Detached new build ADUs, attached ADUs, garage conversions, and junior ADUs designed and built in house.
Get a free in home consultation in Hidden Hills. Call 310-596-5000 or use the form below.
ADU work and garage conversions in Hidden Hills are state conforming, but the HOA Architectural Committee still reviews any visible change before the building permit ever submits. Paradigm Builders, CSLB 1100775, designs Hidden Hills ADUs and garage conversions with that gated sequence built into the schedule from concept. Most parcels are hillside or estate lots with grading and setback rules layered on top of HOA controls, and a detached ADU that engages a slope can require both HOA approval and grading review. The architectural styles across the community span Ranch, Spanish Colonial, equestrian estate, and contemporary modern, and a new ADU has to read as a respectful extension of the main estate rather than a generic backyard unit. Equestrian use rights shape many lots, so detached ADUs are often positioned around existing barn, paddock, and arena layouts. Limited truck access on private streets defines material delivery and concrete pour logistics. From 1800 Century Park East Suite 600 in Los Angeles our team handles HOA submittals, City of Hidden Hills permits, and field work in one engagement. Call 310 596 5000 to begin a Hidden Hills ADU or garage conversion consultation.
ADU & Garage Conversion Scope in Hidden Hills
- Detached new build ADUs (up to 1,200 sf state default, taller and larger near transit)
- Garage conversion ADUs (existing footprint, ministerial approval pathway)
- Attached ADUs (sharing one wall with the main house)
- Junior ADUs (up to 500 sf inside the main house)
- Site planning, utility separation, and meter coordination
- Foundation and grading, especially for hillside ADU sites
- Title 24 energy compliance, low rise multifamily energy code
- Solar PV (required on most new construction ADUs in California)
Our ADU & Garage Conversion Process
Every Hidden Hills ADU or garage conversion runs through the same end to end process. Design, permits, and construction under one roof.
We walk the Hidden Hills lot to confirm setbacks, lot coverage remaining, slope, sewer capacity, electrical service capacity, and any easement constraints. Some lots can take a full 1,200 sf detached unit; some can only take a JADU.
Floor plan, elevations, and 3D renderings. Roof type, window placement, exterior finish, kitchen layout, and bathroom location are all decided before plans are submitted.
Title 24 calcs, low rise multifamily energy code, solar PV sizing, ventilation, and insulation specs are run before permit submittal. Avoids most corrections from plan check.
Line by line proposal covering site work, foundation, framing, MEP, finishes, solar, and utility tie in. We list which fees are city pass through (school impact, sewer cap charge) and which are construction.
City of Hidden Hills ADU submittal. State conforming, but HOA architectural review applies on top.
Site clearance, foundation, framing, MEP, exterior dry in, interior finish, fixtures, final inspection. Most ADU builds run on a 4 to 7 month construction window.
Final inspections, panel upgrade if required, meter separation if you chose that path, and certificate of occupancy.
What a ADU & Garage Project Looks Like in Hidden Hills
Hidden Hills ADUs are uniquely shaped by HOA Architectural Committee review on top of state conforming ADU law, by the estate scale of most lots, and by the equestrian character of the community. The Hidden Hills Community Association governs every parcel via CC&Rs, and the Architectural Committee reviews ADU plans before any building permit submission. Most parcels are hillside or estate lots, so a detached ADU that engages a slope triggers grading review. Equestrian use rights on many lots influence where the ADU pad can sit relative to barn, paddock, and arena layouts. Limited truck access on private streets means crane work, concrete pours, and material deliveries have to be coordinated with the HOA. The architectural language across Ranch, Spanish Colonial, equestrian estate, and contemporary modern shapes how the ADU cladding, roof pitch, and window proportions get detailed against the main residence.
ADU & Garage Conversion Permits in Hidden Hills
ADU work in Hidden Hills follows California state ministerial approval rules with city specific layers on top. Here is the path your project follows.
Where the permits go. ADU submittals in Hidden Hills are processed by City of Hidden Hills, with planning and building services coordinated through neighboring jurisdictions and the Hidden Hills HOA Architectural Committee under California state ministerial timelines.
ADU and accessory unit rules. State conforming, but HOA architectural review applies on top.
Code specifics. HOA Architectural Committee review precedes any building permit submittal. Equestrian use rights shape many lots.
ADU & Garage Conversion Cost in Hidden Hills
Hidden Hills ADU and garage conversion pricing typically depends on the depth of HOA Architectural Committee review, the volume of grading on a hillside or estate lot, and the architectural matching required against the main residence. Costs also depend on how material delivery is staged given limited truck access on private streets, plus any coordination with equestrian use elements such as barn and paddock layouts. HOA cycles and City of Hidden Hills permit timelines add to overall duration. Paradigm Builders builds line item budgets after site review.
Common Questions: ADU & Garage Conversion in Hidden Hills
Can I build an ADU on my Hidden Hills lot?
Most likely yes. California state law allows at least one ADU plus one JADU on virtually every single family lot. Hidden Hills layers local rules on top. We walk the lot before any design work to confirm setbacks, lot coverage, and any overlay constraints.
How long does an ADU take to build in Hidden Hills?
Permit timeline runs 60 to 120 days under California state ministerial approval, plus a 4 to 7 month construction window. From signed design contract to final inspection most Hidden Hills ADUs run 8 to 14 months total.
Will my property taxes go up?
Yes, but only on the assessed value of the new ADU. The existing house keeps its current assessment under Prop 13. The ADU is valued at construction cost basis.
Do I need to live in the main house if I rent the ADU?
California removed the owner occupancy requirement for most ADUs through Dec 31, 2024 then reinstated it with exceptions starting 2025. Junior ADUs still require owner occupancy in the main house or the JADU. We confirm current rules at the feasibility walk.
Can I convert my detached garage instead of building new?
Yes. Garage conversions to ADUs are a ministerial process under state law and are usually the lowest cost ADU path. The slab, walls, and roof are existing, which cuts site work and framing scope significantly.
Do you handle the solar requirement?
Yes. New construction ADUs over 80 percent new floor area trigger the solar mandate. We size and install the PV system as part of the build. Garage conversions are usually exempt.
Nearby Cities We Serve
Paradigm Builders works throughout the greater Los Angeles area. ADU & Garage Conversion pages for nearby cities:
Ready to Build an ADU in Hidden Hills?
Send your ADU project details below. We confirm site feasibility, walk the lot, and follow up with a unit plan, scope estimate, and ADU permit timeline for your Hidden Hills property.
[contact form-7 id=”343″ title=”Footer Form”]
Or call 310-596-5000
Paradigm Builders
1800 Century Park East Suite 600
Los Angeles, CA 90067
Phone: 310-596-5000
Email: info@paradigmbuilders.com
California Contractors State License Board: License 1100775
Serving Hidden Hills and the greater Los Angeles metro area.
