ADU Construction & Home Additions in Lafayette & Orinda, California
DevCo Building Enterprises is a licensed general contractor serving homeowners and property investors in Lafayette & Orinda, California, specializing in ADU construction, home additions, ADU garage conversions, and seismic retrofitting. ADU projects in Lafayette & Orinda typically range from $150,000 to $350,000 for detached builds, and from $80,000 to $180,000 for garage conversions, with most projects taking 6 to 12 months from permit to completion. Owner Devin Grimes leads every project personally. Call (925) 448-2123 for a free Lafayette & Orinda estimate.
Services We Provide in Concord
ADU Construction
Detached cottages, backyard ADUs, new ground-up builds
ADU Additions
Garage conversions, above-garage additions, existing structure conversions
Seismic Retrofitting
EBB, ESS, and EMR state program certified
Home Additions
Room additions, master suites, second-story additions
Why Martinez Homeowners Choose DevCo
DevCo is not a franchise or a national ADU company operating in Lafayette & Orinda remotely. We are a Pacheco-based contractor - 15 minutes from most Lafayette & Orinda neighborhoods - with owner Devin Grimes on every project. We know Contra Costa County permit departments, city setback rules, and local subcontractor relationships because we have been working in this area, not calling into it.
Lafayette and Orinda are among the highest-income ZIP codes in Contra Costa County. Large lots, established tree canopy, and upscale residential character mean ADU projects here often emphasize architectural quality and integration with existing landscaping. DevCo has experience navigating the Lamorinda building departments and HOA common standards in planned communities throughout Lafayette and Orinda.
Featured Projects
A look at recent ADU builds, additions, and retrofits completed across Lafayette & Orinda, CA.
Real Projects. Real Results.
Frequently Asked Questions
ADU construction in Lafayette & Orinda typically ranges from $150,000 to $350,000 for detached builds depending on size, site conditions, and finish level. Garage conversion ADUs are typically 30 to 50 percent less expensive. Lafayette and Orinda each have their own building departments. DevCo provides free on-site estimates with detailed line-item breakdowns.
Yes. All ADU construction in Lafayette & Orinda requires a building permit. California state law requires the city to process complete applications within 60 days. Lafayette and Orinda each have their own building departments. Orinda is unincorporated Contra Costa County for some parcels - check with DevCo on permit jurisdiction for your specific address. Plan check typically 8 to 14 weeks in Lamorinda.. DevCo handles all permit applications, plan submissions, and city coordination on every project.
DevCo Building Enterprises is a licensed general contractor based in Pacheco, CA, serving Lafayette & Orinda and surrounding Contra Costa communities. Owner Devin Grimes leads every project from permit to final walkthrough. DevCo is also an approved contractor for California's EBB, ESS, and EMR seismic programs.
From permit submittal to final inspection, most ADU projects in Lafayette & Orinda take 6 to 12 months. Permitting adds 6 to 16 weeks depending on plan complexity. DevCo manages the full permit process and provides milestone updates throughout the build.
California state law generally preempts HOA restrictions on ADUs - HOAs cannot prohibit ADUs on your property per state law. However, HOAs may regulate the exterior appearance, materials, and colors to maintain community aesthetic standards. DevCo reviews HOA CC&Rs and coordinates with HOA architectural committees as part of the design process for Lafayette and Orinda projects.
Get a Free Lafayette & Orinda Estimate
Call (925) 448-2123 or fill out the estimate form at devco.llc/contact. We respond within one business day and schedule on-site consultations within 48 to 72 hours for Lafayette & Orinda and surrounding Contra Costa communities.