ADU Guide for West Hills, CA (2026)

For West Hills homeowners, an ADU can add flexible living space, a rental unit, or a long-term family housing option without selling the property. A strong plan starts with the lot, the jurisdiction, the budget, and a builder who has handled ADU work in West Hills.

ADU permit activity in West Hills

LADBS records show 310 ADU permits filed since 2020 for West Hills. Typical permitted size is about 857 sq ft. Average LADBS project valuation is $73,720. Those permits added 244 ADU units in the yearly rows.

Annual LADBS activity is down, from 40 permits in 2020 to 33 permits in 2026.

Source: LA Dept. of Building & Safety.

What an ADU costs in West Hills

Use $280-$420 per sq ft as the local planning range for a first pass. That puts a 600-1,000 sq ft ADU around $168,000-$420,000, while many California projects still fall in the broader $150,000-$450,000 range. The current CityStat permit valuation signal is $73,720, which is useful for comparing permit records but should not be treated as a full turnkey construction bid.

Permitting and timeline

West Hills ADU permits are handled through LADBS under California's 60-day ministerial review rules for compliant ADUs. Confirm lot-specific setbacks, height, parking, and utility details before submitting plans. California law gives cities 60 days for ministerial review of a complete, compliant ADU application. Plan extra time before submittal for survey work, drawings, utility checks, and any corrections your designer or builder needs to resolve.

Financing

Most West Hills homeowners compare renovation loans, construction loans, HELOCs, and cash-out refinancing. ADU-focused lenders can underwrite against after-build value when the new unit materially increases rent or resale potential. Compare monthly payment, draw schedule, appraisal approach, and whether rental income from the future ADU can support underwriting.

Vetted West Hills ADU builders

• AP Remodeling - 4.9★ (148 reviews)
• Quality First Builders - 5.0★ (92 reviews)
• Acton ADU - 5.0★ (44 reviews)
• Progressive Builders - 4.9★ (41 reviews)
• Villa Homes - 4.7★ (15 reviews)
• Nestadu - 5.0★ (7 reviews)

Get matched in West Hills

See if your property qualifies →

The city page includes the property qualifier form and the live builder shortlist for West Hills. You can also compare the Los Angeles ADU builder hub. Nearby city guides: Los Angeles, Canoga Park, Woodland Hills, Tarzana.