Updated: Mar 29, 2026
Location and Projects
Address
1242 Upper Happy Valley Rd, Lafayette, CA, 94549
Use our bidding system to
request a quote
Thorn Architects Photos
Thorn Architects
The principals of Thorn Architects are LEED Accredited and Certified Green Building Professionals. Their expertise includes additions, whole-house remodels and custom home design. Their practice incorporates sustainable design and green building materials and techniques into each project. They have extensive experience in renewable energy technology including photovoltaics, wind systems and micro-hydro for both interconnected and off-grid applications.
Thorn Architects has been been designing and building projects in the Bay Area and Monterey Peninsula for over 25 years.
From BuildZoom: Thorn Architects, 1242 Upper Happy Valley Rd, Lafayette, CA (Owned by: Thorn Melissa Rohrer) holds a General Building, General Engineering, Tree Service license and 1 other license according to the California license board.
Their BuildZoom score of 113 ranks in the top 3% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Thorn Architects, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Thorn Architects Services
Start a project today:
Thorn Architects Contact Information
Phone Number: (925) 283-4949
Address: 1242 Upper Happy Valley Rd, Lafayette, CA 94549
Thorn Architects Lafayette
Quality
113
97th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Thorn Architects has a BuildZoom score of 113, which places them above 97% of 336,931 contractors in California.
Activity
|
3 projects
|
2023 |
Our building permit records indicate that Thorn Architects has worked on at least
3.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Pricing
|
2 projects
|
$100k-$250k |
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Remove brick chimney and brick apron and repair dry rot. remove and replace/add windows relocate main electric panel meter mast weatherhead and service drop remove siding repair dry rot install new siding remove non-bearing interior closet walls; construct new clothes closet
Valuation:
$15,000
Permit #:
BISUB22-02991
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Construct a detached 1199 sf adu *** building shall comply with 2019crc sec. r337 for wui exterior construction methods and materials ***
Valuation:
$175,000
Permit #:
BIR22-009853
Status:
issued
Fee:
$10,996
Permit Type:
N/A
Building Type:
N/A
Remove approximately 90 linear feet of 4 high wood retaining walls and replace with approximately 90 linear feet of concrete retaining walls with heights ranging from 3 to 6
Valuation:
N/A
Permit #:
BISUB22-00780
Status:
triage
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remove and replace existing 1:12 with 7:12 roof. interior remodel. window and door replacement
Valuation:
$150,000
Permit #:
BISUB22-04272
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Building/residential/crc/recreation conditioned building
2022-03-03
599 sf detached accessory building to be used as conditioned gym recreation
Valuation:
N/A
Permit #:
BICRC22-002269
Status:
filed
Fee:
$5,292
Permit Type:
N/A
Building Type:
N/A
(rbc) - building residential combo alteration- 1 & 2 unit residential (building)
2021-09-23
To construct 527 sq ft. addition to convert laundry room to unconditioned sun room and conversion of crawl space are to garden room (unconditioned space) at rear of existing single family dwelling. to include windows and sky lights and mep s (water heater etc)
Valuation:
$45,000
Permit #:
RBC1902312
Status:
complete
Fee:
$3,800
Permit Type:
N/A
Building Type:
N/A
Construct a detached 1199 sf adu
Valuation:
$175,000
Permit #:
BISUB22-02403
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
599 sf accessory building used as conditioned gym recreation
Valuation:
$75,000
Permit #:
BISUB22-00169
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Transform 1229 sf detached non-compliant garage to 515 sf adu w 714 sf garage **** ntc - rf20-00737 ****
Valuation:
$25,000
Permit #:
BISUB21-01127
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Construct an approx. 373sqft one-story addition to expand existing great room. interior remodel to addition a new powder room on first floor remodel laundry room remodel first floor bathroom remodel and reconfigure master bathroom remodel and reconfigure kitchen new electrical new windows removal of walls per plans
