How to Hire a Security Company in London

To hire a security company in London, businesses should verify SIA licensing, confirm public liability insurance of at least £5 million, request a written risk assessment, review verifiable client references, and obtain a detailed service-level agreement before signing any contract. The Surrey Security Co. is a licensed, professional security provider serving businesses across London and the South East.

Introduction: Why Getting This Right Matters

Hiring the wrong security company in London is one of the most costly mistakes a business can make — not just financially, but in terms of liability, reputation, and the safety of your people and assets.

London is home to thousands of security providers. Some are excellent. Many are not. The challenge for any business owner or facilities manager is knowing exactly what to look for, what questions to ask, and which red flags to walk away from.

This step-by-step guide is built for decision-stage buyers: people who are ready to hire, want to do it correctly, and cannot afford to get it wrong. Whether you are procuring security for a commercial office, a construction site, a retail environment, or a large-scale event, the process outlined here applies to you.

By the end of this guide, you will know:

The legal requirements every London security company must meet
How to assess quality beyond just price
What a good contract looks like and what to refuse to sign
How to avoid the most common procurement mistakes
What makes a security provider trustworthy and credible

If you want to skip straight to a professional conversation, our team at The Surrey Security is ready to help.

How to Hire a Security Company in London?

Step 1: Define Your Security Requirements Before You Speak to Anyone

The single most common mistake businesses make when hiring a security company is approaching the market without a clear brief. If you cannot articulate what you need, you will be sold what the provider wants to sell you.

What to establish before the first call

Type of security service required. Are you looking for manned guarding, mobile patrols, event security, key holding and alarm response, CCTV monitoring, or a combination? Each service has different SIA licence categories, staffing requirements, and cost structures. Being clear about what you need prevents scope creep and ensures you are comparing like-for-like when receiving proposals.

Site-specific risk profile. A retail environment in central London faces different threats than a logistics warehouse in the outer boroughs. Understanding your threat landscape — whether that is shoplifting, trespassing, after-hours break-ins, or public-facing aggression — shapes the profile of the officer you need and the protocols that should be in place.
Hours and coverage model. Full-time static guarding is more expensive than mobile patrol contracts. Know whether you need 24/7 presence, business-hours-only cover, overnight-only, or periodic response. Having this mapped out prevents providers from upselling unnecessary coverage.
Escalation and emergency requirements. Who do you need to be notified in an incident? Do you need the security team to liaise directly with the Metropolitan Police, manage key access, or operate under your company’s internal protocols? Define this now.
Putting this in writing — even as a one-page internal brief — will make every subsequent conversation with a provider far more productive. It also signals to quality providers that you are a serious, organised buyer.

Step 2: Verify SIA Licensing — Non-Negotiable

In the United Kingdom, any individual providing a licensable security activity must hold a valid licence issued by the Security Industry Authority (SIA). This is not optional. It is a legal requirement under the Private Security Industry Act 2001.

What the SIA licence confirms

An SIA licence confirms that an officer has passed an enhanced Disclosure and Barring Service (DBS) criminal record check, holds an accredited first aid qualification, and has completed role-specific training appropriate to their licence category. Licences must be renewed every three years, meaning you can verify that a candidate is current and compliant.

How to check SIA licence status

You can verify any security officer’s licence in real time through the SIA’s free public licence checker at sia.homeoffice.gov.uk. Any reputable provider will encourage you to do this and provide licence numbers proactively.

If a provider is evasive about licence numbers or discourages verification, treat this as an immediate disqualifier.

The Approved Contractor Scheme (ACS)

Beyond individual licensing, look for companies that hold SIA Approved Contractor status. The ACS is a voluntary quality accreditation for security companies — not just their individual officers. ACS-registered businesses are assessed across management, operations, and service delivery, and are subject to regular independent audits.

Approximately only 20% of UK security companies hold ACS status. Choosing an ACS provider significantly narrows the field to organisations that have made a provable commitment to operating standards.

