427 Architecture

427 Architecture

Your Trusted Partner For Technical Projects

Founded in August 2022, 427 Architecture (Four Twenty-seven Architecture) specializes in delivering exceptional service for healthcare facilities (OSHPD 1, 2, & 3), K-12 schools, industrial spaces, and specialty commercial interiors. 427 Architecture routinely serves facilities in Sonoma, Napa, Lake, Mendocino, Humboldt, San Francisco, and Solano counties and is a California Certified Small Business (SB Certification #2033645).

High-Quality Every Time
427 Architecture takes a different approach to project delivery; we front-load the design with an in depth study of your systems then drive to permit submission with high-quality construction documents. Each project is looked at with individual needs, appropriate stakeholders, budgets, and time frames; each playing a key-role in development of the best solution.

We take the lead on projects in a small group round table approach where everyone gets a chance to contribute, and then drive to consensus decisions when possible. We approach project design and documentation through multiple vantage points including the Owner’s needs, user’s work flow, convenient maintenance access, and contractor’s ability to effectively construct the project.

Our Difference: Streamlined Efficiency
We combine meticulous attention to detail with a deep understanding of regulations and approval processes. We work closely with agencies like HCAI (formerly OSHPD), DSA, and city/county departments to ensure your project meets all requirements.

This overall approach works to minimizes surprises during construction and pricing, leading to a smoother overall experience. We believe in thorough project scoping to deliver clear and concise information.

427 Architecture prioritizes taking on projects that Jason Weaver can personally lead in design and actively manage. Our commitment to quality applies to projects of all sizes as we utilize the same rigorous quality control procedures regardless of scope.

427 Architecture

The Inspiration Behind Our Name:

427 is derived from the 427 cu in the big block V-8 motor of the 1960’s AC Shelby Cobra and GT-40; Jason’s long time favorite cars. When naming the firm, Jason sought to instill the essence of high performance in a small and agile service team.

Recent Projects


Sonoma Valley Hospital
PT Expansion Tenant Improvement

SoHum Health
Primary Care Clinic Tenant Improvement

St. Anns Home (SNF)
Industrial Dryer Anchorage

SoHum Health
FREER F-9 Smoke Door Replacement


Forestville Union School District

Forestville Union School District
Auditorium Refresh

Forestville Union School District
Gymnasium Floor Replacement

Forestville Union School District
Drinking Fountain Upgrades

Other Commercial

Veterinary Urgent Care
Tenant Improvement

Regional Parkway
Post Cannabis Remediation

Apartment Complex
Freestanding Metal Carports Installation

SR American Little League
Batting Cage

Meet Jason Weaver, AIA

Your Project Leader

Jason Weaver, AIA, leads 427 Architecture with a passion for guiding your technically focused projects. He brings over 20 years of experience as a licensed California Architect (#C 35544) and a Class A Certified Hospital Inspector (#A21166).

Jason possesses a natural talent for technical details and construction sequencing. His background in construction informs his hands-on management style and commitment to continuous learning.

Jason’s extensive knowledge covers various disciplines, including structural and MEP systems, enabling him to effectively review consultant work. He serves as the primary point of contact throughout the design and construction phases, leading the design team and managing project delivery. He also takes responsibility for site design, element development, building penetration details, and miscellaneous items not covered by other disciplines. He firmly believes in thorough project scoping to deliver clear and concise documents.

Prior to establishing 427 Architecture, he served as Senior Project Manager and Senior Architect for a handful of large and complex commercial developments in the region.


427 Architecture

Jason Weaver, AIA, Principal


[email protected]

Mailing: PO Box 644, Windsor, CA 95492

Office: 3450 Regional Parkway, Suite B1,
Santa Rosa, CA, 95403