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Composite Doors


Composite (GRP) doors are rapidly growing in popularity. As an Endurance approved installer, our colourful Composite doors have the appearance of wood but are made from tough glass-reinforced polyester, combining the best of traditional and contemporary design. They're energy-efficient, effortless to maintain and offer state-of- the-art security, with a Yale kitemarked 3-star cylinder lock fitted as standard. These stunning composite doors come in a huge range of colours, so you can be sure to pick a hue that will complement your home and your chosen colour scheme. Colour match your doors with any other improvements - garage doors, weatherboard cladding and windows to create something beautiful!

As well as looking great, Thermaspec GRP composite doors are incredibly strong and boast multi-point locking systems and reinforcement to ensure your property remains secure. The composite or glass reinforced plastic material also offers a maintenance free finish. Bridging the gap between traditional wood doors and modern uPVC doors, our range of composite doors offers entrance doors that are the focal point of your home and create the perfect first impression.

With over 50 different composite door designs to choose from, available in a wide selection of colours with an array of different door furniture and glazing options, your Thermaspec Composite Door can be as individual as you are.

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Endurance Doors Preferred Installer


Affordable, Stylish & Secure

Thermaspec UK Affordable, Stylish & Secure Composite Doors

Thermaspec UKAffordable, Stylish & Secure Composite Doors

Thermaspec UK Affordable, Stylish & Secure Composite Doors

Thermaspec are proud to offer a range of glass and hardware options:

  • Style – Thermaspec offer Composite doors that are aesthetically pleasing and suitable for both modern and traditional homes.
  • Security – Keep your home and family safe. Our Composite doors are made from impact resistant GRP – proven to PAS 24 Security Standard, boasting the ‘Secured by Design’ endorsement.
  • Weather Resistance – Our Composite doors keep the weather out and the warmth in. Proven to BS6375-1 Classification, for weather tightness, air, wind and water.
  • Heat Insulation – Save money, exclude drafts and keep your home feeling warm and cosy.
  • Sound Insulation – Keeping traffic and other noise sources at bay can be a challenge. Our composite door is designed to do just that.
  • Durability – Composite doors are designed to last the test of time. Backed by a 10 year manufacturer's guarantee and a Thermaspec 10-year guarantee you can upgrade your home with complete peace of mind.

Customise your doors and make a truly unique first impression on your street.


Door Styles

Variety of glazing options with a range of glass patterns and frosting. You can also choose which panels are glazed for more or less light with selected door styles. Create unique composite door that provides a stunning entrance to your home. 

Thermaspec UK Composite Doors Styles

Thermaspec UK Composite Doors Styles


Door Colours

Colour Express is a unique range of foil colours in 18 colourways for our full suite of windows and doors, helping homeowners choose the perfect colour palette for their home. Complete with colour matching ancillaries, trims and accessories windows and doors have never looked so pretty. Supplied from stock, everything - windows, residential and composite doors, the Slider24 patio door and Slide & Swing – door - arrives together to minimise inconvenience and disruption.

Colour Express Colour Options

Colour Express Colour Options

Colour Express Colour Options

Our wide range of foil finishes will compliment any home. Nine woodgrain finishes available from stock - foil on both inside and out or as foil on white. Available in all 3 window profiles: Traditional 2500, Heritage 2800 and Contemporary 3000.

  • Beautiful authentic 'wood like' finish
  • Extremely durable
  • 10 year manufacturer's guarantee
  • Window trims in all 9 colour foils

Colours available on 5 week lead time

Colour Express Colour Options with 5 week lead time

Colour Express Colour Options with 5 week lead time

Colour Express Colour Options with 5 week lead time


Energy Efficient Composite Doors

Composite doors help keep the warmth in, and cold and noise out, because of their high performing, CFC-free, PV foam insulated core. Our range of composite doors can thermally outperform solid timber core composite doors and traditional timber panelled doors.

All Thermaspec Composite doors are made to measure and are all available with a high-performance aluminium low threshold (part M).

Our doors are made to reduce energy loss by as much as 85% compared to traditional timber doors. The CFC free polyurethane foam used in the inner core and the timber free construction make it more environmentally friendly.

Composite Doors Spesifications

Composite Doors Secure by Design

Secure Design

Our composite doors make your home more secure as they have an impact resistant outer skin with rigid polymer sub frame, high density polyurethane foam core, secure hinges and a high security multi-point lock.


Solid Timber Core

Endurance Composite Doors from Thermaspec are made up of 17 engineered timber laminates. Kerto is a laminated veneered lumber (LVL) and it’s what makes our composite doors the most secure on the market today.

Solid Timber Core

Security Guarantee

£1000 SECURITY GUARANTEE

The ATK euro profile cylinder lock featured on your new door meets the requirements of the British Kitemark, TS007 3* and Sold Secure Diamond testing criteria and holds Secured by Design accreditation - the Police Crime Preventions Initiative.

The ATK lock has been specifically designed to combat against all known methods of attack on a euro cylinder. ATK has built in “Active Cam” technology with an advanced internal locking system that will prevent access into the inner workings of the door bolt if it has been snapped on the outside.

The ATK lock will remain secure after forced entry snapping attacks and in most cases, will still be operable with the key from the inside.

Given that we offer this unprecedented level of security on ATK locks we have the confidence to state that in the unfortunate event that a burglar could gain access to your property by snapping the ATK cylinder then Avocet will pay £1000 in compensation to the homeowner.


10% Thicker

Thermaspec’s wide range of residential composite doors are renowned for their strength and security, our 48mm thick cross-bonded veneered laminated composite door delivers unrivalled strength and dimensional stability and is a natural choice for high security, providing our home owners peace of mind. This incredibly thick solid core has been tested and fully certified by the British Board of Agrément (BBA).

Customise your doors and make a truly unique first impression on your street.

Thermaspec UK Residential doors

For more information about our Doors contact us today


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