Kathryn has more than 25 years of experience in real estate development and specializes in all aspects of land use consulting, permitting and entitlements for both commercial and residential projects.  

In addition to the land use and permitting services, Kathryn manages the day-to-day operations of the company.

She also currently represents District 7 on the Pierce County Planning Commission and is a licensed real estate broker with Windermere Real Estate Gig Harbor.

Mike has more than 40 years of experience in septic system design and installation and residential and commercial site development .  

Mike is a Washington State licensed on-site septic designer.  He applies his knowledge, experience and a no nonsense approach to design systems that are best suited for the site.  Mike provides wastewater engineering design services to both residential and small commercial projects.

About Us


With over 65 years of combined experience in all phases of site development, Harborstone Consulting, LLC  is qualified to handle your project from site feasibility through project completion.


Through our years of experience in the real estate development industry, Harborstone Consulting, LLC has developed excellent working relationships with architects, engineers, environmental consultants, land-use attorneys, land surveyors, contractors and other professionals who can be recommended as a member of a project team.

Mike Jerkovich

​​WA State Licensed On-Site Septic Designer

253-514-0958

​mjerkovich@harborstonellc.com

Kathryn Jerkovich

Principal

Land Use Consultant

253-363-0071

​kjerkovich@harborstonellc.com