Waterloo: questions buyers ask
What records explain additional units and fourplexes at a Waterloo home?
Zoning By-law 2018-050, section 3.A.1B (Additional Residential Units), as explained on the City's additional residential units page.
Sources checked October 28, 2026
The rule in Waterloo
Up to 4 homes on a lot
Waterloo zoning by-law 2018-050: permits up to four units on a low-rise residential property, in buildings up to four storeys, inside the house or in a backyard coach house or other detached building (section 3.A.1B).
From Waterloo by-law 2018-050, checked 28 Oct 2026
- The recordUp to four units on a lot
- Where to read itLearn about Additional Residential Units (ARUs)
- The free check reads itPick “Extra units allowed”
What the record shows
The City's page says its updated zoning by-law allows up to four units on a low-rise residential property, and buildings up to four storeys in all low-rise residential areas. An additional unit may be inside a single-detached, semi-detached or townhouse building, or in a backyard coach house or other detached structure. The details are in Zoning By-law 2018-050, especially section 3.A.1B; the City's interactive zoning map shows a lot's zone, with the note that its data is from May 30, 2025 and can't be relied on for real estate or permitting purposes.
Before construction a unit needs a building permit, and a unit that will be rented needs a City rental licence. A permitted use in the zone does not make an existing unit lawful or licensed; the zoning by-law and the City's zoning staff are the record for a particular lot.
Where to read it yourself
- Learn about Additional Residential Units (ARUs): the City's page: four units, four storeys, the by-law sections, permits and rental licences
What OfferDue covers in Waterloo
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 reads the lot's zone where the City's zoning map is open data we can use; where it isn't, the report's line says where the City publishes it. 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.