What is applicable law?
Other approvals that must be in hand before the City accepts or issues a building permit. The City's checklist: Applicable law is other regulations for which approval must be obtained before a building permit can be accepted or issued.
Its list includes site plan, heritage, source water protection, the Niagara Escarpment Commission, conservation authorities, the Ministry of Transportation near highways and Metrolinx near the LRT corridor (City of Hamilton, Applicable Law Checklist, read November 5, 2026).
When does a conservation authority have to approve it?
When the property is in a regulated area, usually near a creek, valley, wetland or shoreline. The City: any development and/or site alteration is subject to Ontario Regulation 166/06 and requires approval from the applicable conservation authority before a building permit can be issued
(City of Hamilton, Residential Infill, read November 5, 2026). The four that cover Hamilton:
| Authority | Phone |
|---|---|
| Hamilton Region (Hamilton Conservation Authority) | 905-525-2181 |
| Halton Region (Conservation Halton) | 905-336-1158 |
| Grand River Conservation Authority | 519-621-2761 |
| Niagara Peninsula Conservation Authority | 905-788-3135 |
The City adds that natural features are protected by the City of Hamilton, Conservation Authorities, and the Province of Ontario
, and a City natural heritage planner answers at 905-546-2424 extension 1355 (City of Hamilton, Building Permit Application Requirements, read November 5, 2026).
When does the Niagara Escarpment Commission come in?
When the property is in the Commission's Area of Development Control. The Commission: Landowners in the Niagara Escarpment area are required to obtain a development permit for certain types of development.
Its permit is similar to a municipal building permit
but also weighs the effect on the escarpment's landscape and natural environment (Niagara Escarpment Commission, read November 5, 2026). The Commission has an interactive map to check a property, and the City lists its number as 905-877-5191.
What does that mean for an addition, an ADU or a new home?
Time, mostly. These approvals come before the building permit, so they go at the front of the schedule. A rear addition or a detached ADU on a ravine lot is the common case. The areas page lists the other location rules, including the former towns' zoning by-laws.