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CATG is approved by the United Kingdom Accreditation Service as a certification body for the National Highways Sector Schemes (NHSS) Sector 4 - Preservative Treatment of Timber.

The Scheme is based on ISO 9001:2008 and focuses on the requirements for the preservative treatment of timber.

This Scheme is ideal for customers wishing to supply treated timber for highway and motorway contracts.

To identify any of our current, suspended or withdrawn NHSS4 certified establishments please contact Gail Sumner on 0044 (0) 1524 400632 or email her at

CATG at 0044 (0) 1524 400632 or 0044 (0) 7941 536543
CATG at 
Certification and Timber Grading Limited, 29a Princes Crescent, Morecambe, LA4 6BY
Use our contact form located here


Supporting CATG documents include:

Our introduction to the ISO standards