Services

Home Additions & New Construction in Renton, WA

More Space, Built Right — From Foundation to Final Walkthrough

Running out of room doesn't mean you have to move. A well-planned addition adds the space your family needs and the value your property deserves — but only if it's engineered, permitted, and built correctly from the ground up.

J. Jensen Enterprises manages home additions and new construction projects from initial design coordination through permitting, framing, and finish work. We work directly with architects and structural engineers when a project calls for it, so every addition is sound before the first stud goes up — not just code-compliant on paper.

What we handle:
- Room additions and second-story builds
- In-law suites and multi-generational living spaces
- Garage conversions and structural expansions
- Permit coordination and inspection scheduling
- Design-build coordination with licensed architects and engineers
- Full project management from foundation to final finishes

Why it matters: An addition touches your foundation, your roofline, your electrical, and your structure all at once. Get any one of those wrong and you're not looking at a punch-list item — you're looking at a rebuild. We plan every addition with the same standard we'd want for our own home: nothing gets covered up until it's been checked, and nothing gets signed off until it's actually right.

Reviews

out of 5 stars
Justin and his team were there for us every step of the way from the start of a big leak to the repair and upgrade since they were already here!
Mary Bunce Home Service
Google
out of 5 stars
J. Jensen came out at last minute and removed a wall and installed a beam during a kitchen remodel. I am around new construction builds all the time. He has the quality of someone building $1,000,000 homes!
Paul F Mackay Jr Home Service
Google
out of 5 stars
We hired Justin to remodel our guest/kids bathroom, and they did an absolutely first-class job! The entire project was completed in a timely manner, and the results exceeded our expectations. What stood out most was their quality craftsmanship and attention to detail, every part of the remodel was done with care and precision. Justin and his crew were professional, reliable, and easy to work with throughout the entire process. We’re thrilled with how everything turned out and are already excited to start our next project with him and his team. I would highly recommend Justin to anyone looking for top quality work!
Lauren Schoenrock Kitchen Renovation
Google
out of 5 stars
The J. Jensen team was very knowledgeable and professional. The work was done in a timely manner. The job site was cleaned up daily. We are very pleased with the experience and the final product.
Charter Rep Bathroom Renovation
Google
out of 5 stars
Justin and his team renovated my master bathroom giving us a high quality update. He is always pleasant, patient and professional working with us. One example I'd like to highlight is with a part of our initial shower wall panel installation which looked acceptable to me. His team thought it was not aligned enough and redid their work to make it perfect. This shows that he wanted their remodeling projects to be so good that I would recommend them to others so I am doing so!
Phil W Bathroom Renovation
Google
Brand Logo liked our work? Leave Us a Review

Service Areas

Proudly Serving Renton, Seattle, Tacoma, Bellevue, Kent, Bryn Mawr-Skyway, Tukwila, Fairwood, SeaTac, Mercer Island, East Hill-Meridian, Burien, West Lake Sammamish, Issaquah, Covington, DesMoines, City of Sammamish, Maple Valley, Federal Way, Sammamish, Auburn, Kirkland, Redmond & Surrounding Areas

Ready to get started? Book an appointment today.