London Construction Security · Buyer Comparison Guide · 2026
10 Construction Site Security Companies in London: Services, Coverage and What to Check
Compare 10 providers for construction site security in London,
with services, coverage, SIA checks and practical buyer questions before you appoint.
This guide lists Citywide Security Company UK first because Citywide publishes the article,
followed by nine other London construction-security providers for buyers to compare. The order after Citywide
is not presented as an independent ranking, score or award.
Quick Answer
A construction-security provider should be able to define who controls access, how visitors and contractors are checked,
how patrols are recorded, which plant or materials require priority protection, how incidents are escalated and what happens
outside working hours. In regulated roles, the operative should hold the correct SIA licence. Company-level ACS approval is
separate from individual licensing and should be checked independently where it matters to procurement.
In This Guide
Jump to the construction-security section you need
Key Takeaways
- Compare the operating model, not only the guard rate. Relief cover, supervision, post instructions, patrol evidence and reporting all affect delivery.
- Individual SIA licensing and company ACS approval are different. Officers are licensed individually; ACS is a voluntary company quality-assurance scheme.
- Construction security should change with the project. Site setup, groundwork, main build, fit-out and pre-handover create different access and asset risks.
- Assignment instructions matter. Access points, patrols, deliveries, keys, alarms, priority assets and escalation contacts should be written down.
- Technology can complement guarding. CCTV towers, alarms and mobile response can reduce blind spots, but suitability depends on layout, risk and response arrangements.
- London geography changes the brief. A constrained City site, a Royal Docks regeneration plot and an Old Oak compound can require very different coverage.
That placement should not be interpreted as an independent industry ranking. The other companies are included so buyers
can compare published construction-security services, coverage and credentials. Company information was reviewed from
public websites in September 2026 and should be re-verified before contract award.
Related Citywide Security Pages
How We Compared
What we checked before including a construction-security company
This is not a review-score exercise. We looked for public evidence that each company serves construction projects
in London or Greater London and publishes enough information for a contractor, developer or project manager to understand
the service before making an enquiry.
Already sourcing guards for a London project? Use Citywide’s London hub to scope officer numbers, shift hours, access duties and reporting before comparing quotations.
10 Companies at a Glance
Construction site security companies serving London
Citywide is shown first because it publishes this guide. The remaining companies are presented for comparison rather
than as a best-to-worst ranking.
| # | Company | Guarding / Access | Patrols | CCTV / Technology | Published Coverage |
|---|---|---|---|---|---|
| 1 | Citywide Security Company UK | Yes | Yes | CCTV support where authorised | London & Greater London |
| 2 | IGI Security Services | Yes | Yes | CCTV towers & alarms | Central London / UK-wide |
| 3 | MavCo Group | Yes | Yes | Monitoring / alarm response options | London & UK-wide |
| 4 | Alpha Security Services | Yes | Yes | CCTV towers & alarm response | 32 London boroughs / M25 corridor |
| 5 | Valion Group Limited | Yes | Yes | CCTV monitoring | Greater London |
| 6 | Quick Force Limited | Yes | Yes | Not central to published offer | London & UK-wide |
| 7 | G3 Security Services | Yes | Yes | CCTV, sensors & monitoring | London |
| 8 | Vigil Security Services | Yes | Published wider patrol service | Digital reporting | Greater London |
| 9 | CODE 3 Security | Yes | Confirm with provider | Confirm with provider | London |
| 10 | Site Security Services (London) | Technology-led rather than guard-led | Mobile response | CCTV, alarms, hoarding, lighting | London & South East |
Comparing these providers for an active London site? Keep the London hub open alongside each quotation so officer duties, reporting and escalation are compared on the same basis.
Provider Profiles
Published services, coverage and checks for each company
Citywide Security Company UK
The publisher of this guide, listed first for transparency rather than as an independent ranking.
Citywide Security Company UK publishes construction site security for developers, contractors and project managers across London and Greater London. Its published service covers SIA-licensed officers, gatehouse duties, visitor and contractor control, delivery monitoring, perimeter patrols, overnight guarding, weekend cover and incident reporting.
IGI Security Services
A London-based provider publishing construction guarding, gatehouse control, patrols and CCTV-led protection.
IGI publishes dedicated construction security services for Central London, including guards, gatehouse control, CCTV towers, alarms and patrols. Its London page states that officers are SIA licensed and vetted to BS 7858, with day, night and weekend cover available.
MavCo Group
A construction-focused security offering covering guarding, access control, patrols, fire-marshal support and reporting.
MavCo publishes construction security across London and the UK, with SIA-licensed officers, manned site guarding, entry and exit control, perimeter patrols, out-of-hours cover and protection for plant and materials.
