Do You Need a Permit to Replace Your Roof in Ottawa?

Replacing worn asphalt shingles on an ordinary Ottawa house is generally not a project that requires a City of Ottawa building permit. The City's official exempt-project list expressly includes installing asphalt shingles on a roof. That simple answer changes if the job also involves structural repairs or alterations, a designated heritage property, a different roofing system or another regulated scope of work.

The short version: For straightforward asphalt reshingle work, see the City's projects-not-requiring-permits list. Before signing for truss, rafter or other structural changes—or changing materials at a heritage property—ask the City's Building Code Services and Heritage staff which separate approvals apply.

Scope and date: Reviewed October 16, 2026. This article addresses City of Ottawa building-permit guidance. Properties in Carleton Place, Mississippi Mills, Arnprior, Clarence-Rockland or other municipalities are governed by their own local permit administration. A no-permit answer does not excuse unsafe work or noncompliance with applicable building codes.

1. When is replacing asphalt shingles exempt?

The City of Ottawa's list of projects exempt from building permits explicitly identifies installing asphalt shingles on a roof. Its building-repair FAQ likewise lists replacement shingles and certain repairs to sheathing among repairs that do not require a building permit.

That is a useful answer for a homeowner replacing a weathered shingle covering while the existing roof structure remains sound and the scope stays within the City's stated exemption. But the word 'roof replacement' is imprecise: some contractors mean installing new covering, while others mean rebuilding roof components.

The City's own weather-damage guidance says a building permit is required when weather-related repairs include replacement or alteration of structural framing, including trusses and rafters. An inspection that finds rot can change the permit answer even after the roofer has opened the roof.

2. Building permits and heritage approvals are different

A property can be exempt from an ordinary building permit yet still have heritage-specific obligations. Ottawa's exempt-project webpage instructs owners of designated heritage buildings or properties within heritage district overlays to contact Building Client Service Centre for their specific situation.

Ontario's heritage-property guidance explains that normal maintenance, such as repairing or replacing an asphalt roof on an individually designated property, does not usually require heritage consent if it does not affect protected heritage attributes. That is not a blanket approval for every roof or every district. The property's designation and conservation district plan matter; changing roof profile or historic materials may be more consequential than replacing like-for-like asphalt.

Do not assume a contractor's 'no permit needed' statement answers heritage questions. Ontario Heritage Act guidance describes approvals for alterations affecting protected attributes. Contact Ottawa Heritage Planning with the property address, existing material, proposed material, photographs and any planned structural change.

3. What if the roofer finds rotten roof sheathing or rafters?

Roof covering and roof structure serve different purposes. A roofer may remove shingles and discover wet sheathing, ventilation problems, deteriorated fascia or rot near a valley or chimney. Some non-structural repairs can fall within the City's exemptions; removing or replacing structural framing can trigger permits.

Ask the contractor before work starts how unexpected problems will be documented and authorized. A written change order should identify the damaged component, proposed repair, whether it is structural, additional cost and whether municipal review is required.

Important questions:

1. Is the defect in decking/sheathing, or in rafters/trusses or another structural component?
2. Does the proposed repair change loads, roof geometry or structural connections?
3. If a permit is required, who prepares any design and coordinates the City's inspection?
4. How will the site be made weather-tight while approvals or materials are pending?
5. Will photographs and repair details be included in the closeout paperwork?

Don't ask workers to conceal damaged framing or complete structural changes without needed approvals because the roof is already open.

4. Does switching from shingles to a metal roof require a permit?

It is not safe to extrapolate the City's express asphalt-shingle exemption to every possible roof-material substitution. A metal roof may be installed using many different profiles, attachment methods and underlayment systems. Structural condition, existing roof layers, possible weight differences, fastening and fire classification need professional review; a heritage building adds another layer of scrutiny.

The City asks homeowners unsure of a project's permit status to contact Building Code Services or call 3-1-1. Provide the actual proposed scope, not just the phrase 'new roof.' The City's answer may depend on whether framing or heritage attributes are affected.

