Tenhulzen Construction offers ADU and DADU construction services in Washington State, providing pre-approved and custom plans. Options suit various budgets and timelines, with benefits including added property value and flexible living spaces.

Tenhulzen Construction – ADU Contractor in Mill Creek, WA

About Tenhulzen Construction

ADU and DADU Construction Services by Tenhulzen Construction

Washington State's House Bill 1337 has brought significant changes to how cities and counties under the Growth Management Act (GMA) regulate Accessory Dwelling Units (ADUs), including Detached Accessory Dwelling Units (DADUs). Tenhulzen Construction helps homeowners navigate these regulations and explore their options for building an ADU or DADU on their property.

Tenhulzen Construction offers two primary paths for homeowners looking to add an accessory dwelling unit: pre-approved plans and custom plans. Each approach has its own advantages depending on budget, timeline, and design preferences.

Pre-Approved and Custom ADU Plans

For those looking for a quicker and more cost-effective route, pre-approved plans offer a streamlined process. Homeowners in Seattle can choose from over 160 pre-approved plans, which can significantly reduce both permitting time and architectural costs. For properties located outside of Seattle, template plans can still provide meaningful savings on design and planning expenses.

Pre-approved plans are not entirely rigid — homeowners can personalize their selections by choosing from various architectural styles, materials, finishes, and color schemes. This allows for a degree of individual expression while still working within a structured framework.

For those who prefer greater design freedom, custom ADU plans are also available. This option involves working with architects and interior designers to create a detached ADU builder solution tailored to specific lifestyle needs, aesthetic preferences, and property characteristics. Custom plans do require more planning time and a longer permitting process, but they offer the flexibility to design an accessory dwelling unit that closely matches the primary residence.

Benefits of a Tailored DADU

Customizing a DADU to complement the existing home can offer several practical benefits:

  1. A cohesive visual aesthetic that enhances overall property appeal
  2. Potential increase in property value through consistent design
  3. A functional space that can serve as a guest suite, in-law suite, or rental unit
  4. A design that contributes to a harmonious look within the neighborhood

Whether the goal is to house extended family, generate rental income, or simply add usable space to a property, Tenhulzen Construction works to align the final result with the homeowner's specific needs. As an experienced ADU contractor in Washington State, they guide clients through both the design and construction phases of the project.

Tenhulzen Construction serves homeowners across the Seattle area and beyond, offering expertise as a detached ADU builder and accessory dwelling unit builder for a range of property types and project scopes.

Services

Tenhulzen Construction performs the following services

  • Architecture & Design
  • Permit Specialist
  • Construction
  • Finishing & Fit-out

Tenhulzen Construction Reviews

April Tran

2025-10-29
"Met with Roy to discuss a remodel of one of our spaces into an apartment. He was very knowledgeable and understood our goals. He was transparent about the scope of work and costs and provided a rendering of what it would look like. I really appreciated the professionalism and quickness to respond. Ill definitely be using them in the future."

Brent Marshall

2025-10-07
"Incredible experience working with Tenhulzen Construction from start to finish. I felt the crew treated our house like it was their own with deep attention to detail, cleanliness of the job site, and overall respect of the property. The team was very friendly, communicative, and easy to work with. I would absolutely work with Tenhulzen Construction for my next project."

Stacy Higgins

2025-07-18
"We have been so thankful for the guys at Tenhulzen - we had a water leak in our home when we were out of town. They graciously showed up the day we called while we were still traveling and began the cleanup and mitigation process. They worked with us to schedule the repairs conveniently for our family, and did a fabulous job. The damage was comprehensive - in the crawl space, in the bathroom, walls, flooring.... and their team handled it all. We are so happy with the results!"

Mikey

2025-03-18
"I have used the Tenhulzen group for over a decade. Amazingly, they still employ some of the same people that worked on my project 13 years ago. That says a lot about a company that can attract and keep talented people in an industry that is know for high turnover. I recently used both the painting and construction teams again with very good results. If you are looking for a job that is just quick, dirty, and cheap then this is not your group. However, if you are looking for a quality job that is completed to your satisfaction with knowledgeable and competent crafts people, then I can highly recommend the Tenhulzen team of folks."

Victoria Wellman

2022-04-13
"I am more than pleased with the interior painting and care Louis and his team took with painting several rooms in my home including 2 bathrooms, kitchen and others. The team was respectful of my home and the job was beautifully completed. When the job was completed, except for the beautiful paint job, you wouldn't know I had had any work done. All prep work was cleaned up, the leftover paint cans carefully labeled and stowed in my garage. I have had many painting and construction companies but never one this reliable with perfect workmanship. Oh - and when they said they would be at my house at 8:00 A.M., they all were not only on time, but early and ready to work! I highly recommend Tenhulzen for interior work - and I have hired them to paint the outside of my home once the weather cooperates so I am sure you will be hearing from me again. I give them a 10 plus on a scale of 1 to 10!!!"

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Specifics

Opening hours

Monday 8:00AM - 4:30PM
Tuesday 8:00AM - 4:30PM
Wednesday 8:00AM - 4:30PM
Thursday 8:00AM - 4:30PM
Friday 8:00AM - 4:30PM
Saturday -
Sunday -

Location

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