About Diamond Pier

There has to be a better way...

It was this thought that inspired the invention of the Diamond Pier Foundation System. If you’ve ever spent an entire day digging holes in the hot sun or freezing cold, or tried to dig post holes in a sandy beach terrain just to have the holes collapse, or had a project delayed waiting for a hole inspection, then you’ve probably had this same thought. 

There has to be a better way...

Diamond Pier IS that better way. Based on time-tested spread pile technology, the Diamond Pier uses the strength of a precast concrete head to lock in 4 weight bearing, galvanized steel pins that transfer your load to a larger area of undisturbed soil than the traditional concrete footing. Functioning like tree-roots, this spread pile technology is fast, smart, low-impact, and sturdy. The pins can take only minutes to drive in, saving the contractor days of labor, and there is no waiting around for a hole inspection, as the Diamond Pier is inspected by simply running a measuring tape down the pipe after installation. 

The Diamond Pier has had years of extensive 3rd party testing and ICC evaluations, and has been used by Local, State, Federal and International Agencies for over 25 years on some of their most demanding projects. The Diamond Pier has the strength, reliability, and ease that you need for your business. No heavy machinery, no waiting for a certified installer since you can install the Diamond Pier yourself. 

Are you ready to save days on your projects? 

Diamond Pier

Our Mission...

To go beyond the standard standard; providing innovative, low-impact foundation solutions that benefit the builder, homeowner and the community while providing our customers, vendors, employees and affiliates with the highest level of quality and integrity.

Our Company Promise...


The Diamond Pier is manufactured to the highest quality standards.


Pin Foundations Inc. defines the value of our company by the level of our integrity.



Pin Foundations prides itself on providing excellent, hands-on customer service.


Over 25 years as a family-owned business with proven success in the field.

Beyond The Standard

Our proven quality, service, and integrity allow you to Build Beyond the Standard

Code CompliantWe have invested in the highest standards of code compliance documentation, providing testing certifications through the ICC-ES evaluation services program with our published ESR-1895 code compliance document. The Diamond Pier DP50-50” & DP75-63” are 100% code compliant to the 2006, 2009, 20012 and 2015 IRC code. PFI has a proven history of field performance in a wide range of low-impact foundation systems used in the most innovative building applications. Our innovation and dedication to quality allows you, the builder, to build with confidence and know that your project rests on a solid foundation.

Based in Gig Harbor Washington, Pin Foundations, Inc. provides foundations solutions via two separate platforms. (1) Site Specific Engineered Solutions for projects that are beyond the scope and limitations defined for the DP50 & DP75 models. (2) Pre-engineered DP50 & DP75 models that are sold through retail stores

Are you ready to build beyond the standard?

Let us know what you’re working on.