How to choose a security guard company for your business

A low hourly rate and a smart uniform are not enough to choose a security guard company. The decision requires evidence of lawful deployment, reliable staffing, effective supervision and a clear response when something goes wrong.

Compare providers against the same written brief, then examine the people and procedures behind each quotation. Due diligence before signing matters more than reassurance after a missed shift.

Start with the site’s risks and operating requirements. Those should determine the service, the staffing model and the standards written into the contract.

Key takeaways

• Define the duties, coverage hours and response requirements before requesting comparable quotations.
• Check individual licences separately from the company’s Approved Contractor Scheme status and other certifications.
• Assess regular officers and relief personnel against the same screening, training and site-induction requirements.
• Compare service quality, local supervision, staffing continuity and incident reporting alongside the total contract price.
• Require clear arrangements for missed shifts, urgent escalation, subcontracting and out-of-hours management.
• Complete contractual, insurance and operational checks before signing, with responsibilities assigned to the provider and the site manager.

Define the security problem before buying cover

Identify the risks and operating constraints

Walk the site with the facilities manager or responsible operational lead. Review access points, delivery routes, valuable stock, isolated work areas and periods when the premises are unoccupied.

Record previous incidents and near misses. Separate unauthorised entry, theft, violence, vandalism and alarm activations, because each may require a different response.

Consider what officers must keep functioning during an incident. A warehouse gate cannot be abandoned without affecting collections, vehicle movements and access control elsewhere.

Existing equipment also matters. Cameras, alarms and electronic access systems need assigned monitoring and response duties. Equipment without an agreed response can leave the same operational gap as an unstaffed post.

Turn the assessment into a written brief

Give each bidder the same site information, operating hours and required duties. Include staffing levels, post locations, patrol expectations, reporting arrangements and the proposed start date.

Explain which duties take priority when demands conflict. Reception cover, deliveries and perimeter patrols cannot all occupy the same officer at the same time.

Identify responsibilities that remain with the business. Security officers may report damaged fencing, but the facilities team normally controls the repair budget and contractor access.

For changing sites, describe the review points. New tenants, extended opening hours, construction phases and increased stock values can change the required cover.

A usable brief should allow bidders to explain their staffing assumptions. A quotation that merely repeats the requested hours provides little evidence that the site has been understood.

Match security services to the work required

Choose which security guard services the site needs before comparing suppliers. Continuous on-site attendance, occasional inspections and alarm response address different gaps.

The main service options have distinct functions.

Select manned guarding for business premises where continuous attendance is justified by access demands, asset exposure or the consequences of delayed intervention. Mobile visits may suit premises where risks can be managed between inspections.

Key holding is a separate responsibility from receiving an alarm signal. A complete arrangement identifies who receives the notification, who attends, how access is controlled and who authorises further action.

The procedure for commercial keyholding and alarm response should cover inspection, escalation, authorised entry and securing the premises. Sending an employee instead creates its own lone-working and safety considerations.

Close protection requires a different operational brief and role-specific licensing. A provider’s general guarding experience does not establish competence for protecting an individual.

Require bidders to explain why their proposed service matches the risk. More officer hours may improve coverage, but hours alone do not resolve unclear duties or defective physical protection.

Check SIA licences for every assigned officer

Separate individual licensing from company claims

The Security Industry Authority licenses individuals carrying out defined private security activities. Relevant sectors include security guarding, door supervision and public space surveillance, commonly described as CCTV operation.

Licensing involves identity and criminal-record checks, with recognised role-specific qualifications required for relevant front-line licences. The SIA licence application requirements describe these individual eligibility checks.

A licence establishes a regulatory baseline. It doesn’t establish familiarity with the building, experience in the client’s sector or competence with the site’s equipment.

Match the licence to the actual activity. A security guarding licence doesn’t authorise door supervision at licensed premises, whilst a door supervisor licence can cover security guarding work.

CCTV licensing depends on the activities performed, rather than the presence of a monitor alone. Procurement should distinguish camera observation, public space surveillance and other assigned duties.

Record licence checks before deployment

Use the official licence-checking service for each officer assigned to licensable work. Match the register entry to the person’s identity, licence sector and current status.

Record the licence number, date checked and outcome. Apply the process to supervisors, temporary replacements and last-minute relief officers.