Step 3: Confirm Insurance — And Check the Details

A licensed security company operating commercially in London should carry, at a minimum:

Public liability insurance of at least £5 million — ideally £10 million for higher-footfall environments
Employers’ liability insurance of at least £10 million (legally required in the UK where staff are employed)
Professional indemnity insurance relevant to the services being provided

Do not simply take a provider’s word on this. Ask for a Certificate of Insurance and verify the policy is current, the insurer is FCA-authorised, and the coverage limits are appropriate for your site’s risk profile.

A provider unwilling to share insurance documentation should not be trusted with the security of your business.

Step 4: Request a Formal Site Assessment and Written Risk Assessment

A professional security company will not quote you accurately — or responsibly — without visiting your site. If a provider sends you a price without conducting a survey, that is a red flag.

A quality site assessment should result in a written risk assessment that covers:

Identified security vulnerabilities (access points, blind spots, staffing gaps)
Recommended countermeasures and their prioritisation
Officer deployment recommendations (number, positioning, patrol routes)
Technology integration requirements, if applicable (CCTV, access control)
Incident response procedures specific to your site

This document becomes the operational foundation of your contract. It should be provided to you, not kept solely by the contractor. If an incident occurs, you need evidence that a professional assessment was conducted and that appropriate recommendations were made and implemented.

Businesses that skip this step often discover the most common security mistakes UK businesses make — chief among them: deploying generic security measures to sites that require tailored solutions.

Step 5: Assess Quality Through References and Track Record

Price is not a proxy for quality in the security industry. In fact, providers consistently undercutting the market on price are usually doing so by paying officers below-industry rates, reducing training investment, or overpromising capacity they do not have.

How to assess genuine quality

Ask for verifiable references from similar sectors. A company with strong references in retail but no experience in construction site security may not be the right fit for your project. Ask to speak directly with reference clients — not just receive a testimonial email.
Look for evidence-based outcomes. Ask prospective providers: “Can you give us examples of incidents you have prevented or resolved for clients with similar risks to ours?” The ability to narrate real, specific outcomes demonstrates operational competence that generic marketing language cannot.
Assess staff retention. High officer turnover is a reliable indicator of poor internal management, low pay, and weak organisational culture — all of which translate directly to inconsistent service delivery at your site. Ask providers what their annual officer retention rate is. Industry average hovers around 50-60%; companies retaining 80%+ of staff are demonstrably better managed.
Look at sub-contracting policies. Some security companies win contracts they do not have the internal capacity to staff, and fill the gap with sub-contracted officers from third parties. These officers may not have been vetted to the same standard. Ask explicitly: Will all staff deployed to our site be directly employed by you?

Step 6: Evaluate Technology and Reporting Capabilities

Modern professional security companies in London integrate technology alongside manned guarding. When assessing providers, consider whether they offer:

Digital patrol monitoring. Officers equipped with near-field communication (NFC) checkpoints or GPS tracking allow clients and managers to verify in real time that patrols are being conducted on schedule and route. This is not surveillance of officers for its own sake — it is accountability infrastructure that protects both parties.
Incident reporting systems. Every incident — however minor — should be documented in a time-stamped digital report, ideally accessible to you through a client portal on the same day. Paper-based reporting is an unacceptable standard in 2024 London.
CCTV integration and remote monitoring. For some sites, manned guarding can be supplemented or partially replaced by remote CCTV monitoring from an Alarm Receiving Centre (ARC). A quality provider should be able to advise honestly on whether this suits your requirements and cost model.
Key holding and alarm response. If your premises have an intruder alarm system, professional key holding means a licensed, insured security officer — rather than you or a member of staff — responds to alarm activations out of hours. This reduces personal risk and liability exposure significantly.

