How to Measure Your Windows and Doors for Replacement
Before you pick out the perfect window or door, you’ll need one thing — accurate measurements. Here’s how to prepare like a pro (without doing it yourself).
Home upgrades often start with excitement — new windows or doors can improve comfort, cut energy costs, and boost curb appeal. But for many homeowners in Edmonton, AB, that excitement is met with hesitation when it comes to one thing: measuring.
It’s not surprising. The thought of measuring windows or doors for replacement can spark anxiety — What if I mess it up? What if I give the wrong numbers? What if it delays the whole project?
This guide is here to calm those nerves. It’s not a DIY tutorial. Instead, it walks through how to gather the right info — for professionals to handle the rest. Think of it as prep work that keeps you in control of your quote, timeline, and peace of mind.
Here’s what we’ll cover:
- What tools to have ready
- Which measurements matter (and which don’t)
- How to record dimensions clearly
- What to watch for when checking windows and doors
- Common mistakes to avoid
Whether you’re upgrading before Edmonton’s frosty winter hits or just starting to explore your options for windows and doors near me, this is your go-to pre-quote playbook.
Before You Begin: The Measuring Mindset
Let’s start with a quick reminder: you’re not expected to be perfect. These measurements aren’t for ordering — just for getting accurate quotes and helping installers understand what you need.
Here’s how to get into the right mindset:
✔ What Not to Worry About:
- Getting every millimetre exact
- Matching what the pros will measure later
- Understanding every part of the frame
Just aim to be consistent and clear. That alone puts you miles ahead.
🛠 Tools to Have Ready:
- A steel tape measure (metric preferred — you’re in Canada after all)
- A notepad or phone to record measurements
- A flashlight, in case lighting’s not great
- A step stool, if needed for higher windows
Optional but helpful: A marker to label windows by room.
📏 Language to Use:
When sharing your numbers with installers, use this simple format:
Width x Height (W x H), in millimetres
Include basic window or door type (e.g., slider, crank, entry door with sidelights) and location (e.g., kitchen, upstairs bath).
How to Measure Windows for Replacement Quotes
Windows may look uniform at first glance — but looks can be deceiving. Measuring each one separately avoids surprises later.
📐 Measure the Width:
- Take three horizontal measurements: top, middle, bottom
- Go from inside frame to inside frame — the visible glass frame, not the casing or trim
- Record all three, and note the smallest — this gives your best safe starting point
📏 Measure the Height:
- Again, take three vertical measurements: left, centre, right
- Use the same inside frame-to-frame approach
- Note any unusual angles or visible warping
🔄 Special Shapes or Styles:
For unique window types:
- Casement windows (crank-style): note direction they open
- Bay or bow windows: measure each section separately
- Fixed or picture windows: just measure the main glass area
Pro tip (okay, semi-pro): Don’t assume symmetry. Older homes in Edmonton often shift slightly over time. So yes, it’s worth checking each window on its own.
How to Measure Doors for Replacement Quotes
When it comes to doors, the stakes can feel higher — after all, it’s your main point of entry. And things like swing direction and sidelights make quoting a bit more nuanced.
📐 Measure the Door Opening:
- Measure width across the inside frame (not the door slab)
- Measure height from threshold (bottom sill) to the top inside frame
- Record both in millimetres as Width x Height (W x H)
🚪 Don’t Forget These Details:
- Hinge placement: Left or right when viewed from outside
- Door swing: Inward or outward
- Sidelights or transoms: Measure them separately if present
If the doorframe looks damaged, bowed, or heavily weathered, jot that down too. It helps installers prep their quote and timeline accordingly.
Oh, and here’s a small but common hiccup — many homeowners forget that front and back doors aren’t always the same size. It’s worth double-checking.
Recording and Sharing Your Measurements
Here’s the thing — even if you measure perfectly, unclear notes can cause hiccups. So let’s simplify the process.
