Steel doors built forsecurity, fire safety andeveryday abuse.

A steel door is built from a galvanised or mild steel outer skin wrapped around a core, and the core is where most of the meaningful difference lies. Fire-rated doors typically use a mineral-based or honeycomb core engineered to hold its integrity under heat for a specified period, while security doors may use a denser core or internal reinforcement plates around the lock and hinge zones to resist drilling and prising attacks. Insulated steel doors use a foam or mineral wool core to improve thermal performance for external openings on heated buildings.

Frame construction matters just as much as the leaf itself. A steel door hung in a timber or thin-gauge frame will never perform to its full potential, whether that is security or fire resistance, because the frame is usually the weakest point in an attack or the first place a fire-rated assembly fails. We specify matching steel frames, correctly fixed into the substrate, with intumescent seals fitted where fire performance is required, so the whole assembly performs as a certified unit rather than a door that happens to be steel.

For sites where security is the primary driver, we look at the full opening rather than just the door leaf. Multi-point locking, anti-tamper hinge pins, hinge bolts, and reinforced strike plates all contribute to resistance against forced entry, and the right combination depends on the level of risk at the site and any insurance requirements attached to the building. Some premises need doors rated to specific attack test standards, particularly where valuable stock, cash handling or sensitive equipment is on the other side.

We also consider how a security door is used day to day. A door that is propped open constantly for staff convenience defeats its own purpose, so we discuss access control options such as coded entry, fobs or automatic closers where appropriate, so the security specification survives contact with real working habits rather than existing on paper only.

Fire doors have a specific job: to hold back fire and smoke for a defined period so people can escape and fire services can respond. A genuine fire-rated steel door is tested as a complete assembly, meaning the leaf, frame, hinges, seals and any glazing must all be part of the certified specification. Substituting a single component, such as fitting the wrong hinges or removing intumescent strips during a repaint, can invalidate the whole certification without any visible change to the door.

We work to BM TRADA / FIRAS standards on fire door installation and repair, and we can supply full certification paperwork for building control, insurers or fire risk assessments. For sites managing multiple fire doors, we recommend planned inspection visits, because fire door regulations increasingly expect documented evidence of routine checks, not just an assumption that the doors are fine.

Steel doors turn up across almost every type of commercial and industrial building we work on. Warehouses use them for personnel access alongside roller shutters, protecting stock and staff areas. Plant rooms and service risers use fire-rated steel doors to maintain compartmentation. Retail units use steel doors for rear-of-house security. Residential blocks use fire-rated steel doors on flat entrances and communal escape routes, where regulation is particularly strict following recent changes in fire safety legislation.

Education and healthcare sites often need a combination of fire rating, vision panels for supervision, and robust ironmongery that withstands high footfall, while industrial units may prioritise raw durability and security over aesthetics. We size the specification to the actual environment rather than defaulting to the same door across every project.

Commercial and industrial steel doors are typically specified for higher usage cycles, heavier impact loads and stricter compliance obligations than residential doors. A warehouse personnel door might be opened hundreds of times a day and needs hardware rated for that duty cycle, whereas a residential fire door on a flat entrance is used far less frequently but still carries the same non-negotiable certification requirements around escape safety.

Commercial sites also tend to need documented evidence: certification, RAMS, maintenance records and sometimes insurer sign-off, all of which we can provide. Residential and smaller commercial jobs may simply need a reliable, secure door fitted correctly and explained clearly, without the same paperwork trail, and we adjust our approach to match what the site genuinely requires.