French Doors
A classic pair of fully-opening doors for a patio, garden or balcony, in uPVC or aluminium.
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French Doors in Southampton & Hampshire
Built on the Liniar uPVC system, the same profile used across our window and door range, with multi-point locking and a 10-year guarantee as standard.
Liniar uPVC System
- Profile
- 70mm depth, standard 4-chamber or Liniar EnergyPlus 6-chamber
- Glazing
- 28mm double-glazed standard; triple glazing available
- Security
- Multi-point locking, PAS24 / Secured by Design accreditation
- Guarantee
- 10-year frame and profile guarantee
Figures for Liniar’s uPVC door system as published at liniar.co.uk.
Built on Sheerline’s Prestige Doors system — the same range Sheerline publish specifically for French and single doors — with Thermlock® thermal-break technology and PAS24 security as standard.
Sheerline Prestige Doors
- Thermal performance
- Thermlock® technology, U-values as low as 1.2 W/m²K
- Security
- High-security hinges, PAS24-compliant multipoint locking
- Opening styles
- ‘Stepped’ or ‘Contemporary’ sash, with optional InvisiHinge concealed hinge
- Threshold
- 3 thermally broken aluminium thresholds, tested to Part M
Figures for Sheerline’s Prestige Doors range 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 Door FAQs
uPVC or aluminium — which should I choose?
uPVC (Liniar) is the more cost-effective option with excellent thermal performance. Aluminium (Sheerline Prestige Doors) gives slimmer sightlines for a more contemporary look. We’ll talk through both on survey.
French doors or patio doors — what’s the difference?
French doors swing open like a pair of hinged doors; patio doors slide sideways on a track. French doors give a wider fully-open aperture; patio doors need less clearance space.
Are French doors secure?
Yes — both our uPVC and aluminium systems use multi-point, PAS24-compliant locking as standard.
How do I get a quote for French doors in Southampton?
Call 0238 044 7075, email itchenwindows@gmail.com, or use the form below.