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Structural Renovations

Attic Conversion in Ontario

Not every attic can become a bedroom, so an honest conversion starts with feasibility, not finishes. The Ontario Building Code sets the tests: enough ceiling height over a usable portion of the floor, a stair that meets current geometry, a window sized for egress, and a floor structure designed for living loads rather than the ceiling loads most attics were framed for. We measure your attic against each requirement first, and tell you plainly whether the space qualifies and what it will take.

When the numbers work, the build is a structural project wearing a comfortable finish. An engineer designs the floor reinforcement — typically sistered or new joists, sometimes a beam picking up loads mid-span and carrying them down to the foundation. The stair location gets settled early because it costs space on the storey below. Then insulation, air sealing and ventilation turn a formerly unconditioned zone into a warm, quiet room, with permits and staged inspections running through the whole sequence.

What this covers

  • Feasibility review measuring height, stairs, egress and structure against the Building Code
  • Engineered floor reinforcement design and stamped drawings
  • Permit drawings, application and staged inspection coordination
  • Floor structure upgrades built exactly to the engineer's specification
  • New or rebuilt stairs meeting current Code geometry
  • Egress window supply and installation
  • Insulation, air sealing and ventilation for a fully conditioned space
  • Electrical, heating extension and complete interior finishing by licensed trades

What affects the price

  • How much usable floor area clears the Code's height requirements
  • The extent of floor reinforcement the engineer specifies
  • Where the new stair lands and what it displaces on the storey below
  • Egress window placement and any structural framing it requires
  • Extending heating, cooling and electrical service up an extra storey
  • Adding a bathroom, which brings plumbing runs and ventilation into scope

Every home is different, so we don’t publish flat prices — the quote is free and based on your actual job.

Attic Conversion near you

We take quote requests across Ontario. Local pages:

TorontoOttawaMississaugaBramptonCaledonHamiltonVaughanMarkhamRichmond HillAuroraNewmarketGeorginaWhitchurch-StouffvilleKingOakvilleBurlingtonMiltonHalton HillsOshawaWhitbyAjaxPickeringClaringtonKitchenerWaterlooCambridgeLondonBarrieInnisfilBradford West GwillimburyCollingwoodSt. CatharinesNiagara FallsWellandGrimsbyFort ErieGuelphWindsorKingstonGreater SudburyPeterboroughThunder BayBrantfordBellevilleSarniaWoodstockStratfordOrangevilleCornwallNorth BaySault Ste. MarieChatham-KentOrilliaWasaga BeachMidlandNew TecumsethSt. ThomasKawartha LakesCobourgPort HopePrince Edward CountyQuinte WestLeamingtonOwen SoundBracebridgeHuntsvilleNiagara-on-the-LakeTimminsBrockville

Common questions

How much ceiling height does an attic conversion need?
The Building Code requires a minimum ceiling height over a defined share of the room's floor area, with sloped ceilings allowed to dip lower toward the sides. Rather than quote figures that shift with room type, we measure your attic during the feasibility visit and map exactly how much compliant floor area exists — that map decides the design.
Can my existing attic floor support a living space?
Usually not as built. Most attic floors are ceiling joists sized to hold up the drywall below, not people, furniture and partitions above. That is a solvable design problem, not a dead end: an engineer specifies reinforcement — sistered joists, new members or a beam — and the strengthened floor is inspected before it is closed in.
Does an attic bedroom need a special window?
It needs an egress-compliant opening: a window large enough to escape through in an emergency, meeting the Code's minimum openable dimensions, unless the home has other qualifying provisions such as sprinklers. Egress placement is settled during design because the window's size and position affect framing, appearance and furniture layout all at once.
Is a permit required to convert an attic?
Yes. Turning unconditioned attic space into living area is a change the Building Code regulates directly — structure, stairs, height, egress, insulation and smoke alarm coverage all get reviewed. Your municipality issues the permit against professional drawings and inspects at stages. An unpermitted conversion is a liability at resale and an insurance risk today.

Ready to sort out your attic conversion?

Tell us what you're planning — one room or the whole home — and get a free quote.

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