C-NRPP · CRT-202884

Tianchen Zhang

Custom Build Standard Construction Corp.

Latest credential check on this page: October 13, 2026. Each record carries its own date. Canadian sources and verification.

Credential number: CRT-202884
Credential body: Canadian National Radon Proficiency Program (C-NRPP)
Status: Current in the source on October 13, 2026. Certification, not a provincial licence.
Valid through: July 1, 2027
Service: testing
City: Richmond Hill
Province / country: Ontario, Canada
Phone: (416) 820-7949
Official source: C-NRPP public finder · Check CRT-202884

Enter CRT-202884 in the official certification check and match the name and expiry before hiring. Certification belongs to the person named here.

Fig. 1 — Richmond Hill, approximate. Pin marks the official Canadian Geographical Names Database city reference point, not a business address or service area.

Map source: Natural Resources Canada — Richmond Hill. Contains information licensed under the Open Government Licence – Canada.

Radon testing in Ontario

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