Calabasas is a western LA County foothill city where Old Town Calabasas’ historic core sits among upscale planned communities climbing toward the Santa Monica Mountains. The Oaks’ gated streets, Calabasas Park, Mulwood, Mountain View Estates, and Calabasas Highlands share a pattern: 1970s–90s custom and tract homes on generous lots, many with pools, three-car garages, and canyon or valley views. The Commons at Calabasas and the Las Virgenes Road corridor anchor the city’s commercial life. Large lots and high home values make this strong ADU territory.
On these generous parcels, a full-size detached ADU up to 1,200 square feet is frequently feasible — a true backyard cottage or guest house with private outdoor space that suits multigenerational families or long-term rental income. Existing detached structures and oversized garages convert cleanly. In gated communities like The Oaks, HOA architectural review runs alongside city review — we confirm the HOA’s process during feasibility.
Attached additions off the rear of the home suit properties where the main home’s massing leaves a workable yard, and junior ADUs up to 500 square feet carved from existing living space give owners a low-key option — quarters for an aging parent or staff within the existing footprint. State law prohibits owner-occupancy requirements for standard ADUs, and the ministerial (by-right) process applies — a compliant project cannot be pushed into discretionary hearings.
Projects run through the City of Calabasas Community Development Department. State law caps required side and rear setbacks at 4 feet, and junior ADUs require a recorded deed restriction. The local wrinkle is the hillside and fire country: much of Calabasas sits in fire-severity zones — the Woolsey Fire’s footprint is recent memory here — so defensible space and ember-resistant detailing shape design, and we confirm the exact requirements during feasibility.
The 101 corridor ties Calabasas to job centers across the west valley, and local commercial and office employment keeps rental demand steady for well-built units. The 1970s–90s housing stock is generally newer than the valley average, but we still evaluate panels and laterals on older properties as part of the site evaluation.
Ready to find out what your Calabasas lot can carry? ADU Cities is a Southern California ADU design-build firm — we handle feasibility, design, permits, and construction under one roof. Call 310.880.9718 for a free consultation and site evaluation. CSLB #1138550.