Building Northern California with Precision and Integrity
CA State License #1124520
Commercial Construction
We bring function and professionalism to every square foot. Our commercial services focus on efficiency, safety, and long-term durability.
Residential Construction
From concept to completion, we deliver custom homes, additions, and remodeling projects tailored to your lifestyle and budget. Whether you’re planning a dream kitchen or a whole-house transformation, our team ensures every detail reflects your vision.
Remodels & Renovations
Transform outdated or inefficient spaces into fresh, functional, and modern environments.

Full Builds & ADUs
We handle complete construction projects including standalone homes and ADUs, giving homeowners more space and flexibility—whether for rental income, multigenerational living, or creative studios.
- Ground-up construction
- Garage conversions
- Detached ADUs
- Modular builds
- Permitting & planning support
- Multi-family apartments and duplexes
Our Best Projects
Innovative Designs, Timeless Impact: Our Latest Architectural Endeavors

Commercial Construction
We bring function and professionalism to every square foot. Our commercial services focus on efficiency, safety, and long-term durability.
Office buildouts
Retail & storefront construction
Medical & dental offices
Educational & institutional spaces
Restaurant & hospitality spaces

Residential Construction
From concept to completion, we deliver custom homes, additions, and remodeling projects tailored to your lifestyle and budget. Whether you’re planning a dream kitchen or a whole-house transformation, our team ensures every detail reflects your vision.
- Custom homes
- Room additions
- Interior/exterior renovations
- Kitchen & bathroom remodels
- Outdoor living spaces

Tenant Improvements
Make your leased or commercial space work for you. Whether you’re updating for a new tenant or rebranding, we manage everything from demolition to the final finish.
Floorplan modifications
- Floorplan modifications
- Electrical and plumbing upgrades
- Interior finishes
- ADA compliance adjustments
- Space branding and layout solutions
Our Clients
We’re proud to have partnered with industry-leading developers and organizations across Northern California.





Why Choose Westphalen?
Your goals become our blueprint.
Licensed & Insured
Detail-Oriented Craftsmanship
Locally Owned & Operated
Client-First Communication
Proven Track Record with Top Developers
On-Time & On-Budget Delivery


