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No.1 Rated UK's top rated double glazing supplier

Strong, Secure & Thermal Efficient GRP Composite Doors

Composite doors are now the preferred choice of double glazed external doors for many homeowners, diyer's and tradesmen due to the huge advantages that composite doors have over the alternative wooden doors, steel doors, upvc doors and most other external doors available. Durability, strength, security, thermal efficiency, weather resistant, low-maintenance and life expectancy to name just a few of the great benefits of a grp composite door.

Design & Price Your GRP Composite Door

design and price your composite door online

Quality Bespoke Composite Doors

Our diy made to measure composite doors supply only are manufactured to a very high security standard with a certified thermal performance. Offering quality grp composite doors and timber solid core composite doors which will leave you with more time to enjoy your new exterior door rather than continually maintaining it.

The composite door features a GRP compression moulded door skin and a timber woodgrain effect with a Polyurethane thermally insulated core achieving an authentic timber door look, furthermore a unique and patented reglazable cassette system.

composite door in grey
GRP Composite Doors Browse our range of traditional, cottage and contemporary style composite doors. £100 off.
timber solid core doors
Timber Solid Core Doors Browse our range of premium timber solid core doors. £100 off.
composite fd30 fire doors
FD30 Composite Fire Doors Browse our range of 30 minute fire rated and smoke tested fd30 fire doors. £100 off.

Endless choice of door styles, colours and hardware

Available in over 900 billion combinations with an a array of composite doors online, from the classic traditional, Georgian and Victorian front door style to the ever increasingly popular modern and contemporary along with an extensive choice of secure door locks, hardware suites, standand colours and bespoke superior colours including black, blue, green, red, white, oak, darkwood, chartwell green, cream, grey, duck egg blue, poppy red and black brown. We can also offer door and frame colour matching to any RAL colour. A choice of colour is available both sides of the door and upvc frame on our fantastic range of composite door styles. Coloured foil finished frames designed to match most profile systems offer excellent matching options to any existing double glazing in your house and with an excellent choice of contemporary and modern door hardware, available in chrome, gold, black, graphite (brushed chrome), white and brushed stainless steel.

Contact us at sales@justdoorsuk.com or give us a call 01530 273365

For further information on our double glazing and lead times please contact out friendly sales and customer service team.

Enhanced Door Security

As standard, composite doors are supplied prehung in a reinforced upvc frame with a luxury door hardware suite, a PAS24 accredited high security multipoint locking system which is Secured by Design accredited and an anti snap cylinder offering the utmost protection and safety for you, your family and your home. A premium security upgrade is also available to further enhance security features.

How long will a grp composite door last?

Door Type Expected Life - Maintained Maintenance Cycle Expected Life - Maintenance
Softwood Door 25 Paint (5 Years) & Yearly Oil 12
Hardwood Door 35 Paint (5 Years) & Yearly Oil 12
Timber Composite Door 30 Paint (5 Years) & Yearly Oil 17
Steel Composite Door 30 Wipe Clean & Yearly Oil 18
UPVC Composite Door 25 Wipe Clean & Yearly Oil 23
GRP Composite Door 35 Wipe Clean & Yearly Oil 33
Aluminium Powder Coated Door 25 Wipe Clean & Yearly Oil 20
UPVC Panel Door 20 Wipe Clean & Yearly Oil 15

Unbeatable Value Composite Doors

DIY composite door prices are available to buy online from just £580 inc VAT supply only - we may offer the best price and cheap composite doors for sale but rest assured the door quality and customer service from Just Doors UK is second to none, please check out the customer reviews page. Buy your new door direct from the UK's trusted and leading composite door supplier.

We supply trade composite doors, front doors, back doors, timber solid core doors, diy composite doors, modern style composite doors to the general public and diyer's, construction companies, renovation companies, builders.

The majority of external front doors we offer can be delivered within 3-4 weeks, prehung in the frame and ready to fit. You will get a new composite door, fabricated to your specification and of the highest quality and at great trade price! Just call our sales team on 01530 273365 to order your new door today from the UK's trusted and leading door supplier!