Valuation:
$175,000
Permit #:
B22-2564
Status:
final
Fee:
$5,966
Permit Type:
N/A
Building Type:
N/A
Demolition of an existing 172 square foot bedroom/bathroom to be replaced with new 442 master bedroom/bathroom addition at exisiting 2 400 square foot single family dwelling to result in a 2 670 square foot structure. 04/04/2013 revision: remove and replace 36 linear feet of concrete retaining wall. 9/19/2013 revision: relocation of gas: electric meters only
Valuation:
$67,679
Permit #:
12CP00707
Status:
final
Fee:
$3,327
Permit Type:
N/A
Building Type:
N/A
Building new 2nd story front attached deck off living room (140 s.f.) with 2 new patio type doors - drx140998 also replaced door and 2 windows at top floor master bedroom
Valuation:
$68,000
Permit #:
RB1402821
Status:
final
Fee:
$2,768
Permit Type:
N/A
Building Type:
N/A
Remove and replace existing 1:12 with 7:12 roof. interior remodel. window and door replacement
Valuation:
$150,000
Permit #:
BIAL23-000054
Status:
issued
Fee:
$3,645
Permit Type:
N/A
Building Type:
N/A
(re) - electrical - 1 & 2 unit residential (building)
2015-01-26
Electrical to building new 2nd story front attached deck off living room (140 s.f.) with 2 new patio type doors - drx140998 also replaced door and 2 windows at top floor master bedroom
Valuation:
N/A
Permit #:
RE1402115
Status:
final
Fee:
$163
Permit Type:
N/A
Building Type:
N/A
320 square foot addition for study and master bathroom remodel guest bathroom replace kitchen cabinets remove non-bearing wall between kitchen and dining room dry rot repair and re-roof from wood shakes to composition shingles and addition of gable at entry for an existing single family dwelling revision 3.24.11: remodel 80 sq ft (e) bathroom & addition laundry sink @ garage revision ... see more
Valuation:
$250,000
Permit #:
10CP01067
Status:
final
Fee:
$2,730
Permit Type:
N/A
Building Type:
N/A
Permit value$68k building new 2nd story front attached deck off living room (140 s.f.) with 2 new patio type doors - drx140998 also replaced door and 2 windows at top floor master bedroom
Valuation:
N/A
Permit #:
RB1402821
Status:
PERMIT ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Electrical to building new 2nd story front attached deck off living room (140 s.f.) with 2 new patio type doors - drx140998 also replaced door and 2 windows at top floor master bedroom
Valuation:
N/A
Permit #:
RE1402115
Status:
PERMIT ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Building/residential/ad/single family addition
2014-04-11
432 sf adition: include an entry master bathroom breakfast nook and bathroom per plans
Valuation:
$129,600
Permit #:
BIAD14-002956
Status:
Issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace (e) skylights; addition (n) skylights
Valuation:
N/A
Permit #:
BISUB23-00268
Status:
triage
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remove slider and install window
Valuation:
N/A
Permit #:
BLDR-2016-05928
Status:
final
Fee:
N/A
Permit Type:
Remodel/repair (e...
Building Type:
N/A
Thorn Architects Reviews
BuildZoom hasn't received any reviews for Thorn Architects. Click here to be alerted when reviews are posted about them.
Verified License
BuildZoom confirmed this contractor's license
Thorn Architects License info
Verified License
| License # | 548798 |
| Status | Active |
| State | California |
| Type | General Building, General Engineering, Tree Service |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Thorn Architects at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | C29321 |
| Status | Active |
| State | California |
| Type | Architect |
| Business Type | Sole Ownership |
- BuildZoom has not verified this license since May, 2025.
Verify this license's status for Thorn Architects at the California Architect License Board.
This is a sample of licensing data; click here to access a complete history.
113
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
26
Permits
- Building permit records show that Thorn Architects has worked on 26 permitted projects.
Thorn Architects Employees
TR
Thorn Melissa Rohrer
Owner
WT
William R Thorn
Principal