Ontario�s building code ontario only proposed change to the 2006 building code change number e-b-12-01-01 code reference div. b 12.1. & 12.2. description of proposed amendment add new requirements that reflect new sub-objectives and functional statements related to protection of the environment and limitations on greenhouse gas emissions.. Ontario building code act and the ontario building code ontario's building code (the code) is a regulation made under the building code act (the act). the code sets out province-wide technical and administrative requirements for the construction, renovation, change of use and demolition of buildings in ontario.. Attaining a building permit for your diy greenhouse does not have to be a difficult process. just have patience, be willing to listen and you can avoid incurring the wrath of your local code enforcer..