• Next day delivery
  • Installation service available
  • Buy back on all products
  • Rated Excellent

Construction Site Security Guide

Browse our full range of construction site security products (opens in new tab)


Construction is a vast and valuable industry which involves both the storage and on-going use of high value vehicles, materials, tools and machinery. All of these items have a resale value, whilst items such as fuel have an off-set cost value, making construction sites a highly profitable magnet for criminals.

As such, every year, the construction industry loses £400 million through theft, and approximately the same amount again through vandalism and fire, with around 40% (approximately 100,000) of all construction site fires being started deliberately (source: Aviva).

The industry also involves a significant workforce, many of whom can be rendered vulnerable by inefficient security measures on construction sites.


The threats

Criminal activity as a result of unauthorised entry into a construction site presents several overall threats:

  • To operations, including ongoing works and schedules, disruption to which costs millions each year.
  • To property and materials – including buildings and outbuildings, structures under construction or demolition, as well as construction materials, tools, equipment, plant, fuel and petty theft of workers’ possessions and assets.
  • To life, including trespassers causing damage which has the potential to injure, maim or kill, such as ripping out fixtures and leaving wiring unsafe, as well as deliberate actions such as arson which threaten life as well as property.

As an example, the relatively high cost of fuel means that fuel theft is popular: it can easily be reused and disappear without trace, whilst the single action of stealing fuel from a construction site can have repercussions which threaten operations, property and life:

  • Operational cost – few plant vehicles or generators can function without fuel. The delays caused by both the lack and the need to refuel affects schedules, which can affect overall progress towards deadlines.
  • Property cost – expensive plant may be damaged in the process of the theft.
  • Life – fuel spilled during theft is common and presents a fire hazard which could be both life-changing and life-ending.


Loss and liability

As well as the threats to operations, property and life, the actions of thieves who’ve gained access through inadequately secured sites threatens site owners or managers with liability for further loss and damage. For example, if plant and heavy, powerful vehicles are stolen in order to gain access or destroy other buildings, such as ram-raiding retail premises, or to gain high up access to a building, this consequential action of the theft can be costly in terms of both site loss and liability for other damage / losses occurring off-site.

Similarly, construction companies can find themselves liable for accidents involving trespassers or as a consequence of trespassers compromising overall safety. This is often the case when sites are inadequately secured against trespass and vandalism. Construction sites can be particularly vulnerable to vandalism as part of general anti-social behaviour or specific, renegade rebellion against construction being carried out in the locality.


Construction site challenges

Construction site pedestrian barrier

Construction sites offer particular security challenges:

  • Busy sites mean constant movement. With workers being focused on their own areas and tasks, the site may be vulnerable to opportunists who may just walk in unchallenged to help themselves, or enter the site to check out the layout, value of assets and presence (or not) of onsite security, in order to return later for a more organised theft spree.
  • A variety of access points are often needed, for vehicles, construction site workers and for authorised visitors, such as managers and building control. Access points and arrangements may constantly change as work progresses and may be particularly vulnerable as phases of work move on.
  • Movement and storage of vehicles which may need to be kept onsite temporarily can be a challenge to secure in a cost-effective and safe manner.


Security essentials

Every construction site is different, both in location, environmental factors and needs, but in order to achieve security, there are common factors for fundamental security:

  • Thorough risk analysis is essential for the site and should reflect physical security, operational security and changes across each phase of work.
  • Protocols should be put into place to reduce risks identified in the risk analysis.
  • Limiting access, both to vehicles and visitors on foot, is essential in reducing opportunity for unauthorised access. Numbers should be limited and only authorised vehicles and persons present – no one, including site workers, should be able to access a site through an open entrance.
  • Vehicle vulnerability should be addressed with action which includes key protocols so that plant which is temporarily not in use is not left unattended with keys in the ignition. All keys should be signed in and out and vehicles not in use should be locked in a separate parking area or garaged on-site. All plant should be fitted with immobilisation devices and tracking.

Static CCTV camera on construction cabin

Physical security involves embedding robust security which supports the infrastructure of the site. This means installing measures such as:

  • CCTV, alarm systems and signage – including highly visible systems which offer remote monitoring and recording both as deterrent and quick alert to problems arising. Warning signage and out-of-hours security contact information are essentials.
  • Access control – as well as minimal access points, this includes installing suitable, industrial security gating so that gates cannot be simply unhinged after hours.
  • Lighting – as both a visible deterrent and aid to security, lighting can particularly protect access points and should be fitted to areas which are inaccessible and therefore cannot be disabled by intruders.
  • Fencing and barriers – RISC recommends construction sites install site perimeter security of at least 2.4 metres high. Additional security can be gained by deploying:
    • Barriers within the site to create separately secure areas.
    • Anti-climb, palisade and / or welded mesh fencing as these reduce access through climbing and makes intruders visible.
    • Kerbs and bollards if there is a risk of uninvited vehicle access across any part of the perimeter.
  • Locks – sites should include lockable storage such as steel tool vaults and containment so that all equipment, tools, metals and materials can be secured out of sight overnight and when not in use, to reduce visible temptation to opportunists. Fuel stores should also be adequately protected, to prevent both theft and possible use as part of an arson attack. All access points should be lockable after hours, using tamper-resistant methods, for example robust padlocking rather than shackles which could be cut.
  • Scaffolding – a resource often used by criminals to gain further access to property, all types of scaffolding, including scaffolding towers and ladders should be locked away when not in use.

Security manned-guarding

Operational security is the essential human overview and involvement in the security of the construction site. This may include designated personnel to oversee:

  • Provision and monitoring of risk management, assessment and health and safety protocols.
  • Manned guarding – with guards who are suitably qualified and hold a current Security Industry Authority (SIA) licence. 24 hour guarding is probably essential for larger sites whilst smaller sites may find mobile patrols or dog security more appropriate.
  • Entry and exit monitoring.
  • Locking away and security marking of plant, tools and equipment.
  • Key use protocols.
  • Managing and operating technology which supports security, such as setting alarms and automated systems (particularly important as the site develops and areas become additionally or differently vulnerable).

Finally, for any security put into place, it’s essential that site managers and workers share full involvement in the development of site security, are aware of systems and protocols and take responsibility for using these appropriately at all times.

This information is for general guidance only. For essential construction industry specific information, the UK’s Health and Safety Executive offers regularly updated information, including protocols and codes of practice.


Get in touch with SafeSite Facilities for free quotes and expert advice about construction site security.

Request a free no-obligation quote

We respond in under 30 mins on average (excl. weekends)

Or call now 0800 012 5352

Contact us

SafeSite Facilities Ltd
Unit 1, Martello Enterprise Centre,
Courtwick Lane
West Sussex
BN17 7PA

Call: 0800 012 5352

Registered Company: 6885921