Home Addition Services in San Jose
Need more room without the hassle of moving? DTI Construction designs and builds room additions, second-story expansions, and home extensions that blend seamlessly with your existing home — adding the space and value your family needs.
Room Additions & Second-Story Expansions
In Silicon Valley's housing market, adding on is often smarter than moving on. DTI Construction builds home additions that give you the extra bedroom, bigger kitchen, home office, or primary suite you need — engineered to match your home's structure, roofline, and style so the addition looks original, not tacked on.
We manage the entire build: architectural plans and engineering, permits, foundation and framing, roofing, and full interior finishing that ties the new space into the old. As a licensed general contractor with 20+ years of experience, we keep a complex project organized, code-compliant, and on schedule.
Why Homeowners Trust DTI for Home Additions
20+ Years of Experience
Two decades remodeling homes and commercial spaces across San Jose and the greater Bay Area. Seasoned crews who've solved every problem an older Silicon Valley home can hide.
Licensed & Insured
A fully licensed, bonded, and insured California general contractor. We pull the proper permits and build to code — protecting your home and your investment.
On-Time, On-Budget
Honest estimates and realistic timelines you can plan around. We respect your schedule and your budget, and we deliver what we promise.
Clear Communication
One dedicated point of contact from first walkthrough to final punch list. You always know what's happening, what's next, and why — no guesswork.
What Our Home Additions Includes
From single-room additions to full second stories, we handle the design, structure, and finishes that make new space feel original.
Room Additions
New bedrooms, family rooms, offices, or sunrooms that expand your footprint on the ground floor.
Second-Story Additions
Add a whole floor when you're out of yard — new bedrooms and baths above your existing home.
Primary Suite Additions
A private primary bedroom and spa bath addition that transforms daily life.
Kitchen & Living Expansions
Bump-outs and expansions that open up cramped kitchens and living areas.
Structural & Roofing
Engineered foundations, framing, and rooflines that integrate cleanly with your home.
Seamless Finishing
Interior and exterior finishes matched so the addition looks like it was always there.
Built Right, Built to Last
From Idea to Completion
A clear five-step process that keeps your project organized, on schedule, and on budget.
Consultation
We listen to your goals, budget, and timeline — honest advice, no pressure.
Free Estimate
A detailed, transparent written estimate so you know exactly what to expect.
Design & Planning
Plans, selections, and permits handled so the build starts on solid ground.
Construction
Skilled, licensed crews build to code with clean, respectful job sites.
Final Walkthrough
We walk every detail with you and don't finish until you're thrilled.
Our Work Across San Jose
Why Homeowners Trust DTI
A home addition touches your foundation, framing, roof, and finishes all at once, so coordination is everything. San Jose homeowners trust DTI to manage that complexity — engineering, permits, and trades — and deliver an addition that's structurally sound, code-compliant, and indistinguishable from the original home.
Frequently Asked Questions
We build room additions, second-story additions, primary suite additions, and kitchen or living-area expansions — anything that adds functional square footage to your home.
What Our Clients Say
See why Bay Area homeowners trust DTI Construction Inc.
DTI remodeled our kitchen and two bathrooms. Manny and his crew were professional, punctual, and incredibly skilled. Finished on time and the quality is outstanding. Highly recommend.
From the first estimate to the final walkthrough, communication was clear and honest. No surprises, no hidden costs. Our new primary bath looks like a luxury spa. Reliable and trustworthy.
We hired DTI for a full home remodel and they exceeded every expectation. Meticulous craftsmanship, respectful crew, and a job site that was clean every single day. True professionals.
Manny built our detached ADU and handled all the permits. He kept us informed the whole way and delivered on budget. The unit is beautiful and already rented. Couldn't be happier.
Honest estimate, skilled work, and they finished when they said they would. DTI opened up our kitchen and living area and it completely transformed the house. Excellent contractor.
DTI remodeled our kitchen and two bathrooms. Manny and his crew were professional, punctual, and incredibly skilled. Finished on time and the quality is outstanding. Highly recommend.
From the first estimate to the final walkthrough, communication was clear and honest. No surprises, no hidden costs. Our new primary bath looks like a luxury spa. Reliable and trustworthy.
We hired DTI for a full home remodel and they exceeded every expectation. Meticulous craftsmanship, respectful crew, and a job site that was clean every single day. True professionals.
Manny built our detached ADU and handled all the permits. He kept us informed the whole way and delivered on budget. The unit is beautiful and already rented. Couldn't be happier.
Honest estimate, skilled work, and they finished when they said they would. DTI opened up our kitchen and living area and it completely transformed the house. Excellent contractor.
We added a bedroom and expanded our kitchen. DTI matched the new construction perfectly to the existing home — you'd never know it was an addition. Professional and dependable throughout.
Great experience start to finish. The team was courteous, the pricing was fair, and the workmanship is top-notch. They treated our home like their own. Would absolutely use them again.
DTI handled our second-story addition and the results are stunning. Manny managed every detail and every subcontractor flawlessly. On time, on budget, and beautifully built.
Our master bath remodel is flawless — the tile work and glass shower are perfect. DTI is skilled, clean, and communicative. Best contractor experience we've had in the Bay Area.
Reliable, professional, and genuinely honest. They finished our basement into a guest suite and the whole process was smooth and stress-free. Quality craftsmanship you can count on.
We added a bedroom and expanded our kitchen. DTI matched the new construction perfectly to the existing home — you'd never know it was an addition. Professional and dependable throughout.
Great experience start to finish. The team was courteous, the pricing was fair, and the workmanship is top-notch. They treated our home like their own. Would absolutely use them again.
DTI handled our second-story addition and the results are stunning. Manny managed every detail and every subcontractor flawlessly. On time, on budget, and beautifully built.
Our master bath remodel is flawless — the tile work and glass shower are perfect. DTI is skilled, clean, and communicative. Best contractor experience we've had in the Bay Area.
Reliable, professional, and genuinely honest. They finished our basement into a guest suite and the whole process was smooth and stress-free. Quality craftsmanship you can count on.
From Idea to Completion — Let's Build It Together
Add On With DTI Construction
Contact DTI Construction Inc. today for your free consultation and honest written estimate.
Start Your Home Transformation With Experts Today
Tell us about your project and we'll get back to you within 24 hours with honest advice and a written estimate.
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