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How to measure windows for blinds and curtains

Measuring yourself is a great way to get an early price. As installers, here is the method we use and the mistakes we see most often on site.

Muhammed Ali Kurt · MakDekor ·

First decide: inside or outside mount?

Before picking up the tape, decide where the blind will be fixed – the method depends on it.

Inside mount (in the recess) Outside mount (on the wall)
Where it goes Inside the window opening On the wall or ceiling above it
Look Clean, frame stays visible Window looks larger
Light blocking Some light can leak at the sides Better, thanks to the overlap
Best for Recesses with enough depth Shallow recesses, bedrooms, inward-opening windows

An inside mount only works if the recess is deep enough for the headrail of an aluminium blind or roller blind and the window handle does not hit the blind. We check this depth at the visit.

What you need

Note every measurement to the nearest millimetre or half centimetre, and always write width first, then height. That simple habit prevents mix-ups when ordering.

Measuring for an inside mount

  1. Width: measure inside the recess at the top, middle and bottom. Use the narrowest figure.
  2. Height: measure on the left, in the middle and on the right. Again, note the shortest.
  3. Depth: measure from the window frame to the front edge of the recess, and note where the handle and hinges sit.
  4. Do not make your own deductions. Write down the actual size – we allow the small manufacturing tolerance at the workshop.

Why the narrowest? Walls and plaster are rarely perfectly straight. A blind ordered from a single mid-point measurement may not fit a recess that narrows towards the bottom.

Measuring for an outside mount

  1. Width: measure the opening and add 5–10 cm on each side.
  2. Height: measure from where the blind will be fixed (usually 5–10 cm above the opening) down to below the sill or wherever you want it to finish.
  3. Check there is enough flat wall above the window for the headrail.
  4. Note any obstacles at the sides – sockets, wardrobes or a corner.

For bedrooms where darkness matters, especially with blackout blinds, go for the upper end of the overlap.

Measuring for curtains and sheers

Sheer curtains and drapes on tracks or poles are measured differently:

Common mistakes

Holiday home? Measure smart

If you own a flat in Antalya but are not here, a rough measurement plus a photo of each window – taken straight on, with the tape visible – is enough for us to prepare options and a quote. The exact measuring is then done on site before production.

Our team measures for free anyway

Your own measurements are very useful for a quote and for choosing products. Before anything is ordered, though, our team measures on site free of charge in our service areas around Antalya. That way we see the recess depth, the handle position and how straight the walls are, and responsibility for the fit stays with us. Send your figures and a photo of each window via our contact page and we will arrive prepared. For a first idea of cost, see our prices page; why it matters who measures is explained in our guide to choosing a blinds installer.

Frequently asked questions

Why measure the width in three places?

Window recesses are rarely perfectly square. Measuring at the top, middle and bottom and using the narrowest figure makes sure an inside-mount blind fits everywhere.

How much overlap for an outside mount?

Add 5–10 cm on each side of the opening. That reduces light leaking round the edges and makes the window look larger.

Can I order with my own measurements?

They are fine for a quote. Before ordering, our team checks everything on site free of charge, so a measuring error is never your risk.

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