Require the contractor to maintain a licence register and notify the client of relevant suspensions, revocations or renewal problems. A badge photograph retained at contract commencement isn’t ongoing monitoring.

Licensing, training and regulatory requirements vary by location and activity. Procurement should verify current requirements with the authority and relevant local authorities, particularly for events and licensed premises.

The provider should explain its deployment controls, including who prevents an unsuitable or unlicensed replacement from being sent. An urgent staffing gap doesn’t remove licensing obligations.

Understand ACS approval and other accreditations

ACS assesses the contractor, not the individual officer

The SIA Approved Contractor Scheme, or ACS, is a voluntary quality assurance scheme for businesses supplying regulated private security services.

Approval can cover activities including security guarding, door supervision and key holding. The company’s entry in the Register of Approved Contractors identifies its approved activities.

Match the legal contracting entity and the relevant activity to that entry. Approval held by another group business does not automatically cover the company named in the contract.

ACS provides additional assurance about management and operational capability. It does not replace individual licensing requirements or prove that a particular site will receive consistent supervision.

The ACS application guidance describes company checks and assessment requirements. ACS is not a compulsory business licence, and a firm can operate legally without approval where applicable licensing requirements are met.

Read certifications for their scope

ISO 9001 concerns quality management. ISO 9001:2015 certification addresses the management system used to control work, review performance and correct failures.

A certified system should have practical consequences, including controlled assignment instructions, recorded complaints and documented corrective action. The ISO 9001 quality management framework concerns organisational processes, rather than a guarantee that every shift will meet expectations.

ISO 14001 covers environmental management. The National Security Inspectorate describes its role in improving environmental performance, including waste reduction and management of environmental risks.

SafeContractor is a health and safety accreditation that some security firms hold. It addresses a different area from individual licensing or guarding performance.

Read the certificate’s scope, named organisation and validity information. A collection of logos provides less useful evidence than a clear explanation of how the relevant controls operate on the proposed contract.

Examine vetting, training and sector experience

Screening should extend beyond a licence

Reputable providers use recruitment interviews, identity checks, employment-history screening, references and appropriate criminal-record checks.

For eligible roles in England and Wales, confirm that personnel are DBS checked at a level appropriate to the role. Enhanced checks are restricted to eligible roles.

Disclosure arrangements differ across the UK, with Disclosure Scotland and AccessNI serving their respective jurisdictions.

BS 7858:2019 is a recognised screening standard for individuals working in a security environment. It covers identity, employment history and other relevant background information.

A DBS result alone doesn’t establish that broader employment screening has been completed. Require a clear statement of the screening standard applied, and confirm that assigned and relief personnel are vetted to the same documented standard.

Test competence against the site

Sector experience should connect to duties, rather than a list of industries on a website. Retail officers need different judgement and procedures from officers controlling a distribution yard.

For construction site security, induction should address site boundaries, contractor access, emergency routes and changing work areas. Officers should understand where movement requires permission or protective equipment.

Corporate reception duties require clear visitor verification and escalation procedures. Healthcare, education and other sensitive settings can add safeguarding or access requirements.

Request evidence of relevant training, refresher arrangements and site induction. Separate licence-linked training from the additional preparation needed to perform the actual assignment.

A qualified officer still needs a usable briefing.

Test staffing continuity and working conditions

Establish how regular and relief cover will work

A security guard company should explain how it will staff the full contract, including annual leave, sickness, training and unexpected absence.

Identify the regular security guards, relief arrangements and supervisory structure. A promise to find somebody when needed provides little assurance about availability or site familiarity.

Continuity matters where officers must recognise authorised staff, understand delivery patterns or spot changes in normal behaviour. Frequent rotation can weaken those controls.

Set an induction requirement for replacements. Relief officers need current instructions, access permissions and emergency contacts before taking responsibility for the post.

Require a handover process that records unresolved incidents, defective equipment, temporary access changes and outstanding instructions. Familiarity should support written controls, not replace them.

Assess whether the staffing plan is workable

Review shift lengths, breaks, travel demands and the allocation of duties. A single officer cannot remain continuously at reception whilst also patrolling a separate building.

The contractor should explain how breaks are covered where the post must remain staffed. The quotation should show whether relief is included.

