Casement vs Sash Windows: Which Is Right for Your Home?

The two classic UK window styles are the casement (hinged at the side or top, opening outwards) and the sash (sliding vertically). Both can be made in uPVC, timber or aluminium — the right choice is mostly about your home’s character and how you want the window to work.

Casement windows

The UK’s most common style: simple, versatile, excellent at sealing out draughts, and typically the most cost-effective. They open wide for ventilation and cleaning and suit most modern and many traditional homes.

Sash windows

The signature look of Victorian, Edwardian and Georgian properties. Modern uPVC and timber sash windows keep the authentic sliding operation and slim glazing bars while adding the insulation and security the originals lacked — ideal for period and heritage homes and conservation areas.

How they compare

• Cost: casements are generally cheaper; sash windows carry a premium for the mechanism and detailing.
• Looks: sash for period authenticity; casement (including flush-sash) for clean lines.
• Ventilation & cleaning: casements open wider; modern sashes tilt in for cleaning.
• Security: both achieve modern multi-point locking when specified.

Not sure which suits your property? A good local installer will advise on what’s appropriate (and what’s permitted in a conservation area). Get free quotes and ask for both options.

Frequently asked questions

Are sash windows worth the extra cost?

For a period property where authenticity matters, usually yes — they protect character and value. For a modern home, casements are excellent value.

Can I put casements in a Victorian house?

You can, but sash or flush-sash styles usually look more in keeping; in a conservation area the style may be restricted.