Blower Door Testing in Tacoma
Third-party testing for Tacoma new homes, DADUs, and infill
Tacoma builders and homeowners use blower door testing for new construction final, remodel permits, and air-leak diagnosis when rooms feel drafty. We test single-family homes, townhomes, and small commercial spaces across Tacoma and the Tideflats corridor, with results and photos delivered the same day when possible. Book from Sumner — free travel within 20 miles, then $1.75/mi.
Tacoma is building differently than it did a decade ago. Backyard DADUs, duplexes, and new infill homes are going up in established neighborhoods from the North End to South Tacoma, Hilltop, and the East Side, and the city's recent zoning changes for "middle housing" are opening more lots to small multi-unit projects. Nearly all of that new construction has to meet Washington State Energy Code air leakage requirements. WA Blower Door provides third-party testing for Tacoma homes and small residential buildings, with written results for your builder and your inspector.
Testing for Tacoma permits
Permitted through Tacoma Planning & Development Services
Tacoma projects are permitted through Tacoma Planning & Development Services. If your plan-review comments or permit conditions call for air leakage testing, book a test once the home is ready (see the checklist below). We test single-family homes, DADUs, and attached ADUs. For duplexes, townhomes, and small multifamily, we can talk through how each unit or building will be tested. Call us at (253) 802-8738 with your plans. Larger buildings may fall under our Commercial Testing service.
Infill and DADU challenges
Small units, big impact
In a 600–900 sq ft DADU, a single unsealed plumbing chase or attic hatch can make a big difference in the result.
Tight sites
Tell us about access and parking ahead of time, such as alleys, shared driveways, or a unit behind the main house.
Shared walls and older-home additions
Walls and floors between attached units need careful sealing. Additions in North End and Proctor-area homes often connect to framing that's 80–100 years old, and the tie-in is where leaks hide.
Tacoma FAQ
Common questions from Tacoma builders
Do you test homes in University Place, Fircrest, and Lakewood? Those are separate jurisdictions, but yes, we test throughout the Tacoma area. See the city list on our homepage.
Can you test before drywall? A pre-drywall check can help find big leaks while they are easy to fix. Ask when you book.
More resources: Pierce County testing, Sumner testing, and Build Sherpas energy code documents.