Updated: Apr 24, 2026
Location and Projects
Address
215 SUNNLYSLOPE AVE, Petaluma, CA, 94952
Use our bidding system to
request a quote
Underscore Design & Build Construction
Underscore Design & Build, 215 Sunnlyslope Ave, Petaluma, CA (Employee: William Weil Stark) holds a General Building license according to the California license board.
Their BuildZoom score of 96 ranks in the top 20% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Underscore Design & Build, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Underscore Design & Build Services
Start a project today:
Underscore Design & Build Contact Information
Phone Number: (216) 798-5858
Edit
Address: 215 SUNNLYSLOPE AVE, Petaluma, CA 94952
Edit
Do you work for this business? Unlock this free profile to update company info and see who's viewing your profile.
Underscore Design & Build Petaluma
Quality
96
80th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Underscore Design & Build has a BuildZoom score of 96, which places them above 80% of 336,931 contractors in California.
Activity
|
2 projects
|
2025 |
Our building permit records indicate that Underscore Design & Build has worked on at least
2.0 projects over the past year.
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.
Building Permits by Underscore Design & Build
This is a sample of this contractor's permits. Click here to access their complete permit history.
Residential remodel addition to a single family home consisting of converting the existing garage into living space complete with a family room storage area and master bedroom suite. remodeling the kitchen and adjacent areas to create an open floor plan revised laundry room and revised office. replacing the existing roof structure over the existing garage and a small addition on the b... see more
Valuation:
$210,000
Permit #:
BLDR-2024-0302
Status:
issued
Fee:
$8,110
Permit Type:
N/A
Building Type:
N/A
Addition on 225 sqft. to the rear of the house for new primary bedroom. turn one existing bedroom into
Valuation:
$150,000
Permit #:
B2025-0595
Status:
issued
Fee:
$6,484
Permit Type:
Residential
Building Type:
N/A
Similar Contractors See more
184
BZ Score
$60K
Avg Project
-
Projects
187
BZ Score
$30K
Avg Project
-
Projects
188
BZ Score
$30K
Avg Project
-
Projects
Underscore Design & Build Reviews
BuildZoom hasn't received any reviews for Underscore Design & Build. Click here to be alerted when reviews are posted about them.
Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Underscore Design & Build License info
Verified License
| License # | 1123585 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Underscore Design & Build at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
96
BuildZoom Score
Bonded
| Bonded Agent | This License Filed A Contractor's Bond With |
| Bond Value | $25,000 |
Underscore Design & Build Employees
WS
William Weil Stark
Rmo / Ceo / Pres