ADU Floor Plans That Fit a Winnipeg Lot

Updated October 2026, from the City of Winnipeg's secondary suite requirements.

With 600 sq ft to work with, every foot matters. A plan that looks fine on paper can end up with a bedroom that only fits a double bed, or a front door that opens into the kitchen. The City's rules also decide a lot of the layout before you've picked a single finish, so it's worth knowing them going in.

The Rules That Shape Every Plan

These come from the City's requirements for a detached secondary suite. The full list is in our Winnipeg ADU rules guide.

• 350 to 600 sq ft of floor area. That's the whole budget, bathroom, closets and all.
• 15 ft tall on grade, or 25 ft over a detached garage. A single-storey suite has room for a vaulted ceiling or a small loft, but not a full second floor.
• Every habitable room above grade. No basement bedroom in a detached suite.
• No windows or doors facing the lane at a 5 ft setback. On a lot with a back lane the suite can sit 5 ft from the rear line, but then the wall facing it stays blank. Light comes from the yard side, the sides and skylights.
• No side windows where the side yard is 8 ft or less, apart from clerestory windows up high. On a narrow lot that leaves the yard-facing wall doing most of the work.
• At least 10 ft from the house, which is also the outdoor space both households will share.

Put those together and most Winnipeg backyard suites end up with the same basic shape: the front door and the big windows face the house across the yard, and the back wall holds the kitchen, the bathroom and storage, the rooms that need the fewest windows.

Room Sizes That Actually Fit

These are working sizes designers use for small homes. Go much below them and rooms start to feel like corridors and furniture stops fitting.

The one people forget is mechanical space. A small home still needs a furnace or heat pump, a water heater and a panel, and in a Winnipeg winter they need to live inside the heated envelope. Plan a closet for them from the start.

Plans Over a Garage

A suite over a garage can go up to 25 ft tall, and the garage underneath doesn't use any of the suite's 600 sq ft. The trade-off is the stair.

• An inside stair is warm and dry in January, but it takes a strip out of the garage below and part of the suite above.
• An outside stair saves the floor space but needs shovelling, and it's a hard climb for anyone with bad knees.
• A 24' x 24' double garage gives a 576 sq ft footprint upstairs, the one-bedroom plan above, almost exactly.

Plans for a Parent

A granny suite is worth planning for the person someone will be in ten years. Most of this costs little when it's drawn in from the start and a lot to add later.

• One level, with a step-free entry and a short, level path to the house.
• Wider doors, around 36 in, and a hall wide enough for a walker.
• A bathroom with a 5 ft turning circle, a curbless shower and blocking in the walls for grab bars.
• Laundry on the main floor, not in a shed or the main house.
• A bedroom big enough to get round a bed with a walker on both sides.

That usually pushes a one bedroom toward the full 600 sq ft, which is a good use of it.

Basement and Attached Suites

An attached or basement suite has different limits: up to 800 sq ft, or a third of the combined floor area of the house and suite, whichever is less. Its layout is set by the house you already have: where the stairs land, the ceiling height, the beam and the ductwork, and where an egress window can go in each bedroom. There's no sample plan for that, which is why we start a basement suite with a walk-through.