Window system
Liniar
Mainstream, marketed heavily on thermal design and British manufacture.
Overview
About Liniar
Liniar is a comparatively modern, UK-designed system. It is often presented to homeowners on the strength of its chambered thermal design and the fact it is made in Britain.
It is a genuinely capable system. As always, the specification quoted around it — glass, hardware, reinforcement approach — determines what you actually get.
Ownership: UK-designed PVC-U system, manufactured in Britain.
Systems / Ranges
Ranges within this system
Casement
The core replacement window range.
Flush sash
Timber-look flush external appearance.
Appearance
External and internal appearance
Casement and flush sash external appearances, both aiming at a clean, modern PVC-U look.
Window / door types
Products available in this system
- Casement windows
- Flush sash windows
- Door profiles through allied systems
Colour options
Colour and finish
White as standard, with foiled and painted colour ranges offered by most fabricators.
Glazing capability
What it can glaze
Designed for standard double- and triple-glazed sealed units; exact maximum thickness depends on the range and hardware quoted.
Thermal performance
Thermal performance
Liniar markets its profile around a chambered thermal design. We do not repeat a specific U-value figure here, because the finished window's performance depends heavily on the glass unit — ask your installer for the whole-window figure, glass included.
Security
Security
Multi-point locking is standard. Any specific security standard claim should be confirmed on the installer's own certification for the product supplied.
Best suited to
Typical applications
- Whole-house replacements
- Homeowners prioritising energy performance
- Projects wanting a British-made system
Things to consider
Strengths and things to consider
Strengths
- Modern chambered design developed relatively recently
- British manufacture, which shortens supply chains
- Flush and standard casement appearances both available
Things to consider
- Marketing around thermal design can overshadow the glass unit, which usually has more effect on the result
- Fewer decades of UK track record than the older German systems
Before you sign
Questions to ask an installer
- 01Is this the casement or the flush range?
- 02How is the frame reinforced?
- 03What U-value is being quoted for the finished window, glass included?
The Glazora view
A strong mainstream option. Ask for the whole-window figure rather than a frame-only claim, and compare it on the same basis as every other quotation.
See how Liniar compares directly against another system, or get a quotation based on your own property.
Source / last verified
Where this information comes from
Source: Manufacturer published system literature and trade/fabricator-facing brochures in general circulation.
Last verified: Structure reviewed February 2025 — figures below are qualitative pending direct manufacturer confirmation.
Still needs verification against manufacturer literature:
- Frame depth, chamber count and sightline figures
- Any specific U-value
- Any PAS 24 / Secured by Design claim not confirmed on the installer's own certification