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Tier 2 checker

Last updated · Checked against primary sources

Short answer

How do I know if my building is Tier 2?

Add up the nonresidential, hotel, motel and dormitory floor area, leaving out parking. More than 20,000 and up to 50,000 gross sq ft is Tier 2; over 50,000 is Tier 1. Multifamily buildings over 20,000 sq ft are Tier 2 at any size. Federal and tribal-owned buildings are not covered. The checker below applies these rules.

Key factsChecked November 11, 2026

Tier 2, nonresidential
More than 20,000 and up to 50,000 gross sq ft, excluding parking RCW 19.27A.200
Tier 2, multifamily
Over 20,000 gross sq ft; 50,000 and over is still Tier 2 RCW 19.27A.200
Multifamily means
Sleeping units, or more than five dwelling units, mainly permanent occupants RCW 19.27A.200
Not covered
Federal and tribal-owned buildings Commerce Tier 2 page
Floor area
To the outside of exterior walls; outside bays and docks excluded RCW 19.27A.200

Is my building Tier 2?

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Enter the floor area and use.Without JavaScript, use the four-step test.

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A screening, not a determination. Based on RCW 19.27A.200 and Commerce's Tier 2 page as of November 11, 2026. Measure gross floor area to the outside of the exterior walls; leave out parking, outside bays and docks.

How it decides

ResultWhen
Likely Tier 2Nonresidential, hotel, motel and dormitory space totalling more than 20,000 and up to 50,000 sq ft; or multifamily over 20,000 sq ft, any size.
Likely Tier 1Nonresidential, hotel, motel and dormitory space over 50,000 sq ft.
Likely not covered20,000 sq ft or less; residential with five or fewer units; federal or tribal-owned.

Parking garages are left out of every total. For mixed-use buildings it adds the commercial and apartment areas, and treats more than 50,000 sq ft of commercial space as Tier 1. Edge cases, such as condominiums and connected structures, are in the Is my building Tier 2? guide.

What it does not do

  • It doesn't look up your building or check Commerce's list. To see whether Commerce has the building on file, use the Tier 2 Data Pool in the Clean Buildings Portal.
  • It doesn't store or send anything you type.

Want it done for you?

Send the address and floor area. We confirm coverage, estimate the incentive and quote a flat fee per building.

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Reply within 1 business day. No call required.