Keystone Preservation is the most accredited surface cleaning company in the UK. Our ‘Excellence as Standard’ approach has seen us being awarded with ISO9001 2015, ISO14001 : 2015, OHSAS18001 : 2007 and PAS99:2012. Keystone Preservation is also proud of our industry accreditation’s DOFF and TORC Rosette Scheme, CHAS, Safe Contractor and our membership to The Guild of Master Craftsmen.
what makes us different
We specialise in stone cleaning and restoration using our Doff steam system.
Doff is a steam based surface cleaning system. It is unlike any other steam system and removes many different types of paint/dirt/biological matter without damage.