GDO Pro 20mm Vertical Wide Rib Chester with Window (32 Colour Options) garage door Steel GDO

GDO Pro 20mm Vertical Wide Rib Chester with Windows

The GDO Pro 20mm Vertical Wide Rib Chester with Window is a high performance insulated side hinged garage door, designed as a strong step up from basic single skin pressed steel doors. Its 20mm thick double skinned steel leaves are bonded to a thermal core to improve insulation, help reduce draughts and noise, and provide a more stable, secure door leaf that feels solid in everyday use. Both panels are factory mounted into a robust box section steel sub frame, so the whole doorset arrives pre-assembled with hinges, handles and hardware already fitted, making on-site installation faster, cleaner and more accurate.

Every doorset is purpose made to measure at no extra cost, ensuring a neat fit in the opening and helping to maximise the insulation and weather protection benefits. The Chester design is supplied with a practical 1/3:2/3 leaf split, giving you a wide main access door for daily use and a secondary leaf that can be opened when you need the full width of the garage. You can choose left or right hand opening for the active leaf, and the doors can be configured to open outwards as standard or inwards on request, allowing you to match the operation to your driveway layout and how you use the interior space.

Security and day-to-day convenience are built into the specification. Concealed shoot bolts secure the inactive leaf at the top and bottom, while the main leaf is fitted with a lever handle, deadlock and adjustable keep as standard, with an optional 3 point security locking upgrade available on taller double doors for extra peace of mind. The insulated construction and included threshold strip work together with double seals around the door leaf and frame to help limit draughts, dust and debris, and to keep the internal climate more stable, which is ideal if you use the garage as a hobby room, home gym, workshop or simply want a more comfortable, usable space.

The integrated window section in the Chester design brings natural light into the garage, making it feel brighter and more inviting without the need to rely solely on artificial lighting in the daytime. This is especially beneficial if you are regularly in and out on foot, need good visibility for tasks and storage, or want the garage to feel more like an extension of your living space. The modern vertical wide rib styling creates a clean, contemporary look that suits a wide range of property types, from newer builds through to updated traditional homes.

Manufactured in the UK, the door is finished in a durable powdercoat surface with white supplied as standard at no additional cost, and a broad palette of other colours available so you can co-ordinate with windows, entrance doors and other exterior finishes. Special RAL colours can be specified on request where a more specific or bespoke shade is required. For an extra design lift, you can upgrade to stainless steel (SS304) long handles in two different lengths, supplied as a pair, or choose from various lever handle finishes to match the style of your home.

Supplied complete with threshold, pre-fitted hardware and an engineered steel frame, the GDO Pro 20mm Vertical Wide Rib Chester with Window offers a well balanced package of insulation, security, ease of use and attractive appearance. It is a particularly smart choice if your garage is attached to the house or used frequently on foot, giving you quick, convenient access while helping to keep the interior more comfortable and your belongings better protected throughout the year.

When you are ready to order, simply choose the “up to” size that covers your opening and then enter your exact structural measurements into the ordering fields. From there, you can configure your GDO Pro 20mm Vertical Wide Rib Chester with Window using the options provided, including door leaf handing, door panel split and glazing style, to create a doorset that works perfectly for the way you use your garage. If you have any special requirements, such as needing the doors to open inwards or non-standard sizes, or if you just want to check the latest pricing and specifications, please feel free to email or call our team.

Factory Fitted Sub Frame
To ensure the easiest possible installation, your GDO Pro 20 doorset is delivered fully assembled with the aluminium fixing sub frame factory fitted as standard. This all-in-one construction guarantees accurate panel alignment straight out of the factory and means you only need to fix the frame into the structural opening, rather than trying to hang and adjust individual door leaves on site.

3 Point Locking
For an added level of security, a three point locking system featuring twin hood locks is available as an optional upgrade. The extra locking points help to clamp the active leaf tightly into the frame, improving resistance against forced entry and providing greater peace of mind if the garage is attached to your home or used for storing valuable items.
Please note: Minimum height over frame required is 1600mm.

Hinges
All heavy duty hinges come colour matched to your chosen door finish and are fully adjustable in three directions, allowing for fine tuning and perfect alignment of the door leaves on site. This makes it straightforward to achieve a precise closing line, consistent gaps and reliable sealing performance, even if your garage opening is slightly out of true.

