It's easy to measure windows → Here's how!

How to measure for windows

It's a great feeling to be involved as much as possible when building and/or renovating your home.

In fact, you can go a long way by measuring windows and doors yourself, because it makes it easier to choose the window type and door if you can do this yourself.

For example, do you need to have windows according to standard dimensions or should they be bespoke, made for your house? Either way, we can help as we manufacture all products bespoke to your specifications and deliver directly from the factory home to your home.

Measured already? Go to our installation guide >

Video guide to measuring for windows

The right tools for the task

Before you get started, have the following ready: paper and pencil, a tape measure and possibly a spirit level if it is an older house. 

How to measure for new doors and windows - step by step

  1. Grab your paper and pencil and measuring tool

  2. Always measure from the outside. Start with the width, then the height.

  3. Measure more than one place from brick to brick. The opening in the wall might be slightly skewed, which is why you should use the smallest measurement.

  4. Now you have the hole measurements. To find the frame dimensions, subtract 2.5 cm from the hole measurements. This leaves a gap of around 1.25 cm in each side for sealing and insulation.

  5. Use the frame dimensions/measurements to order your Klar windows.

What's the difference between hole measurements and frame measurements?

Hole measurements are the measurements from brick to brick. Conversely, the frame dimensions are the measurements of the particular door or window element. You should always start with the hole measurements because you need space for insulation. The difference between hole and frame dimensions are approximately 2.5 cm in each dimension.

More tips for measurements

Always measure from the outside!

Always measure from the outside and always start with the width first, then continue with the height! Regardless of whether it's windows or doors.

Measure more than one place!

Measure from brick to brick. Remember to measure several places as the opening may well be slightly skewed. If the results differ, use the smallest measurement.

Find the frame dimensions!

Subtract 2.5 cm from the hole dimensions and you will have the frame dimensions you need to order your items. It leaves a gap all the way around of approx. 1.25 cm for sealing.

When you are measuring your windows

When you measure windows, pay attention to the interior conditions. Whether you choose wood or alu-clad frames and double or triple glazing might have an effect on the internal finishing. Check out our window selection and read more about different types.

When you are measuring your doors

When you measure doors, pay special attention to the interior conditions and consider especially if the door should be with inward or outward opening. Check out our door selection and read more about the component specifications.

Fitting external cills

As standard a 18 mm timber cill packer will be selected in the window configurator so you can fit your aluminium cill pressing onto that. You can choose not to have the cill packer fitted. Learn more about cills for Scandinavian windows and which other options you have.

By following our measuring guide when ordering Klar windows and doors we: 

Guarantee that your new windows and doors will be manufactured to your bespoke specifications.

Provide professional technical advice and answer all your questions to match your needs with correct products.

Make sure that your renovation process will be in accordance with Building Regulation requirements.

If you feel you would like some guidance either on how to measure your windows and doors or choose and order your products through our online system you can contact us today.

It Is Easy to Order Windows & Doors Online

Measure your old windows and doors:

Read our guide on measuring


Find your new windows and doors


Receive your delivery and install it:

Read our guide on installing


Klar is a fusion between Danish and Estonian craftsmanship and carpenting expertise. We offer a wide range of windows and doors to affordable prices in Scandinavian design heavily inspired by the classical, minimalistic style you so often see in Estonian, Swedish, Danish and Norwegian homes. Our products are first and foremost created with durability in mind. We’ve partnered with Scandinavia’s leading manufacturers with regard to glass, locks and wood to ensure that you get the best possible windows and doors. 

We have a large selection of types of windows and doors for you to choose from. Although Scandinavian windows and doors follow a certain inspiration, the designs typically differ and as such, we have eight types of windows to choose from:

Our Windows:

  1. Top Guided Windows

  2. Fixed Windows

  3. Cottage Windows

  4. Casement Windows

  5. Georgian Windows

  6. Combination Windows

  7. Opening Floor to Ceiling Windows

  8. Fixed Floor to Ceiling Windows

Our Doors:

  1. Front Doors

  2. Patio Doors

  3. French Doors

  4. Doors with Sidelight

  5. Sidelight to Front Doors

All of our windows and doors are made-to-measure

You can customise your windows and doors exactly to your liking with your needed measurements. Choose between materials, colours, handles, glass types and glazing. When choosing your new windows and doors, the most important aspect is figuring out which type of glazing you’d ideally want. At Klar, our minimum is double glazed windows and the same is with our doors. That is simply because double glazing ensures a large amount of energy efficiency. If you’d like, you can opt for triple glazing, resulting in excellent insulation and an even bigger reduction in condensation on the glass. 

One important thing to know about the materials we use, specifically with regard to our timber, is that we only use slow-grown high-quality FSC pine wood without knots. That is simply to ensure maximum durability for our doors and windows.

We also offer our doors with either double glazed or triple glazed windows. Choose between wooden front doors or aluminium composite front doors. If you’re looking for patio doors, we offer these as either wooden patio doors or AluClad patio doors.

Insulating windows and doors

New windows and doors keep your home warm and gives you peace of mind by leaving external noise outside.

The Measuring Guide

It's a nice feeling even to be involved as much as possible when it comes to your home. In fact, you can go a long way by measuring and ordering your new windows and doors yourself. It is much easier than you think.

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