Hamilton: questions buyers ask
What records explain duplexes, triplexes and fourplexes at a Hamilton home?
Zoning By-law 05-200 as amended by By-law 24-051, which rewrote the R1 and R1a zones and created the R2 zone, and the City's interactive zoning mapping.
Sources checked October 16, 2026
The rule in Hamilton
Up to 4 homes on a lot
Hamilton zoning by-law 05-200: permits up to four units (a fourplex) in the R1, R1a and R2 zones since February 2024; areas still under a former municipality's by-law follow that by-law's rules.
From Hamilton by-law 05-200, checked 5 Oct 2026
- The recordDuplexes, triplexes and fourplexes
- Where to read itBy-law 24-051; Zoning By-law 05-200, Section 15.1: R1 zone and 1 more
- The free check reads itPick “Extra units allowed”
What the record shows
By-law 24-051, passed on 10 April 2024, updated the Low Density Residential (R1) and Small Lot (R1a) zones and created the Large Lot (R2) zone across the urban area. Each of the three lists single detached, semi-detached, street townhouse, duplex, triplex and fourplex dwellings among its permitted uses, with the fourplex under its own regulations, including a minimum lot size and width. The City's zoning page says the residential zones of the former communities are still regulated by each former municipality's by-law, so a lot's zone decides which rules apply.
The City's interactive zoning mapping shows the zone for any lot and which by-law governs it. A permitted use in the zone does not make an existing basement apartment lawful, and every new unit still needs a building permit; the City's additional dwelling unit team handles those questions.
Where to read it yourself
- By-law 24-051: the amending by-law for the R1, R1a and R2 zones (PDF)
- Zoning By-law 05-200, Section 15.1: R1 zone: the permitted uses and regulations, as consolidated (PDF)
- Interactive zoning mapping: the zone and by-law for any lot
What OfferDue covers in Hamilton
Extra units allowed is in the free check as a summary of the City's rule, from our hand-kept table of city rules, and the full report adds the zoning line for the lot. Neither is confirmation that a particular unit holds a permit or may be occupied.
Free check: pick “Extra units allowed” See the sample report
Public-record information, not legal, financial, insurance or inspection advice. Records change and can be incomplete, and this page describes the records, not any particular home. What we cover, city by city.