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Signet Testing Laboratories, Inc.

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Providing an Integrated Quality Experience for Over 55 Years

As the premier testing and inspection agency in Northern California, Signet's beginnings date back to 1966. Since then, we have provided our services on many of the iconic buildings, historic landmarks, and public works projects throughout the Bay Area and greater Northern California region.

The success of any great company, much like any building, can be found in its solid foundation. Signet promises to deliver top-quality services to ensure the success of your vision.

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Signet is subject and/or signatory to the International Union of Operating Engineers (OE3), AFL-CIO and will be able to satisfy any potential Project Labor Agreements.


Proud member of the Associated General Contractors of America (AGC).

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Non-Destructive Testing

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Laboratory Testing

Surveyors Equipment

Existing Building Surveys


Cañada College Kinesiology & Wellness Center 

San Mateo, CA
Owner: San Mateo County Community College District
Construction Value: $125M 

The CAN B1 New Kinesiology and Wellness Center is a Design-Build project consisting of the demolition of an existing athletics building (41,000 sf), followed by the construction of a new 85,000 sf structural steel building (home of the PE Department) with two swimming pools.


Signet provided special inspections and materials testing services on this project. Services included: Cast-In-Place Concrete, Shotcrete, Masonry, Structural Steel/Welding, Fire-Proofing, Post-Installed Anchors/Dowels, and Seismic Ceiling Anchors. The large exposed structural steel trusses and other steel members were fabricated in 10 different shops including the Bay Area, Oregon, Washington, and Idaho. Signet had at peak 1 Lead CWI and 4 additional inspectors, plus up to 14 inspectors in the steel fab shops.

Golden 1 Center Arena

Sacramento, CA
Owner: Sacramento Basketball Holdings
Construction Value: $380M

The Golden 1 Center is the new home of the Sacramento Kings, located in the heart of downtown Sacramento at the demolished Downtown Plaza Mall. Golden 1 Center is LEED Gold and was envisioned as an iconic multi-use Entertainment and Sports Center (ESC) that is an interactive “smart” building with the best in innovation and technology. The building frame consists of structural steel/braced frame construction, seats approximately 18,000 people, and has a total gross area of approximately 674,000 square feet. Special attention was given to the event floor with a single-ply waterproofing membrane, to secure a “bathtub type effect” at the mat slab.

Signet provided all on-site inspection and testing including Cast-In-Place Concrete, Shotcrete, Precast Concrete, Floor Flatness Testing, Concrete Unit Masonry, Structural Steel Framing, UT/NDT, Spray Applied Fireproofing, Waterproofing, and Roofing Applications. We had a team of inspectors including a Resident Inspector, four full-time inspectors, and five additional inspectors for peak periods of construction.

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Robert Tadlock, CEO

Quality relationships are the cornerstone of successful teams.  Here at Signet, we consistently strive to build meaningful relationships based on trust, accountability and aligned values towards common goals.

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Kenneth Harms, Senior VP

We are focused on delighting our customers with operational excellence. Becoming Best in Class is more important to us than being the largest firm.

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Carla Collins, VP

We are committed to providing an integrated quality experience that begins with collaboration among Owners, Construction Managers, Structural Engineers, and Contractors.

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