000, but that is draft text, so ask Planning at (310) 544-5228.
Do I need a permit to build an ADU in Rancho Palos Verdes?
Yes. The City's checklist asks for a Major Site Plan Review application to Planning and a plan check application to Building & Safety, plus Los Angeles County Fire approval for new habitable space. A geology review comes first for detached conversions and habitable accessory buildings over 500 square feet.
How long does it take to get an ADU permit?
State law gives an agency 15 business days to call an application complete and 60 days after that to act, or it is deemed approved. Rancho Palos Verdes' ordinance also uses a 60 day review. We found no published City processing time, and geology, fire flow and the pending code amendment can add weeks.
How much does it cost to build an ADU in California?
Our regional ranges are about $100,000 to $200,000 for a garage conversion and $200,000 to $400,000 for a new detached ADU of 400 to 800 square feet, at medium to low confidence. No Rancho Palos Verdes study turned up, and hillside geology, grading and fire upgrades are separate lines.
Can I build an ADU on a lot inside the Portuguese Bend landslide area?
Ask Planning first. The City's landslide ordinance bars new homes, additions and garages across about 715 acres and allows replacement inside the existing footprint. Its page does not mention ADUs by name, so eligibility for a given address is a question for Planning at (310) 544-5228.
Can I convert my garage to an ADU, and do I have to replace the parking?
Yes to the conversion, and no to replacement parking. State law and the City's draft chapter both waive a parking space when a garage is converted or demolished. The City's fire flow test, County Fire approval, geology review for detached garages and an AQMD report for widened openings still apply.
What is the difference between an ADU and a JADU?
A JADU is capped at 500 square feet and built inside the walls of the house, including an attached garage, with a separate entrance and an efficiency kitchen. An ADU can be attached, detached or converted and has a full kitchen and bath. The draft chapter adds a recorded deed restriction for a JADU.
Can I rent my ADU on Airbnb?
No under the City's draft chapter, which prohibits short-term rental of an ADU under RPVMC 17.02.026. State law lets a city require rentals of 30 days or longer. Owner occupancy is not required for an ADU. Check the adopted text with Planning, because the chapter is due to be amended.
Does Rancho Palos Verdes have pre-approved ADU plans?
Not yet in the pages we read. The City's program, based on AB 1332, applies only to new, detached, state-exemption ADUs, and the catalog was listed as to be posted soon with no plans in it.
Can my HOA stop me from building an ADU?
Not outright. The State's ADU handbook says Civil Code sections 4751 and 714.3 void CC&Rs that effectively prohibit or unreasonably restrict an ADU or JADU on single-family lots. The City does not enforce CC&Rs and says a permit does not override an HOA, so get the board's letter before you file.
Describe your Rancho Palos Verdes ADU idea
Tell us whether you picture a garage conversion, a detached unit or a JADU, the street or neighborhood, whether the lot slopes or sits near the landslide area, and the year the house was built, and we will plan the first visit around those answers.