ADU Contractor in San Marino, CA
CSLB Licensed · 1.5M+ Sq Ft Built · 100+ Projects Completed
Active California State License Board General Contractor license.
Family-founded and operated — every project receives personal executive attention.
Full cost transparency with live invoice and cost tracking for every project.
Real-time project progress, photos, schedules, and budget reports in one place.
Why San Marino Chooses DWD Builders
California's updated ADU laws have made it easier than ever to add a high-value dwelling unit to your property. DWD Builders offers a complete turnkey ADU solution — from design and permit acquisition to construction and final inspection — delivering a finished unit that matches your primary home's architectural pedigree. We build detached ADUs, attached ADUs, garage conversions, and JADUs across Los Angeles.
Featured Projects
Single-story detached ADU with stucco exterior, dark wood accents, and drought-tolerant landscaping — delivered turnkey from permit to final inspection.
Contemporary two-story detached ADU with flat roof, private patio, and full kitchen — generating rental income immediately after CO.
This Is What a Premium ADU Looks Like.
Not a converted garage. Not a kit home. A fully permitted, luxury-finished accessory dwelling unit — built to command top rental income or house the people you love.
Los Angeles, CA · Fully Permitted ADU · In-Unit Laundry · Luxury Finish · DWD Builders GC of Record
Get Your ADU Started →Add $2,000–$4,000/mo in Rental Income.
Without Selling Your Property.
An ADU built to this standard rents faster, commands higher rates, and appreciates with your primary property. DWD handles permits, engineering, and every trade — you sign one contract.
Our Process
Free Consultation
Remote or in person — no commitment required. We review your vision, budget, and timeline together.
Design & Planning
We coordinate architects, engineers, and consultants on your behalf to develop construction-ready plans.
Permitting
Our team manages all city and county permit applications, plan-check responses, and approval coordination.
Construction
Weekly video updates, photo reports, and milestone approvals keep you informed throughout the build.
Final Delivery
Certificate of Occupancy, full project handover, and a 1-year workmanship warranty on all DWD work.
“DWD Builders is in a Class of its own. Projects currently under construction are of excellent quality and in some regards even exceed our expectations. The city’s building inspectors are impressed with organization of the jobsite and efficiency of each build. I cannot think of a construction firm more deserving of the highest recommendation.”
Vitus Mataré, Principal Architect
Vitus Mataré & Associates, Inc. — Malibu, California
Designing Westside Los Angeles Homes Since 1974
Frequently Asked Questions — ADU Contractor in San Marino
How long does it take to build an ADU in Los Angeles?
From signed contract to final inspection, most ADU projects in LA take 9–14 months. Permit timelines vary by city jurisdiction — Los Angeles City, LADBS, and county areas all differ. We navigate this for you.
How much does a custom ADU cost?
A high-quality detached ADU in Los Angeles typically ranges from $300K–$700K depending on size, finishes, and site conditions. We provide detailed cost estimates in pre-construction before any commitment.
Can I rent out my ADU?
Yes. ADUs in California can be rented both short-term (with local permit) and long-term. A well-built ADU in LA typically generates $2,000–$6,000/month in rental income depending on size and location.
What is a JADU?
A Junior ADU (JADU) is a unit up to 500 sq ft carved out of existing living space in your primary home. It requires a separate entrance but can share a bathroom with the main unit. JADUs are typically the fastest and lowest-cost ADU option.
Do you handle all permits for the ADU?
Yes. We manage all city and county permit applications for your ADU, including building, electrical, mechanical, and plumbing permits. We respond to plan-check corrections and schedule all inspections.
Will an ADU increase my property taxes?
Adding an ADU typically triggers a supplemental tax assessment on the value of the ADU only — not a full reassessment of your existing home. The tax increase is usually modest relative to the rental income and property value gain.
Ready to Start Your ADU Contractor Project in San Marino?
Contact DWD Builders today. We respond within 2 business hours.