Home Addition Construction in San Jose, CA
When your family outgrows your current space, a home addition is the most cost-effective way to gain square footage without moving. San Jose ADU & Remodeling builds seamless home additions that match your existing architecture and significantly increase your home's value and livability.
Unlike a standalone ADU, a home addition integrates directly with your existing structure — expanding your living area while preserving the flow of your current floor plan.
Second-Story Additions
Add a full floor to your home without sacrificing yard space — ideal for growing families.
Bump-Out Additions
Small targeted expansions of a kitchen, bedroom, or bathroom — big impact, lower cost.
In-Law Suites
Connected private quarters for family members with separate entrance options.
Sunroom Additions
Glass-enclosed living spaces that bring the outdoors in year-round.
Home Addition vs. ADU: Which Should You Choose?
A home addition integrates directly with your existing structure and shares utilities — it's ideal when you want more connected living space. An ADU is a separate unit that qualifies for independent rental income. See our detailed comparison: Home Addition vs ADU: Which Is Right for You?
Home Addition Cost Factors
- Square footage added
- Type of addition (ground-floor vs. second story)
- Foundation work required
- Roof tie-in complexity
- Interior finishes and fixtures
- Plumbing and electrical scope
- Permit and engineering fees
The Home Addition Process
- Free on-site consultation and feasibility review
- Architectural design and engineering drawings
- Permit application with the City of San Jose
- Foundation, framing, and structural work
- Roofing, windows, and weatherproofing
- MEP (mechanical, electrical, plumbing) rough-in
- Insulation, drywall, and interior finishes
- Final inspections and certificate of occupancy
Planning Your Home Addition
We handle permits, engineering drawings, and all contractor coordination. Visit our permit FAQ to understand what's required, and see how a room addition compares for smaller-scale projects.