

Architectural ADU Construction
Maximize your property's footprint with seismic-compliant accessory dwelling units designed specifically for Southern California lot configurations.
Built for Southern California
Site-Specific Planning
Seismic-Compliant Build
Turnkey Execution
We engineer custom ADU designs optimized specifically for your lot's unique setbacks, utility connections, and local zoning requirements.
Every structure is built with architectural-grade integrity to exceed Southern California seismic codes and withstand local environmental factors.
From initial site-specific planning to final municipal occupancy permits, our team manages every construction milestone to guarantee on-schedule delivery.
Our Four-Step Method
Feasibility & Zoning
Architectural Drafting
Structural Engineering
On-Schedule Build
We evaluate your lot configurations, utility lines, and local municipal codes to ensure a fully compliant footprint.
Our designers create site-specific plans that blend architectural aesthetics with functional interior layouts, optimizing every square foot of your Southern California lot.
We secure all municipal permits and execute structural foundation work utilizing premium, seismic-compliant materials engineered for long-term durability.
Our construction crews manage the build phase with strict dust-containment protocols, ensuring on-schedule delivery and zero structural surprises.
ADU Construction Insights
What is the timeline?
Are builds seismic-safe?
Typically, custom ADU projects range from six to nine months, depending on local permitting timelines. We provide a fully itemized schedule before breaking ground.
Yes. Every accessory dwelling unit we build is engineered specifically for Southern California seismic codes, utilizing reinforced concrete foundations and structural-grade framing.
Do you handle permits?
How are utilities run?
We manage the entire turnkey permitting phase, coordinating directly with municipal planning departments from Pasadena to Lancaster to secure your occupancy certificate.
Our team assesses your existing electrical panel and sewer lines during site-specific planning to determine if upgrades or direct utility connections are required.
Ready to explore your property's potential with a fully itemized project scope?
West Coast Construction
Architectural-grade execution. Fully itemized scopes.
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estimates@westcoastbuild.com
Serving LA County & Antelope Valley
Mon - Fri: 8:00 AM - 5:00 PM
© 2026 West Coast Construction-Licensed Southern California General Contractor.
ON-SCHEDULE DELIVERY
