Casement Window Replacements
The UK's most popular window style — fitted across Devon, Cornwall, Dorset and Somerset.
The most versatile window style
Casement windows suit almost every property type — from 1930s semis to new-builds and barn conversions. We fit uPVC, aluminium and timber casements with A-rated double glazing across the South West, all with a 10-year guarantee.
Every casement install is surveyed in person and quoted in writing. We'll talk you through opener layouts (top, side, dummy), trickle vents, restrictors and child-safety options before ordering — no surprises on fit day.
Process
- Free on-site survey covering every opening, opener layout and material preference.
- Written, itemised quote — uPVC, aluminium and timber priced side by side where useful.
- Manufacture (typically 3–6 weeks depending on colour and material).
- Installation by our in-house team — most whole-house projects finish in 2–4 days.
- FENSA certificate, Building Regs sign-off and 10-year workmanship guarantee.
Frames tired but structurally sound?
If your existing casement frames are solid, our on-site spraying can refresh them in any RAL — typically 60–75% cheaper than replacement.
Related services
Frequently asked
What is a casement window?
A casement window is hinged on the side (or top) and opens outwards on a friction hinge. It's the most common window style in UK homes built from the 1930s onwards.
uPVC, aluminium or timber casements — which should I choose?
uPVC is the best value and lowest maintenance. Aluminium gives the slimmest sightlines and a modern look. Timber suits period or rural properties. We quote all three honestly so you can choose.
How much do replacement casement windows cost?
Across the South West, A-rated uPVC casements typically cost £550–£900 per opening fitted. Aluminium runs £900–£1,400. Timber £1,200–£2,000. Every quote we provide is itemised in writing.
Can I match the original casement sightlines?
Yes — we offer slim-sightline frames and bonded astragal bars to closely match older steel or timber casements without losing thermal performance.
Do casements work well on coastal properties?
Yes, with the right hardware. We fit marine-grade stainless friction stays and locking gear as standard within a mile of the coast — Cornish, North Devon and South Devon installs all get this spec automatically.
How long does a casement replacement take?
A typical 8–12 window whole-house replacement takes 2–4 days on site once the units arrive. Lead time from survey to installation is usually 4–8 weeks.
Ready to start your project?
Free quotes · 10-year guarantee · Friendly local service.