Can I build on rural land in Ontario without a building permit?
Usually you cannot, with a few exceptions. A municipal building permit is needed before you build a new structure over 10 square metres, add to or renovate a building, change its use, excavate or lay a foundation, or install, alter or repair a septic system. Building without a required permit is an offence under the Building Code Act, 1992, with fines up to $50,000 for an individual's first offence and up to $100,000 for later ones.
A small shed is an exception: it needs no permit under the 2024 Building Code if it is no more than 15 m² in gross area, one storey or less, not attached to any structure, used only for storage accessory to a principal building, and has no plumbing, and a cabin does not qualify. Zoning still matters, because no permit is issued until any needed zoning change or minor variance is approved.
A conservation authority permit is also needed for development in regulated areas such as floodplains, shorelines, wetlands and watercourses. In unorganized territory, permits are not available, but buildings must still comply with the Ontario Building Code. Local by-laws vary, so check with your municipality before you start.
Key takeaways
- A municipal building permit is needed for new structures over 10 square metres, additions, renovations, foundations and septic work.
- Building without a required permit is an offence under the Building Code Act, 1992, with fines up to $50,000 for an individual's first offence.
- A small shed of no more than 15 m² that is detached, accessory to a principal building and has no plumbing needs no permit, but a cabin does not qualify.
- A conservation authority permit is needed for development in regulated areas such as floodplains, shorelines, wetlands and watercourses.