How to Measure Your Window for Security Bars Correctly

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To measure a window for security bars, take the width and height of the opening at three points each, use the smallest figure, and note the depth of the frame and any obstacles such as handles or shutters. Record everything in centimeters on a simple sketch, then share it with the manufacturer for a custom fit.

Why accurate measurements matter

Security bars are made to measure, so the numbers you send decide how well they fit. A bar that is even a few millimeters too large may not go in at all, while one that is too small leaves a gap that defeats the purpose of the bars. Taking careful measurements once saves time, avoids rework and makes installation smoother for everyone involved.

Before you start, gather a steel measuring tape, a pencil, paper and a helper if the window is high. Work in centimeters and write each figure down immediately rather than trusting your memory.

Measure the width of the opening

Measure the width of the window opening from inside the frame, from one side to the other. Take the measurement at the top, middle and bottom, because walls and frames are rarely perfectly straight.

Write down all three readings.
Use the smallest of the three as your working width.
Note whether the frame is wood, aluminum or masonry, since this affects how the bar is fixed.

Measure the height of the opening

Next, measure the height from the sill to the top of the frame. As with the width, take readings at the left, centre and right, since the top or sill may not be level.

Keep the same approach: record three values, then use the smallest. If the window has a roller shutter box or a lintel that protrudes into the opening, measure up to that obstruction and mention it in your notes.

Check the depth and frame profile

Depth tells the manufacturer how far the bars can sit from the glass and how they should be fixed. Measure from the outer face of the frame to the inner wall or reveal, and check whether the window opens inward or outward.

Photograph the frame edge from close up. A clear photo lets the workshop see the profile, which is often more useful than a written description alone.

Note obstacles and opening mechanisms

Anything that interrupts the opening must be recorded. Handles, latches, hinges, air-conditioning pipes, electrical boxes and window cranks all affect where a bar can sit and how it must be designed.

Mark the position of handles on your sketch.
Note if the window is a tilt-and-turn or sliding type.
Mention any spot where a bar must be removable for emergency exit.

Make a simple sketch and send it with photos

A rough drawing helps more than you might expect. Draw the window as a rectangle, label width and height at each point you measured, and mark obstacles with arrows. Add the date and the floor or room name so you can match it to the right window later.

Send the sketch together with several photos taken straight on and at an angle. This gives the workshop enough information to draft a written specification before any metal is cut.

Confirm the final details with the factory

Once your figures are ready, the factory can check them against the drawing and photos and advise on bar spacing and fixing. Safety rules for railings and guards in Israel are covered by the SI 1142 standard, and the engineer confirms the exact values for your specific installation. Ask for the specification in writing and review it before approving production.

Frequently asked questions

How many measurements should I take for each dimension?

Take three readings for both width and height, at the top, middle and bottom or left, centre and right. Use the smallest value so the bars will fit everywhere within the opening.

Should I measure the outside or inside of the frame?

Measure the clear opening inside the frame for width and height, and measure depth from the outer frame face to the inner reveal. This matches how the bars are fitted to the window.

Can I send photos instead of measuring myself?

Photos help a lot, but they cannot replace measurements. Ask the factory whether they offer an on-site measurement visit before production starts.

What if my window has a shutter or roller box?

Record the shutter box, its depth and its position on your sketch. The bars must clear moving parts, so the factory needs to know exactly where they sit.

Common mistakes to avoid

Measuring only once or using the largest figure is the most common error, as it leads to bars that do not fit. Forgetting obstacles such as handles, pipes or shutter boxes can also force an expensive redesign.

Our recommendation

Measure twice, write every figure down in centimeters, and send a clear sketch with photos before you order. Ask the factory to confirm the measurements in a written specification so you approve the exact dimensions in advance.

Summary

Measure width and height at three points each, record depth and obstacles, then send a sketch and photos. Accurate figures give you security bars that fit the first time.

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