Home Addition in Monte Sereno
Custom Home builds home additions in Monte Sereno at $550-$800 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 Monte Sereno?
Home additions in Monte Sereno typically cost $550-$800 per square foot in 2026. A 500 sqft addition ranges from $275K to $400K. Custom Home's design phase locks in your exact cost before construction starts.
Why Expand Your Monte Sereno Home
Monte Sereno’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 Monte Sereno
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 Monte Sereno.
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 Monte Sereno Additions
Monte Sereno 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.
Monte Sereno Home Addition Permits
Monte Sereno’s planning and building services handle residential permits with a strong emphasis on design review. New construction requires approval from the city’s Architectural Control process, which evaluates building design, setbacks, and landscape plans. Plan review typically takes 4-8 weeks. The city contracts with Santa Clara County for building inspections.
Custom Home manages the entire addition permitting process, including structural engineering review, plan submittal, and inspection coordination. Our experience with Monte Sereno’s requirements helps keep the approval process on track.
Pricing for Home Addition in Monte Sereno
Home addition costs in Monte Sereno typically run $550-$800 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.
Monte Sereno Permit Requirements
Monte Sereno's planning and building services handle residential permits with a strong emphasis on design review. New construction requires approval from the city's Architectural Control process, which evaluates building design, setbacks, and landscape plans. Plan review typically takes 4-8 weeks. The city contracts with Santa Clara County for building inspections. Custom Home manages the full addition permitting process, including structural engineering review.
Home Addition in Monte Sereno: FAQ
How much does a home addition cost in Monte Sereno?
Home additions in Monte Sereno typically cost $550-$800 per square foot. A 400 sqft room addition generally ranges from $220K to $320K. 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 Monte Sereno?
Home additions in Monte Sereno 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.
Do I need to move out during a home addition in Monte Sereno?
For most additions, you can remain in your home during construction. Second-story additions may require temporary relocation during certain phases. Custom Home plans the construction sequence during the design phase so you know what to expect.