Measuring Windows Guide: How to Measure Windows

We often get asked the best way to measure windows, so we’ve put together a quick guide on how to get a flawlessly finished product that’s the perfect fit.

Before you measure the windows, complete a few simple checks

Before measuring the windows, you’ll need to do some simple precautionary checks to ensure installing new windows won’t cause any problems:

• Look out for loose bricks, satellite dishes, aerials or telephone wires
• Check to see there are no damp patches
• Be aware of any damages

These issues could indicate structural problems within the property and may need looking at by a builder or surveyor.

If the replacement windows will have a different opening style to the old ones, it’s also a good idea to check there will be nothing that will obstruct the windows and get in the way when they’re fully opened. Things like fences or protruding fascias can cause issues.

Tape measures at the ready

We recommend measuring the height, the width and then checking your measurements are square.

Measuring the window height

To measure the height of a window, make 3 vertical measurements, ideally in mm.

Measure from the outside, brick to brick from the left, middle and right of the opening.

If there’s any variation in the 3 measurements, use the smallest.

Then, deduct deduct installation tolerances as required from the final height.

Measuring the window width

To measure the width of a window, much like measuring the height, make 3 measurements in mm from the outside.

This time, they need to be measured brick to brick horizontally from the top, bottom and middle of the opening.

Again, if there’s any variation, use the smallest measurement and deduct installation tolerances as required from the overall measurement.

Final checks

To double check that the window opening is square, measure both diagonals and ensure that most measurements are the same.

Depending on how deep the window frame that you’re replacing is, you might need to remove some of the plaster from the inside window reveal and use a cover trim on any gaps.

We make all of our uPVC and aluminium windows at our Perivale factory, so we can ensure that they’re made to the highest standards, are easier to install and meet Building Regulations

As well as ensuring new windows are the right fit, it’s also important that they meet Building Regulations for security, energy efficiency and fire safety.

To comply with Building Regulations for security, windows must be robust, fitted with appropriate hardware, has been tested and meet security standards, and the easily accessible windows should be secure enough to resist a physical attack.

Building Regulations also state a minimum level of energy efficiency for windows, either a U Value of 1.6 W/m2K or a window energy rating of C. For fire safety, all habitable rooms in buildings of one or two storeys need to have an escape window in the event of a fire.

Windows from Everglade Windows are manufactured to be strong and sturdy, Secured By Design certified and are available with A-C energy rating. Plus, our Everguard hinge protection system comes as standard on our uPVC windows. We will advise you on ensuring that the windows meet all building requirements.

Here at Everglade HQ, we manufacture a range of windows to fit almost any shape and size

An accurate window measurement combined with high quality, stunning windows from Everglade Windows makes for an installation that’s draught free, has clean lines and a flawless finish.

Our Perivale showroom has a wide range of windows in both uPVC and aluminium in casement, sash, tilt & turn, French casement, Georgian and heritage styles.

We’ve been supplying West London with quality window and door products for more than 35 years. You can chat to our expert team who can help you through the whole process from start to finish at our Greenford showroom, or by calling us on 020 8108 5282.