London’s fast-paced environment and status as a global business and cultural hub demand exceptional security services. From corporate offices and high-net-worth individuals to large-scale public events, having the right security partner is essential. Whether you need discreet close protection, advanced surveillance systems, or trusted manned guarding, the city is home to several outstanding security firms. Here’s a carefully curated list of the Top 10 Security Companies in London for 2025, known for professionalism, reliability, and innovation.
1. SG London – Bespoke corporate security with a local touch
SG London has earned a reputation for excellence with its highly trained operatives, tailored security plans, and discreet service. With years of experience and a focus on high-risk individuals and sensitive operations,
SG London specialises in corporate guarding, front‑of‑house concierge, and risk consultancy for Grade‑A offices and luxury retailers. What sets SG London apart is its technical approach, a dedicated account manager, Verified Guards. They provide duty in Smart uniforms having body‑worn cameras. Clients range from fintech start‑ups to embassies—evidence that big results don’t always require the biggest multinational.
SG London is a trusted name among VIPs, corporations, and diplomatic clients in the UK.
2. Mitie Security – The UK’s largest manned‑guarding provider
In London, its Integrated Security division blends traditional guarding with drone patrols, GSOC (Global Security Operations Centre) monitoring, and in‑house cyber‑threat intelligence—ideal for blue‑chip organisations needing both physical and digital protection. Mitie’s 2025 sustainability roadmap, which includes a fully electric mobile‑patrol fleet, also appeals to ESG‑focused clients.
3. G4S Secure Solutions (Allied Universal) – Global reach, local expertise
Few brands are as recognisable as G4S. Now part of Allied Universal, the firm still runs a dedicated UK business unit, offering everything from manned guarding and cash solutions to threat intelligence and secure events. Its London portfolio spans critical infrastructure, government sites, and major entertainment venues. Clients praise G4S’s depth of resources—should an incident occur, relief officers and specialist teams can be mobilised city‑wide within minutes.
4. Securitas UK – Technology‑led protective services
Securitas pioneered the “six protective services” model, combining mobile patrols, remote video, and on‑site guarding into a single contract. In London, the company’s Command Centre in Uxbridge monitors thousands of CCTV streams, using analytics to spot intruders before they reach the door. Securitas also offers risk assessments specific to London’s transport hubs, making it a favourite among logistics and aviation clients.
5. Wilson James – Data‑driven security for complex operations
From Heathrow’s airfields to the Tate Modern, Wilson James secures some of the capital’s most complex environments. Its award‑winning “Operational Insight” platform crunches footfall, threat, and compliance data to optimize guard deployment. Sector specialists—aviation, construction, and critical national infrastructure—ensure officers arrive trained for the exact risks on site.
6. Corps Security – 165 years of heritage and social value
Founded in 1859 to find employment for ex-servicemen, Corps remains the UK’s only major security business run as a certified Social Enterprise. Services range from manned guarding to CCTV monitoring and consulting. London clients value Corps’ military‑grade discipline combined with hospitality‑level customer service; the firm’s new “manned‑guarding savings calculator” helps FM teams right‑size their cover without compromising safety.
7. Bidvest Noonan – A dedicated London business unit
Bidvest Noonan recently launched a London‑centric division to deliver bespoke solutions for high‑profile buildings in the capital. By combining manned guarding, reception services, and IoT‑enabled electronic security, the company tailors packages to corporate, real‑estate, and life‑sciences clients. Its 2025 programme to chair a global initiative on tall‑building security underlines a commitment to thought leadership.
8. SmartSec Solutions – Boutique protection for premium estates
SmartSec’s USP is image: officers wear tailored uniforms, receive customer‑experience training, and operate unobtrusive earpiece comms. The firm specialises in corporate and mixed‑use estates, where tenant satisfaction scores matter as much as incident‑free metrics. A cloud‑based visitor‑management platform integrates seamlessly with most CAFM systems, delivering real‑time analytics to FMs on the go.
9. Kingdom Services Group – Integrated FM and security
Kingdom combines security guarding with cleaning and environmental services, offering cost‑effective bundled contracts—a strong draw for retail parks and distribution centres. The London control room complies with BS 7499 and BS 7858, and a proprietary “Kingdom Shield” app allows clients to track patrols, incidents, and KPI performance live.
10. 1st Class Protection – VIP residential and close protection
When CEOs or UHNW families need discreet protection, many turn to 1st Class Protection. Officers undergo advanced defensive‑driving and surveillance‑detection courses, while residential packages include 24/7 manned gates, mobile patrols, and rapid alarm response across Zones 1–6. The company’s modest size ensures direct director‑level contact and swift decision‑making—a key differentiator in fast‑moving threat scenarios.
Conclusion – Choosing the right partner
Every organisation’s risk profile is unique, but the names above represent London’s gold standard. Use this Top 10 Security Companies in London guide as a starting point, then conduct site‑specific risk assessments, Check Google Reviews, and ask for case studies before signing a contract.
Remember: the most expensive provider is not always the best fit—responsiveness, cultural alignment, and transparent reporting often matter more. Partner wisely, and you’ll gain more than guards on a gate—you’ll secure peace of mind for everyone who walks through your doors.