Roofing in Ottawa: Replacement, Permits & Materials

A roof protects far more than the shingles you see from the street. Underlayment, flashing, ventilation, attic moisture control, drainage and workmanship all affect how a roof performs through Ottawa's snow, freeze-thaw cycles, wind and summer storms.

Use this page to plan the job and compare roofing proposals. It is not a list of endorsed roofers and does not provide structural or safety approval.

Repair, re-cover or replace?

A quote limited to new shingles may not resolve a chronic leak caused by a chimney-flashing detail or warm indoor air escaping into the attic. The best proposal addresses the underlying cause, not simply the visible symptom.

Does Ottawa require a roof replacement permit?

The City of Ottawa lists installing asphalt shingles on a roof among projects that normally do not require a building permit. This is a specific exemption, not a blanket statement that all roof work is permit-free. Structural changes, certain other scopes and heritage-designated properties may require further review. See the City's official exemption list and confirm details before authorizing work.

Changing roof structure or converting materials can also raise questions about loads, assembly design and the exact permit scope. If the property lies in another municipality, Ottawa's exemption list does not govern that municipality's requirements.

Asphalt versus metal roofing

Both can be suitable for Ottawa homes. The decision should reflect the full installed system and the home's particular roof shape rather than a universal claim that one material is always superior.

• Asphalt shingles: many profiles and price points, familiar installation methods and a wide contractor market. Product grade, ventilation and installation quality matter.
• Metal roofing: different standing-seam or exposed-fastener designs and potentially different long-term maintenance and snow-shedding behaviour. Details such as penetrations, fasteners, coatings and snow retention matter.
• Both: compare underlayments, flashings, decking repairs, ventilation, gutters, workmanship warranties and how changes will be documented.

Ask whether the quoted amount includes removal and disposal of existing materials, hidden-decking allowances and restoration around roof penetrations. A low materials-only number is not a comparable installed price.

Winter conditions and ice dams

Natural Resources Canada's roof and attic guidance explains that warm air escaping into a roof assembly can contribute to ice-dam formation. Attention to air sealing and insulation, and ventilation appropriate to the roof design, is usually more important than assuming a different shingle brand will solve the problem. Self-sealing membranes can limit leakage but do not eliminate the underlying causes of ice dams.

Do not climb onto a snow-covered or icy roof to investigate a problem. Ask a qualified professional about safe inspection and any needed structural or attic assessment.

Roofing quote checklist

Before comparing bids, ask contractors to specify:

1. The exact roof areas, slopes and existing layers included.
2. Removal versus overlay, decking inspection and how concealed damage is priced.
3. The manufacturer, product line, underlayment, flashing and ventilation details.
4. How ice-and-water protection, eaves, valleys, skylights and chimneys are handled.
5. Site protection, debris removal and landscaping protection.
6. Permit or heritage questions, if the proposed work extends beyond ordinary re-shingling.
7. Installation schedule, weather delays, workmanship warranty and product warranty limitations.

A written contract should state how additional work is approved. For a rural property or a complicated multi-level roof, safe equipment access and staging may affect the scope significantly.

Related Ottawa roofing guides

• Do you need a permit to replace a roof in Ottawa? — ordinary re-shingling versus structural or heritage work.
• Asphalt versus metal roofing in Ottawa — cost factors, snow, durability and long-term comparisons.

Editorial scope: Permit exemptions, product requirements and warranty conditions can change. Verify the specific work and location with the responsible municipality and suitably qualified contractors.