ADU & Additions · NE Portland 

Backyard Cottage - Built in 89 Days

ABOUT THIS PROJECT

A 120-Year Old NE Portland Craftsman Bungalow

This approximately 800 sq. ft. detached additional living space was thoughtfully designed as a cost-effective alternative to traditional ADU construction while still maintaining exceptional craftsmanship and architectural character that complements the original home.

To maximize efficiency and reduce unnecessary costs, we removed a 100-year-old garage while preserving approximately 500 sq. ft. of the original slab foundation, which remained in excellent condition. By utilizing the existing foundation, the project avoided additional demolition and concrete permit costs, streamlining both the timeline and budget.

THE BUILD

A Craftsman Cottage Built for Three.

Designed to blend seamlessly with the existing residence, this craftsman-style ADU sits in a park-like backyard setting — purpose-built to allow three sisters to live together on the same property while maintaining their privacy and independence. 

This home features:

  • A spacious bedroom
  • Walk-in closet
  • In-unit laundry room
  • Full kitchen
  • Open-concept living area
  • Vaulted ceilings throughout

Completed in 89 days from Start to Finish

Project Photography.

★★★★★

"After a horrible experience with an unprofessional engineer, we finally got plans approved by the city to convert our garage into an accessible ADU for my elderly parents. Joe picked up the project, and did an amazing job correcting the mess he was given. His team fixed multiple issues with the original plans, negotiated with the city, and spent tons of time chatting with my very particular parents to try to make their home just the way they wanted it. Their “cottage” is gorgeous, and I only wish we had known about Joe and used his team from the beginning."

Alex Lanham

More Projects.

Design-Build Custom Home Portland | De Marco Builders

May 14, 2026

Whole Home Remodel in NE Portland | De Marco Builders

May 14, 2026

Backyard Cottage ADU Built in 89 Days | De Marco Builders

May 14, 2026

Ready to Build Something
You'll Love?

Get a free consultation with our team — no commitment, just a conversation about what's possible.