Seals
Double seals fitted to both the door leaf and the frame help to protect your garage interior against the weather, while effectively limiting dust and debris from entering the space. Combined with the insulated 20mm door leaf and included threshold, these seals contribute to a more comfortable, stable internal environment that is better suited to hobby use, storage or regular daily access.

Handle Options
Customise the look of your doorset by selecting from our premium handle finishes. Options are available in Bronze effect (dark brown appearance), Gold effect or Satin effect to perfectly complement your chosen door colour. You can also upgrade to stainless steel (SS304) long D handles for a more contemporary, feature-led appearance and improved grip when opening and closing the doors.

Door Panel Split and Handing
The Chester with Window design is supplied with a practical 1/3:2/3 door leaf split, giving you a wider primary leaf for everyday access and a smaller secondary leaf that can be opened when you need the full garage width. This makes it easy to pop in and out on foot by using the main leaf only, while still retaining full-width access for vehicles, garden machinery or larger items whenever required. You can choose whether the main active leaf is on the left or right hand side at no extra charge, allowing you to tailor the layout to your driveway, internal storage and the way you naturally approach the garage.

Window and Glazing Options
The integrated window section at the top of the door panels is designed to bring natural light into your garage, making the interior feel brighter, safer and more inviting. This is especially useful if you use the space as a workshop, gym or utility area where clear daylight makes a real difference. The glazing is set within neatly detailed frames to complement the vertical ribbed design, and can be specified with different glazing styles to suit the look of your property and the level of privacy you require. Obscure or patterned glass options help to maintain light levels while limiting visibility into the garage, which is ideal if you store tools, bikes or other valuables inside.

Matching Pedestrian Side Doors
If your garage features a separate side entrance, we offer matching pedestrian doors built to the exact same high quality, double skinned insulated specification as your main garage doors. Available in widths up to 1320mm and heights up to 2340mm, these side doors feature the same vertical rib design, handle options and robust deadlock arrangement, ensuring a perfectly consistent aesthetic and performance across your property.

Door Stays
Friction door stays are now fitted as standard at no extra charge, preventing the doors from blowing shut in the wind. This makes day-to-day use safer and more convenient, particularly on exposed driveways or when you need both hands free to move items in and out of the garage.

Colour Options
Personalise your garage door with a choice of 32 colour options. The paint finish features a highly durable powder coat ripple texture, providing an attractive appearance alongside excellent resilience against the British weather. Whether you prefer classic white, modern greys, deep blues or warmer tones, you can co-ordinate your door with your windows, front door and other external finishes for a smart, unified look.

Choose from the classic low gloss solid colours below:

STANDARD FOC COLOURS:
White RAL9016
Black RAL9005
Grey RAL7016

PREMIUM COLOURS:
Signal Grey RAL7004
Dusty Grey RAL7037
Traffic Grey RAL7042
Light Grey RAL7035
Window Grey RAL7040
Basalt Grey RAL7012
Pebble Grey RAL7032
Iron Grey RAL7011
Slate Grey RAL7015
Graphite Grey RAL7024
Agate Grey RAL7038
Black Grey RAL7021
Steel Blue RAL5011
Cobalt Blue RAL5013
Sky Blue RAL5015
Gentian Blue RAL5010
Signal Blue RAL5005
Light Blue RAL5012
Moss Green RAL6005
Fir Green RAL6009
Chartwell Green BS14 C 35
Ruby Red RAL3003
Traffic Red RAL3020
Chocolate Brown RAL8017
Clay Brown RAL8003
Mahogany Brown RAL8016
Light Ivory RAL1015
Cream RAL9001
Traffic Yellow RAL1023

GDO Pro 20 insulated side hinged doorset specification

The GDO Pro 20mm Vertical Wide Rib Chester with Window is a made to measure, double skinned insulated steel side hinged doorset designed for everyday use where strength, security, comfort and appearance are all important. The twin steel skins are bonded to a thermal core to create a 20mm thick insulated panel, helping to improve rigidity, reduce draughts and limit heat loss compared with basic single skin steel doors. This upgraded door build gives a more solid closing action and a neater internal finish, making it particularly well suited to integral garages, workshops and multi-use garage spaces.

