Assessed value is not market value

This is the single most common misunderstanding about the numbers on this site, so it is worth being precise about it.

Every figure MonRôle shows comes from Quebec's rôle d'évaluation foncière — the municipal assessment roll. That is a tax figure. It is not an estimate of what a property would sell for today, and it is not intended to be.

Why the two differ

It is set every three years, not continuously. Quebec municipalities file a triennial roll. Between filings, a property's assessed value generally does not move, even if the market does.
It is already out of date the day it takes effect. A roll reflects market conditions roughly eighteen months before it comes into force. Montréal's 2026–2028 roll, filed in September 2025, is based on the market as of 1 July 2023.
Municipalities file on staggered schedules. Two neighbouring towns can be working from reference dates years apart, so comparing their assessed values directly compares two different moments in the market.

So if you look up a property you know well and think "that number is too low", the number is probably correct — it is simply measuring something other than the sale price. We have checked the values themselves against the government's own published files for 636,936 properties and they matched exactly, to the dollar, in 100% of cases.

What the assessed value is good for

Judging whether your own assessment is fair. If you are contesting an assessment, the relevant comparison is other properties' assessments — which is exactly what the comparables feature shows.
Seeing direction and magnitude over time. The multi-year trend is meaningful because the same lag sits at both ends of the comparison and largely cancels.
Comparing like with like in one municipality, where every property was assessed on the same basis at the same reference date.

What this site can and can't tell you

Question	Can MonRôle answer it?
What is this property assessed at?	Yes — for all 3.75M properties in Quebec
How has its assessment changed since 2022?	Yes, per individual unit
Is its assessment in line with similar properties?	Yes, where enough comparable data exists
Is the land agriculturally protected?	Yes — province-wide
What zone is it in?	Only in the 12 municipalities that publish zoning
What may I build here?	We link to the official grid; we do not interpret it
What did it sell for?	No — sale prices are not in this data
What is it worth today?	No — see above
Where exactly is the property line?	No — the cadastre is a graphic plan, not a survey

Known limitations, stated plainly

Property lines are indicative. Quebec's cadastre shows the graphic limits of a lot. Only a bornage by an arpenteur-géomètre establishes a legal boundary. Do not rely on these lines for a fence, an encroachment, or a purchase.
Aerial imagery is offset. The imagery's own horizontal accuracy is about 8.5 m at the median. On a narrow urban lot that can exceed a full lot width, so a boundary may appear shifted against the photo even when it is correct.
Some properties show "unavailable". Where a value, trend, category or comparable set cannot be attributed with confidence, we say so rather than showing an approximation. A blank is deliberate.
Zoning covers about 19% of properties. Quebec has 1,101 municipalities and each writes its own bylaw; only a handful publish machine-readable zone maps.

Where zoning data comes from

Municipal zoning is shown for 12 of Quebec's 1,101 municipalities — about 700,700 of 3,747,000 properties. Quebec has no provincial zoning registry; each municipality writes and publishes its own bylaw, and only these twelve publish a machine-readable zone map:

Québec
Gatineau
Longueuil
Saguenay
Lévis
Sherbrooke
Trois-Rivières
Repentigny
Shawinigan
Rouyn-Noranda
Rimouski
Saint-Hyacinthe

Everywhere else, the property panel says zoning is unavailable rather than implying there are no restrictions. The agricultural-zone layer (CPTAQ) is province-wide and independent of this list.

Sources & attribution

MonRôle is built entirely from public and open data. Nothing here is scraped from a competitor, and no owner names or personal information are stored — the assessment roll contains owner details and we deliberately do not ingest them.

Assessment values and history

Rôle d'évaluation foncière du Québec — Ministère des Affaires municipales et de l'Habitation (MAMH), via Données Québec. Rolls 2022 through 2026. Dataset ↗

Taxation rates

Rapport financier des organismes municipaux — MAMH, via Données Québec. The taux global de taxation réel, per organism. Dataset ↗

Agricultural zone

Zone agricole transposée au Cadastre du Québec — Commission de protection du territoire agricole du Québec (CPTAQ). Effective 2026-05-01. Dataset ↗
© Gouvernement du Québec

Property lines (cadastre)

Lots du cadastre rénové du Québec — Ministère des Ressources naturelles et des Forêts (MRNF), served live from the Government of Quebec's mapping service. This is the graphic cadastral plan and has no legal value as a boundary.
© Gouvernement du Québec

Municipal zoning

Published by each municipality as open data, via Données Québec or the city's own portal:

Ville de Québec
Ville de Gatineau
Ville de Longueuil
Ville de Saguenay
Ville de Lévis
Ville de Sherbrooke
Ville de Trois-Rivières
Ville de Repentigny
Ville de Shawinigan
Ville de Rouyn-Noranda
Ville de Rimouski
Ville de Saint-Hyacinthe

Each property's zoning panel links to the specific dataset it came from and, where the city publishes one, to that zone's specification grid.

Imagery and base map

Map rendering — MapLibre GL
Provincial outline — geoBoundaries, derived from Statistics Canada boundary files
Street View links — open Google Maps; no imagery is reproduced here

Terms of use

MonRôle is an information tool, not an authority. The municipality, the assessment roll, the zoning bylaw and a licensed surveyor are authoritative; this site is not.

Nothing here is an appraisal, a legal opinion, or advice on a purchase, sale or financing decision.
Zoning information is a convenience copy. Confirm the applicable zone and its rules with the municipality before relying on them.
Property lines are graphic and must not be used to determine a legal boundary.
Data is provided as published by its sources and may contain errors, omissions or out-of-date records.

Questions, corrections, or a source we've credited incorrectly — we want to know. Accuracy complaints are treated as bug reports.