Thorn Architects

4.94 | 3 Verified Ratings
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1242 Upper Happy Valley Road
Lafayette, CA 94549
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Thorn Architects

Thorn Architects is a full service architectural design/build firm with projects in Napa Valley, SF Bay Area and the Monterey Peninsula.Our practice covers all aspects of residential architecture including new custom residential, additions, whole-house remodels, kitchen and bathroom design,custom cabinetry design and fabrication. We strive to synthesize form and use; site, structure and interiors result in an integrated whole. Each project is a unique reflection of our client's experiences and desires for their home. We are LEED Accredited Professionals and Certified Green Building Professionals. Thorn Architects values the fundamental elements of sustainability: aesthetics, longevity and materials.


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Service Area

  • Walnut Creek
  • Piedmont
  • Oakland
  • Pleasant Hill
  • Yountville
  • Concord
  • Alamo
  • Pebble Beach
  • Orinda
  • Diablo
  • Lafayette
  • See All >

Services Offered

Architects & Engineers
  • Architect

Areas of Expertise

  • New Construction, Whole House Remodels and Additions
  • Rehabilitation of Existing Structures/Structural Reconfiguration&Retrofit
  • Custom Casework/Cabinetry Design
  • Sustainable Design,Green Building, Renewables

Product Brands Used

  • Marvin, Pella, Kelleher

Quick Facts

Business Hours
9:00 AM to 5:00 PM
9:00 AM to 5:00 PM
9:00 AM to 5:00 PM
9:00 AM to 5:00 PM
9:00 AM to 5:00 PM
9:00 AM to 12:00 PM
9:00 AM to 12:00 PM
(Please call to confirm)
  • Warranty Offered
  • Free Estimates
  • Bilingual


In Business Since: 1988
Memberships & Affiliations
  • American Institute of Architects (AIA)
  • Carmel Art Association
  • US Green Building Council, LEED Accredited Professional
State Licensing
Trade: Architect
License #: C29321
Expiration: 05-31-2023
Green Certifications
  • - Certified Green Building Professional
  • LEED Certification for Individuals: LEED Accredited Professional (LEEDAP)
  • AIA Silver Medal
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Business Overview

Community Involvement

US Green Building Council-Northern CA Chapter

How We Got Started

We describe our business as Well established


Thorn Architects

My Work
1 Projects
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Ratings & Reviews
Thorn Architects

Real feedback from real homeowners.
Learn more about this pro by reading the ratings and reviews below.
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5.0   |  
Review by in Lafayette, CA
Although we did not embark on a project - the consulting part was excellent

2 of 2 users found this review helpful.

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5.0   |  
Review by in Concord, CA
William Thorn assisted me with the planning, design, and to be in contact with the roof engineer, trusses company contractor and much. All I did was to relax. I give William Thorn a 10+. Also, william will desing my kitchen. Im very glad to have William on my side.

3 of 3 users found this review helpful.

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4.83   |  
Review by in Martinez, CA
The finished plans we received exceeded our expectations by a mile. Bill Thorn understood what we needed, not what we wanted. His insights made us look at how we lived in our home and made suggestions that, we're sure, avoided an expensive mistake.

5 of 5 users found this review helpful.

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