Liniar conservatory roof review

Liniar is a Derbyshire PVC-U systems company best known for window and door profiles. Its conservatory range is a glazed roof system and the Elevate lantern roof, both sold as kits to fabricators and installers rather than direct to homeowners. If you are looking for a Liniar solid or tiled roof, there isn’t one: our research found only the glazed roof and the lantern.

That still makes Liniar relevant if you want to keep a glass roof, want a lantern on a flat-roof conversion, or have Liniar windows and want the roof in matching colours.

Who makes Liniar roofs?

Liniar’s operating companies are H L Plastics Limited (05625493, incorporated in November 2005) and Liniar Limited (03360857, incorporated in April 1997), both at Denby Hall Business Park in Derbyshire. Quanex Building Products Corporation, a US-listed company, holds more than 75% of H L Plastics Limited.

Liniar’s own history says HL Plastics was started in 1974 by Godfrey Harris and Stuart Leese in Riddings, the Liniar brand launched in 2006 and Quanex took ownership in 2015. The Zoom conservatory roof system followed in 2011 and the Elevate lantern roof in 2018. The Zoom roof came from Epwin Group via Martin Randall’s Capulet Club LLP, and HL Plastics bought the remaining 50% in October 2013. Liniar’s ModLok bi-fold door won a Queen’s Award for Enterprise: Innovation in 2017.

How the Liniar conservatory roof is built

Liniar describes the roof as an aluminium construction with EnergyPlus PVC-U top caps, supplied as a complete kit through fabricators. Its patented features are:

• Glazing Stop: a retainer that stops glass or polycarbonate panels slipping down the roof, a common fault on older roofs.
• Jaw Lock: a patented radius assembly for curved (Victorian) roofs.
• Memory foam seals: patented seals intended to keep water out.
• Deep box gutter where the roof meets a wall.

The 2019 brochure lists 24mm (4-16-4) toughened double glazed units with optional self-cleaning or solar control coatings (self-cleaning is not available with the Clear Low E unit). The roof also takes polycarbonate, and DIY kits built on the Liniar system use 25mm polycarbonate. Liniar says in search listings that it is the only roof system offered with glass as standard.

The brochure itself gives two useful warnings: self-cleaning glass is less effective at pitches under 10 degrees, and north facing or shaded conservatories may be better with a clear unit that lets in more light. Our guide to solar control glass explains how to choose.

The Elevate lantern roof

Elevate is a PVC-U roof lantern on an aluminium frame with twin-walled EnergyPlus top caps, in rectangular or square shapes up to 2400mm by 5400mm. It is used on flat roofs and orangery-style conversions, and comes in the same colours as Liniar windows, with up to 36 colour combinations.

Liniar roof specifications

Specification	Liniar conservatory roof	Elevate lantern
Structure	Aluminium with EnergyPlus PVC-U top caps	PVC-U on an aluminium frame
Glazing	24mm toughened double glazing, optional self-cleaning or solar control; polycarbonate also supported	Not stated on the lantern page
U-value	No numeric figure published (“A+ standards of thermal efficiency”, per search listing)	Not published
Colours	White, Cream, Rosewood, Chartwell Green, Irish Oak, Golden Oak, 7016 Grey, Black Brown; more to order	Same colours, up to 36 combinations
Size	Not stated	Up to 2400mm x 5400mm
Guarantee	10 years against cracking, warping or discolouration of profiles; 10 years against seal failure on all glass units	Covered by the Liniar profile guarantee (length not stated)

Liniar conservatory roof cost in 2026

Liniar publishes no installed price, and we found none from a third party. The only prices we found are for supply-only DIY lean-to kits built on the Liniar system (Master Plastics) at Fascias.com:

Kit (supply only, roof width not stated)	Price including VAT
Glass, 2.0m projection	£1,119.74
25mm polycarbonate, 3.5m projection	£1,658.88
25mm polycarbonate, 4.0m projection	£1,788.48

Those exclude fitting, removal of the old roof and any frame repairs. For a fitted roof, our researched range for a glass roof on a medium conservatory is £3,500 to £7,000 (typically about £5,200) and for polycarbonate £2,700 to £5,200. See our glass roof cost guide, and our guide to conservatory roof kits if you are thinking of fitting one yourself.

Who sells and fits Liniar roofs?

Liniar extrudes the profiles and supplies independent specialist manufacturers and resellers, who you can find through a postcode search on Liniar’s site. They make up the roof and either fit it or supply installers. That means the fitted price, the survey, the workmanship guarantee and any insurance-backed cover all come from the local firm, not Liniar.

Replacing a glazed roof with another glazed roof on a conservatory that stays exempt (ground level, not over 30 m², separated from the house and not on the house heating) normally falls outside building regulations.

Reported problems and reviews

We did not find a Trustpilot rating for Liniar, and our research found no pattern of complaints about its roof. Because it sells through fabricators, reviews of your installer tell you more than reviews of Liniar.

Two limitations are worth knowing. There is no published roof U-value, so you have to rely on the glass unit’s figure. And the brochure’s own caveats on self-cleaning glass at low pitches matter for lean-tos. Beyond that, the usual glass roof issues apply: sealed units can fail and must be replaced, and glass still loses far more heat than a solid roof.

Liniar vs Ultraframe and other roof types

	Liniar	Ultraframe Glass Roof
Structure	Aluminium, PVC-U top caps	Aluminium bars, PVC-U or aluminium claddings
Glass U-value	Not published	1.0 (4S) or 1.2 (Standard)
Anti-slip feature	Patented Glazing Stop	Glazing retention clips
Guarantee	10 years profiles and sealed units	10-year parts, 10 years glass
Solid roof from the same maker	No	Yes (LivinRoof, UltraRoof 380)

Ultraframe publishes more performance data; see our Ultraframe glass roof review. If you are deciding between glass and polycarbonate on a Liniar-type roof, read glass vs polycarbonate.

Verdict: who a Liniar roof suits

A Liniar roof suits you if you want a glazed roof or a lantern, have Liniar windows and want matching colours, or like the anti-slip Glazing Stop on a roof prone to slipping panels. It is not an option if you want a solid, insulated roof; for that, see tiled conservatory roofs.

When you get quotes, ask each installer which glass unit they are quoting, its U-value, light transmission and solar control figures, and what workmanship guarantee they give on top of Liniar’s product guarantees.