Staff welfare affects delivery. Officers need suitable shelter, welfare facilities and a safe arrangement for lone working, particularly on remote or overnight assignments.

Ask how supervisors identify fatigue, repeated overtime and recurring vacancies. Persistent dependence on emergency cover can indicate that the contract is understaffed or difficult to retain.

Pay, supervision and predictable scheduling can influence retention. Treat continuity as an operational requirement with measurable evidence, rather than a promise of a permanent team.

Assess control-room support and patrol evidence

A 24/7 control room needs defined responsibilities

A 24/7 control room can schedule shifts, monitor officer control calls, receive incident notifications and arrange replacement cover.

Its value depends on what happens when an expected contact is missed. Require a written sequence covering attempted contact, supervisor notification, welfare escalation and any necessary attendance.

Separate the control-room operator from the account manager. The operator may coordinate an urgent response, whilst the account manager remains responsible for recurring staffing or service failures.

Identify who has authority to dispatch support and approve additional resources. An emergency number that only forwards messages leaves important decisions unresolved.

Test the escalation arrangements before service commencement. The site manager should know which number to use and what information to provide.

Patrol technology records activity, not the whole inspection

Guard patrol monitoring systems can use NFC tags positioned around the premises. Scanning a checkpoint can record the officer’s presence at a particular location and time.

Examine how missed checkpoints, interrupted routes and device failures are handled. The report should distinguish a completed patrol from an incomplete one.

A checkpoint record supports evidence of attendance. It does not establish that a door was secure or that a defect received follow-up.

Patrol instructions should describe the inspection required at each location. Exceptions need recorded observations, a responsible recipient and an action deadline.

Compare local coverage and response arrangements

A nationwide service claim does not establish the staffing available near a particular property. Assess the deployment base, supervisory coverage and relief resources serving the contract.

For a London security company, coverage may be described through boroughs and postcode areas, including the City of London, Westminster and EC or E postcodes. Those descriptions identify geography, not operational capacity.

Separate four measures: availability to accept work, time to mobilise planned cover, time to replace an absent officer and time to attend an alarm.

Each needs its own definition. An alarm response time measured from dispatch excludes any delay before a responder is assigned.

Require clear treatment of traffic, access restrictions, simultaneous incidents and circumstances outside the contractor’s control. Response commitments should state the measurement point and exclusions.

For dispersed estates, establish whether services are delivered by directly employed teams or local subcontractors. Identify who supervises each location and who retains contractual responsibility.

Empty buildings can require different inspection priorities from occupied premises. Plans for vacant commercial properties should address signs of entry, damage and other agreed conditions, rather than repeating an occupied-office patrol route.

Local knowledge is useful when it produces a workable attendance plan. A long list of service areas is not that plan.

Compare large firms with regional and specialist providers

Large providers may suit businesses needing coordinated delivery across many sites, central reporting or international support. They may also have broader specialist resources and established procurement systems.

Those advantages depend on the team allocated to the contract. A large workforce elsewhere does not resolve weak supervision at one property.

Smaller or regional firms may provide more direct access to decision-makers and closer attention to modest contracts. Their suitability depends on relief capacity, management cover and financial stability.

Specialist firms may understand a particular environment well, but sector familiarity should not excuse weak reporting or incomplete compliance evidence.

Use the same evaluation criteria for every bidder. Record strengths and weaknesses against service quality, responsiveness, staffing continuity, supervision, reporting and cost.

Set essential requirements before scoring preferences. A low price should not compensate for a licensing failure or an unworkable staffing plan.

The best fit is the provider whose resources match the assignment. Company size is relevant only where it changes the delivery available to the business.

Consider named UK providers by service requirement

A useful shortlist compares delivery models rather than unsupported claims to be the best. Established names provide a starting point, but their suitability depends on the proposed contract team.

These providers illustrate different service combinations.

This is a categorised comparison, not a ranking of service quality. No universal top-five list can account for local staffing, a site’s duties or the supervision included in a quotation.

Apply the same brief to national, regional and specialist bidders. Compare the named delivery structure and contractual commitments, rather than assuming that a familiar brand will allocate more attention.

For a single property, access to a capable local supervisor may carry more weight than international reach. For a multi-site business, consistent reporting and central account ownership may be more important.

