Second Story Additions in San Jose, CA
Build up instead of out -- full second-story additions that double your living space on the same footprint.
About Our Second Story Additions Service
When your lot doesn't have room to expand outward, building up is often the best way to add significant square footage. A second-story addition requires reinforcing your home's existing foundation and first-floor structure to carry the new load, so this is one of the more engineering-intensive projects we take on. We handle the structural analysis, temporary roof and weather protection during construction, and full interior build-out for the new level.
What's Included
Our Process
Structural Assessment
A licensed structural engineer evaluates your existing foundation and first-floor framing to determine what reinforcement is needed to carry a second story.
Design & Permitting
We design the new floor plan, stairway location, and roofline, then submit for San Jose building permits.
Reinforcement & Framing
First-floor structural upgrades happen first, followed by second-story framing and temporary weather protection for the home below.
Systems & Finish
Electrical, plumbing, and HVAC are extended to the new floor, followed by drywall, flooring, and finish work through final inspection.
Why Second Story Additions Matters
- Doubles usable space without expanding your lot footprint
- Often the highest ROI addition on smaller San Jose lots
- Adds significant resale value
- Full structural engineering included
- Preserves yard space compared to ground-level additions
Frequently Asked Questions
Will my whole house be exposed to the weather during construction?
Can my house's foundation support a second story?
Can I live in my house during a second-story addition?
Second Story Additions Service Areas
We provide second story additions across San Jose and the South Bay, including:
Get a Free Quote
Free on-site estimate
Starting at
$180,000
Based on square footage added and the extent of structural reinforcement required below. Full engineering evaluation included in every quote.
Duration
8 - 14 months (design + permit + construction)
Warranty
1-year workmanship warranty, structural work covered per code
Other Services
Why Choose Us
- Licensed, Bonded & Insured
- Design-Build Under One Contract
- Permit & Inspection Handled
- Free On-Site Estimates
- Satisfaction Guaranteed
- South Bay Local
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