Our ADU now covers our entire mortgage. This changed our family's life forever.
Remodeling in San Diego
HSP ADU Builders in San Diego.
Full-service ADU construction for San Diego homeowners — detached backyard ADUs, garage conversions, attached ADUs, and JADUs. Design, permits, and build under one team. CSLB #1119646.
What we see, what we build, in San Diego.
San Diego County is one of the most ADU-friendly markets in California. State law reforms SB9 and AB2221 streamlined ADU permitting significantly — most single-family lots in San Diego, Chula Vista, Carlsbad, Encinitas, North Park, and surrounding communities are now eligible for at least one ADU. The rental market is strong, and homeowners are increasingly using ADUs to offset mortgage costs, house family members, or create long-term income property. We have built ADUs across San Diego County — from compact backyard studios to full guest houses with kitchen, bath, and private entrance. CSLB #1119646, bonded and insured.
Services in San Diego
Services we provide in San Diego.
Detached ADU
Standalone backyard ADUs — design, permits, and build under one contract. Rental income or multigenerational living.
Learn moreAttached ADU
ADUs attached to your home — structural engineering, permits, and build under one contract.
Learn moreGarage conversion
Garage-to-ADU conversions — fully permitted, design through finish, under one contractor.
Learn moreJunior ADU
Junior ADUs (JADUs) within your home — up to 500 sqft, fully permitted, with private entrance and kitchenette.
Learn moreWhy San Diego customers pick HSP ADU Builders.
San Diego County permitting handled in-house — city and county plan check, utility service upgrades, and final inspection. One team, one point of contact, from feasibility through final inspection.
In-house permitting
We handle city and county ADU permitting directly in California and Washington — no third-party expediters, no lost weeks. The permit timeline is built into your written proposal so you know what to expect.
Direct owner involvement
The owner is on every project. A dedicated project manager gives you regular on-site updates from start to finish.
Written proposals & timelines
Every project starts with a free consultation and a written proposal: line-item scope, permit timeline, and total cost. Change orders are written and approved before work proceeds.
Reviews
What our customers say.
on Google · 298 reviews
Service area beyond San Diego
We also serve nearby Puget Sound communities.
HQ in San Diego, CA
Planning a remodel in San Diego? Start with a free consultation.
Call 1-888-484-3132 or schedule online. We'll walk through the project on-site and put a written proposal in your hands.