A manageable shortlist should be small enough for a proper review of evidence. Adding more quotations has limited value if each describes a different service.

Compare prices using the full cost of delivery

Distinguish officer pay from the charge rate

An officer’s wage is not the price of a managed security service. The contractor’s charge also funds employment costs, leave cover, recruitment, training, supervision, insurance, equipment and administration.

The Security Jobs Board’s 2026 security salary guide reports security guard pay of £12.71 to £15.50 per hour, depending on the site, employer and region. That is a reported employment range, not a universal pay scale or client charge rate.

Higher-risk duties, specialist requirements, location and working patterns can affect costs. A low quotation needs enough detail to show how the required service will be funded.

Require a breakdown of included hours, supervision, equipment, management and relief. Compare quotations on the same VAT basis.

There is no reliable single hourly price for every UK assignment. A continuous gatehouse post and occasional event cover have different staffing and mobilisation costs.

Account for minimum shifts and additional charges

Some providers set minimum shifts of four hours within the M25 and six hours outside it. These are commercial terms used by particular firms, not a UK-wide rule.

A short attendance requirement can therefore attract a larger minimum charge. Compare the payable hours, not only the requested hours.

Review bank holiday rates, overtime, cancellation charges, emergency mobilisation, additional equipment and annual price adjustments. Establish whether supervision and holiday cover are included.

For key holding, separate the standing fee from call-out charges and any minimum attendance period. Repeated activations can materially change the annual total.

Compare expected contract expenditure using the same operating calendar and service assumptions. A lower headline rate may cost more once minimum bookings and excluded duties are added.

Price transparency means being able to explain the bill before it arrives.

Decide between direct employment and outsourcing

Direct employment gives the business control over recruitment, pay, scheduling and daily management. It also places responsibility for those arrangements inside the organisation.

The employer must manage holiday, sickness, training, employment rights, payroll and replacement cover. A small in-house team can struggle when several absences overlap.

An outsourced provider normally employs its officers and manages their employment obligations, with relief cover supplied under the service agreement. The contract should identify what cover is included.

Outsourcing does not remove the client’s duties relating to its premises, safety information or coordination with other employers. Responsibility needs to be divided clearly.

Licensing requirements also depend on the work and employment arrangement. Certain in-house roles are treated differently from contracted guarding, so avoid applying a single assumption to every position.

Changing arrangements may engage TUPE, the Transfer of Undertakings (Protection of Employment) Regulations. This can arise when services are outsourced, brought in-house or transferred between contractors.

The Acas guidance on TUPE transfers explains the protection of employees when a qualifying transfer occurs. Obtain employment advice early where existing personnel may transfer.

Compare the management burden as well as the staffing cost. Outsourcing has value when the provider supplies dependable supervision and cover, rather than simply processing wages.

Set performance measures and incident-reporting standards

Measure the service against the site’s objectives

Attendance and completed shifts are basic measures. Add indicators that reflect the purpose of the contract, including access-control compliance, patrol exceptions, escalation times and completion of corrective actions.

For retail clients, stock-loss reduction can help measure value. Assess it alongside trading patterns, stock-control changes and the reporting of theft or violence.

A reduction in recorded incidents can mean improved security, but it can also mean weaker reporting. Examine report quality and staff feedback before drawing conclusions.

Use a recorded baseline and a consistent review period. Avoid judging an officer solely on arrests, confrontations or other measures that may encourage unnecessary intervention.

Assign responsibility for actions that sit outside the guarding contract. Repeated reports of a broken lock will not improve protection until somebody authorises the repair.

Define what an incident report must establish

A useful report records when and where an incident occurred, what was observed, what action followed and who was notified.

Separate direct observations from assumptions and accounts supplied by others. Preserve the sequence of events and identify any outstanding action.

Set deadlines for urgent notification and the subsequent written report. Serious incidents need immediate escalation, rather than inclusion in a routine monthly summary.

Agree who can access visitor records, photographs, CCTV material and other personal information. The ICO’s video surveillance guidance explains the requirements for lawful, fair and transparent surveillance.

Reporting should support decisions and follow-up. A large volume of repetitive entries can conceal unresolved problems.