If comparing materials, see BestOttawa's separate guide Asphalt vs. Metal Roofing in Ottawa: Costs, Winter Performance and Lifespan when published.

5. No building permit doesn't mean there are no rules

Even an exempt reroof must be installed safely and meet applicable laws and product requirements. The City specifically says exempt projects must still comply with the Ontario Building Code and other applicable law.

Ask about roofing practices that materially affect winter performance:

• Roof slope and compatibility with the selected covering.
• Eave protection and ice/water membranes where required.
• Ventilation, attic air leakage and insulation problems.
• Flashing around chimneys, walls, skylights, vents and valleys.
• Underlayment, fastening patterns and manufacturer installation requirements.
• Safe roof access, debris containment and protection of neighbouring property.

NRCan's roofs-and-attics guidance explains why attic heat leakage contributes to ice dams. An expensive new shingle or metal covering does not automatically fix the underlying attic problem.

6. What about a roof damaged by wind, fallen trees or snow?

Treat storm damage as a safety and assessment matter first. Missing shingles may be a relatively straightforward covering repair. Visible sagging, failed trusses, displaced roof structure or serious framing damage is different and may require municipal approvals and professional design.

Ottawa's building-repair FAQ identifies deformation or deflection of structure and structural framing work as requiring a building permit. Do not climb a damaged roof to decide for yourself; arrange qualified assessment.

If insured, photograph visible damage from a safe location, contact your insurer promptly and follow its documentation requirements. An insurance adjuster's permission to repair is not a replacement for City permitting decisions.

7. What should an Ottawa roofing quote actually include?

Some homeowners receive a one-line price for 'roof replacement' without enough scope to compare contractors. Request written, itemized proposals on the same roof area, materials and assumptions.

No particular roofer is endorsed here. Before hiring, check business identity, insurance, references and what the contractor's written warranty actually covers.

8. How much does roof replacement cost in Ottawa in 2026?

There is no authoritative City of Ottawa installed-roofing price schedule. A simple asphalt reshingle of a straightforward roof can differ dramatically from a steep, multi-level roof with many valleys, complex flashing or damaged framing. Metal roofing introduces further differences between exposed-fastener systems and standing-seam profiles.

Avoid comparing a nominal 'price per square foot' without confirming whether the quoted area is roof surface area, how tear-off and disposal are handled, and what is included. Ask for two or three site-specific written quotes. Commercial pricing webpages can be useful for orientation, but should not be presented as independent Ottawa market averages.

Important: A permit exemption does not mean the City has inspected the roof or certified the roofer's work. Homeowners still need to review product, workmanship and warranty terms.

9. A practical decision guide before signing

If roofers disagree on whether structural work is needed, ask for clear photos and a written explanation of what each proposes. Independent assessment can be valuable before authorizing a large change order.

10. Save this roof replacement approval checklist

Before requesting estimates:

• Check whether your property has heritage status or lies in a conservation district.
• Describe whether you're replacing asphalt shingles like-for-like or changing materials.
• Ask for photos of known leaks, sagging, flashing issues or attic concerns.

Before signing:

• Confirm with City Building Code Services when the proposal involves structural work or unclear materials.
• If heritage requirements may apply, obtain written guidance from the proper office.
• Compare roof assembly, flashing, underlayment, warranties and change-order policies.
• Clarify who manages any permit and inspection and protects the roof during delays.

At completion:

• Keep the contract, final invoice, products, warranty and photos of concealed repairs.
• Receive copies of any permits, inspection documents or heritage approvals that were needed.
• Confirm ventilation and water-drainage concerns were addressed as specified.

Editorial note (reviewed October 16, 2026): This article summarizes the City of Ottawa's publicly posted permit exemptions and provincial heritage principles. It is not a permit determination for a particular address or roofing design. Requirements may change; confirm uncertain or structural scopes with the City before work begins.