Alpha Security Services
A layered London construction-security model combining guarding, patrols, CCTV towers, alarm response and access control.
Alpha publishes construction security across all 32 London boroughs and the M25 corridor. Its service includes SIA-licensed officers, GPS-tracked patrols, rapid-deploy CCTV towers, alarm response, gatehouse/access control and reporting.
Valion Group Limited
A London-based provider specialising heavily in construction sites and urgent Greater London deployment.
Valion describes construction security as a primary specialism and publishes manned guarding, mobile patrols, CCTV monitoring, keyholding and alarm response for London construction projects.
Quick Force Limited
A London and UK construction-security provider with static guarding, gatehouse duties and rapid mobilisation.
Quick Force publishes 24-hour construction site security across London and the UK. Its service information covers static officers, gatehouse security, access control, patrols, incident reporting and short-notice deployment.
G3 Security Services
A London construction-security provider combining guarding, access control, surveillance and mobile patrols.
G3 publishes construction security across London with on-site security, risk assessment, surveillance and monitoring, ID and vehicle checks, mobile patrols and support across different construction project types.
Vigil Security Services
A Greater London provider publishing directly employed officers, BS 7858 vetting and digital shift reporting.
Vigil publishes construction site security exclusively for business clients across Greater London. Its service states that officers are directly employed, SIA licensed and BS 7858 vetted, with written specifications and digital shift reports.
CODE 3 Security
A construction-security provider publishing site guarding, traffic management and public-interface duties in London.
CODE 3 publishes construction site security for London building projects and describes close coordination with builders, site managers and production teams. Its London page also lists traffic management and crowd/public-interface duties among the available services.
Site Security Services (London) Ltd
A technology-led construction-security option focused on CCTV, alarms, hoarding, lighting and mobile response.
Site Security Services publishes more than 25 years of site-security work across London and the South East. Its construction offering is more technology and perimeter focused than a conventional manned-guarding model.
Review Site Security Services (London) Ltd official information →
Citywide is one of the companies you are considering? Review the construction-specific duties and coverage separately from this comparison guide.
Construction Security Services
What should construction site security include?
The specification should reflect the actual risks, access points and stage of the build. A high-value compound may need
permanent guarding, while a smaller or quieter plot may be better served by patrols, alarms or a combined plan.
Citywide’s Construction Site Security page sets out its published guarding,
access-control, patrol and reporting model. For London-wide service planning, use
Security Company London.
Need these duties on one live project? Send the address, operating hours, officer count and the main risk concerns so the security brief can be scoped before pricing.
Project Types
Construction-security requirements change by project type
Commercial
Office & Mixed-Use Developments
High-value materials, multiple contractors, deliveries, public interfaces and changing access points.
Residential
Housing & Apartment Schemes
Phased handovers, partially occupied blocks, contractor movement and vulnerable unfinished units.
Refurbishment
Fit-Out & Refurbishment
Occupied neighbours, constrained loading, expensive internal materials and out-of-hours contractor access.
Infrastructure
Civil Engineering & Compounds
Plant, vehicles, remote boundaries, fuel, specialist equipment and extended working hours.
Demolition
Demolition & Strip-Out
Hazardous areas, temporary boundaries, salvageable materials and changing safe-access arrangements.
Vacant Phase
Paused or Pre-Handover Sites
Reduced workforce presence, finished assets, snagging access and higher out-of-hours exposure.
For a London project with changing phases, the London security specification
should be reviewed whenever entrances, occupancy, valuable assets or site working hours materially change.
London Construction Areas
Construction-heavy areas of London and Greater London
London security requirements are highly local. Large regeneration zones, transport-led developments, mixed-use districts
and constrained central sites create different access, perimeter and out-of-hours risks.
Old Oak is currently described by the Mayor of London’s development corporation as one of the UK’s most important
regeneration opportunities, while active development continues in areas such as the Royal Docks and Greenwich Peninsula.
For site-specific planning across these locations, review
Security Company London.
For current UK project, contractor and market news, see
Building.co.uk,
a major UK construction-industry publication.
Working on a London development or regeneration site? The first useful step is to define entrances, vulnerable hours, delivery flows, priority assets and the reporting route.
