Standard Door Sizes in Canada
The Complete Guide to Interior, Exterior, Patio & Garage Door Dimensions
By Optima Windows & Doors · Updated September 2026
Book a Free AssessmentCall (647) 800-6973The standard door size in Canada is 36 inches wide by 80 inches tall (3'0" × 6'8") for exterior doors, and 30–32 inches wide by 80 inches tall for interior doors. Below you'll find common sizes for interior, exterior, patio and garage doors – in inches and centimetres – with rough openings, Ontario code considerations, and custom options.
Sizing windows for the same project? See our companion guide: standard window sizes in Canada.
Quick Reference: Standard Door Sizes
| Door type | Standard width | Height | Thickness |
|---|---|---|---|
| Exterior / entry | 36" (32"–36") | 80" | 1¾" |
| Interior | 30"–32" (24"–36") | 80" | 1⅜" |
| Patio / sliding | 60", 72", 96" | 80" | – |
| French / double | 60"–72" (pair) | 80" | 1¾" |
| Garage (single) | 8'–9' | 7' | – |
Standard Exterior & Entry Door Sizes
The standard front door size in Canada is 36" wide × 80" tall (3'0" × 6'8"), with a 1¾" thickness for strength and insulation. Narrower 30", 32" and 34" widths suit side and secondary entrances.
Our fibreglass entry doors and Toronto front doors offer options for Canadian homes. Confirm the available sizes, materials and glass configuration during your assessment.
Standard Door Height
Standard door height is 80 inches (6'8") for interior and exterior doors. Newer and luxury GTA homes increasingly use 84" (7') or 96" (8') doors for a more open, modern look with taller ceilings.
Standard Interior Door Sizes
Interior doors are 80" tall and 1⅜" thick; width is chosen by room:
| Room | Typical width |
|---|---|
| Bedrooms & living areas | 30" – 32" |
| Bathrooms | 28" – 30" |
| Closets & utility | 24" – 28" |
| Accessible / barrier-free | Specify the required clear opening, not just slab width |
Closet, Bifold & Pocket Door Sizes
Closet openings commonly use bifold or sliding doors in 24", 30", 36", 48" and 60" widths at 80" tall. Pocket doors follow the same widths but need a wall cavity roughly double the door width to slide into.
Garage Door Sizes
A standard single garage door is 8'–9' wide × 7' tall; a double garage door is 16' wide × 7' tall. Taller 8' doors are common for trucks and SUVs.
Rough Opening & Frame Sizes
A · Rough opening: structural opening for the complete assembly and installation clearance.
B · Frame: the jambs and threshold around the door.
C · Slab: the moving door panel. Its nominal size does not give the frame size.
Clear opening: usable passage with the door open, accounting for the door and hardware.
The rough opening is the structural opening around the complete door assembly. The following are planning examples based on a common allowance of about 2 inches in width and 2½ inches in height over the slab size. Frame and threshold designs vary. Use the selected manufacturer’s installation dimensions before framing or ordering.
| Door size | Rough opening (W × H) |
|---|---|
| 30" × 80" | ~32" × 82½" |
| 32" × 80" | ~34" × 82½" |
| 36" × 80" | ~38" × 82½" |
Door Sizes in Centimetres (Metric)
| Imperial | Metric |
|---|---|
| 30" × 80" | 76 cm × 203 cm |
| 32" × 80" | 81 cm × 203 cm |
| 36" × 80" | 91 cm × 203 cm |
Patio & Sliding Door Sizes
Sliding and patio doors commonly come in 60", 72" and 96" widths at 80" tall, with larger multi-panel options for wide openings onto a deck or garden.
Planning a budget? Our cost calculator gives an instant estimate by size.
Door Sizes in Older Toronto & GTA Homes
Pre-war and century homes across Toronto – from Cabbagetown and The Annex to East York and the Beaches – were often built before today's standards, so openings can be narrower, shorter, or out of square. The same is true for many older homes in Mississauga, Brampton, Vaughan and Hamilton. An assessment can establish whether a suitable replacement assembly fits the opening or whether changes to the frame, threshold or structure are needed. Ask about available custom-size options before deciding to reframe.
Common Measuring Mistakes to Avoid
Mixing up measurements: a replacement slab and a full prehung assembly need different measurements. Record the existing slab, frame and opening where accessible, and have final ordering dimensions checked on site.
Ignoring door handing: photograph the hinges and show which way the door opens. Handing conventions vary by supplier, so confirm the required designation before ordering.
Forgetting clearance: floor finishes, thresholds and weatherstripping all affect the final height – leave room or have a pro measure.
For project-specific requirements, consult Ontario’s building-code accessibility guidance and your municipal building department.
Frequently Asked Questions
What is the standard door size in Canada?
The standard exterior/entry door is 36 inches wide by 80 inches tall (3'0" x 6'8") and 1¾" thick. The most common interior door is 30" or 32" wide by 80" tall and 1⅜" thick.
What is the standard door height?
Standard door height is 80 inches (6'8") for both interior and exterior doors. Taller 84" (7') and 96" (8') doors are common in newer and luxury GTA homes with 9' or 10' ceilings.
What is the standard door width?
Exterior entry doors are commonly 36 inches wide. Interior widths vary by room and product, often from 24 to 36 inches. Accessible doorways must be selected for the required clear opening and applicable code, not by nominal slab width alone.
What rough opening do I need for a 36-inch door?
A 38 by 82½ inch rough opening is a common planning example for a 36 by 80 inch slab, but it is not a universal ordering dimension. Use the specifications for your selected prehung frame, threshold and installation method, confirmed by an on-site measurement.
What is the minimum door width under the Ontario Building Code?
Requirements depend on the building, doorway and applicable code provisions. Clear opening is measured with the door open and is different from nominal slab width. Confirm accessibility and exit requirements for the project with your designer or municipal building department before ordering.
Can I order a custom-size door?
Ask Optima about the sizes and configurations available for your project. An assessment will establish whether a replacement can fit the existing opening or whether framing changes are needed. Book online or call (647) 800-6973 for a free in-home assessment.
