Itchen Glass & Glazing
Casement Windows
The most popular window style in the UK, casement windows offer a versatile, reliable fit for almost any property type.
- Excellent ventilation
- Multi-point locking
- Made to measure & fitted by our own team
Casement windows in Southampton & Hampshire
Casement windows are hinged at the side and open outward, giving a clean, uninterrupted view. They’re the most widely fitted window style in the UK, and suit almost any property type, from period terraces to modern extensions.
Every window is made to measure for your property, not cut down from a standard size, using Liniar’s 70mm uPVC system — built for UK weather and fitted by our own installation team, with no subcontractors.
What you get with Itchen
Four things every casement window we fit is built around, whatever the property.
Excellent ventilation
Opens fully outward for maximum airflow when you need it.
Energy efficient
Multi-chambered profiles reduce heat loss and cut draughts.
Secure by design
Multi-point locking standard on every window we fit.
Made to measure
Every window measured and fitted by our own team, not a standard size.
Liniar systems
Liniar Approved Installer
Itchen is a Liniar Approved installer. Their profiles are designed, manufactured and tested at their own UK facility, which holds ISO 9001 certification.
- 01 UK-designed and manufactured to ISO 9001 standards
- 02 Multi-chambered profile design reduces heat transfer
- 03 Covered by manufacturer guarantees and warranties
- 04 Wide colour and finish range
Casement window specification
- Profile
- 70mm-deep multi-chambered uPVC, standard 4-chamber or Liniar EnergyPlus 6-chamber
- Thermal performance
- U-value from 0.81 W/m²K; energy rating up to A++
- Glazing
- 28mm double-glazed standard; 36mm/40mm triple glazing available
- Sound reduction
- Up to 33 decibels of noise reduction with 28mm double glazing
- Weatherproofing
- Liniar’s patented bubble gasket seal for a fully draught-free fit
- Security
- High-security multi-point locking; PAS24 and Secured by Design options
- Manufacturing
- Extruded in Derbyshire; fully recyclable
- Guarantee
- 10-year frame guarantee
Source: liniar.co.uk
Configurations we offer
Casement window colours and finishes
Colours and lead times vary — see the full range at liniar.co.uk/colours. Swatches shown here are an indicative guide, not exact finishes.
Casement window FAQs
What are the maintenance requirements?
A simple wipe with a mild detergent keeps the frames in good condition, and a light oil applied to the opening mechanisms once a year keeps them running smoothly.
What makes Liniar’s bubble gasket better?
Liniar’s patented co-extruded bubble gasket delivers a continuous seal around the whole frame, where traditional seals can fail at the corners.
Chamfered vs. sculptured frames — what’s the difference?
Sculptured offers a traditional, curved profile appearance; chamfered is a contemporary, bevelled finish. Both use the same 70mm system underneath.
Should I choose double or triple glazing?
Triple glazing offers a higher energy rating, but 28mm double glazing is already efficient for most homes. Our recommendation depends on window size and setup — we’ll advise at survey.
Interested in casement windows?
Request your free, no-obligation quote today.