Permits And Rules
A straight reroof generally does not need a permit. Several things people do at the same time as a reroof do.
Short answer
Replacing roof covering like for like is normally maintenance and does not require a building permit. A permit is generally needed where the structure changes — new framing, a dormer, a skylight opening, a change of roof assembly, or structural repair to the deck or rafters. Heritage property and condominium rules add their own layer.
Generally no permit
Replacing shingles like for like, including tear-off and new underlayment.
Replacing eavestrough, soffit and fascia.
Adding roof vents within the existing assembly.
Flashing repairs and chimney flashing work.
Repairing an existing skylight in the same opening.
And ordinary maintenance generally, which is the bulk of roofing work.
Check rather than assume
Permit requirements are set by the municipality and by the Ontario Building Code, and they change. A ten-minute call to the local building department before the job is cheaper than a stop-work order during it. A reputable roofer will know the local position and will tell you.
Generally a permit
Structural work: replacing rafters or trusses, altering the framing, repairing structural deck damage beyond a minor area.
A new skylight opening, or enlarging an existing one.
A dormer, or any change to the roof shape.
Changing the roof assembly, such as converting a vented attic to an insulated cathedral assembly.
Adding a roof deck or a rooftop structure.
And work on a flat roof that involves new insulation to meet current energy requirements, which depends on the scope.
The other rules
Heritage designation, which in several Toronto neighbourhoods restricts material, colour and profile, and which requires approval before work.
Condominium and co-op rules, where the roof is almost always common element and the corporation rather than the unit owner controls it.
Noise bylaws, which set the hours roofing work may happen.
Waste disposal rules, which matter because a tear-off generates a lot of it and a bin on the street may need a permit.
Parking and street occupancy permits for the bin and the truck, which on a narrow street is a real consideration.
And the neighbour conversation, which is not a bylaw and prevents most of the complaints that become one.
Common questions
Do I need a permit to reroof?
Generally not for like-for-like covering replacement. Structural changes and new openings do.
What about a heritage property?
Several Toronto neighbourhoods restrict material, colour and profile. Get approval first.
Who controls the roof in a condominium?
It is almost always common element, so the corporation rather than the owner.