The company said the dual certification helped its ability to engage with major contractors on high-profile construction and renovation projects in London.
Director Nick Brewer said major contractors were constantly developing their benchmarks for suppliers, setting the bar even higher.
"London is also the UK’s development capital, for infrastructure and housing, making it even more essential for suppliers to keep their compliance at the highest possible level to remain competitive," said Mr Brewer.
The company recently hosted a visit by members of the UK Contractors Group working on environmental audit systems.
