About Us

Slayden Constructors, Inc. is a leader in the construction industry. Slayden is built on strong values, hard work and a commitment to getting the job done right. The success of our company is best expressed through our efforts to provide a safe work place with respected employees and a committed management team. Our team approach to all our construction projects has provided steady growth in work volume, successful expansion of key management personnel, and an extensive list of satisfied clients for more than 30 years.

Strength through Experience and Knowledge

Through our unwavering dedication to customer service, we have become one of the most respected contractors in the Pacific Northwest. We target a mixture of key projects which adds to our strength through experience and knowledge, while keeping us competitive in multiple realms of the construction industry.

Our projects extend throughout a wide range of the construction spectrum from heavy civil to environmental construction. Our key markets include water/wastewater treatment plants, dams, fisheries, renewable energy/hydro, river restoration, transportation, new construction, and modernization of public works and commercial buildings.

Recently with Slayden

Slayden, now part of the Stantec Construction Group, has operated in the Pacific Northwest and northern California for more than 30 years as a leading project delivery contractor. With the ultimate goal of delivering maximum value to our clients and their local communities, we provide single-source, integrated construction services and the full range of project delivery methods.

Incorporating industry-leading preconstruction services and safety practices, our multi-disciplined team of construction professionals delivers a wide range of projects, with a focus on water, dams, fisheries, energy and transportation.

Join a team that’s advancing the growth in communities where we live and work. We are integrated program managers, engineers and construction experts with proficiencies derived from our network of global engineering experience and our self-perform capabilities as a leading project delivery contractor.

The Stantec Construction group consists of MWH Constructors and Slayden in the U.S. and Stantec Treatment in the UK.

Same Company – Same People

We are the same company, with more resources, and with the same dedicated team committed to providing you the highest level of service.

“Both MWH Constructors and Slayden have similar values and company cultures, which emphasize the success of projects based on strength of team, hard work and a passion for safety,” said Blair Lavoie, president of MWH Constructors and chief executive officer of SCI . “We are pleased to welcome the Slayden employees, who will continue to bring project delivery and construction excellence to our clients in the water, energy and transportation sectors.”

“This is a great opportunity where both firms and our clients benefit, and bring a broader set of expertise to the combined team. We have unlimited potential to grow within the Pacific Northwest and California, while expanding our core competencies,” said Greg Huston, president of SCI.

Our Services

Preconstruction Services

Planning and Coordination




Value Engineering




Construction Services

Project Controls

Subcontractor Outreach

Commissioning and Startup

Electronic O&M Manuals

Project Closeout

Risk Management

Project Management

Design Management



Alternative Delivery Methods


Construction Manager At Risk (CMAR)



Progressive Design-Build

Flexible Pricing Approaches

Other Services

Community Outreach

Small Business Participation


Core Ideology


To build great people, projects, and relationships.

Core Values

People Matter: We look after people unconditionally with character, honesty, and integrity.

Team Unity: We work as a team to exceed expectations while displaying loyalty and commitment.

Solutions Driven: We adjust positively to challenges encountered.

Future Focused: We make decisions with the long term in mind.

Serious About Safety

For over 30 years, we’ve dedicated ourselves to job site safety, and our track record of success speaks for itself.

Construct Your Future

Slayden is always looking for talented, experienced team players whether it be out on the field or in our corporate office. Start your future with Slayden by applying today!

Select Slayden Projects

Slayden is keeping busy! Check out our projects throughout the last 33 years.

Management Skills that Help Reduce Costs

"We have been impressed with their management skills, starting with preconstruction where they performed value engineering that reduced costs, lead procurement with detailed bid packages that brought our project qualified subcontractors and manufacturers and produced a schedule that would get our project completed on time. Slayden has continued this into the construction phase by managing the work to stay on schedule."

Randy Rosane, P.E., Project Manager with Water Environmental Services

Positive and Goal-Driven

"Slayden’s positive approach and eagerness to achieve the project goals was a tremendous benefit and a driving force to the project and its success. Slayden achieved all minority, woman, and emerging small business subcontracting goals and also met the 20% Workforce Training and Hiring Program’s apprenticeship requirements. They also held their subcontractors to these same goals and requirements."

Michelle Lostra, P.E., City of Portland, Water Bureau

Strong Communication and Community Outreach

"I feel confident in recommending Slayden for their approach to neighborhood outreach and desire to work with our community outreach and communications team to help keep neighbors informed, resolve issues and mitigate issues."

Katy Fulton, Lake Oswego – Tigard Water Partnership

Efficient and Safe

"I enjoyed their management style, which was efficient while paying attention to cost. This was done without sacrificing safety. I would welcome the chance to work with them in the future."

Daniel G Shepard, Manager, Grants Pass Irrigation District

Positive Relationship Builders

"Slayden has met all conditions of approval and does a great job of keeping the neighborhood informed. Slayden works diligently to accommodate the neighboring citizens. In several cases, Slayden has gone above and beyond the conditions of approval in an effort to solve citizen’s issues. This has led to the development of relationships between the project team and the neighborhood, which have contributed to the project in a positive manner."

Thomas Lebo, Construction Manager, Brown and Caldwell

Respectful, Courteous, and Safe

"Slayden Construction is true to their word, without a doubt I would hire them for future projects. All of the employees that worked at the plant were respectful, courteous, and preformed the duties at hand in a safe manner. I can’t say enough good things about Slayden, as you can see in this evaluation. Surround yourself with good people and it makes you look good. And it doesn’t get any better than Slayden Construction."

William Schmittle, City of Hermiston

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