Federal Way sits on the I-5 corridor between Tacoma and SeaTac, with frequent remodel and ADU permits that require energy-code blower door testing. WA Blower Door is the third-party tester — we don’t sell insulation or windows, so the report stays independent. Book online; travel from Sumner is free within 20 miles and $1.75/mi after.
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