Egress Window During Basement Apartment Conversion Toronto

# Egress Window During Basement Apartment Conversion Toronto

The egress window install on a Toronto basement apartment conversion is one of seven or eight major scope items competing for sequencing priority. Fire separation, second exit, kitchen install, bathroom install, electrical separation, HVAC, and underpinning (if required) all interact with the egress timeline. Sequenced poorly, the project incurs rework — drywall opened twice for foundation cuts, wells excavated after backfill is finished. Sequenced correctly, the trades pass through the basement in a single coordinated wave and the project finishes 4 to 6 weeks faster.

This article walks through the right sequencing of egress within a Toronto basement apartment conversion in 2026, the trade dependencies, the inspection coordination, and the schedule template we use. For the egress-only framework, see our [Egress Window Installation Toronto: Complete 2026 Guide](/blog/egress-window-installation-toronto-2026-complete-guide). For the broader apartment legalization framework, see [Basement Apartment Legalization Toronto](/blog/basement-apartment-legalization-toronto). For multiplex scope, see [Multiplex Conversion Toronto: 2026 Complete Guide](/blog/multiplex-conversion-toronto-2026-complete-guide).

The Apartment Conversion Scope Stack

A typical Toronto basement apartment legalization in 2026 has the following scope items:

• Underpinning or floor lowering (if existing ceiling height is below OBC 9.10 minimum).
• Egress windows in each bedroom (one to three windows typical).
• Foundation waterproofing (interior or exterior, typically combined with underpinning).
• Fire separation between the basement unit and the upstairs unit (one-hour rated assemblies).
• Second exit from the basement (separate door to grade or shared stair).
• Kitchen (cabinets, counter, range, range hood, fridge, sink).
• Bathroom (full three-piece typical).
• Electrical separation (separate panel or sub-panel, ESA permit).
• HVAC (often a separate ducted system or sub-zone of central).
• Plumbing (sanitary, water, sometimes a sewage ejector).
• Drywall, flooring, paint (finishes throughout).
• Smoke and CO alarms (interconnected, hard-wired).
• Bylaw 569-2013 secondary suite registration (post-construction).

Egress is one of these. Its sequencing matters because the foundation cutting must happen before the interior framing of the bedroom partition (otherwise drywall is opened twice) but after any underpinning that lowers the basement floor.

The Right Sequence

The conversion sequence we use on Toronto basement apartments:

Phase 1 — Demolition (week 1). Strip existing basement to studs and slab. Identify obstructions for the egress cuts. Phase 2 — Structural (weeks 2–4). If underpinning or bench footing is required, this happens before egress cuts so the new finished floor elevation is established. The egress cut then sets the sill height relative to the new floor. Phase 3 — Egress cuts (week 4 or 5). Concrete cuts, lintel install, lintel inspection, well install, drainage tie-in. Done before any drywall or finishing on the affected walls. Phase 4 — Rough plumbing and rough electrical (weeks 5–7). With the egress windows in place and the structural envelope complete, MEP rough-in proceeds. Electrical includes the new sub-panel, circuit runs, and any wiring that had to be relocated to clear the egress cut. Phase 5 — Insulation and drywall (weeks 7–9). Insulation (closed-cell spray foam or batts depending on spec), vapour barrier, drywall. Fire-separation assemblies between the units are detailed during this phase. Phase 6 — Finishes (weeks 9–12). Flooring, kitchen install, bathroom install, paint, trim, doors. Phase 7 — Inspections and registration (weeks 12–14). Final building inspection, ESA inspection, smoke alarm verification, secondary suite registration with the City.

Total typical timeline: 12 to 14 weeks for a clean conversion. Egress windows sit in week 4 or 5 — early enough that the rest of the trades work around them, late enough that the underpinning (if any) has set the floor elevation.

Sequencing With Underpinning

If the project includes underpinning (basement floor lowering), the egress sequence changes:

• Underpinning happens first (weeks 2–6 typical for full perimeter underpin).
• New basement floor is poured at the lower elevation (week 6).
• Egress cuts are performed against the new floor (week 7). Sill height is set relative to the new lower floor.
• Project continues through the standard sequence from there.