Complete due diligence before signing the contract

Examine the evidence behind the proposal

Identify the legal entity that will sign the contract, invoice the business and employ or supply the officers. Review company records, operating arrangements and financial information proportionate to the contract.

Obtain relevant insurance documentation and examine the insured activities, limits and exclusions. Public liability, employers’ liability and any additional cover need to match the service being purchased.

Review references from comparable contracts. Ask about missed shifts, management response, officer continuity and the handling of complaints.

Online reviews can identify recurring concerns, but they rarely explain the full assignment. A high rating does not establish that a provider can staff a remote night shift or manage a complex reception.

Record each material finding and its owner. Unresolved issues should be settled before signature, rather than carried into mobilisation without a decision.

Write the operational commitments into the agreement

The contract should incorporate the site scope, staffing hours, assignment instructions, supervision arrangements and reporting standards. Include the process for changing those requirements.

Define service levels for absence cover, escalation, account management and incident notification. State how performance will be measured and what happens after repeated failures.

Control subcontracting through clear notification or approval terms. The contracted provider should remain accountable for delivery, including the conduct and competence of subcontracted personnel.

Review liability provisions, payment terms, renewal, notice periods, price increases and termination rights. Service credits may address a billing issue, but they do not replace operational recovery.

Include arrangements for returning keys, access credentials, records and equipment when the contract ends. Identify who remains responsible during the handover.

A commitment in a sales proposal may be difficult to enforce if the signed contract excludes it or describes a different service.

Keep the agreement and operational documents consistent. Conflicting instructions create uncertainty precisely when officers and managers need a clear decision.

Mobilise the contract before the first live shift

Signing the contract does not complete the preparation. The mobilisation plan should allocate tasks, deadlines and acceptance decisions to named people.

Complete officer introductions, licence records, site induction, access permissions and equipment testing before responsibility transfers. Provide current site plans and emergency contact information.

Walk the patrol route with the assigned team. Identify restricted areas, physical hazards, alarm panels, communication limitations and the locations requiring recorded inspections.

Test the control-room contact, escalation route and reporting process. Resolve missing keys, failed devices and unclear instructions before the first unattended period.

Agree an early review after commencement, followed by regular service meetings. Initial reviews should address whether duties fit the available staffing and whether reports are useful.

Keep a corrective-action record with an owner and completion date for each issue. Repeated failures require a management response, rather than repeated reminders to individual officers.

Review the brief when the site changes. New opening hours, altered access routes, additional buildings or increased stock exposure may require a revised service.

Continuing oversight is part of the buying decision. The contract should make that oversight possible without requiring the client to reconstruct events after every problem.

Frequently asked questions

How do I check whether a security company is SIA licensed?

Licensing generally applies to individuals undertaking defined security activities, rather than issuing a general operating licence to every guarding company. Check deployed officers through the individual licence register.

Company-level ACS approval is separate and voluntary. Its register identifies the approved business and the activities covered.

Which security company is best for a business?

The strongest choice is the provider that can demonstrate lawful deployment, suitable sector experience, dependable local staffing and effective supervision for the assignment.

Compare evidence against a common brief. Price, company size and reviews should inform the decision, but none establishes service quality alone.

Who is the biggest security guard company?

The answer depends on whether size means global revenue, UK security revenue, workforce or guarding hours. Allied Universal, which acquired G4S in 2021, is a major global security group.

For UK procurement, the staffing and management resources assigned to the contract matter more than a group’s worldwide headcount.

Who are the top five security companies in the UK?

There is no single authoritative top-five ranking for every requirement. Securitas UK, Mitie, G4S, Corps Security and OCS are established names that can be compared by service model.

Their inclusion does not rank their performance or establish suitability for a particular property.

What minimum shift should a business expect?

Minimum bookings vary by contractor. Some firms use four hours within the M25 and six hours outside it, whilst others apply different terms.

The written quotation should state the payable minimum, cancellation terms and whether travel or mobilisation creates additional charges.

Choose a provider whose delivery can be demonstrated

A suitable security guard company connects the site’s risks to licensed people, workable staffing, clear supervision and useful records. Each part needs evidence before the contract is signed.

Treat accountability as a requirement throughout the service. Define who acts, what gets recorded and how failures are corrected.

The hourly rate matters within that complete arrangement. A competitive quotation has value when the promised cover can be delivered consistently.