5 guides on regulations for ADU and DADU projects across the Puget Sound region.
Before you can price a project, you need to know how much house you're allowed to build. Here's what Washington's HB 1337 requires cities to permit for ADU size, height, and setbacks, and how to confirm the exact numbers for your lot.
Read More →For most of Massachusetts, adding a backyard cottage or in-law suite used to mean a special permit, a public hearing, and a real chance of rejection. The Affordable Homes Act ended that. Here's what changed, what you're now allowed to build, and what it costs.
Read More →For decades, building a coach house in Chicago was effectively illegal. That changed on April 1, 2026, when the city's permanent additional dwelling unit ordinance took effect, opening backyard and basement units to a majority of the city for the first time since the 1950s.
Read More →House Bill 1337 is the most significant piece of ADU legislation Washington state has ever passed. Signed into law by Governor Jay Inslee in May 2023, this bill fundamentally reshaped the rules around accessory dwelling units across the state.
Read More →Seattle has become one of the most ADU-friendly cities in Washington state, but the permitting process still involves multiple steps, specific requirements, and real costs. If you're planning to build an ADU or DADU in Seattle, here's a clear breakdown of what to expect.
Read More →Get free quotes from top-rated ADU builders in the Puget Sound region.
Get Free Quotes →