Door construction, insulation and performance

The door leaves use 20mm thick insulated steel panels with a neat, flat internal face for a clean look inside the garage and easier cleaning. The insulated construction helps to maintain a more stable internal temperature and can contribute to improved comfort when you are working in the garage or using it as a gym, hobby room or general storage space. Compared with a single skin door, the Pro 20 build also helps to reduce noise transmission and provides a sturdier barrier against accidental knocks and attempted forced entry.

Sizes and made to measure manufacturing

Each GDO Pro 20 doorset is made to measure to suit your structural opening, within the published minimum and maximum manufacturing sizes for this model. The Chester with Window design is supplied with a practical 1/3 and 2/3 leaf split, giving you a wider main leaf for everyday access and a smaller secondary leaf that can be opened when full width is required. This asymmetric split makes it easier to pop in and out on foot while still retaining generous vehicle access when both leaves are opened.

Aluminium sub frame supplied and factory fitted

The GDO Pro 20 doorset is supplied pre-hung and factory fitted within its colour matched aluminium sub frame as standard, so the complete unit arrives ready for straightforward installation on site. This all-in-one construction helps ensure accurate alignment of the leaves and frame straight from the factory, reducing fitting time and minimising the need for on-site adjustments. The frame and threshold arrangement also supports effective sealing around the perimeter, assisting with weather protection and overall performance.

Security and locking

The doorset is designed to provide improved security for everyday garage use, with a robust main lock and secure retention of the inactive leaf using concealed shoot bolts at the top and bottom. For an added level of protection, an optional 3 point locking system with twin hood locks is available on suitable door sizes (minimum height over frame 1600mm), clamping the active leaf at multiple points into the frame. This enhanced locking arrangement is particularly beneficial where the garage is attached to your home or used to store valuable tools, bikes or equipment.

Hinges and alignment adjustment

Heavy duty, colour matched hinges are supplied as standard and are adjustable in three directions to help fine tune alignment of the door leaves on installation. This multi-directional adjustment makes it easier to achieve an even gap around the frame, a smooth, reliable closing action and consistent sealing performance, even if the structural opening is slightly out of true.

Weather sealing

Double seals are fitted to both the door leaf and the frame to help protect against the weather and limit dust and debris entering your garage. Working together with the insulated panel construction and included threshold strip, these seals support better overall weather protection and a more stable internal environment, which is especially useful for integral garages and spaces used regularly.

Handle and finish options

A range of handle finish options is available to complement your chosen door colour and overall exterior style, including Bronze effect (dark brown appearance), Gold effect and Satin effect. You can also specify stainless steel long handles as an upgrade where a more contemporary, design-led appearance and enhanced grip are desired.

Colours

The GDO Pro 20mm Vertical Wide Rib Chester with Window can be specified in 32 low gloss solid colours in a durable, stipple effect powder coated finish designed for long term appearance and low maintenance. White is offered as a standard colour at no extra cost, with a wide choice of premium colours and special RAL options available to match or contrast with windows, entrance doors and other external features.

Matching pedestrian side door

If you also need a separate access door, a matching insulated GDO Pro 20 personnel door in the same vertical rib styling is available, allowing you to maintain a consistent look and performance across the property. This personnel door shares the same double skinned insulated construction, colour options and hardware finishes, making it a natural partner to the main Chester with Window garage doorset.

Installation Guidance for GDO Pro 20 Doorsets

One of the biggest advantages of the GDO Pro 20 insulated side hinged garage door is that it is delivered fully pre-assembled. The insulated door leaves come factory hung within their heavy duty aluminium sub frame, eliminating the need for complex assembly on site. This "all in one" approach significantly reduces installation time and ensures factory accurate tolerances from the start.

While full, detailed manufacturer fitting instructions are provided with the door, the standard installation process follows these key steps:

1. Preparation and Checking

Before removing your old garage door, carefully measure your new GDO Pro 20 doorset and check it against your structural opening to ensure it will fit. Make sure the floor where the threshold will sit is solid and completely level; an uneven floor can cause the doors to catch or prevent the weather seals from working effectively.

