Seattle ADU Fees: Permit, Sewer Capacity and Utility Charges
Seattle ADU fees: SDCI permit fees, King County’s sewer capacity charge, SPU development charges and pre-approved plans.
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ADU Cost in Portland: SDCs, the 10-Year Waiver and Permit Fees
Portland ADU cost: FY 2026-27 SDCs, the 10-year short-term-rental waiver and permit fees, with what to budget.
The Cheapest Way to Build an ADU Without Cutting Corners
Cheapest way to build an ADU in California: convert space, stay under fee limits, use pre-approved plans, keep utilities short.
ADU Design Cost: Architect vs. Pre-Approved Plans
ADU design cost: what architects, designers and pre-approved plans charge, how fees work, and how to choose for your lot.
Hidden ADU Costs and Utility Hookups: Sewer, Water, Electric and Agency Fees
Hidden ADU costs: sewer, water and electric hookup ranges, site conditions, agency fees and a worked example.
ADU Budget Breakdown: Three Sample Budgets and a Line-by-Line Framework
Three sample ADU budgets (400, 600 and 800 sq ft) with the arithmetic shown, plus the five budget blocks and what to ask each bidder.
How Much Does an ADU Cost in California? 2026 Ranges by Type and Size
ADU cost in California: the 2021 owner survey median, 2026 builder ranges by type and size, and why per-foot prices mislead.
Owner-Occupancy Rules for ADUs: Key States Compared
Owner-occupancy rules for ADUs: which states bar them? Compare California, Washington, Oregon, Colorado, Arizona and more.
Arizona ADU Law: What Cities Must Allow Under HB 2720
Arizona ADU law (HB 2720) requires larger cities to allow an attached and a detached ADU. See sizes, setbacks, parking, rentals and fees.
Unpermitted ADU in California: How to Legalize It Under AB 2533
Unpermitted ADU in California: built before 2020 without a permit? AB 2533 lets you legalize it. See who qualifies and how it works.