Home Addition in Cupertino
Custom Home builds home additions in Cupertino at $400-$600 per square foot. Whether you need a second-story addition, ground-floor expansion, or bump-out, our two-phase process delivers 3D visualization and itemized pricing before construction starts.
How much does a home addition cost in Cupertino?
Home additions in Cupertino typically cost $400-$600 per square foot in 2026. A 500 sqft addition ranges from $200K to $300K. Custom Home's design phase locks in your exact cost before construction starts.
Why Expand Your Cupertino Home
Cupertino’s strong property values and desirable neighborhoods make home additions a smart investment. Rather than uprooting to a new location, expanding your current home lets you stay in the community you chose. Silicon Valley’s tech-driven economy supports strong demand for modern, energy-efficient residences.
Custom Home designs and builds home additions with the same two-phase process we use for custom homes. You see the complete addition in 3D and receive itemized pricing before construction begins.
Types of Home Additions We Build in Cupertino
Second-Story Additions
Double your living space by building up rather than out. Second-story additions are ideal when lot coverage limits prevent ground-floor expansion. Custom Home’s structural engineers evaluate your existing foundation to determine what reinforcement is needed.
Ground-Floor Room Additions
Extend your home’s footprint with new bedrooms, family rooms, or home offices. Ground-floor additions integrate with your existing layout and maintain single-level living, which is especially valued in Cupertino.
Bump-Outs and Extensions
Smaller expansions that make a significant difference: extend your kitchen, enlarge a bathroom, or add a sunroom. Bump-outs typically cost less and complete faster than full additions.
Structural Considerations for Cupertino Additions
Cupertino is located in a seismically active region, which means home additions must meet current seismic codes. Custom Home’s engineering team handles foundation evaluation, load-bearing wall modifications, and seismic design for every addition project. Whether you are adding a second story or expanding your footprint, structural engineering is included in our Phase 1 design process.
Cupertino Home Addition Permits
Cupertino’s Community Development Department handles residential building permits. Plan review for new construction typically takes 4-6 weeks. The city offers counter permits for minor projects and requires design review for homes in the Monta Vista hillside area. Online permit tracking is available through the city’s portal.
Custom Home manages the entire addition permitting process, including structural engineering review, plan submittal, and inspection coordination. Our experience with Cupertino’s requirements helps keep the approval process on track.
Pricing for Home Addition in Cupertino
Home addition costs in Cupertino typically run $400-$600 per square foot, similar to new construction pricing. Second-story additions may cost more due to structural reinforcement requirements. Custom Home's Phase 1 design process locks in exact pricing before construction begins.
Cupertino Permit Requirements
Cupertino's Community Development Department handles residential building permits. Plan review for new construction typically takes 4-6 weeks. The city offers counter permits for minor projects and requires design review for homes in the Monta Vista hillside area. Online permit tracking is available through the city's portal. Custom Home manages the full addition permitting process, including structural engineering review.
Home Addition in Cupertino: FAQ
How much does a home addition cost in Cupertino?
Home additions in Cupertino typically cost $400-$600 per square foot. A 400 sqft room addition generally ranges from $160K to $240K. Second-story additions may cost more due to structural reinforcement. Custom Home locks in exact pricing during Phase 1.
How long does a home addition take in Cupertino?
Home additions in Cupertino typically take 6-12 months from design to completion. Second-story additions require 8-14 months due to additional structural work. Custom Home's design phase ensures construction runs efficiently and on schedule.
Can my Cupertino home support a second-story addition?
Most homes can be structurally reinforced for a second story. Custom Home's engineering team evaluates your foundation and framing during Phase 1 to determine what modifications are needed and includes those costs in the itemized scope.