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+44 (0) 1384 220 050

Steel is the ideal material for security doors: it’s strong, hard-wearing, weatherproof and affordable. It also comes in a wide range of thicknesses. The thickness of a sheet of steel is commonly known as the gauge. When choosing a steel security door for your home, office or industrial site, the gauge is an important factor to consider, but isn’t the be all or end all. The construction design and locking systems are equally important.


Consider which type of steel is being used by the manufacturer. If it’s thicker mild steel vs a slightly galvanised steel for the same price, you’re compromising steel thickness for longevity. It has become standard practise in Europe to use only galvanised steel, to resist the elements a door is open to (no pun intended!). If it isn’t galvanised, move on!

Misconception! Thicker Gauges = Higher Performance

A misconception in the industry is: the thicker the gauge, the better your security door will be. Actually, a heavier door is faster wearing and requires far more maintenance. Consider your application carefully and don’t allow the manufacturer to ‘over-spec’ the door to justify a higher price.

We use a combination of 2.0mm thick steel for our door frames and double skinned 1.0mm for our doors in our heavy and ultra duty ranges. We find that any thicker doesn’t achieve anything, unless it is required to be tested to a security standard higher than STS202 BR2 (which we have achieved with our ultra door). This is partly down to:

  • – Locking system – very strong multi point locking system
  • – 3* kitemark euro cylinder – to deter lock snapping, picking, bumping and plugging attacks
  • – Integral Design – ‘barbed’ jemmy bar lip to counter jemmy bar attacks
  • – Door core – Magnesium Oxychloride fire board is used for it’s fire resistant properties, but happens to be very strong too.

Key Questions to Help You Choose the Right Gauge

The particular gauge you need will depend on the purpose of your steel door. Before making your selection, it’s worth giving some careful thought to where, why and how often the door will be used.
You may find it helpful to ask yourself the following questions:

  • – What is the key application for the door?
  • – Does it need to have acoustic properties?
  • – Must the door thermally insulate to a certain U-value?
  • – How secure must it be, must it comply with a standard?
  • – Will the door be used internally or externally?


Actually, the answer to the majority of the questions above is within the door composition. For acoustic and thermal properties, the infill is more important than the steel gauge. The gauge does contribute towards the security of the door, but don’t let this lose your focus from the other main factors which contribute: Locking system, euro cylinder (main weakness!) door and frame profile/design, hinges and door core.

Standard Duty Steel Door Range

Our budget steel doors are light duty, and are manufactured using 1.2mm galvanised gauge steel for the frame and double-skinned 0.6mm galvanised gauge steel for the door leaf. This makes them hugely versatile and able to withstand impressive impact, whether used internally or externally.

The range includes personnel doors (flush and panelled options are available), as well as fire exit doors, all of which are ideal for low security areas in factories, offices, residential properties etc. Standard duty doors are great value all-rounders and well suited to numerous domestic, commercial and industrial settings.

Value for money cannot be questioned in this range, starting from just £139.99+VAT

Heavy Duty Steel Security Doors

When you require a thicker, higher performance gauge, our heavy-duty steel security doorsets will go the extra mile. Each is constructed using 2.0mm gauge steel for the doorframe and double-skinned 1.0mm gauge steel for the door leaf.

Like their standard duty counterparts, heavy-duty doorsets have many applications in domestic, commercial and industrial settings. They have all of the advantages of standard duty doorsets, as well as a number of important additional benefits.

Heavy-duty doorsets are ideal for locations where very high security is required. What’s more, they are excellent insulators (compared to doors with a honeycomb core), great barriers against noise and easily withstand particularly heavy use, all of which is highly advantageous in very busy buildings with a need for security.
Our heavy-duty doorsets include personnel doors (flush and panelled), fire exit doors and blank doors – we’re sure to have one suited to your needs.

Rather than having a steel door fabricated, if our personnel or fire exit doors don’t suit your needs, choose our LINK
blank security door which is constructed from our heavier duty materials, but without any ironmongery or locks. Therefore, you can add the locks needed to customise this door to suit your needs. Ask your steel fabricator to fabricate a galvanised steel door and frame, hung on hinges and powder coated to our standard for under £200! (it won’t happen!)

Made-to-Measure Steel Security Doorsets

When you want a bespoke product, our made-to-measure steel security doorsets are ideal. They include our more specialist fire rated doors, which feature 2.0mm gauge steel doorframes and 1.6mm gauge steel door leafs for protection and peace of mind. When maximum security is essential (for example, when the door will shield valuables or weapons), we recommend our certified security doors available tested and certified to STS202 and LPS1175 levels.

Steel Outperforms PVC and Wood

Whatever gauge you choose, you can rest assured that steel doors offer greater benefits than typical PVC or wooden doors for the money. So give yourself a pat on the back for choosing steel and enjoy the many benefits of our product range.

For more advice about choosing the best steel security doorset for your specific needs, speak to our expert team today by calling 01384 220 050 or contact us online.