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"As a Realtor who has represented builders for many years I have come to know quality when I see it and WestTier is always a step above the average builder. So I chose to purchase my home from Jeanne in 2001 while representing one of her communities in Mukilteo and I still live in this fantastic home. The craftsmanship and attention to detail is unparalleled and I have had many compliments on the layout of the floor plan and the finishes even after 10 years. It is also nice to have a community of folks who purchased from me during that time and who are also STILL happy with their homes and have no complaints! What a realtors dream. I would highly recommend WestTier to anyone looking at a new home now or in the future. WestTier’s homes are a sound investment in any market."
Cathy Hartmann, Gladwell-Timberland Realty Group

Our Story

WestTier development has been a successful business since 1983 both developing land and building homes. The company is owned and operated by Jeanne Koruga and Peter Tiersma.

Since that time WestTier has grown into building speculative homes, custom homes and multifamily units. We feel this degree of diversity has allowed us to develop and grow into the highest quality builder and developer. With direct involvement through each phase of every project, we are dedicated to creating not only an exceptional home, but of building a lasting relationship with homeowners and real estate agents.

We are focused on providing our clients with unequaled quality, personalized service and extraordinary value.


Peter is of Dutch descent and was raised in Lynden, Washington. He has strong ties to the Friesian community in Holland and is active in the Dutch community. Peter began developing investment property and soon turned it into a lifelong career. His passion for saving trees and preserving the integrity of the original landowners’ ideas became Peter’s pinnacle of success.


Jeanne’s passion is building. Attention to detail and giving 100% on every project to both the homeowner and the real estate agent is a constant for Jeanne. Her integrity is an integral part of every project from the initial planning phases to completion.

Jeanne was born and raised in Seattle. She graduated from Seattle University with a degree in accounting. She worked as a CPA in public accounting for five years. She then turned her focus on WestTier and developed the building division. She has been managing both the building and accounting functions of the business from that point forward.

Living on a managed tree farm that grows FSC lumber, Jeanne is very involved in sustainable growth timber. As Chairman of the Forest Advisory Committee, Jeanne has graduated from the Forest Stewardship Program and participates in many tree farming activities. Working with the DNR, American Tree Farm Association, and Upper Puget Sound Farm Forest Association adds an additional commitment to give back..