We now offer over 900 billion combinations of composite doors online available to buy!

Thermal Performance and U Values

Our solid cottage style composite door set achieves a `U` Value of 1.0 and an energy rating of A, while our half glazed Composite door with the thermal argon upgrade option achieves a 'U' Value of 1.4 - great numbers for keeping the digits on your energy bills low. The warm edge spacer bar technology in many of the double glazed units are even more efficient. It gives the composite doors a better overall energy rating compared to other UK composite doors available. Lower energy bills and better for the environment. Our GRP composite doors give you a nice warm feeling - all year round.

Take a look at how well our composite doors perform compared to the rest of the market. (Information from HAPM (Housing Association Provident Mutual) and BRE (Building Research Establishment)).

Colour match door drips

The door drip is the strip that runs across the face of the composite door at the bottom, it deflects running water from the bottom of the door. Drips have been made to match the colour of your door so it doesn’t stand out, not a silver or gold bar found on alternative composite doors. *Colour coded door drips not available with bespoke RAL colours.


Composite doors are available in 13 standard external door colours; black, red, green, blue, white, oak, darkwood, chartwell green, cream, grey, duck egg blue, black brown and poppy red. As standard, the internal door is white grained. Some of the solid colours are pre-pigmented which means the colour is added during the manufacturing process. As the skins are applied, the colour goes on evenly. The oak and darkwood finish is a hand-applied stained finish to give depth to the woodgrain. All composite doors have a high gloss, UV resistant film to give them a final sheen.

PVC edge banded doors

We've looked at every detail of our GRP composite doors, and edge banding is no different. The edge of the composite door is finished using an ash grained PVC. Once the edge has been applied, it is then trimmed and the edges milled to a radius so there are no sharp corners.

GRP Skin

Every grp composite door boasts a Glass Reinforced Plastic (GRP) woodgrain skin as standard to give great definition and long life performance. That’s the same material used to make the hulls of boats!

High security locking system as standard

The composite doors are fitted as standard with a high security multipoint hook lock, which has top credentials. The multi point locking mechanism has been tested to PAS23 and PAS24. This lock can also accommodate Lever/Pad or Lever/Lever split spindle handle mechanisms when required. The cylinder has five pins and has four anti-pick pins for added security. Then we've added a cylinder protector as standard. The guard helps to stop forced entry if the handle is removed.

Side panels

Side panels use the same composite door frame for a perfect colour match. They are available glazed or with a matching composite side panel. Glazed panels are internally glazed and unless specified will automatically come with the same glass pattern as the main door, so if you ordered the Cottage Half Glazed Composite Door with Cotswold glass, the glass pattern in the side panel would also be Cotswold. Glazed panels can also be fitted with the unique transom section. All GRP composite front door and side panels are fastened to the composite door frame using heavy duty 20mm aluminium coupling sections and then clad in PVC.

Dedicated top box transom

Adding a top box is simple with our composite doors. Because the frame has a dedicated transom bar, it is made in one piece. This makes it extra strong and looks good. The glass pattern will match the glass pattern chosen for the main glass design. So if you've ordered Crystal Diamond on Stippolyte, the top box can also be in Stippolyte.

Fully suited door hardware

The composite door has fully suited hardware so whether you choose gold, chrome, black, graphite or white hardware to finish your door, you can be sure of a perfect match. Everything from knockers and numbers to handles and hinges are designed as a complete suite. Gold finishes often tarnish, but with the hardex gold finish the gold has been toughened to withstand even the harshest elements.

PAS23, PAS24 & Kitemark

Our composite doors are being tested to the highest levels. All ready to install composite doors will conform to PAS23 and PAS24 as standard. These external doors will also carry the annexe D accreditation that tests the continued operability of the door after a simulated aging process. The new TDS standard, with the gusting test, have also been included. Please note unglazed composite doors carry no certification.