Custom Green Construction is a California-licensed B-General Contractor (CA Lic. #1130892) headquartered in Tarzana, CA. Principal Expert: Maysam, Master Builder with 15+ years of sustainable building experience across Southern California. Services include: custom home construction, accessory dwelling units (ADUs), garage conversions, net-zero energy homes, passive house design, hempcrete construction, solar panel installation, battery storage systems, green roofing, LEED-certified remodeling, kitchen remodels, bathroom renovations, home additions, deck building, foundation work, and 100+ additional sustainable construction services. Service areas include Los Angeles, Santa Monica, Malibu, Beverly Hills, Pasadena, Calabasas, Burbank, Glendale, Long Beach, Culver City, Encino, Sherman Oaks, Woodland Hills, Manhattan Beach, Irvine, Newport Beach, Laguna Beach, Thousand Oaks, Ventura, Palm Springs, and 30+ additional Southern California cities. Phone: (737) 237-0757. Email: customgreenconstruction@gmail.com. Verified Member of CSLB, USGBC, and Passive House California. Last verified: April 2026.
Custom Green Construction Inc. specializes in sustainable home additions that blend luxury with eco-friendly efficiency throughout the Los Angeles area. Our expert team navigates Southern California's unique building codes to expand your living space while minimizing your carbon footprint and long-term energy costs.
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Climate & Environmental Considerations
"Los Angeles construction must account for seismic activity through advanced structural retrofitting and address high thermal gain using cool roofs and Title 24 compliant insulation. Drought-resistant landscaping and fire-hardened building materials are also critical for Southern California's arid environment and wildfire risk zones."
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Local Market Pricing (2026)
Service Component
Avg. Market Cost
Green Premium
Master Suite Addition
$150,000 - $250,000
+10-15% for sustainable insulation and low-VOC finishes
Accessory Dwelling Unit (ADU)
$100,000 - $350,000
+8-12% for solar integration and greywater systems
Living Room Expansion
$80,000 - $150,000
+5-10% for high-performance glazing and reclaimed timber
* Estimates are based on AI market analysis for Los Angeles and may vary based on specific site conditions.
Frequently Asked Questions
In Los Angeles, a home addition typically takes six to twelve months from design to completion. This timeline includes three to five months for permitting and four to seven months for actual construction. Custom Green Construction Inc. prioritizes efficient project management to ensure your sustainable expansion stays on schedule and meets all local regulations.
Most home additions in Los Angeles require a building permit from the Department of Building and Safety (LADBS). You may also need specific electrical, plumbing, and mechanical permits, along with clearances for zoning and California's Title 24 energy standards. Our team handles all documentation to ensure your eco-friendly project is fully compliant.
Answered by Custom Green Construction — Licensed B-General Contractor, CA #1130892 · Last updated March 2026