20mm Insulated Double Skin Side Hinged Doorsets

Greater performance, strength, and security for the price of many single skin hinged garage doors!

If you use your garage for an extra room, workshop, office, gym, or simply want to protect a prestige vehicle, you need more than a basic pressed steel door. The GDO 20mm Insulated Side Hinged Garage Door represents a massive upgrade in quality over tired up-and-over doors. Save on energy costs, vastly increase your home security, and enjoy far superior weather protection by upgrading to a double-skinned steel doorset.

Why Upgrade to Double-Skinned Steel?

Unlike traditional single-skin steel doors that offer poor insulation and rattle in the wind, our GDO doors are manufactured using twin galvanised steel skins bonded to a dense thermal core. This robust composite construction forms a solid 20mm deep insulated leaf that provides substantially more rigidity and stability. The thicker panels allow for heavier-duty hardware, meaning these doors lend themselves to much stronger multi-point locking systems and adjustable hinges, giving you the kind of reassuring, high-security clunk usually reserved for an expensive front door.

Engineered for maximum thermal performance, these doors boast a superb U-Value of 2.8W/m²k. By keeping the cold out and retaining internal warmth, they help regulate the temperature and humidity of your garage, saving you money on electric heating in workshops or utility rooms. Furthermore, both door panels sit perfectly inside a heavy-duty, factory-fitted box section steel sub-frame. Combined with double weather seals around the door leaf and a built-in threshold strip, they create an impeccable barrier against draughts, dust, and rain.

• Made to Measure as standard at no extra cost, ensuring a snug fit into your structural opening with no need for unsightly infills or packers.
• Pre-fitted handles, hinges, fittings and hardware on all doors. The factory-assembled steel sub-frame guarantees the easiest possible on-site installation.
• Concealed Shoot Bolts at the top and bottom of the inactive door leaf, holding the secondary door panel securely in place against attempted break-ins.
• Manufactured in the UK supporting high-grade local engineering and ensuring consistently high structural integrity.
• Durable Powdercoat Finish available in 27 different attractive colour options to perfectly match your home.
• High-Security Hinges are colour matched as standard and are fully adjustable in 3 directions for maximum flexibility in leaf alignment (2 hinges standard, 3 on larger leaves).
• Left or Right Hand Door Opening available to select at no extra charge. Doors are split 50/50 opening as standard and can be configured to open outwards or inwards.
• Exceptional Weathersealing with a built-in Threshold Strip included as standard. The design also features double perimeter seals to limit dust and debris from entering the garage.
• Lever handle, deadlock and adjustable keep all included as standard, featuring an internal thumb turn for effortless and safe operation from inside. (A 3-Point Security option is also available for doors over 1600mm high).
• 2 Year Product Guarantee covering the hinges and locking mechanisms for normal daily use.

The Perfect Timber Replica

This elegant windowed design is a perfect visual replica of the traditional timber side-hinged garage doors seen on so many period and character homes around the UK. It combines the classic, sought-after aesthetic of vertical boarding and top-light glazing with all the modern benefits of 20mm double-skinned steel. Enjoy natural light in your garage alongside unbeatable security, zero rot, no repainting, and vastly superior insulation.