Introduction

When installing new double glazed windows or doors, taking accurate measurements is a crucial first step. If the measurements are off, you may end up with windows or doors that do not fit properly. This can lead to gaps, drafts, and even damage to window frames. Following some simple tips when measuring Double Glazing Sizes can help ensure your new double glazing units fit perfectly. Taking precise measurements for Double Glazing Sizes allows for custom manufacturing to exact window opening dimensions. Carefully measuring Double Glazing Sizes prevents issues with ill-fitting units down the road. So taking the time upfront to accurately measure your window openings for proper Double Glazing Sizes makes the whole installation process go smoothy.

Related: What is The Best Double Glazing?

Why Proper Measurement is Important

There are a few key reasons why accurate double glazing measurements matter:

  • Ensures proper fit and sealing to prevent drafts and moisture damage. Ill-fitting units allow cold air and water to leak in.
  • Avoids potential damage to window frames from forcing improperly sized units into the openings.
  • Saves time and money by getting the right custom sized double glazing the first time around. Reordering incorrectly sized units is inconvenient and costly.

Equipment Needed

Gathering the right measuring equipment ahead of time makes getting precise double glazing measurements much simpler:

  • Cloth measuring tape
  • Steel ruler
  • Pencil and paper
  • Level tool
  • Flashlight (for interior corners or low light areas)

Preparing to Measure

Clearing the Area

Before starting measurements, make sure the window openings are clear of any obstructions. Remove curtains, blinds, screens, plants, or anything else blocking access all the way around each window area.

Materials Checklist

Have your checklist ready to record all measurements for each window opening that will be fitted with new double glazing. Write down identifiers for each window (e.g. “master bedroom”, “kitchen”, etc.) before starting.

Measuring Window Openings

Height

Measure vertically from the highest point of the window opening to the lowest. For height, take measurements at 3 points – left, centre, and right – and record all 3 to account for any variance across the width.

Width

Measure horizontally across the widest points side to side. As with height, take width measurements on 3 vertical points – top, centre and bottom.

Depth

Interior window depth is important for knowing clearance for the window unit frame and hardware inside the opening. Measure the depth top to bottom in multiple spots.

Measuring for Glass or Frames

Double glazing units require getting sizes for both the actual glass panes and the overall window frames.

Glass

For the glass, take width and height measurements from where the glass sits within the frame, excluding any non-transparent border areas.

Cutting Allowances

Add 1/8 to 1/4 inch to the glass height and width numbers to account for cutting allowances used during installation.

Related: Best Glass for Double Glazing

Frames

Overall Size

Measure front, back, sides, and corners fully for the exterior frame dimensions. This gives the total unit size for fitting in openings.

Reveal Size

“Reveal” refers to the interior frame dimensions. Carefully measure all visible frame widths and heights inside to ensure proper interior reveal sizes.

Measuring for Trickier Window Shapes

Some specialty window designs need extra attention when measuring double glazing:

Arched Windows

Use flexible tapes and carefully measure arch heights at the centre point and outer edges. Get radius dimensions for accurately curved glass or frames.

Bay Windows

For angled bay windows, measure each section separately. Note the precise angle between walls. Also measure sill height from the floor.

Calculating Total Square Metres

To order glass panes or frames, providing total square metres for the entire job is helpful. Measure the height and width of every double glazing unit in millimetres, multiply to get square millimetres, then divide by 1,000,000 to calculate total square metres.

Double Checking Measurements

Before finalising any window measurements, check all numbers twice to verify accuracy. Just a small measurement mistake can make pre-ordered double glazing impossible to properly install, so diligent double checking is a must.

Hiring a Professional

For older homes with non-standard sized windows or uniquely shaped openings, consider hiring an experienced glazer to measure and install custom double glazing units. Though pricier, professionals can flawlessly handle atypical window fitting situations.

Conclusion

Getting accurate opening sizes is essential for double glazing to seal, function, and appear correctly. With some simple preparation like clearing space, utilising the proper measurement tools, methodically recording each dimension, double checking numbers, and hiring pros when needed, you can obtain perfect measurements to size stunning new double glazed windows and doors.

FAQs

Should I measure in metric or imperial units?

Metric is preferred, as it provides greater accuracy. Supply total square metres to glass/frame suppliers.

What if my windows are different heights or widths?

No problem. Custom-sized double glazing units can be made to fit each unique window. Just provide the individual measurements.

How are double hung or sliding windows measured?

Fully open both sashes and measure the total opening size for double hung. For sliders, measure one stationary section then measure the open slider section separately.

Should I account for out-of-square window openings?

Yes. Carefully quantify any left-to-right or up-down variance in sizes and provide these details to frame manufacturers.

What if I’m not sure about some measurements?

If any measurement seems questionable or clearance is very tight, err on the larger end of the size range to ensure proper double glazing unit fit.