Total timeline with underpinning: 18 to 22 weeks.

The reason for the order: if egress is cut before underpinning, the sill is set to the old floor elevation. After underpinning lowers the floor by 12 to 24 inches, the sill ends up too high relative to the new floor (above the OBC 1.0 m maximum). The cut has to be redone.

For underpinning context, see [Basement Underpinning Toronto: Complete 2026 Guide](/blog/basement-underpinning-toronto-2026-complete-guide).

Sequencing Without Underpinning

If the basement already has adequate ceiling height (rare but possible in homes built post-1990), underpinning is skipped and the sequence becomes:

• Demolition (week 1).
• Egress cuts (weeks 2–3). Performed early because the existing slab is the final floor.
• Rough plumbing and electrical (weeks 3–5).
• Drywall and finishes (weeks 5–10).
• Inspections (weeks 10–12).

Total: 10 to 12 weeks.

Egress and Fire Separation Interaction

Fire separation between the basement apartment and the upstairs unit is a one-hour rated assembly under OBC 9.10. The assembly typically runs along the basement ceiling (one-hour rated drywall) and around any wall penetrations.

Egress windows do not penetrate the fire separation — they are in the perimeter foundation wall, not the floor/ceiling assembly. So egress and fire separation don't physically conflict. But they share the inspection visit at final, and any deficiency in either holds up the registration.

Egress and Second Exit Interaction

OBC requires a basement apartment to have a second means of egress from the unit overall, in addition to the bedroom-level egress windows under 9.9.10. The second exit is typically:

• A separate exterior door from the basement to grade (most common).
• A shared interior stair to the upstairs unit, with appropriate fire-rated door (less common, requires fire separation review).
• A walkout door (which doubles as the primary access).

The second exit is part of the apartment-level egress. The bedroom-level egress windows are individual-bedroom protection. Both are required.

A walkout basement (covered in [Egress Window vs Walkout Basement Toronto](/blog/egress-window-vs-walkout-basement-toronto)) collapses the second exit and the bedroom egress into a single solution if every bedroom has direct access to the walkout area — but in practice most basement apartments have at least one bedroom that doesn't have direct walkout access, so egress windows still appear in the scope.

Cost Within an Apartment Conversion

The egress window line item in a typical Toronto basement apartment conversion in 2026:

• One-bedroom unit, one egress window: $5,500 to $9,500.
• Two-bedroom unit, two egress windows: $11,000 to $17,000 (amortization of fixed fees).
• Three-bedroom unit, three egress windows: $16,000 to $25,000.

Compare to the full apartment legalization budget of $45,000 to $90,000 for a one-bedroom and $60,000 to $120,000 for a two-bedroom. Egress is 15 to 20 percent of the typical conversion budget.

For the full apartment-conversion cost framework, see [Basement Apartment Legalization Toronto](/blog/basement-apartment-legalization-toronto).

Permit Coordination

A basement apartment conversion in Toronto requires:

• Building Permit covering all structural and finishing work, including the egress cuts.
• Plumbing Permit (often combined with Building Permit).
• ESA Permit for the electrical work.
• HVAC Permit if mechanical changes affect ducting.
• Secondary Suite Registration with the City (post-construction).

The egress cuts are inside the Building Permit. They do not need a separate permit. But the engineering for the cuts (PEng-stamped lintel detail) must be inside the permit drawing set, even though the permit covers a much broader scope.

RenoHouse's Coordinated Conversion

A typical RenoHouse basement apartment conversion runs 12 to 14 weeks (without underpinning) or 18 to 22 weeks (with underpinning). The egress scope is folded into the broader project. The cutting subcontractor, the engineer, the licensed electrician, and the plumber all coordinate through our project management.

[Book a consultation](/services/home-renovation/egress-window-installation) to start with the egress feasibility, and we will scope the full conversion if that is the direction.

For more, see our [Egress Window Installation Toronto: Complete 2026 Guide](/blog/egress-window-installation-toronto-2026-complete-guide), [Basement Apartment Legalization Toronto](/blog/basement-apartment-legalization-toronto), and [Multiplex Conversion Toronto: 2026 Complete Guide](/blog/multiplex-conversion-toronto-2026-complete-guide).