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24in.
Caisson diameter, Type P1, on our Macapa Drive hillside project
12ft
Minimum embedment into bearing material on the same schedule
20–35%
Slope premium over an equal flat-lot build
Aggregate Construction Group, 2026
$500K
Our project minimum. We publish it so you do not lose a month finding out.
Hillside Construction · Los AngelesAnybody can build on flat land.
Anybody can build on flat land.
We build where it's hard.
Steep lots, deep foundations, canyon access. Energize Builders is the Los Angeles general contractor for the sites other builders turn down. A hillside lot is not a flat lot with a view. On a flat lot the house sits on the ground; on a hillside lot the house is anchored into it, and every difference in cost, schedule and who you need on the team follows from that one fact.
Loose surface soilBedrockFoundation system: walls, caissons, grade beamStructureSwipe sideways for the whole drawing.
Read it left to right. The road decides what equipment can reach the lot. The cut decides how much wall you need. Bedrock decides how deep the caissons go. Only then does the house get drawn. Hover a step to see that part alone.
Deep foundations
Where surface soil cannot carry the structure, the load goes down to competent bedrock through drilled cast-in-place caissons tied together with grade beams. On our Macapa Drive project the structural set called for five new Type P1 caissons, 24 inches in diameter, embedded a minimum of 12 feet beneath the downhill addition.
Caisson layout is not a detail. It decides the drill rig you need, the access you need to get it there, and a large share of the foundation budget.
Soils come first
A geotechnical investigation and a soils report govern the design. The geotechnical engineer sets bearing capacity, embedment depth, setbacks from the slope face and drainage. Design that starts before that report exists gets redesigned.
Retaining and shoring
Cut-and-fill on a slope means retaining walls, shoring during excavation, and a drainage system behind every wall. These are structural elements carrying real loads. They get engineered and inspected as such.
Access is a budget line
A narrow canyon road decides the size of your concrete truck, whether you need a pump, where material can stage and how long every delivery takes. We assess access before we price the work. On hillside sites it is often the difference between two bids.
Permitting is its own project
Los Angeles hillside properties fall under the Baseline Hillside Ordinance, which controls buildable floor area, height, grading quantities and street access. Grading permits run through LADBS alongside the building permit. Hillside review adds time that belongs in the schedule on day one, not month four.
Special inspection throughout
Deep foundation work is observed and documented as it happens: drilling depth, bearing material, reinforcement placement, concrete placement. Those records matter at final sign-off and again the day the house sells.
One set of people, right the first time
Geotechnical, structural, architect and builder have to agree before plan check. We coordinate all four so the set that reaches the city is buildable at the number we quoted.
Five projects · Five neighborhoods
What the hill gives back
Nobody builds on a slope for the foundation bill. They build there for this.
How we run a hillside project
Six steps, in the order they have to happen
01
Site and access walk
Before anything is priced we walk the lot: slope, drainage, existing structures, and how equipment and material reach the site. On canyon roads this changes the budget more than any finish selection will.
02
Geotechnical investigation
A geotechnical engineer bores the site and issues the report that governs the foundation: bearing capacity, embedment, slope setbacks, drainage. Everything structural waits on this document, so we start it early.
03
Structural design and coordination
The structural engineer designs caissons, grade beams, retaining walls and shoring to the geotechnical findings. We coordinate architect, structural and geotechnical into one buildable set.
04
Hillside permitting and grading approval
Building permit, grading permit and Baseline Hillside Ordinance compliance through LADBS. Hillside review takes longer than flat-lot review. We schedule to the real timeline, not the hopeful one.
05
Drilling, shoring and foundation
Caissons are drilled and poured, grade beams tie the system together, retaining and shoring go in with their drainage. This is the phase where hillside projects are won or lost. It is the phase we are built for.
06
Structure, finishes and handover
Framing through finish, on the same access constraints that shaped the foundation. We supervise directly, document inspections as they clear, and hand over a project that closes out clean.
What it costs
We would rather tell you the range before you call than after
The first two figures are ours, from the homes we have built. The last two are published Los Angeles market figures. None of it is a quote. Your number depends on geology, access, the retaining scheme and how much hillside you are moving, and nobody knows it before the soils report exists.
Standard custom homeper square foot, Energize Builders projects
$450 – $700
High-end custom with hillside complexityper square foot, Energize Builders projects
$700 – $1,000+
Slope premium over a flat-lot buildAggregate Construction Group, 2026
20 – 35%
Drilled caissonsper linear foot, Aggregate Construction Group, 2026
$800 – $1,500+
$500,000 minimum
Below that number we are not the right builder, and we will say so on the first call rather than after a month of drawings.
Before you call
The questions we get on the first call
Short answers here. Longer ones on the phone, with your lot in front of us.
How much does it cost to build a house on a hillside lot in Los Angeles?
Our custom homes have run $450 to $700 per square foot, and high-end homes with hillside complexity $700 to $1,000 and up. Published Los Angeles guidance puts the slope premium at 20 to 35 percent over the same house on a flat lot (Aggregate Construction Group, 2026). The real number waits on the soils report, because the foundation is where a hillside budget moves most.
Do I need a soils report before I can get a bid?
You need one before you can get a real bid. We will give you a range from a site walk, but the caisson depths, the retaining scheme and the grading quantities all come out of the geotechnical report, and so does most of the cost. We start it early for that reason.
What is the Baseline Hillside Ordinance?
The City of Los Angeles zoning rules for hillside lots. It limits how much floor area you can build for a given slope, caps height, restricts how much earth you can move, and sets street access requirements for construction. Hillside projects go through it alongside the building and grading permits, and it adds review time.
How long does hillside permitting take?
Longer than a flat lot, because grading, geotechnical review and hillside zoning review are added to the normal plan check. We put the real timeline in the schedule at the start. Anyone who promises you flat-lot speed on a hillside has not built one.
Can you build on a lot with a narrow canyon road?
Yes. Access changes the method, not the answer: smaller trucks, a concrete pump, a crane pick, staging off site. We walk the access before we price the work, because on canyon roads it is often the difference between two bids.
Who is Energize Builders?
A Los Angeles general contractor, CSLB #1112649, that builds custom homes on hillside lots across the Westside, the Santa Monica Mountains and the Hollywood Hills. You can verify our license on the CSLB website at any time. Our foundation work is performed under special inspection and documented as it goes.
Where we build
Pacific Palisades, and the hills around it
Pacific Palisades is rebuilding lot by lot, and many of those lots are steep. If yours is one of them, or you are on a slope anywhere from Malibu to Calabasas, send it to us.
Caisson foundations, explainedThe one page on this site written for the owner with a soils report in hand.
- Pacific Palisades
- Malibu
- Bel Air
- Beverly Crest
- Beverly Hills
- Hollywood Hills
- Mandeville Canyon
- Brentwood Hills
- Sherman Oaks Hills
- Encino Hills
- Hidden Hills
- Calabasas
Start here
Have a steep lot?
Send us the address and any reports you already have. Within a week we will tell you whether it is a project for us, and what we would want to know next.
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