Updated: October 2024

When it comes to choosing blinds, getting the measurements right is crucial. Accurate measurements ensure that your blinds not only look great but also function properly, providing privacy, light control, and insulation. Incorrect measurements, on the other hand, can lead to poor fitting, leaving gaps or making the blinds too large for the window space.

In this guide, we’ll walk you through the process of measuring for blinds. Whether you’re installing blinds inside or outside the window frame, this step-by-step approach will help you get the perfect fit. Plus, we’ll explore different types of blinds and some helpful tips to avoid common mistakes.

Understanding Blind Types

Choosing the right type of blind for your window is the first step in the process. Each type has its own advantages in terms of style, functionality, and how they fit into different spaces.

Types of Blinds

• Roller Blinds: Simple and sleek, roller blinds are a popular choice for their ease of use and minimalistic design. They roll up into a neat cylinder, making them perfect for modern homes.
• Venetian Blinds: These blinds are made of horizontal slats that can be tilted to control light and privacy. Venetian blinds are highly versatile and available in materials like wood, aluminium, and faux wood.
• Vertical Blinds: Commonly used for larger windows or patio doors, vertical blinds feature vertical slats that can be tilted or drawn completely to the side.
• Commercial Blinds: Heavy-duty and durable, commercial blinds are often used in offices and business environments.
• Automated Blinds: With a remote control or smartphone app, automated blinds allow you to adjust light levels at the touch of a button, making them a high-tech, convenient option.
• Roman Blinds: Offering a softer look, Roman blinds are made of fabric that folds neatly as it is raised, adding elegance to any room.
• Conservatory Blinds: Specifically designed for conservatories, these blinds help regulate temperature and light in these typically glass-heavy spaces.

Common Blind Sizes

Knowing the common blind sizes can save you time when shopping. While custom blinds offer a tailored fit, there are many standard blind sizes available in the UK. When searching for the right size, a blind size chart can be helpful for comparison.

For example, standard blind sizes UK cm range from widths of 60cm to 240cm, with drops from 90cm to 240cm. Understanding these common sizes can make it easier to decide whether off-the-shelf blinds are suitable or if you’ll need custom measurements.

Tools You Will Need to Measure Blinds

Before you start measuring, gather the necessary tools to ensure your measurements are accurate. Here’s what you’ll need:

• Tape measure: A metal tape measure is ideal for precise measurements. Avoid fabric or plastic ones, as they may stretch over time, leading to inaccuracies.
• Pencil and paper: Jot down your measurements to avoid forgetting key details.
• Level: Use this to ensure your measurements and fittings are straight.
• Step stool or ladder: Handy for reaching higher windows.

How to Measure Inside Mount Blinds

If you prefer a clean, streamlined look, inside-mount blinds are a great option. These blinds sit within the window frame, giving a seamless appearance. Here’s how to measure them correctly:

Step-by-Step Guide

1. Measure the width:
   • Use the tape measure to determine the width at three different points: the top, middle, and bottom of the window recess. This helps identify any inconsistencies in the window’s size. Write down the smallest measurement, as this will ensure the blind fits snugly inside the frame.
2. Measure the height:
   • Measure from the top of the window recess to the sill at the left, centre, and right sides. Again, record the longest measurement to ensure full coverage.
3. Considerations for depth:
   • It’s important to check if your window recess has enough depth to accommodate the blind. The depth required will depend on the type of blind you choose, so consult the manufacturer’s recommendations.

How to Measure Outside Mount Blinds

For those looking for maximum coverage, outside mount blinds extend beyond the window frame, providing better light control and privacy. Here’s how to measure:

Step-by-Step Guide

1. Measure the width:
   • When measuring for outside mount blinds, start by deciding how far beyond the window frame you want the blinds to extend. Typically, adding 5 to 10 centimetres on each side ensures the blind fully covers the window.
2. Measure the height:
   • Measure from where you want the top of the blind to start (often above the window frame) to where you want it to end (e.g., the window sill or even lower, depending on your preferences).
3. Additional considerations:
   • Be mindful of any obstructions, such as handles, window cranks, or decorative elements, when measuring for outside mount blinds.

Steps to Install Window Blinds

Now that you have your blind measurements, it’s time to install them! Here’s a quick guide to help you through the process.

Preparation Before Installation

Gather all the tools you’ll need, including:

• A screwdriver
• Drill and drill bits
• Wall plugs (if required)
• Mounting brackets (usually included with the blinds)

Installation Process

1. Inside mount blinds:

   • Place the brackets inside the window frame and mark where the screws will go.
   • Drill pilot holes and screw the brackets into place.
   • Snap or secure the blinds into the brackets according to the manufacturer’s instructions.

2. Outside mount blinds:

   • Mark where the top of the blind will go on the wall, ensuring it’s centred over the window.
   • Attach the brackets to the wall using wall plugs if necessary.
   • Secure the blind in place as per the instructions.

Check that the blinds are level and operate smoothly. Adjust any cords or mechanisms as needed.

Tips to Consider When Measuring Blinds

Accurate measurements are key to ensuring your blinds fit perfectly and operate smoothly. A little attention to detail during the measuring process can save you from the frustration of ill-fitting blinds and ensure a flawless installation. Here are some simple but essential tips to keep in mind when measuring your windows for blinds.

1. Measure Twice, Cut Once: Always double-check your measurements to avoid costly mistakes. Measure at least twice to ensure accuracy, especially when using a metal tape measure for precision.
2. Measure in Millimetres: For the best accuracy, measure your windows in millimetres. Most suppliers in the UK work with metric measurements, so it’s easier to match your measurements to a blinds size chart.
3. Account for Obstructions: Consider handles, locks, or vents when measuring for blinds. These can interfere with the blind’s fit, so make sure to account for them, especially for inside-mount blinds.
4. Measure at Three Points: For inside mount blinds, measure the width at three points (top, middle, bottom) and use the smallest one. For height, measure left, centre, and right, using the longest measurement.
5. Consider Blind Style: Different blinds require different measurements. For example, roller blinds might need extra width, while Venetian blinds need a snug fit, so check specific instructions for your chosen style.

Invest in Bespoke Blinds at Blinds In Harmony

Accurate measurements are the key to ensuring your blinds fit perfectly and enhance the aesthetic of your space. With this guide, you’ll have the confidence to measure for blinds, whether you’re fitting them inside or outside the window frame. For bespoke, high-quality blinds, look no further than Blinds In Harmony. 

At Blinds In Harmony, we specialise in high-quality bespoke blinds that fit perfectly, regardless of window size or style. Whether you need blinds for your home or commercial space, we have a variety of solutions, from roller blinds to conservatory blinds. You can also explore automated blinds for ultimate convenience.

If you are not sure what style suits your home, then explore our gallery to see some of our stunning designs in action and get inspired for your next project.

Ready to take the next step? Contact us today for a free, no-obligation quote. Our experts are here to help you measure, choose, and install the perfect blinds for your home.