Standard Exterior Door Sizes for Canadian Homes

Standard Exterior Door Sizes in Canada

The short answer: the most common exterior door sizes in Canada are 32″ × 80″, 34″ × 80″, and 36″ × 80″. For front doors, 36″ × 80″ is one of the most popular sizes, especially in newer homes and modern entryways. However, older Canadian homes, side entrances, custom front doors, and door systems with sidelights or transoms may require different measurements.

For most residential exterior doors, the standard height is usually 80 inches. Widths can vary depending on the location of the door and the age of the home.

Common exterior door sizes include:

• 32″ × 80″ — often used for older homes, side doors, back doors, and smaller exterior entrances.
• 34″ × 80″ — a common residential exterior door size in many Canadian homes.
• 36″ × 80″ — one of the most common choices for front entry doors and modern replacement projects.

If you are replacing the entire door system, the slab size is only one part of the measurement. The frame, jamb depth, rough opening, threshold, sidelights, transom, and installation method can all affect the final size you need.

Common Exterior Door Sizes in Canada

Most replacement projects fall into a few common size categories, but the right choice depends on the full door system — not just the visible door slab.

A standard single front door is often 36 inches wide by 80 inches high, but this does not mean every home has the same opening. Older Canadian homes may have narrower doors, while newer homes may use taller 84-inch or 96-inch entry doors for a more modern look.

Door Slab, Frame, and Rough Opening: What Is the Difference?

When homeowners talk about “door size,” they often mean different things. This is one of the most common reasons for ordering the wrong replacement door.

Door slab size means the size of the actual door panel only. For example, a 36″ × 80″ door slab is the door itself, without the frame.

Prehung door size means the door slab already installed in a frame. This is the most common option for exterior door replacement because the frame, threshold, hinges, and weatherstripping are replaced together.

Rough opening means the framed opening in the wall before the door unit is installed. It is usually larger than the door unit to allow room for leveling, shimming, insulation, and proper installation.

Jamb depth is the distance from the interior side of the door frame to the exterior side of the wall. This measurement matters because Canadian homes can have different wall thicknesses depending on age, construction type, brickwork, insulation, and interior finishes.

For a proper exterior door replacement, it is not enough to measure only the old door slab. The installer should also check the frame, jamb depth, rough opening, threshold, swing direction, and whether the door has sidelights or a transom.

Typical Measurements to Confirm Before Ordering

Before ordering a new exterior door, confirm these measurements:

This is especially important for front doors with glass inserts, sidelights, transoms, or custom trim. In these cases, the full system size matters more than the door slab size alone.

How to Measure an Exterior Door for Replacement

Before ordering a new exterior door, you need to confirm whether you are replacing only the door slab or the full door system. In most exterior door replacement projects, the full prehung unit is replaced, including the slab, frame, threshold, hinges, and weatherstripping.

To measure an exterior door correctly, check the following:

1. Measure the door slab width
   Measure the actual door panel from side to side. Common slab widths include 32″, 34″, and 36″.
2. Measure the door slab height
   Measure from the top of the door slab to the bottom. Most standard exterior doors are 80″ high, but some newer or custom homes may use 84″ or 96″ doors.
3. Measure the frame size
   If you are replacing the full unit, measure the outside dimensions of the existing frame. This helps determine the correct prehung door size.
4. Check the jamb depth
   Jamb depth is the depth of the frame through the wall. This is important because Canadian homes can have different wall thicknesses depending on brick, insulation, interior finishes, and construction age.
5. Confirm the rough opening
   The rough opening is the structural opening in the wall. It is usually larger than the door unit to allow space for shimming, leveling, insulation, and proper installation.
6. Check the swing direction
   Confirm whether the door is inswing or outswing, and whether it is left-hand or right-hand. This affects both ordering and installation.
7. Measure sidelights or transoms if present
   If your front door has sidelights, a transom, or decorative glass panels beside or above the door, measure the full system — not just the door slab.

Accurate measurements are especially important for older Canadian homes, custom entryways, brick openings, and front doors with sidelights or transoms. Even a small measuring mistake can affect the fit, sealing, locking, and long-term performance of the new door.

“Precise measurements are the foundation of a proper exterior door installation. The slab, frame, jamb depth, and rough opening all need to be checked before ordering a replacement door.”

— Valentyn Grabar, Elegant Entry Doors Sales Manager

What Affects the Cost of an Exterior Door Replacement?

The size of the exterior door is only one part of the final replacement cost. Two doors can have the same standard size, but the total project price may be very different depending on the material, glass, hardware, frame condition, and installation complexity.

The main factors that affect the cost include:

• Door type — a single front door, double door, patio door, garden door, or front door with sidelights will all have different price ranges.
• Door material — steel, fiberglass, wood, vinyl, and aluminum systems vary in durability, insulation, maintenance, and cost.
• Glass options — decorative glass, frosted glass, Low-E glass, triple-pane glass, sidelights, and transoms can increase the price.
• Door size — standard 32″, 34″, and 36″ doors are usually easier to replace than oversized or custom-height doors.
• Frame condition — if the existing frame, sill, or surrounding wood is damaged, repairs may be needed before installation.
• Hardware and security — smart locks, keypad locks, multi-point locking systems, reinforced strike plates, and premium handles can add to the cost.
• Custom design — custom colours, stains, panels, grills, glass inserts, and non-standard configurations usually cost more than stock options.
• Installation complexity — brick openings, older homes, uneven framing, and resizing the rough opening can increase labour time.

For homeowners, the most important point is this: a standard door size does not always mean a standard installation. The final price depends on the full door system and the condition of the existing opening.

If you are comparing estimates, make sure each quote includes the same items: the door slab, frame, threshold, weatherstripping, glass, hardware, removal of the old door, installation, sealing, and warranty.

Helpful Resources

Related Guides from Elegant Entry Doors

• Front Door Options — Explore modern front door styles, materials, glass options, and design ideas.
• Fiberglass Entry Doors — Learn about fiberglass entry doors and when they are the right choice for Canadian homes.
• Steel Entry Doors — Compare steel entry doors for durability, security, insulation, and long-term value.
• Door Hardware — Review handles, locks, smart locks, and hardware options for exterior doors.
• Front Door Security Guide — Learn how locks, frames, glass, strike plates, and installation affect front door security.
• Doors 101 — Browse more homeowner guides about exterior doors, entry doors, styles, materials, and replacement tips.

External References

• Ontario Building Code
• National Building Code of Canada