In Burlington a Serviced Lot Can Carry Three Additional Units, and the First One Needs No Parking Space

Three, on a lot with municipal water and sewer. Section 5.14 of Residential Zoning By-law 09-2026, in force since 2 March 2026, permits up to three additional residential units where a detached, semi-detached, street townhouse or rear lane townhouse is permitted, for four units in total. Up to two may be detached in the backyard, though only one accessory building may contain them. Council first adopted the four-unit rule on 28 January 2025 through Official Plan Amendment 3 and By-law 2020.494.

Not for the first one. Burlington's parking standard is zero spaces for the first additional residential unit and one space for the second or third, on top of the parking required for the main house, two spaces under By-law 2020. Each space must be at least 2.75 metres wide and 16.5 square metres, sit entirely on your property, and be shown as a dashed rectangle on the site plan. Tandem parking is permitted under By-law 2020, and the plan must keep a 3-by-3-metre patch of soft landscaping at the front lot line.

It needs its own way out, and a separate entrance is the cleanest way to get one. Burlington's ARU submission checklist asks you to mark the exterior entrance for each unit as exclusive or shared, and By-law 2020 allows only one exterior entrance on each elevation that faces a street, so the door usually goes on the side or rear. A unit in a rear or interior side yard also needs a 1.2-metre-wide unobstructed path from the street, with no projections into it. HMH builds the separate entrance in three days.

Yes, on a serviced lot, within Table 2 of Section 5.14. A detached additional residential unit is capped at 80 square metres of gross floor area, or 15 per cent of the lot in the LN5 and LN6 zones, and 7 metres tall with a peaked roof or 6 metres flat. It sits 1.2 metres from interior side and rear lot lines, 3 metres for any part above 4.6 metres peaked or 3.5 metres flat, and 4 metres from the house, with no upper-storey decks or balconies. Since 1 January 2025 the building permit can be filed concurrently.

Yes. A basement finish needs a Pre-Building Approval review, priced at $400 in the City's 2026 schedule, followed by a building permit with floor plans showing ceiling heights, wall assemblies, plumbing, alarm locations and any bedroom egress window. The 2025 permit schedule, Schedule A to By-law 18-2025, charged $8.25 per square metre for residential interior alterations against a $377 minimum; Building Permit By-law 30-2026 now governs, so confirm the figure. If the finish is really a future apartment, permit it as an additional unit now.

No separate registration step appears in the City's process. Burlington's published steps run from the ARU look-up tool and zoning clearance through the building permit, staged inspections and the Occupancy Permit, which is what closes the file. Other Halton municipalities register units under their own by-laws; Burlington relies on the permit and occupancy record. Keep the Occupancy Permit and the approved final inspection, because the City also ties any incentive payment to them.

Often yes, but Conservation Halton decides first. Under Ontario Regulation 41/24 it regulates the creek valleys, the Lake Ontario shoreline and a 15-metre allowance beyond the hazard, and any work that increases a building's size or its number of dwelling units is development activity needing permission. On the minor systems, Tuck, Shoreacres and Appleby, all development activities are permitted between 7.5 and 15 metres of the hazard, and a simple permit in that band is $285 in 2026. An interior suite adds no footprint; a walkout or addition is where the review gets serious.

Usually not, for two reasons. Additional residential units are permitted only on a parcel of urban residential land, which means municipal sewer and municipal water; a well, cistern or septic system rules them out. And if your property sits inside the Niagara Escarpment Commission's development control area, the City's zoning by-law does not apply and written NEC approval must accompany any City submission. Interior renovations that do not enlarge the house or change its use are exempt from an NEC permit, and combined additions up to 93 square metres may be too.