Leavenworth Building Department

WSEC-R 2021 energy code compliance resources for builders and contractors in Leavenworth, Chelan County.

Building Department

Leavenworth Development Services

Phone: (509) 548-5275
Address: 700 Highway 2, Leavenworth, WA 98826
Hours: M-F 9am-4pm
Email: don@cityofleavenworth.com
Website: https://cityofleavenworth.com/city-government/development-services/

Last verified: 2026-04-19

These apply at Chelan County County level — verify city-specific items directly with Leavenworth Development Services.

Chelan County: Chelan County has high-volume Short-Term Rental code requirements and separate garage submittal handouts — request STR-specific materials if the project involves a rental unit.

Code environment

Climate Zone

CZ5

Eastern WA — stricter insulation and air sealing minimums apply.

Radon Zone

Zone 2

Moderate potential — mitigation recommended.

Ready to check your compliance?

wsec.ai generates a complete R406 credit summary you can submit with your permit application to Leavenworth Development Services.