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Legal basement conversions

Legal basement units, planned around the rules from day one

A second unit can bring in rental income or house family. It also comes with real requirements — and the time to plan for them is before the first stud goes up.

Finished basement walk-out with board-formed concrete walls, a sloped concrete landing with a round drain, a black full-lite exterior door, glass railing and a deck overhead

"Legal" means permitted and inspected

A legal basement apartment is a self-contained unit built with a building permit and passed by the required inspections. It typically has its own entrance, kitchen, bathroom and sleeping area, and meets requirements covering things like ceiling height, exits and egress windows, fire separation between units, smoke and carbon-monoxide alarms, and heating and ventilation.

Requirements differ by municipality and change over time, so every project starts with a review of your house and the current rules where you live. We then plan the layout, coordinate drawings and permit applications, and build to pass inspection.

What a conversion usually involves

The specifics depend on your home and the current code — this is the general shape of it.

A separate entrance
Often a side door or a new walk-out entrance built below grade.
Exits and windows
Bedrooms need egress windows of a minimum size; the unit needs a safe way out.
Fire and sound separation
Ceilings and walls between units are built with rated assemblies, with alarms interconnected where required.
Ceiling height
Minimum heights apply in living areas and along exit routes. Bulkheads and beams are measured carefully.
Kitchen and bathroom
New plumbing and venting, sized and inspected.
Heating and ventilation
How the unit is heated and ventilated is part of the design and the permit drawings.

A recent walk-out entrance, start to finish

Real photos from a single Shabo walk-out entrance built under an existing deck.

  1. Excavated pit beside the foundation under a temporarily shored deck, before the walk-out stairwell was formed

    Excavation

    The deck is temporarily shored and the area beside the foundation dug out to depth, with water managed as we go.

  2. Timber formwork for the walk-out stairwell walls with freshly poured concrete on top, the new door opening boarded over

    Forming and pouring

    Timber forms set for the stairwell walls and stairs; concrete poured and the new door opening framed.

  3. View up the new concrete walk-out stairs from the landing, with board-formed concrete walls and glass guards on both sides

    Stairs and landing

    Board-formed walls, broom-finished steps and a landing sloped to a drain.

  4. Finished basement walk-out with board-formed concrete walls, a sloped concrete landing with a round drain, a black full-lite exterior door, glass railing and a deck overhead

    Door, guard and pad

    Exterior door installed, glass guards on the walls, and a new concrete pad tied into the yard.

How we help

How it works

How the work unfolds

  1. Assess the space

    Ceiling heights, moisture, mechanicals, windows and where a bathroom or entrance could go.

  2. Plan and permits

    A layout that suits your goals, with drawings and permits arranged where they are needed.

  3. Framing and rough-ins

    Walls, insulation, plumbing, electrical and ductwork, inspected before they are closed in.

  4. Drywall and finishes

    Drywall, flooring, doors, trim, bathroom and bar finishes.

  5. Final walkthrough

    Final inspection where required, then a walkthrough with you.

Start with a free estimate

Questions

Legal Basement Conversions: common questions

Still have a question? Ask us directly

Is my basement suitable for a legal unit?

Many are, some are not without major work. Ceiling height and the ability to add a safe entrance and egress windows are usually the deciding factors. A walk-through answers it quickly.

Do you guarantee the permit will be approved?

No one can guarantee an approval — that is the municipality’s decision. What we do is plan to the current requirements, prepare a complete application with the right professionals, and build to pass inspection.

How long does a legal conversion take?

Longer than a standard basement finish, because permits and inspections are part of the schedule. We map out the stages with you before starting.

Where we work

Based in Hamilton. Working across the city.

Most of our work is in Hamilton and the communities around it. Not sure if we cover your street? Ask — it takes ten seconds.

Service areas

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