ADU/DADU Archives | Haas Development & Construction

Seattle DADU build by Haas Development DADU exterior.

ADU/DADU

What Washington’s Middle Housing Updates Mean for Seattle Property Owners

New middle housing legislation in Washington state is making it easier for property owners to…

haasbuildingMay 12, 2025

ADU/DADU

Certified ADU & DADU Specialists: Expert Planning, Design & Construction for Your Property

When building an ADU or DADU, experience and expertise matter. At Haas Development & Construction,…

haasbuildingMarch 24, 2025

Seattle DADU by Urban Cottage and Haas

ADU/DADU Update

Haas Development and Construction Acquires Urban Cottage

We are happy to announce that after 3 years as the exclusive custom contractors for…

haasbuildingJune 27, 2024