The claim
A downtown St. Catharines landmark built in the early 1800s by William Hamilton Merritt, promoter of the Welland Canal, as a home and store, then turned into a hotel in the 1820s. It claims to be Canada's longest continually licensed bar. A pandemic-era refit made it a more upscale bar and kitchen, open late from Wednesday to Saturday.
What the records show
The bar brands itself since 1806 and calls itself the oldest continually licensed bar in Canada; its own account says William Hamilton Merritt, promoter of the Welland Canal, built the place in the early 1800s as a home and store and that it became a hotel in 1826, where other accounts give 1828. Neither date has been traced to a record. The city's own heritage layer, published through the Niagara open data portal and searched on 17 September 2026, does carry the property: 5 William Street is on the St. Catharines heritage register. It is a listing and not a designation — neighbouring properties in the same search come back marked as designated under the Ontario Heritage Act or as part of the Yates Street and Port Dalhousie districts, and this one does not — and the register entry carries no construction date, no builder and no description. So the earliest fabric date for this building still rests on the bar's own telling of its history and on a pub magazine repeating it, which is not enough for a B: the grade is now C. The 1826 is the earliest year anybody offers for drink sold here, so the 1806 belongs to the building rather than the trade. A refit during the pandemic turned it into a cocktail-and-kitchen house, and that is what a visitor meets now.
| Year | What | Source |
|---|---|---|
| 1806 | Claimed founding | The pub |
| 1826 | First record of a drinking house here | themansionhouse.ca |
What to look for inside
- Claims Canada's oldest continually licensed bar
- Built by Welland Canal promoter William Hamilton Merritt
Visiting
The Mansion House is in St. Catharines, Canada, at 5 William Street, St. Catharines, ON L2R 5H8. We do not list opening times, because they change; the pub’s own site is the place to check before you set out.
Sources
- themansionhouse.ca/
- www.ontariopubs.ca/PDF/pubMagazine/pubmagazine_2014_13_web.pdf
- niagaraopendata.ca/dataset/heritage-properties-public
- services6.arcgis.com/Yx1h0qHJ9wIpQWuU/arcgis/rest/services/Heritage_Properties_Public/FeatureServer/0/query?where=UPPER(PROPERTYNAME)+LIKE+%27%25WILLIAM%25%27&outFields=PROPERTYNAME%2CPROPHVALUE&returnGeometry=false&f=html
Know something we don’t?Suggest a correctionLast checked Sept 2026
Run this pub? There is a badge for it
Free to put on your own site, no permission needed. It shows what the pub claims and what the records support, and it changes when the data does.
How to use it, and how to change what it says — if you have a document we have not seen, we would like to read it.
