About Home Additions San Jose
Your trusted design-build general contractor serving San Jose and the South Bay. “San Jose's Home Addition & ADU Builders”
Your Trusted Design-Build Team
Home Additions San Jose was founded in 2011 with a simple mission: give South Bay homeowners a single, accountable contractor for the entire addition process -- design, permitting, and construction -- instead of juggling separate architects, engineers, and builders.
We specialize in ADUs, room additions, second-story builds, garage conversions, kitchen and bathroom additions, in-law suites, and home office additions. Every project receives our full attention, whether it's a backyard ADU in Willow Glen or a full second-story build in Almaden Valley.
Our team consists of licensed, insured tradespeople who take pride in their work and stay current on San Jose's permitting and zoning requirements. We don't consider a job done until it passes final inspection and you're completely satisfied.
CSLB Licensed
Licensed & Insured
2011
Founded
8 Specialties
Services
48 Hours
Estimate Turnaround
Our Commitment to You
Design-Build, One Contract
Architectural design, structural engineering, permitting, and construction all under one contract -- one point of accountability from concept to final inspection.
Transparent Pricing
We provide clear, itemized estimates with no hidden fees. You know exactly what you are paying before any contract is signed.
Fully Permitted Work
Every addition, ADU, and conversion is permitted and inspected through San Jose Building -- no unpermitted work that creates problems at resale.
Why San Jose Chooses Us
Transparent pricing, licensed tradespeople, and a workmanship guarantee on every addition.
Licensed, Bonded & Insured
Fully licensed CSLB general contractor carrying general liability and workers' comp on every job site.
Design-Build, One Contract
Architectural design, engineering, permitting, and construction all under a single contract and point of contact.
Permit-First Process
We handle San Jose permit submission and plan-check corrections so your project stays on schedule, not stuck in city hall.
Local South Bay Team
Based in San Jose and familiar with the zoning, setback, and soil conditions across Santa Clara County.
Get Your Free Estimate Today
Whether you need a new ADU, a room addition, or a full second story, our team is ready to scope your project. Text us now for a free on-site estimate.
Since 2011
South Bay Local
Licensed
Bonded & Insured
10+
Cities Served
Free
Estimates Always