Step 7: Scrutinise the Contract Before Signing

The security services contract is where risk is allocated. Read it carefully, and where necessary, have your legal team review it. Key provisions to check include:

Minimum contract term and exit clauses

Many security companies require 12-month minimum contracts. This is not unreasonable, but you should understand what termination looks like. Is there a notice period? What are the penalties for early exit? Is there a performance clause that allows termination if defined service standards are not met?

Service Level Agreement (SLA) definitions

The contract should define measurable service standards: response times to incidents, maximum vacancy rate (the percentage of shifts that can be filled by non-permanent cover officers), reporting turnaround times, and escalation procedures. Vague language like “best efforts” is not sufficient.

Substitution and staffing continuity provisions

Insist on provisions that require the company to notify you when officers are substituted, ensure cover officers meet the same qualification standards, and maintain staffing continuity for long-term deployments. Frequent officer rotation is disruptive to site familiarity and client relationships.

Liability caps and indemnity provisions

Understand what the company’s liability is if their failure causes you a loss. Some contracts contain liability caps that are very low relative to the value of the assets being protected. This is negotiable.

Price escalation clauses

Many security contracts include annual CPI or National Living Wage increase clauses. These are reasonable and transparent. What you should push back on is open-ended escalation language that gives the provider discretion to increase pricing without a ceiling.

Step 8: Understand Pricing and What Drives It

Security in London is not a commodity. Pricing varies significantly, and understanding what drives it helps you evaluate whether a quote represents value or a race to the bottom.

The primary cost driver is labour. Officers in central London command higher wages than those deployed in suburban or rural environments, reflecting the cost of living, commuting costs, and market competition for qualified staff. SIA-licensed officers with specialist skills (close protection, dog handling, CCTV operation) command premium rates.
Overnight and weekend rates are higher. Anti-social hours attract the appropriate premium. A provider offering flat-rate, 24/7 pricing without differentiation is almost certainly making an unsustainable margin decision that will affect service quality.
Understand the fully-loaded cost. The hourly rate you see in a proposal covers officer wages, but a reputable provider’s pricing also reflects SIA compliance, insurance, supervision, management, training, equipment, and technology provision. Providers who undercut significantly on hourly rate are almost always cutting in one or more of these areas.
A useful benchmark for London: professional, SIA-licensed manned guarding from an established, ACS-registered provider typically falls in the range of £16–£28 per hour (ex-VAT) depending on role, hours, and location. Significantly below this range should prompt questions.

Step 9: Build an Ongoing Relationship, Not Just a Contract

The best security partnerships are not transactional. Once you have selected and onboarded a provider, the working relationship you build with them determines service quality far more than the contract language alone.

Establish a named account manager. You should have a single point of accountability — someone who knows your site, understands your risk profile, and is reachable when you need them. Providers who rotate account managers frequently, or who assign a named manager but route all contact through a call centre, are not delivering genuine relationship management.
Schedule regular service reviews. Quarterly operational reviews allow both parties to assess performance against SLA benchmarks, identify emerging risks, and adapt the security programme accordingly. Businesses that engage actively with their security provider get better outcomes than those who treat it as a set-and-forget service.
Provide site-specific inductions. Your security officers will be more effective if they understand your business, your people, and the specific sensitivities of your environment. Investing time in a thorough induction — beyond what the contractor provides — pays dividends in officer performance and cultural fit.

Quick-Reference Checklist: Hiring a Security Company in London

Use this checklist before signing any security services contract:

SIA licence verified for all proposed officers via sia.homeoffice.gov.uk
The company holds the SIA Approved Contractor Scheme (ACS) status
Public liability insurance of a minimum of £5 million confirmed with a current certificate
Employers’ liability insurance of a minimum of £10 million confirmed
Formal site assessment conducted, and written risk assessment received
References from comparable sector clients verified by direct conversation
Sub-contracting policy is explicitly addressed in the contract
Digital patrol monitoring and incident reporting confirmed
SLA definitions are measurable and specific, not vague
Officer substitution and continuity provisions included
Pricing is within a credible market range and fully explained
Account manager named and accessible
Exit clause and performance termination provisions understood

FAQs

How much does it cost to hire a security company in London?