2. Positioning the Doorset

Because the doors and frame are pre-assembled, they should be offered into the structural opening as one complete unit. Keep the door leaves closed and locked during this stage to keep the frame rigid. Use plastic packers or timber wedges between the aluminium frame and the brickwork to hold the doorset securely in place. Use a high quality spirit level to ensure the frame is perfectly plumb, square, and level.

3. Fixing the Frame

Once you are completely satisfied that the frame is perfectly upright and square, drill through the aluminium fixing sub frame and into the structural opening. Secure the frame using appropriate masonry frame fixings (not supplied). It is important not to over tighten the fixings, as this can bow the aluminium frame and pinch the door leaves.

4. Securing the Threshold

The doorset features a built in threshold that must be firmly fixed to the floor. Ensure a line of sealant is applied beneath the threshold before final fixing to prevent water from tracking underneath into the garage.

5. Testing and Final Adjustments

Once the frame is fully secured, unlock and open the door leaves to check their operation. They should swing smoothly without catching. If slight adjustments are needed due to the opening being slightly out of square, the GDO Pro 20 features heavy duty 3-way adjustable hinges. These allow you to finely tune the position of the door leaves in three directions for a perfect, even gap and smooth lock engagement.

6. Perimeter Sealing

Finally, once the door is operating perfectly, apply a high quality exterior silicone sealant around the entire perimeter gap between the aluminium frame and the brickwork to ensure the installation is completely weather tight.

Please note: We always recommend downloading and reading the full official installation manual prior to beginning work.

Installation instructions can be found here

GDO Pro 20 Warranty & Guarantee

The GDO Pro 20 side hinged garage door is manufactured in the UK to exacting engineering standards. To provide you with complete peace of mind, your doorset is backed by a comprehensive manufacturer's warranty. To ensure the validity of these guarantees, the door must be installed, operated, and maintained in accordance with the supplied manufacturer instructions.

10 Year Safe and Reliable Operation

The main structure of the GDO Pro 20 door is covered by a 10-year warranty ensuring safe and reliable operation. This provides long-term confidence in the core structural integrity and safety of your garage doorset.

2 Year Hardware and Component Guarantee

A 2 year warranty is provided on all moving and mechanical parts under normal daily use (defined by the manufacturer as up to 5 open/close operations per day). This comprehensive cover includes all primary hardware such as hinges, locking mechanisms, shoot bolts, and handles.

2 Year Factory Paint Finish

The factory-applied powder coat colour finishes are covered by a 2 year warranty against primary paint failure. Please note: As is standard with steel door manufacturing, the rolling and pressing process may cause slight natural distortion which can become apparent under certain lighting, and minor cosmetic blemishes are considered normal. The internal rear face of the door is not designed to have the exact same uniform cosmetic finish as the exterior.

Coastal and Estuary Exclusions

Please be aware that any steel doors fitted within 250 metres of the coastline (where the beach ends and the land begins) or directly adjacent to an inland estuary are strictly exempt from the paint finish warranty due to the highly corrosive saline environment.

Key Warranty Conditions and Exclusions

• Inspection upon Delivery: Goods must be carefully inspected upon arrival. Any transport damage or missing items must be reported within 48 hours of receipt. By proceeding to install the garage door, you acknowledge and accept its visual condition; no claims for cosmetic damage can be accepted once the item has been installed.
• General Maintenance: The door panel must be kept clean and free from impact damage. Any accidental areas of paint damage must be dressed with touch-up paint as soon as possible to prevent corrosion. Regular cleaning and light lubrication of the moving parts is required.
• Warranty Invalidation: Improper installation, structural modifications, repairs by non-qualified individuals, or damage caused by severe external influences (such as fire, flooding, alkaline solutions, bird droppings, or abnormal atmospheric pollution) will completely invalidate the warranty.

Always remember to allow for some fitting tolerance when ordering. In a perfect world we would recommend about 10mm all round, meaning you measure the width and height and then take 10mm off the smallest dimensions all round and this gives the Ordering Sizes. In real world apertures the floor is often not level and the aperture not totally square so please make sure you allow enough tolerance to cater for any out of square dimensions.