On September 23, 2014, after many years of research, development, stakeholder feedback and discussion, the Ontario Ministry of Municipal Affairs and Housing announced amendments to the 2012 Ontario Building Code (OBC) that permit 5- and 6-storey combustible construction for Group C and D occupancies. e amendments to the OBC increase opportunities for designers and builders to create versatile and affordable new buildings. The changes recognize the advancements in wood products and systems as well as in fire detection, suppression, and containment systems.

Densification is mandated in almost all municipal growth plans in the province. Mixed-use mid-rise buildings are seen as an important solution that will help create higher density and attract businesses and families to urban centres. Previous code restrictions on combustible construction made non-combustible solutions the only option for mid-rise development and many potential developments were stalled because they were deemed cost-prohibitive. Developers now have a new, cost effective option to provide mid-rise solutions.

Decisions about how and where we build our communities have significant impacts on the natural environment and on human health. Wood is a natural, sustainable material and the processing of raw material into building materials has a lower environmental impact when compared to other major building components. e use of sustainable materials and components reduces the negative impact our buildings have on the environment and assists in mitigating climate change. The amendments to the OBC have created exciting new opportunities but there are also new design and construction challenges to consider. Ontario Wood WORKS! developed this guide to explain the new provisions in the OBC and to discuss the opportunities as well as the challenges.