The cost of hiring a security company in London varies by service type, hours of coverage, and site requirements. For SIA-licensed manned guarding from an ACS-registered provider, businesses should typically budget between £16 and £28 per hour (ex-VAT). Specialist services such as close protection or dog unit deployment will exceed this range. Providers quoting significantly below market rate should be questioned about what is being omitted from the service model.

Do security guards in London need to be SIA licensed?

Yes. Under the Private Security Industry Act 2001, any individual performing licensable security activities in the United Kingdom must hold a valid SIA licence. This applies to door supervisors, security guards, CCTV operators, vehicle immobilisers, close protection officers, and cash and valuables in transit operatives. Businesses employing unlicensed security personnel — knowingly or otherwise — may face legal liability. Always verify licence status through the official SIA checker.

What is the SIA Approved Contractor Scheme?

The SIA Approved Contractor Scheme (ACS) is a voluntary quality accreditation for security companies operating in the United Kingdom. ACS-registered companies have been independently assessed against a detailed framework covering management practices, service delivery, and compliance. Holding ACS status demonstrates a provable commitment to quality that individual licensing alone does not. Approximately one in five UK security companies holds ACS accreditation.

How do I check if a security company is legitimate?

Verify the following: confirm SIA licensing for individual officers via sia.homeoffice.gov.uk; check ACS company status via the same portal; request and verify a current Certificate of Insurance; ask for companies’ registration details and verify at Companies House; and speak to verifiable reference clients directly. A legitimate, professional security company will welcome and facilitate all of these checks.

What should a security services contract include?

A professional security services contract should include a clearly defined scope of services, measurable service level agreement (SLA) provisions, officer qualification and vetting standards, substitution and staffing continuity terms, incident reporting obligations and timelines, liability and indemnity provisions with defined caps, pricing and escalation mechanics, minimum contract term and exit provisions, and performance-based termination rights.

Can a security company be held liable if something goes wrong?

Liability depends on the terms of the contract and the circumstances of any incident. Security companies can be held liable for negligence, for failure to perform contracted services, or for the actions of their officers. This is why public liability and employers’ liability insurance are non-negotiable requirements. Before signing any contract, ensure you understand the liability cap provisions and that they are appropriate to the value of assets and people being protected.

What is the difference between manned guarding and mobile patrol?

Manned guarding involves security officers stationed at your site on a static basis — typically for extended shifts covering your full risk hours. Mobile patrol involves officers conducting scheduled or random patrol visits to your site as part of a wider geographic circuit. Mobile patrol is generally lower cost but offers less continuous deterrence. Many businesses in London use a hybrid model: static guarding during business hours combined with mobile patrol overnight.

How long does it take to set up a security contract in London?

For an established security provider with sufficient operational capacity, a new manned guarding contract can typically be set up within five to ten working days from contract signature. This includes site inductions, officer assignment, and protocol briefings. For complex, multi-site deployments or specialist requirements, lead times may be longer. Event security typically requires a minimum of two to four weeks’ notice for adequate officer sourcing and briefing.

Conclusion

This guide has been produced by The Surrey Security, an SIA-compliant, professionally operated security services business serving commercial clients across London and the South East. Our operational team includes former law enforcement professionals, industry-certified security managers, and BTEC-qualified security trainers with decades of combined experience in the UK private security sector.

The guidance in this article reflects real-world procurement experience — informed by the questions clients ask us, the mistakes we are routinely asked to remedy, and the standards we ourselves operate to. It is not generic marketing content. It is the advice we would give to a family member who asked, “How do I hire a security company in London without getting it wrong?”

For a no-obligation professional consultation with our London team, visit our London security services page or call us directly.

To understand the operational failures we most commonly help businesses recover from, read our guide to common security mistakes UK businesses make and how to avoid them.