ADU Builders in Westminster, California
Whether you want a rental unit, a home for aging parents or a studio for adult kids, building an ADU in Westminster has never been easier under California's ADU laws. Our team plans every project around the ocean breezes near the coast and warmer foothill valleys typical of Westminster.
Typical cost
$192k–$434k
Permit time
6–10 weeks
Est. rent
$2,300+/mo
Population
90,000
Popular ADU types in Westminster
Our most requested projects in Westminster are two-story ADUs over garages and detached backyard cottages. Many Westminster parcels built between the 1950s and 1980s have wide rear yards that fit an 800–1,200 sq ft detached unit without touching the main house.
Design-wise, Westminster homeowners in the Orange County tend to favor clean coastal contemporary and Mediterranean styles that satisfy HOA-minded neighbors.
Building an ADU in Orange County
Every Westminster ADU we build is engineered around local conditions — especially HOA covenants, coastal commission review and tract-home utility layouts. We prepare complete plan sets so the city can approve within the state's 60-day review window, typically 6–10 weeks here.
At $2,300–$3,750 per month in rent, a new ADU in Westminster can pay for itself in roughly 8.6 years.
Westminster ADU FAQs
How much does it cost to build an ADU in Westminster?
Most Westminster ADUs we build land between $192k and $434k, depending on size, site work and finishes. Garage conversions sit at the low end; custom two-story units at the high end.
How long does ADU permitting take in Westminster?
State law requires cities to act on complete ADU applications within 60 days. In practice, Westminster permits typically take 6–10 weeks when plans are submitted complete — which is what our in-house drafting team focuses on.
What can I rent an ADU for in Westminster?
Based on Orange County rental trends, a new 1-bedroom ADU in Westminster commonly rents for $2,300–$3,750 per month, putting typical payback around 8.6 years.
What are the biggest challenges for ADUs in Westminster?
In Westminster and the wider Orange County, the issues we plan around most are HOA covenants, coastal commission review and tract-home utility layouts. We review these during a free feasibility check before you commit.
Is two-story ADUs over garages a good option in Westminster?
Yes — two-story ADUs over garages are among the most popular projects we build in Westminster. Newer subdivisions in Westminster often have tighter side yards, so we frequently recommend attached ADUs or converting an existing garage to keep costs down.
ADU builders near Westminster
Get a free ADU feasibility check in Westminster
Tell us about your lot. We'll review zoning, setbacks and utilities and send a ballpark budget — no obligation.