How to Measure Interior Doors Correctly Before Ordering in Toronto & the GTA (2026)

Ordering the correct interior door starts with accurate measurements. Whether you're replacing a single bedroom door or renovating your entire home, taking the right measurements can save time, money, and prevent costly mistakes.

At RenoPro Co., we help homeowners, contractors, and builders throughout Toronto, Vaughan, Richmond Hill, Markham, Mississauga, Brampton, Oakville, Pickering, Ajax, Whitby, Oshawa, and the Greater Toronto Area (GTA) choose the perfect interior doors every day.

Why Accurate Door Measurements Matter

One of the biggest reasons homeowners order the wrong interior door is incorrect measurements. Even being off by half an inch can result in installation delays and additional costs.

Proper measurements ensure:

• Perfect door fit
• Smoother installation
• Less trimming and adjustments
• Better sound insulation
• Professional appearance

Step 1: Measure the Existing Door

Remove the door if possible and measure:

• Door Width
• Door Height
• Door Thickness

Most Canadian homes use standard sizes such as:

• 18" × 80"
• 20" × 80"
• 24" × 80"
• 26" × 80"
• 28" × 80"
• 30" × 80"
• 32" × 80"
• 34" × 80"
• 36" × 80"

Step 2: Measure the Rough Opening

If you're installing a new pre-hung door, measuring the rough opening is the most important step.

Measure:

• Width from stud to stud
• Height from floor to header
• Wall thickness

A properly measured rough opening allows your pre-hung door to fit correctly without major modifications.

Step 3: Determine Door Swing

Before ordering, determine:

• Left Hand
• Right Hand
• Left Hand Reverse
• Right Hand Reverse

Knowing the correct handing ensures your new door opens exactly as intended.

Pre-Hung vs Slab Doors

If your frame is damaged or you're doing a complete renovation, a pre-hung door is usually the best option. If your existing frame is still in excellent condition, replacing only the slab may be enough.

Browse our complete collection of Pre-Hung Interior Doors for quick installation.

If you're replacing only the door itself, view our Interior Door Slabs.

Choosing the Right Door Style

Modern shaker doors remain one of the most popular choices throughout Toronto and the GTA because they match both contemporary and traditional homes.

Popular options include:

• 1 Panel Shaker
• 2 Panel Shaker
• 3 Panel Shaker
• Berkley Doors
• Solid Core Doors

Our Solid Core Interior Doors provide excellent durability, privacy, and sound reduction for bedrooms, offices, and living spaces.

Common Measuring Mistakes

• Measuring only the old door
• Ignoring wall thickness
• Ordering the wrong handing
• Forgetting door thickness
• Not checking floor clearance
• Guessing rough opening dimensions

Interior Doors Available Across the GTA

RenoPro Co. supplies premium interior doors to homeowners and contractors throughout:

• Toronto
• Vaughan
• Richmond Hill
• Markham
• Thornhill
• Mississauga
• Brampton
• Milton
• Oakville
• Burlington
• Ajax
• Pickering
• Whitby
• Oshawa
• Aurora
• Newmarket
• King City
• Woodbridge

Need Help Measuring Your Door?

Our experienced team can help you choose the correct size, handing, style, and jamb depth before you place your order. Whether you're replacing one interior door or renovating an entire home, RenoPro Co. makes the process simple.

For additional information about standard residential door sizes and building practices, visit the Natural Resources Canada website.

Order Interior Doors in Toronto & the GTA

RenoPro Co. offers premium solid core and pre-hung interior doors with competitive pricing, fast turnaround, and delivery across Toronto, Vaughan, Richmond Hill, Markham, Mississauga, Brampton, and the Greater Toronto Area.

Explore our collections today and find the perfect interior door for your next renovation project.