Buckley and the Enumclaw Plateau often mean a bit more drive time from Sumner, but we still cover residential blower door testing for new builds, ADUs, and shops. Confirm your address when you book so we can quote travel (free within 20 miles of 16202 64th St E Ste 117; $1.75/mi beyond). Friday–Saturday slots fill first.
Ensure your home or business is energy-efficient and comfortable with our professional blower door testing services.
Providing third party blower door testing results for Washington State Energy Code (R402.4.1.2) air leakage testing compliance.


Trained on Retrotec equipment.

Precise and thorough testing.

Retrotec Equipment for accurate results.
Trust our trained staff to conduct thorough Blower Door tests to assess your building's air tightness and identify potential energy leaks.
Ensure your project meets energy code regulations with our approved third-party WA Energy Code testing services.
We can use our blower door and FLIR thermal camera to identify where leaks are coming through your building envelope.
Copyright © 2026 WA Blower Door - All Rights Reserved.
Our family: Dow Engineering, Build Sherpas. Same office in Sumner.
WA Blower Door, a tradename of Dow Engineering PLLC · 16202 64th St E Ste 117, Sumner, WA 98390 · (253) 802-8738
Dow Engineering PLLC