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Planning ADU Guides

5 guides on planning for ADU and DADU projects across the Puget Sound region.

Planning

Prefab vs. Site-Built ADUs in Washington: Which Is Right for You?

Once you've decided to build an accessory dwelling unit, the next big fork in the road is how it gets built: manufactured off-site and craned into place, or framed stick-by-stick in your backyard. Each path has real trade-offs in timeline, cost, and flexibility.

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Planning

Does Building an ADU Raise Your Property Taxes in Washington?

Right after cost and timeline, most homeowners ask the same question: will an ADU spike my property taxes? Here's how Washington assessors treat new construction, what really changes on your bill, and where to get a real number.

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Planning

How Long Does It Take to Build an ADU in Washington?

Most Washington homeowners underestimate the calendar, not the budget. Here's a realistic phase-by-phase timeline for an ADU, from first drawings to final inspection, and what actually controls the pace.

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Planning

How Much Does an ADU Cost in Washington State? (2026 Guide)

One of the first questions every homeowner asks when considering an accessory dwelling unit is: how much is this going to cost? The answer depends on the type of ADU you're building, your location in Washington state, the size and finishes you choose, and your site conditions.

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Planning

How to Budget for Your ADU Project

Building an accessory dwelling unit is a significant investment, and getting your budget right from the start can mean the difference between a smooth project and a stressful one. Whether you're planning a basement conversion or a new backyard cottage in the Seattle-Tacoma area, here's a detailed breakdown of the costs you should plan for.

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