📝 How to Write Measurements:
Use this consistent format:
- Window A – Living Room – Slider – 1,200 mm (W) x 1,000 mm (H)
- Window B – Upstairs Bath – Casement Left – 800 mm (W) x 1,200 mm (H)
- Main Entry – Right In-Swing – 910 mm (W) x 2,030 mm (H)
Add a quick sketch or diagram if you’re a visual thinker. Even a floorplan screenshot with numbered windows can be helpful.
🔄 How Installers Use This Info:
Your numbers give professionals an early idea of:
- Product scope
- Time and crew needed
- Ballpark material sizing
- Any structural or wall-depth considerations
Don’t worry about technical specs like “jamb extension” or “brickmould depth” — that’s what the pro visit is for. This just kickstarts the quoting conversation with clarity.
Common Measuring Mistakes (And How to Dodge Them)
This is where most homeowners get tripped up — and where small tweaks can save big time.
🚫 Mistake #1: Assuming Windows Are All the Same Size
Truth: They rarely are. Even two windows in the same room might differ slightly. Always measure each one.
🚫 Mistake #2: Measuring the Trim or Casing
Avoid measuring the outer decorative parts. Focus on the actual frame opening — that’s what replacement units fit into.
🚫 Mistake #3: Ignoring Damage or Warping
Even small frame shifts can affect installation. If a window looks crooked, swollen, or cracked, make a note of it. The pros will confirm, but your heads-up is helpful.
🚫 Mistake #4: Forgetting Window Operation
Sliding, crank, fixed — it matters. Operation types affect sizing tolerances and product selection.
🚫 Mistake #5: Rounding Too Aggressively
Yes, you’re just prepping for a quote. But if a width is 1,228 mm, don’t round it to 1,200. Stick to what you see — the pros will round safely if needed.
Final Tips for Quote-Ready Confidence
Let’s be real: no one wants a call saying “actually, these measurements don’t work.” A bit of care now prevents rework later.
✅ Summary of Key Points:
- Measure inside the frame, not the trim
- Record width first, then height (W x H)
- Include window type and room location
- Take notes on swing, hinge, or unique details
- Don’t stress about precision — just consistency
🌟 Takeaway:
You’re not replacing the windows and doors yourself — you’re preparing the info professionals need to get it right. That’s a major win.
And if you’re searching for windows and doors in my area — especially around Edmonton — having your dimensions handy speeds up the consultation, quote, and installation planning.
Ready to move forward? Reach out to a trusted local provider to discuss your quote and upgrade options.
FAQs (Frequently Asked Questions)
❓ What if my windows are different sizes?
A: Totally normal. Most homes — even new ones — have a mix of sizes. Measure each one individually, and label them by room. That keeps everything clear.
❓ Do I include the window frame in my measurement?
A: Not the outer frame or trim. Just the visible glass frame — inside to inside. Your installer will do full-frame checks during the home visit.
❓ What if I’m not confident in my measurements?
A: That’s okay. Your measurements are just a starting point for quotes. The final specs will always be confirmed before anything gets ordered.
FUQs (Frequently Unasked but Important Questions)
❓ Should I note how each window opens (like sliding vs. crank)?
A: Yes — especially for casement or tilt windows. Operation type can impact replacement choices and how the unit is measured or installed.
❓ Does my home’s age affect how I measure?
A: It can. Older homes in Edmonton may have shifted or settled frames. That’s why multiple measurements (top, middle, bottom) help catch those variations.
❓ Do I need to measure wall depth?
A: Not necessarily — but if you notice very deep or shallow walls, mention it. It helps pros prep for proper trim or casing solutions.
The Bottom Line?
Having your measurements ready doesn’t mean you’re doing it all yourself. It means you’re paving the way for better, faster, more accurate help from professionals.
And that’s what makes the difference.
Looking for windows and doors near me in Edmonton? Start the conversation today — with dimensions in hand and confidence on your side.