In short · September 28, 2026
Before challenging the value, check the facts entered on the roll for your property: lot area, floor area, number of dwellings, year built, number of storeys, type of construction. Quebec.ca invites owners to report "errors, omissions or other elements the evaluator may have missed" (our translation).
Where to find your property’s data
For each property, the roll shows the land value, the building value and the total value, along with the features the evaluator used. Many municipalities let you look up their roll online, address by address. The roll published by the MAMH on Données Québec carries the same fields for every municipality, without owners’ names: the list below covers the main ones.
The checklist
Compare each item on the roll with your documents (certificate of location, plans, deed of sale, permits):
- Lot area (in m²): compare with the certificate of location.
- Lot frontage (in metres).
- Floor area (in m²): an inflated area pushes up the building value.
- Number of storeys and type of construction (bungalow, split-level…).
- Year built, and whether it is actual or estimated.
- Physical link: detached, semi-detached, row or condominium.
- Number of dwellings and non-residential units: one dwelling too many changes the property’s category.
- Use entered (use code): residential, commercial, mixed.
- Agricultural zoning, if applicable.
What you will not see on the roll
The roll does not describe the condition of the property: a roof to redo, a cracked foundation or a latent defect do not appear on it. If they existed on the reference date, they are defects to document in your request.
On the other hand, work done without a permit can be discovered during a visit, and the value can then go up. Make sure everything that exists is properly authorized before reopening the file.
You found an error: next steps
Note the discrepancy, gather the proof (certificate of location, plan, photo) and file a review request within the deadline: as a general rule before May 1 of the first year of the roll, or within 60 days of an amendment notice. The complete guide gives the steps and fees.
Official sources
- Québec.ca: requesting a review of the property assessment (in French)
- Données Québec: Quebec property assessment rolls (MAMH, CC BY 4.0, in French)
- City of Montréal: requesting a review of the property assessment roll (in French)
- City of Terrebonne: property assessment roll (in French)
- MRC Brome-Missisquoi: review request (in French)
Talk to a chartered appraiser in your area
For a plex, an income property, a file headed to the TAQ or any value you are seriously challenging, a chartered appraiser is the right person. Payotte has verified 30 in Quebec, one per sector, selected on public data, never on their budget.
Find the verified appraiser in my areaGeneral information based on public sources. This is neither legal advice nor a certified appraisal. A review request can also lead to a higher value.
Frequently asked questions
What errors should I look for on my assessment notice?
The facts entered on the roll: lot area, floor area, number of storeys, year built, number of dwellings, use. Compare them with your certificate of location, your plans and your permits.
Is an inventory error enough to challenge?
It is a recognized ground: quebec.ca invites owners to report errors and omissions. The error must, however, have an effect on the value, and the request must be filed within the deadline.
Where can I look up my property’s data?
On your municipality’s website, if it publishes its roll online by address, or with the body responsible for assessment (MRC or city).