# How to estimate whole roof covering replacement from scope to total in Canada

Plan a whole roof covering replacement estimate in Canada for one accessible pitched roof. Review measured quantities, the Toronto, Ontario CAD calculation, scope exclusions and matching PDF.

Canonical: https://quicklyestimates.com/en-ca/guides/how-to-estimate-roof-replacement/
Author: Estimates editorial team
Published: 2026-09-25
Updated: 2026-09-25

For one accessible pitched roof, start with a defined scope and measurement basis. Measure each roof plane, pitch, edges, penetrations and access; purchasing area differs from projected floor area. Separate covering, underlay, flashings and ventilation allowances. Price the listed tasks separately and state the condition that would require a revision: Unsound decking or hidden water damage requires a revised structural repair line. The Toronto, Ontario worked example checks 7 CAD cost lines against the measured scope, with a C$27,855.00 illustrative subtotal before tax or markup.

THE ESTIMATING ANSWER

For one accessible pitched roof, start with a defined scope and measurement basis. Measure each roof plane, pitch, edges, penetrations and access; purchasing area differs from projected floor area. Separate covering, underlay, flashings and ventilation allowances. Price the listed tasks separately and state the condition that would require a revision: Unsound decking or hidden water damage requires a revised structural repair line.

This guide uses a fictional project in Toronto, Ontario: One accessible pitched roof . Its matching estimate and PDF (https://quicklyestimates.com/en-ca/samples/roof-replacement-estimate/) give each scope decision a visible CAD cost line. Use the document to understand the structure; verify the actual building, product schedule, labour and supplier inputs before preparing a client quote.

1. Define the measured job

Remove and replace the selected pitched roof covering on one defined roof, retaining sound supporting structure after inspection. Measure each roof plane, pitch, edges, penetrations and access; purchasing area differs from projected floor area. Record the measurements and existing condition in the estimate before turning quantities into line items. The scope should make clear why this is a separate project from a broader renovation or maintenance quote.

Measurement basis: Measure each roof plane, pitch, edges, penetrations and access; purchasing area differs from projected floor area.

2. Build a product and labour schedule

Separate covering, underlay, flashings and ventilation allowances. This example has 7 distinct lines, including roof survey and access allowance, old covering removal, underlay allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.

Selections to confirm: Separate covering, underlay, flashings and ventilation allowances.

3. Sequence the work and handoffs

Document safe access, weather protection and a staged tear-off before scheduling. Show which task depends on access, a selected product or another trade. If that dependency is still open, label the price preliminary and identify the information needed before a firm quote.

Work sequence: Document safe access, weather protection and a staged tear-off before scheduling.

4. Set a change boundary

Unsound decking or hidden water damage requires a revised structural repair line. The example excludes roof-framing replacement, solar array removal or concealed rot repair. Record the discovery, agree the revised work and update the estimate before adding it to the job.

If the job changes: Unsound decking or hidden water damage requires a revised structural repair line.

Review the Canadian job address

Review access, grades, drainage and seasonal conditions at the property. Check utility locations, product availability and any local design or municipal requirements that apply to the real scope.

Count the actual units, site visits and selected products separately. A count in this example is a document input, not a substitute for inspecting the real property. The example amounts are fictional CAD document inputs, not current rates for Toronto, Ontario or another community. A site visit and current supplier information are needed to replace them.

Work through the itemized calculation

Check each extension of quantity and rate in the paired PDF. Two lines from this project are:

- Old covering removal: 22 squares × C$215.00 = C$4,730.00.
- Underlay allowance: 22 squares × C$115.00 = C$2,530.00.

Adding all 7 rounded line amounts gives C$27,855.00 . The PDF shows 0% tax and the same total before any markup. The sample shows 0% tax only to make the arithmetic visible. Determine any applicable GST, HST or PST and markup for the actual work before sharing a quote.

Whole roof covering replacement example · CAD Work item | Quantity | Unit rate | Amount |

Roof survey and access allowance | 1 job | C$1,020.00 | C$1,020.00 |

Old covering removal | 22 squares | C$215.00 | C$4,730.00 |

Underlay allowance | 22 squares | C$115.00 | C$2,530.00 |

Selected covering allowance | 24 squares | C$395.00 | C$9,480.00 |

Covering installation | 22 squares | C$310.00 | C$6,820.00 |

Flashings and edges | 1 job | C$2,100.00 | C$2,100.00 |

Waste and final inspection | 1 job | C$1,175.00 | C$1,175.00 |

Illustrative subtotal | C$27,855.00 |

Scope and pricing boundaries

Remove and replace the selected pitched roof covering on one defined roof, retaining sound supporting structure after inspection.

Outside this example: No roof-framing replacement, solar array removal or concealed rot repair.

Keep the product allowance, installation work and any unresolved condition visible as separate decisions. If access or the selected product changes, update the affected quantity or rate and explain the revision before the client relies on the estimate.

Before you send the estimate

- Measure each roof plane, pitch, edges, penetrations and access; purchasing area differs from projected floor area.
- Separate covering, underlay, flashings and ventilation allowances.
- Document safe access, weather protection and a staged tear-off before scheduling.
- Unsound decking or hidden water damage requires a revised structural repair line.

Check the business, client, property, dates, line extensions and notes. The whole roof covering replacement PDF example (https://quicklyestimates.com/en-ca/samples/roof-replacement-estimate/) shows one way to present them. Its short PDF note lists the brief's scope exclusions; the fuller project limits above should guide your own scope.

Questions about this estimate

Which quantity controls this whole roof covering replacement estimate?

Measure each roof plane, pitch, edges, penetrations and access; purchasing area differs from projected floor area.

When should this whole roof covering replacement quote be revised?

Unsound decking or hidden water damage requires a revised structural repair line. No roof-framing replacement, solar array removal or concealed rot repair.

(https://quicklyestimates.com/en-ca/samples/roof-replacement-estimate/) First page of the fictional whole roof covering replacement estimate PDF in CAD · View the matching example (https://quicklyestimates.com/en-ca/samples/roof-replacement-estimate/)

MAKE THE NEXT ESTIMATE YOUR OWN

Build a whole roof covering replacement estimate.

Enter the job scope in Estimates on iPhone or Android or start from an AI-assisted draft. Check every quantity, rate, allowance, client detail and note before exporting the PDF. Some app features may require an in-app purchase.

Create an estimate ↗ (https://quicklyestimates.com/en-ca/download/)Inspect the PDF example → (https://quicklyestimates.com/en-ca/samples/roof-replacement-estimate/)

Continue planning the work

- Whole roof covering replacement estimate example and PDF (https://quicklyestimates.com/en-ca/samples/roof-replacement-estimate/)
- Skylight replacement example (https://quicklyestimates.com/en-ca/samples/skylight-replacement-estimate/)
- Create a contractor estimate for a Canadian client (https://quicklyestimates.com/en-ca/guides/create-a-contractor-estimate/)

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