Itchen Glass & Glazing
French Windows
A pair of side-hung sashes that open fully with no central post, in uPVC or aluminium, for an unbroken view and a wide opening onto a garden or balcony.
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French Windows in Southampton & Hampshire
Built on the Liniar uPVC system, the same 70mm profile as our casement and flush sash windows, with the option to upgrade to Liniar’s EnergyPlus 6-chamber profile for higher thermal performance.
Liniar uPVC System
- Profile
- 70mm depth, standard 4-chamber or Liniar EnergyPlus 6-chamber
- Glazing
- 28mm double-glazed standard; triple glazing available
- Seal
- Liniar co-extruded bubble gasket
- Security
- Multi-point locking, PAS24 / Secured by Design accreditation
- Guarantee
- 10-year frame and profile guarantee
Figures for Liniar’s uPVC window system as published at liniar.co.uk.
Built on Sheerline’s Prestige Windows system, with slimmer sightlines than uPVC for a more contemporary look, and genuine Thermlock® thermal-break performance.
Sheerline Prestige Windows
- U-value
- 1.4 W/m²K double glazed, 1.0 W/m²K triple glazed
- Profile
- 72–80mm width
- Energy rating
- A+ rated
- Guarantee
- 25 years against warping, cracking or thermal-break separation
Figures for Sheerline’s Prestige Windows system as published at sheerline.com.
What You Get With Itchen
Either material, one team
Made to measure and fitted by our own installers, whichever you choose.
British-manufactured systems
Liniar uPVC and Sheerline aluminium, both manufactured in the UK.
Free survey
We’ll measure up and talk through which system suits your property.
Domestic & commercial
Homes and businesses, Monday to Saturday.
French Window FAQs
uPVC or aluminium — which should I choose?
uPVC (Liniar) is the more cost-effective option with excellent thermal performance. Aluminium (Sheerline) gives slimmer sightlines for a more contemporary look, for a bit more. We’ll talk through both on survey.
What makes a window a “French window”?
A pair of side-hung sashes that open fully with no central post between them, unlike a standard casement pair.
Do I need planning permission?
Most standard residential replacements fall under permitted development rights. Conservation areas and listed buildings can be exceptions.
How do I get a quote for French windows in Southampton?
Call 0238 044 7075, email itchenwindows@gmail.com, or use the form below.