ADU Builder & Home Additions in Rolling Hills Estates, CA
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Last modified: 2026-09-24T00:00:00.000Z
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Image: Detached backyard ADU with wood siding and black-framed glass doors at dusk
- Rolling Hills Estates
Design · Permit · Build
ADUs & Additions in Rolling Hills Estates
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for Rolling Hills Estates Homes
Rolling Hills Estates, one of four cities on the Palos Verdes Peninsula, is known first for its equestrian character: streets curve with the hillsides, most end in cul-de-sacs, and bridle trails edged in white three-rail fence pass behind the houses.
In Dapplegray Lanes the homes sit close to the street so corrals and stables can use the back of narrow lots, while in Los Ranchos Verdes and Ranchview houses crown the hilltops and the trails keep to the valleys below. That pattern shapes a backyard more than any trend does: on H district lots the code reserves room for a future horse-keeping area and keeps a pool at least ten feet from it, and pools, spas and patios count toward a firm lot coverage cap.
Grading beyond three feet of cut or fill, other than the pool excavation itself, goes to the Planning Commission, so the site plan is settled with those limits in view from the first sketch.
Single-family zones set minimum lots of one acre in R-A-E, 20,000 square feet in R-A-20, 15,000 in R-A-15 and 10,000 in R-A-10, on curving streets that follow the hillsides and mostly end in cul-de-sacs. Pools, spas, patios and decking count at 75 percent of their area toward a lot coverage cap of 25 percent in R-A-E, 30 percent in R-A-20 and R-A-15, and 35 percent in R-A-10, so coverage is often the first number a backyard plan is checked against.
We are a design-build team, which means the people who draw your project are the people who build it. Design, engineering, permits and construction run through one project manager and our own crews, so nothing gets lost in a handoff between a salesperson and a subcontractor. We are licensed, bonded and insured, CSLB license #1119054 .
Permits in Rolling Hills Estates: Rolling Hills Estates is a contract city: its Building and Safety Division, part of Community Development at City Hall on Palos Verdes Drive North, uses Willdan for building and safety services, and application materials go to Willdan for building review only after Planning has approved the project.
For ADUs and small additions, the city's submittal list asks for fully dimensioned plans showing existing and proposed lot coverage, plus one set signed by the homeowners association and the adjacent neighbors. Title 17 requires Planning Director grading approval for cut or fill between one and three feet deep or ten to twenty cubic yards of import or export, and Planning Commission approval beyond three feet, beyond twenty cubic yards or on any slope of 35 percent or more, although excavation for a swimming pool under a valid building permit is exempt.
On lots in the H (horse) district, no permit may be issued that would rule out a future horse-keeping area of at least 800 square feet, set 35 feet from any dwelling on or off the lot and ten feet from a swimming pool, with a limited exception for legally built homes that cannot fit one until they are substantially expanded or rebuilt.
Permit details checked September 2026 against Rolling Hills Estates Municipal Code . Rules change, so we confirm them again for your parcel.
What We Build
- Horse-keeping area preservation on H district lots
- Lot coverage planning for pools and hardscape
- Planning Commission grading approval
- HOA and neighbor plan signatures for ADUs
- Geotechnical design for expansive clay and landslide areas
- Detached ADUs, ground-up
- Garage conversions to living space
- Junior ADUs within the main house
- Room additions and bump-outs
- Second-story additions
- Full kitchens and bathrooms in the ADU
- Separate utility metering where required
- Private entries, patios and landscaping
- Plans, engineering and city submittals
- Title 24 energy compliance
Local Conditions
What to Know in Rolling Hills Estates
These local conditions change the scope, the schedule and the budget.
01
The General Plan Safety Element maps more than 1,200 acres of the planning area as Altamont Clay Loam, Diablo Clay Loam and Montezuma Clay Adobe, expansive clay soils with a high shrink-swell potential, so pool shells, slabs and footings are best designed from a site soils report.
02
The Safety Element describes a modeled Silver Spur Landslide Complex whose potentially active slip surface underlies a large portion of the residential area northeast of the Peninsula Center, and state seismic hazard mapping places areas behind Little Silver Spur Road, between Deep Valley Drive and Crenshaw Boulevard, and along the south side of Indian Peak Road in earthquake-induced landslide areas, so geotechnical review comes before pool or retaining wall design.
03
The Safety Element notes that wildfire poses a particular hazard to properties built on or next to canyons and steep hillsides, and it records a 1973 fire in the planning area that burned 925 acres and destroyed 12 homes. Fire protection is provided under contract by the Los Angeles County Fire Department, which enforces fuel modification on parcels in a Very High Fire Hazard Severity Zone, so a parcel's current zone is confirmed before decking and planting are chosen.
04
Bridle trails run along roads, through parks and valleys and behind houses, marked by white three-rail fences, and where a lot carries a bridle trail easement the code requires a yard of at least seven feet between the nearest building eave and the easement.
Areas we serve in Rolling Hills Estates:Dapplegray LanesRollingwoodLos Ranchos VerdesRanchviewMasongateThe Ranch
Investment
What It Costs in Rolling Hills Estates
Real Southern California price ranges, not teaser numbers.
Detached ADU
$150,000 to $400,000+
What moves it: square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build
Garage conversion ADU
$80,000 to $180,000
What moves it: whether the existing slab and framing meet current code, how far utilities have to run, and the finish level of the kitchen and bathroom
Plans, drawings and permit management
$4,500 to $25,000+
What moves it: project type and size, whether structural engineering, Title 24 or a soils report is required, and how many jurisdictions or review bodies are involved
Your lot, access and finishes set the price. We walk the site, then show you where every dollar goes.
