Aluminium Windows

  • All our aluminium products are of the highest quality meaning they are strong and secure. With them also being 25% more thermally efficient they are a cost effective addition to your property. Complete with multi-point locking and internal beading they are of the highest quality. Our aluminium windows are all backed by a 10-year product guarantee.

  • Our aluminium windows are available in a variety of colour options to include the standard pure white and anthracite grey. For any non-standard colours talk to our team and we can discuss your colour requirements.

  • Each double-glazed unit has a u-value of 1.3, whilst our triple-glazed units are 0.8. Building regulations currently stipulate a u-value of 1.6.

  • We also offer two external sash and outer frame designs: pencil round and square.

Casement Windows

Casement windows are available in a "flush sash" for ultimate clean, modern aesthetics.


Just like the aluminium bi-fold doors they are 25% more thermally efficient than the competition.

Tilt and Turn

This design offers style and practicality opening slightly inward in "tilt" mode.


Allows fresh air in securely, or opening fully inwards in "turn" mode to make cleaning and maintenance easier

Bi-Folding Doors

At Highseal we manufacture beautiful, strong and "Secured by Design" WarmCore Aluminium folding sliding doors. These are available in a range of sizes, from 1 to 7 sashes.

As standard they come with triple glazing providing the ultimate in thermal performance. The profile contains a hidden orange thermal core which makes our doors 25% more thermally efficient than the more traditional Aluminium systems.

Our doors stack neatly in place for maximum impact, with inward or outward opening, and can be supplied up to 6m wide.

This innovative design comes with a choice of sash options, handle finishes, a variety of colours, styles and configuration options.

All our Aluminium bi-fold doors come complete with a 10-year product guarantee, supported by the ERA Five Star security guarantee.

We are on hand to help you choose the perfect warm, secure and beautiful WarmCore bi-folding door for your home.

Technical Data


Stainless Steel to resist corrosion and tough extruded Aluminium hinges.

Quad-wheeled track rollers

These are precision engineered to perform perfectly every time.

High-strength Rollers

These have a 200KG load capacity but WarmCore still ensures a smooth operation.

10-year Guarantee

The 10-year guarantee covers materials, surface finish and operation.

Triple Weather-sealing

This is on all sash interlocks ensuring exceptional weather performance, keeping drafts and wind-driven rain outside.

Rubber Gaskets

Run-through rubber gaskets create continuous weather-seals helping WarmCore to comfortably exceed the requirements of BS6375-1: the classification for weather tightness on windows and doors.

  • Door width max: 600mm
  • Max door height: 2400mm
  • Sash width max: 1000mm
  • Load per sash max :100kg
  • Frame and sash sightline: 129mm
  • Low threshold and sash sightline: 109mm
  • Sightline sash to sash: 156mm

Our bi-fold doors are available with a range of threshold options. For example ultra low Part M compliant Aluminium thresholds which help to avoid trip hazards. Alternatively you could have a step down from your door opening with an outer frame, 120mm integrated sill, 150mm sill or low Aluminium threshold.

The WarmCore door combination ranges from a single or French door, from 2-door to 7-door bi-fold.

Conservatories Scunthorpe

Aluminium Patio Doors

Meet the Highseal next generation in Aluminium Patio Doors. These doors are sleek, stylish and offer a flawless operation. Using the the same innovative full-width thermal core technology like our bi-folding doors meaning a highly efficient product.

Super Smooth 10 Wheel Roller
A unique, high-quality wheel-set with each sash running on 10 self-levelling rollers giving you ultra-smooth reliable performance.

Innovative Bi-Directional Lock
Designed to our exact specifications, a bi-directional lock createing a tangible sense of security homeowners love.

Exceptional Thermal Performance
The Warmcore full-width thermal core in the sashes give a double glazed U-value of 1.4. In addition the triple glazed has a U-value of 1.0 giving a market-leading thermal performance with the desirability and consumer appeal of aluminium.

Thermal Performance Upgrade

Glass options are available for our aluminium products including standard low-e glass, celsius glass, triple glazed or laminated.


Triple-glazing provides 75% more thermal performance than standard double-glazed Aluminium bi-folds.


Choosing 44mm triple-glazing increases the whole door U-Value rating from 1.4 to 1.0, compared to the standard 28mm double-glazing.

Celsius Glass

This is a high performance and easy clean glass, available as an optional upgrade. It utilises a low-e and solar control coating with an Argon filled cavity to limit the amount of UV and heat that passes through the glazed unit, giving the ultimate in thermal control whatever the weather.


Easy clean technology has also been added to reduce maintenance requirements. The coating lasts the lifetime of the glass; dirt and grime simply wash off with normal rain rather than sticking to the glass. This also provides 58% Heat reflection and 73% UV protection.

For quotations and / or orders for our
Highseal brand of products please contact us.