WINDOW SIZES EXPLAINED
Associate editor Natasha Brinsmead provides a quick guide on window measurements
There is actually no such thing as standard window sizes in the UK. However, many window manufacturers do tend to offer ranges of ready-tofit products for most styles in the most commonly specified sizes. If these common sizes don’t fit in with your requirements or your existing window openings, you will need to have your windows custom-made to fit.
STANDARD SASH WINDOW SIZES Classic sash windows are a beautiful feature and are commonly found on Georgian, Victorian and some Edwardian houses. A common width for sash windows during the Victorian period was 4ft. These days, sash windows are most commonly available ready-to-fit in standard sizes of between 14 - 68 inches wide and 24 - 128 inches high.
STANDARD CASEMENT WINDOW SIZES
Casement windows are now one of the most popular window styles in the UK and are certainly the style most often specified by those opting for aluminium windows. Although there is no industry standard size, some of the most common sizes for ready-made casement windows include: 25in x 35in; 29in x 47in and 29in x 59in.
TILT AND TURN WINDOW SIZES
In terms of tilt and turn window sizes (which can be opened in one of two ways), single units typically come in a minimum size of 23.6in (600mm) x 19.7in (500mm) up to a maximum of 74.8in (1900mm) x 51.2in (1300mm).
Double tilt and turn windows come in a minimum size of 23.6in (600mm) x 47.2in (1200mm), up to a maximum size of 66.9in (1700mm) x 94.5in (2400mm).
SIZING UP WINDOWS TO FIT
“Be clear with bricklayers and frame suppliers about your windows’ sizes so they can accurately price and build the walls,” says Bob Branscombe. “It’s important to give them the actual sizes of the windows, not what are referred to as the ‘builders openings’, which are slightly larger measurements used to create apertures for windows to be fitted into — be sure to make this clear on the schedule of works when you come to compile it. Bricklayers can then make up timber formers to build window openings around as they go, which will avoid covering the new windows themselves in mortar and trowel scratches.”