Get a line-item price for your Rolling Hills Estates property
The Process
How We Work in Rolling Hills Estates
01
Feasibility
We check lot size, setbacks, utilities and access to confirm what your property will actually support.
02
Design & 3D
Layout, elevations and finishes, modeled in 3D so you approve the unit before submittal.
03
Plans & Permits
We prepare the full drawing set, handle engineering and Title 24, and manage the city submittal and corrections. In Rolling Hills Estates that submittal goes to City of Rolling Hills Estates Community Development Department, Building and Safety Division.
04
Foundation & Framing
Site prep, foundation, framing and dry-in by our own crews.
05
Systems & Finishes
Electrical, plumbing, HVAC, insulation, then kitchen, bath and interior finishes.
06
Final Inspection
We pass final inspection, walk the unit with you and hand over the keys.
Questions
What Rolling Hills Estates Homeowners Ask
Who issues the permits for this work in Rolling Hills Estates?
City of Rolling Hills Estates Community Development Department, Building and Safety Division. Rolling Hills Estates is a contract city: its Building and Safety Division, part of Community Development at City Hall on Palos Verdes Drive North, uses Willdan for building and safety services, and application materials go to Willdan for building review only after Planning has approved the project.
For ADUs and small additions, the city's submittal list asks for fully dimensioned plans showing existing and proposed lot coverage, plus one set signed by the homeowners association and the adjacent neighbors. Title 17 requires Planning Director grading approval for cut or fill between one and three feet deep or ten to twenty cubic yards of import or export, and Planning Commission approval beyond three feet, beyond twenty cubic yards or on any slope of 35 percent or more, although excavation for a swimming pool under a valid building permit is exempt.
On lots in the H (horse) district, no permit may be issued that would rule out a future horse-keeping area of at least 800 square feet, set 35 feet from any dwelling on or off the lot and ten feet from a swimming pool, with a limited exception for legally built homes that cannot fit one until they are substantially expanded or rebuilt.
We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.
What makes building in Rolling Hills Estates different?
Single-family zones set minimum lots of one acre in R-A-E, 20,000 square feet in R-A-20, 15,000 in R-A-15 and 10,000 in R-A-10, on curving streets that follow the hillsides and mostly end in cul-de-sacs. Pools, spas, patios and decking count at 75 percent of their area toward a lot coverage cap of 25 percent in R-A-E, 30 percent in R-A-20 and R-A-15, and 35 percent in R-A-10, so coverage is often the first number a backyard plan is checked against.
One local condition that shapes the work: The General Plan Safety Element maps more than 1,200 acres of the planning area as Altamont Clay Loam, Diablo Clay Loam and Montezuma Clay Adobe, expansive clay soils with a high shrink-swell potential, so pool shells, slabs and footings are best designed from a site soils report.
Which parts of Rolling Hills Estates do you work in?
All of it, including Dapplegray Lanes, Rollingwood, Los Ranchos Verdes and Ranchview. Our crews run every job out of our Cahuenga Pass base in Los Angeles, with our own people on site.
What does an ADU or addition cost in Rolling Hills Estates?
Detached ADU: generally $150,000 to $400,000+ across Southern California. What moves it is square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build. We give line-item pricing after seeing the site rather than quoting a number over the phone.
How long does an ADU take start to finish?
Plan a realistic year. Design and engineering typically take one to three months, city plan check and corrections add several more, and construction usually runs four to eight months depending on size and site access.
Is a garage conversion cheaper than a detached ADU?
Usually yes, and often substantially, because the foundation, walls and roof already exist. The trade-offs are that you lose the garage, and older slabs and framing sometimes need upgrading to meet current code.
Can I rent the ADU out?
California ADU law is designed to allow long-term rental, and an ADU is one of the few ways to add rentable square footage to a single-family lot. Short-term rental rules vary by city, so confirm your local ordinance before counting on that income.
Do you handle the permits?
Yes. Plans, engineering, Title 24 and the city submittal are all handled in-house, including responding to plan-check corrections. That is a service we sell on its own, so it is not something we hand off.
More Services in Rolling Hills Estates
Pool & Spa Remodeling in Rolling Hills Estates Backyard & Outdoor Living in Rolling Hills Estates Everything we build in Rolling Hills Estates
ADUs & Additions Nearby
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Planning Guides
Before You Build in Rolling Hills Estates
Costs, materials and process notes from our own projects.
ADU Cost Breakdown by Size in Los Angeles A detached ADU in Los Angeles runs $150,000 to $400,000-plus. Here is the real cost broken down by unit size, with the soft costs, utility work and finish decisions that move the number. Read guide Garage Conversion to ADU: The Step-by-Step Build A garage conversion runs $80,000 to $180,000 in Southern California. Here is the real sequence, from slab testing and plan check to the raised floor, the mini-split and final sign-off. Read guide ADU Rental Income Math in the San Fernando Valley A one-bedroom ADU in the San Fernando Valley rents for roughly $2,100 to $2,900 a month. Here is the honest arithmetic on payback, carrying costs and what the unit adds to the property. Read guide Second Story Addition vs Building Out: Which Costs Less Building out runs $350 to $500 per square foot. Going up runs $450 to $700. Here is when the cheaper option is actually the wrong one, and what drives each number. Read guide
Planning an ADU in Rolling Hills Estates?
Sit down with your project manager and get an accurate estimate. We call you back within one business day.
Book a Consultation 818-300-2393
Licensed, bonded & insured · CSLB license #1119054
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