Getting new blinds is one of the quickest ways to transform a room — better light control, more privacy, and real protection from Queensland's intense sun. But before any of that happens, you need accurate measurements. Get them wrong and you're looking at gaps that let in glare, blinds that won't close properly, or a return trip from your installer.
The good news? Measuring your windows is straightforward when you know what you're doing. This guide walks you through it step by step, so you can feel confident before your free measure and quote — or simply understand what our team is doing when we visit your home across the Sunshine Coast.
---
What You'll Need Before You Start
Grab these before you begin:
- A steel tape measure (fabric tapes stretch and give inaccurate readings — avoid them)
- A notepad and pen, or your phone to record measurements
- A pencil to mark reference points if needed
One important decision to make upfront: are you mounting your blinds inside the window recess (inside mount) or outside the recess, covering more of the wall (outside mount)? This affects how and where you measure, so nail this down first.
Inside mount gives a clean, built-in look and is popular in modern Sunshine Coast homes. Outside mount is better when your recess is too shallow, or when you want to make a window appear larger — handy in compact bedrooms or older-style homes around Caloundra and Maroochydore.
---
How to Measure for an Inside Mount
For an inside mount, you're measuring the internal dimensions of the window recess — the space the blind will sit within.
Width: Measure the width of the recess at three points — top, middle, and bottom. Windows aren't always perfectly square, especially in older homes. Record the smallest of the three measurements. Your blind manufacturer will typically deduct a few millimetres for clearance, but you want to give them the actual recess size, not a pre-adjusted figure.
Height: Measure the height at three points — left side, centre, and right side. Again, record the smallest measurement.
Recess depth: This one's often forgotten. Measure how deep the recess is from the front of the frame to the glass (or flyscreen, if there is one). Most roller blinds need at least 60–80mm of depth to sit flat and operate properly. Plantation shutters need even more. If your recess is too shallow, an outside mount is the smarter call.
Write down all measurements in millimetres. Centimetres are fine for furniture shopping — not for blinds.
---
How to Measure for an Outside Mount
An outside mount blind sits on the wall or architrave above and around the window, so you're measuring the total area you want the blind to cover — not just the recess.
Width: Decide how far each side of the blind will extend beyond the window frame. A common rule of thumb is 50–100mm on each side. This blocks side light and makes the window look wider. Measure from your intended left edge to your intended right edge.
Height: Measure from where the bracket will sit (usually above the architrave) down to where you want the blind to end — typically the window sill, or just below it. If you're in a room that cops direct afternoon sun (a common issue for west-facing rooms in Buderim and Noosa), going a little longer helps eliminate that low-angle glare.
For outside mounts, you control the final dimensions, so double-check your numbers before ordering. There's no recess to act as a guide.
---
Common Measuring Mistakes (and How to Avoid Them)
Even careful DIYers run into these:
- Measuring only once. Always measure three times per dimension and use the smallest figure. Windows are rarely perfectly uniform.
- Using the wrong tool. A steel tape measure is non-negotiable. A laser measure works too, but a fabric tape will cost you accuracy.
- Forgetting obstructions. Check for window handles, locks, or tilt mechanisms that could interfere with how a blind operates. This is especially relevant for louvred windows common in coastal Sunshine Coast homes.
- Confusing width and height. Always write width first, then height (W x H). It's the industry standard and avoids expensive mix-ups.
- Ignoring the recess depth for inside mounts. A blind that can't fit flush in the recess will stick out and look awkward — or simply won't function.
Queensland's climate adds another layer to consider. With the humidity and UV intensity we get across the Sunshine Coast, the right blind material matters as much as the right fit. A blockout roller blind that's even slightly too narrow will let light spill in around the edges — defeating the purpose on a blazing summer afternoon.
---
When to Skip the DIY and Call a Professional
Measuring a straightforward rectangular window in a modern home? You've got this. But there are situations where it's genuinely worth having a professional measure up:
- Arched, angled, or bay windows
- Large windows or floor-to-ceiling glass panels
- Motorised blinds (where bracket placement and wiring need to be factored in from the start)
- Plantation shutters, which require precise panel calculations
A wrong measurement on a standard roller blind is an inconvenience. A wrong measurement on a set of plantation shutters or a motorised system is a costly one.
The other thing worth knowing: our team has measured hundreds of windows across Noosa, Kawana, Coolum, and everywhere in between. We've seen the quirks — the windows that aren't square, the recesses that are shallower than they look, the north-facing glass that needs serious UV protection. A free in-home measure and quote doesn't just save you the stress of getting it wrong. It means your blinds will fit perfectly, first time.
---
Ready to get it right from the start? Book your free in-home measure and quote today — our team will handle the measuring, recommend the right product for your windows and your Queensland lifestyle, and give you a clear, no-pressure quote.