To get fire department approval for their six-story London office project made of strong engineered wood known as mass timber, Theo Michell and Richard Walker of Bywater Properties, Maples Teesdale's client, had to build a full-scale section of it in the UK, ship it to Poland and attempt to set it on fire. 

It cost them time and money but Bywater is fully committed to a negative (not just zero or low) carbon footprint for their building, called Paradise.

The test was passed and the building is under construction.