Construction, Remodeling & Drainage in Concord, CA
Homeowners in Concord call Yi Builders (Yi Construction LLC, CSLB License No. 1103231) for remodeling, additions, ADUs and the drainage and site work that protects Bay Area homes. Every project starts with a free site visit and a written, itemized proposal — no pressure, and no vague allowances.
Our services in Concord
Kitchen Remodeling
Full kitchen renovations planned around how you actually cook and gather — new layouts, cabinetry, counters, lighting and finishes, built by one crew from demo to final walkthrough.
Learn more →
Bathroom Remodeling
Bathrooms rebuilt for daily comfort and long life: waterproofing done right, tile, fixtures, ventilation and lighting, with careful protection of the rest of your home.
Learn more →
Whole-Home Remodeling
Coordinated renovations across the whole house, so structure, systems and finishes are planned together instead of patched room by room.
Learn more →
Home Additions
Room additions and expansions that match your existing home — foundation, framing, roof tie-ins and finishes handled under one permit and one schedule.
Learn more →
ADU Construction
Accessory dwelling units for family or rental income, from feasibility and layout through permits and construction, built to California ADU rules.
Learn more →
New Construction
Ground-up residential construction managed by a licensed general contractor, with clear staging, inspections and communication at every step.
Learn more →
French Drain & Drainage
Our specialty: French drains and drainage systems that move water away from your foundation and hillside. Proper depth, cleanouts for maintenance, and gravel-and-fabric construction that lasts.
Learn more →
Retaining Walls & Site Work
Retaining wall repair and replacement, excavation, grading and site drainage — the structural outdoor work that keeps Bay Area hillside properties stable.
Learn more →
Concrete & Hardscape
Driveways, walkways, patios and concrete bases poured and finished cleanly, including channel drains set into existing concrete or tile with careful cutting.
Learn more →Planning a project in Concord?
Start with the free instant estimator on our home page for a ballpark range, or send the form below and we will schedule a free site visit in Concord. For drainage and retaining-wall work the visit matters most: slope, soil and discharge options decide the right design, and we check all three in person before quoting.