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About MDK Construction, Inc

Serving Western Washington since 1995, MDK Construction, Inc is a general contractor serving a long list of commercial, industrial, institutional, public works, and residential clients. Beginning as a small family operation MDK has grown into one of the largest and most respected contractors in the area.  Our growth has been steady and well-navigated. The recent move to our new location has allowed us added efficiency with all our operations in one place.

MDK Construction Olympia Master Builders
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The MDK Team

Field Staff
Our field staff generally includes between 12 and 18 full-time tradesman and laborers, and one or two - . The majority of our current field staff has been with MDK for 5-20 years. We offer health care plan and retirement benefits to
all employees. As well as staff events at 4th of July and Christmas.

In addition to our full-time staff, MDK Construction counts our core subcontractors as important members of our team. We cannot place enough value on these relationships with other local contractors whose specialties allow us a level of flexibility, expertise, and manpower that is difficult to maintain in a full-time stable staff. These successful relationships allow us to successfully schedule and complete projects on time and on schedule with the quality MDK's reputation demands.


We maintain a database of over 100 subcontractors, vetted annually for licensing, insurance, and compliance with DOR, LNI, and Prevailing Wage requirements.

MDK office and management team has sophistication and professional experience and expertise to navigate and successfully execute the most complex contract requirements.

Management Staff

Michael Koidahl Owner,
President, and Co-Founder

Mike Koidahl started MDK in 1995 in partnership with his father, Donald and mother, Gloria. Mike took over
leadership of the company in 2014 and full ownership in 2017.  Mike's leadership creates a culture of excellence in service to our customers, and with deep commitment to our community. Mike presently serves on the Olympia Master Builders Board of Directors representing the Lewis County Branch.


Steve Barnett
Sales Manager

Steve joined MDK in 2012. He brings over 30 years of experience in construction management throughout West Coast. Beginning in construction as a General Superintendent, Steve has since served construction companies throughout the West Coast as Estimator, General Manager, Project Manager, Sales Manager, and Vice President. Steve holds numerous certifications in construction management and specialty software, always adding to his skill base in evolving processes and technologies.


Steve Barnett
Project Manager

Steve heads the project management team utilizing cradle-to-grave approach - from sales through project
completion with support of in-house Project Manager, Drafters, and Superintendents.

Ann Farner

With MDK since 2015, Ann brings over 25 years of experience with accounting, contract compliance and
administration, human resources, and professional construction office protocols and processes.

MDK Commitment to Safety

We take construction safety seriously here at MDK. Our Washington State Labor and Industry audited Safety
Manual and Accident Protection Plan provide comprehensive safety guidance to MDK staff, and are
constantly updated as conditions and state and national OSHA standards change.

Our Clients


Best Western
Butteville Lumber
Cascade Mental Health
Centralia Fur & Hide
Centralia Pet Resort
Chevron - Tower Centralia
Dot Help
Edward Jones
Fairway Center
Flintstone Mini Storage
Grants Towing
Great Clips
Harry Ritchies
High Valley Country Club
Innovative Sleep Centers
K&K Adventures
Kelly's Body Shop - Collision One
Kobo Teriyaki
Lewis County Driving School
Love's Travel
Lowes Flatbed Center
Mattress Firm
Newaukum Valley Golf
Olympia Veterinary Clinic
Pacific Mobil
Petsense LLC
Railroad Signal Services
Rodda Paint
Serenity Care
Shelton Structures, Inc
Spencer Properties
Spiffy Dine In Drive In
Stihl NW
SW Washington Dance Center
Tom Nicholas, CPA
Town Center Dental


Mega Machine Shop, Inc.
Briarwood Farms
Cascade Hardwood Group
Mega Machine
Wayne Dalton Overhead Door
Zev Technologies

Public Works

Centralia City Light
City of Centralia - City Library
City of Centralia - Community Development /Emil
Historic Fox Theater Restorations
Lewis County Facilities
Lewis County Fire District #2
Oakville School District
Tenino School District
Thurston County FPD17
Timberland Regional Library
Twin Transit
WA State Correctional Industries

Multi-Family & Real Estate

K&K Adventures
Capitol Lake Towers Condominiums
Century 21
Newaukum Valley Apartments
Point at Westport Condos
Realty World
Reliable Enterprises
West Coast MH Parks Inc


Chehalis Tribe
Boys & Girls Club of Chehalis
Church of the Nazarine
Serenity Care
Pope's Kids Place
The Salvation Army
WA State Dept of Health
DSHS / Green Hill School

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