Standard Door Sizes in Canada
The Complete Guide to Interior, Exterior, Patio & Garage Door Dimensions
By Optima Windows & Doors · Updated June 2026
Get a Free MeasureThe 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 every standard size for interior, exterior, patio and garage doors – in inches and centimetres – with rough openings, Ontario code minimums, and custom options.
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 come in every standard size and are built for Canadian winters.
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 | 34" – 36" |
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
Frame your rough opening about 2" wider and 2½" taller than the slab to leave room for the frame, shims and levelling:
| 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. Rather than reframing (which adds cost and disturbs heritage trim), Optima manufactures locally and builds each door to your exact opening.
Common Measuring Mistakes to Avoid
Measuring the old door, not the opening: always measure the frame/rough opening, not the existing slab.
Ignoring door handing: note whether the door is left- or right-hand swing (stand outside; the side the hinges are on is the hand).
Forgetting clearance: floor finishes, thresholds and weatherstripping all affect the final height – leave room or have a pro measure.
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 doors are typically 36" wide. Interior widths range from 24" to 36": bedrooms and living areas are 30"-32", bathrooms 28"-30", closets 24"-28", and barrier-free doorways 34"-36".
What rough opening do I need for a 36-inch door?
Frame the rough opening about 2" wider and 2½" taller than the slab - roughly 38" wide x 82½" tall for a standard 36" x 80" door - to leave room for the frame, shims and levelling.
What is the minimum door width under the Ontario Building Code?
For barrier-free (accessible) access, the Ontario Building Code generally requires a clear opening of at least 32 inches (810 mm). Most exterior entry doors are 36" to comfortably exceed this.
Can I order a custom-size door?
Yes. Because Optima manufactures locally, we build doors to your exact opening - so non-standard sizes in older Toronto and GTA homes don't require costly reframing. Call (647) 800-6973 for a free in-home measure.
