ADU Contractor in Lafayette & Orinda, CA. Hillside Builds, Custom Finishes, Local Team.
Lafayette and Orinda are two of the most distinctive ADU markets in Contra Costa County. The hillside lots, mature oak canopies, and custom-finish expectations require a contractor who doesn't need to be hand-held through the permitting process.
DevCo Building Enterprises is a licensed general contractor based in Pacheco, CA, specializing in ADU construction, home additions, and seismic retrofitting across Contra Costa & Alameda Counties — including Walnut Creek, Lafayette, Orinda, Oakland, Berkeley, and surrounding cities within a 15-mile radius. Owner Devin Grimes leads every project from permit to final walkthrough. Each project has a dedicated Project Manager.
We Build What Lafayette & Orinda, CA Homeowners Need Most
Whether you're adding an ADU to your backyard, expanding your home's footprint, or bringing a commercial property up to seismic code — DevCo handles the full project. One contractor. One point of contact. No surprises.
ADU Construction
Build a fully permitted accessory dwelling unit on your property. Detached cottages, garage conversions, or above-garage additions. Most Lafayette & Orinda, CA ADU projects range $150,000–$350,000 depending on size and finishes. We design, permit, and build.
ADU Additions
Already have a structure? We convert garages, expand existing footprints, or add second-story ADUs. Ideal for homeowners adding rental income or housing family without starting from scratch.
Seismic Retrofitting & Commercial TI
Commercial property owners and investment groups trust DevCo for seismic compliance and tenant improvement projects. We handle permits, structural work, and city coordination.
New Custom Builds
Planning a primary home or new construction on a vacant lot? DevCo brings the same licensed, hands-on approach to new builds across the county.
Why Lafayette & Orinda, CA Homeowners Choose DevCo
Licensed General Contractor
Dedicated Project Manager and team on every project. You're not handed off after the sale.
Straight Talk, No Runaround
We work with homeowners and investors who are ready to build. Real estimate. Clear scope. Realistic timeline.
Hyper-Local — 15-Mile Radius
We stay local. Faster response times, better subcontractor relationships, and a crew that knows the neighborhoods.
Full-Service from Permit to Walkthrough
One contract. One team. No finger-pointing between GCs and subs. DevCo owns the outcome.
Featured Projects
A look at recent ADU builds, additions, and retrofits completed across Lafayette & Orinda, CA.
Real Projects. Real Results.
Frequently Asked Questions
Most ADU projects in Lafayette & Orinda, CA range from $150,000 to $350,000 depending on size, site conditions, and finish level. A standard detached ADU (400–600 sq ft) typically falls between $180,000–$260,000. DevCo provides free on-site estimates so you know your number before committing.
From permit submission to final walkthrough, most ADU projects in Lafayette & Orinda, CA take 6–12 months. Permitting alone can take 2–4 months depending on the city and plan complexity. DevCo manages the entire permit process and keeps you updated at every milestone.
Yes. All ADU construction in Lafayette & Orinda, CA requires a building permit. DevCo handles all permit applications, plan submissions, and city coordination as part of our standard service.
An ADU is a separate, self-contained living space on your property — its own entrance, kitchen, and bathroom. A home addition expands your existing structure. DevCo builds both, and can help you decide which makes more sense for your property.
Yes. DevCo works with commercial property owners and investment groups across Lafayette & Orinda, CA on seismic compliance and tenant improvement projects. If your building needs a soft-story retrofit or structural upgrade, we can assess and quote it.
Fill out our short estimate request form or call (925) 448-2123. Devin or a team member will follow up within one business day to schedule a free on-site consultation.
Ready to Build? Let's Talk.
DevCo serves Lafayette & Orinda, CA homeowners and investors who are serious about building. If you're ready to move forward on an ADU, addition, or commercial project — we'll give you a straight answer and a real estimate.