How To Measure a Wooden Window for Replacement: Joinery Guide

Measuring wooden windows accurately is essential for a successful replacement. This step-by-step guide will help you measure your windows correctly, ensuring you get the perfect fit for your new window. Follow these steps to take the measurements of your timber windows and doors.

🛠️ Tools You Will Need

Before starting, gather these essential measuring tools:

✅ Measuring tape – Essential for accurate measurements
✅ Notepad – Record all measurements
✅ Pencil – Mark reference points

📏 Step-by-Step Measuring Guide

Follow these five essential steps for precise window measurements

Step 1: Measure the Width

Start by measuring the width of the window frame at the top, middle, and bottom. Note the smallest measurement as this will be your reference.

💡 Pro Tip: Always measure in millimeters for precision

Step 2: Measure the Height

Next, measure the height of the window frame from the top to the bottom. Again, take measurements from the left, middle, and right, and use the smallest height.

💡 Pro Tip: Take three measurements at different points

Check for Sash Windows

If you have sash windows, measure the width and height of each sash separately.

Deduct 10mm for Installation

For fitting purposes, deduct 10mm from both the width and height measurements to allow for installation.

⚠️ Important: This 10mm gap is crucial for proper fitting

Double-Check Everything

It’s important to double-check your measurements to ensure accuracy. This will help you avoid issues when installing your replacement windows.

💡 Expert Tips for Accurate Measurements

Check Frame Condition: When measuring, make sure to check the condition of your existing window frame and the brickwork. If there are any irregularities, note them down, as they may affect the fitting of your new window.

Get Professional Advice: If you’re unsure or need assistance, get in touch with your window manufacturer for advice on glazing options and specific measurements.

Following these steps will help you take accurate measurements, ensuring that your new wooden windows fit perfectly and enhance the beauty of your home.

❓ Frequently Asked Questions

Everything you need to know about measuring wooden windows

Why is it important to measure your windows accurately?

Getting your window measurements right is key for a perfect fit. This is even more important for timber windows and doors. By measuring correctly, you avoid ordering the wrong size, which can cause problems during installations.

How do I measure the width of my old wooden window frame?

Start by measuring the width at three spots: top, middle, and bottom. Use a tape measure and write down each measurement. If there’s difference, take the smallest number and subtract 10mm for a smooth fit.

Should I measure the height in a similar way?

Yes, measuring the height is the same process. Measure at several points up the window. Use the smallest measurement to get an accurate figure for replacement or upgrade.

Why do I need to account for sashes and sills?

Some windows, like sash or casement styles, need extra space. Adding this ensures your new window fits well and moves freely. This is vital for timber windows and doors, where hardware and parts can affect size.

How can I avoid common measuring mistakes?

Always double-check your measurements and check the brickwork. Also, note any external finishes that might change the size. These steps help keep your measurements accurate and prevent mistakes when sharing them with the manufacturer.

When should I consider glazing options during measuring process?

Choose your glazing options, like double glazing, when you measure. This lets the manufacturer include the glass thickness. Planning your glazing early helps meet your energy and style needs.