SIA & ACS
Understand individual SIA licences and company ACS approval
The Security Industry Authority licenses individuals who perform regulated private-security work. The SIA’s Approved
Contractor Scheme is different: it is a voluntary quality-assurance scheme for security companies, and approval applies
to specified licensable activities.
| Check | What It Tells You | Where to Verify |
|---|---|---|
| Individual SIA licence | Whether the named operative holds a current licence for the relevant regulated role. | GOV.UK licence checker |
| ACS company status | Whether a security company is currently approved for specific activities such as Security Guarding or Key Holding. | SIA Approved Contractor Register |
| Published accreditation claim | What the supplier says it holds. It should still be checked against the relevant register or current certificate. | Supplier evidence + official register |
Do not treat “SIA licensed company” and “SIA-licensed officers” as interchangeable phrases. If ACS status is important
to the tender, verify the exact legal entity and approved activities before appointment.
Need properly briefed guards rather than a generic body on site? Use the London hub to define the licence requirement, officer duties, reporting and escalation before deployment.
Assignment Instructions
What should construction security assignment instructions contain?
Assignment instructions turn a quotation into an operational post. They should tell the officer what to protect,
where to be, what to record, who is authorised and what must be escalated.
- Site address, approved entrances and restricted zones
- Named client contacts and emergency escalation numbers
- Contractor, visitor and delivery verification procedure
- Patrol route, frequency and required evidence
- Priority plant, fuel, materials and storage areas
- Gate, hoarding, fence and scaffold-access checks
- Key, fob, alarm and lock/unlock responsibilities
- Incident categories and when police or site management are contacted
- Fire, first-aid and evacuation boundaries for the security role
- Shift handover, Daily Activity Report and incident-report format
Citywide’s construction security service is built around site-specific
duties rather than a one-size-fits-all guard post.
Already have a tender brief or assignment instruction? Send it with the site hours and postcode so the quotation can be compared against your actual scope.
Project Stages
How construction security should change as the build progresses
Boundary integrity, initial access points, temporary welfare, early plant and key-control routines.
Heavy plant, fuel, excavation zones, changing vehicle routes and larger out-of-hours compounds.
More contractors, materials, vertical access, scaffold routes and multiple working zones.
Higher-value internal materials, tools, cabling, M&E equipment and more controlled access.
Finished areas, test equipment, reduced workforce, snagging teams and selective access.
Vacant completed areas, keys, alarms, final defects and higher value concentrated inside the building.
A fixed security plan can become inefficient or incomplete if it is never reviewed. For London projects,
security requirements should be reviewed as the site changes, and the
London construction security specification should be updated when access,
asset value or occupancy materially shifts.
Guards vs CCTV vs Patrols
Which construction-security model fits the site?
| Model | Useful When | Main Limitation to Consider |
|---|---|---|
| Static Guard | Continuous access control, gatehouse duties, contractor interaction or high-value assets need a person on site. | Higher officer-hours and the need for relief / supervision. |
| Mobile Patrol | Several sites or lower-risk periods need visible checks without full-time presence. | Not continuously present between patrol visits. |
| CCTV Tower / Alarm | Open plots, compounds or constrained sites need constant detection and recorded evidence. | Needs a clear monitoring and response arrangement. |
| Combined Model | Large or high-risk sites need guards at access points plus technology across wider boundaries. | Requires clear responsibilities so systems and people do not duplicate or leave gaps. |
Not sure whether you need a guard, patrols or a combined plan? Start with the site risk, hours and access duties rather than choosing the technology first.
Buyer Checklist
17 checks before appointing a construction site security company in London
| # | Checkpoint | What to Confirm |
|---|---|---|
| 1 | SIA Licence | The officer holds the correct current licence for the regulated duties. |
| 2 | ACS Status | If required by procurement, verify the legal entity, approved activity and current expiry. |
| 3 | Vetting | Ask how identity, employment history and suitability are screened. |
| 4 | Insurance | Request current public and employers’ liability evidence appropriate to the contract. |
| 5 | Assignment Instructions | Site duties, patrols, access, keys, alarms and escalation are written. |
| 6 | Access Control | Contractor, visitor, delivery and vehicle procedures are explicit. |
| 7 | Patrol Evidence | Know how rounds are recorded and what happens when a defect or breach is found. |
| 8 | Daily Reporting | Confirm DAR / shift-note format and who receives it. |
| 9 | Incident Reporting | Define thresholds, escalation times and the client contact route. |
| 10 | Relief Cover | Understand how sickness, holiday, lateness and vacancies are covered. |
| 11 | Supervision | Know who manages the assignment and how often performance is reviewed. |
| 12 | CCTV Responsibility | Clarify who monitors, responds, stores footage and handles data. |
| 13 | Keys & Alarms | Document custody, authorised users and response procedures. |
| 14 | Project Changes | Agree how duties and officer hours are varied as the build progresses. |
| 15 | Mobilisation | Confirm induction, start date, uniforms, PPE and first-shift handover. |
| 16 | Commercial Terms | Hours, minimum bookings, premiums, equipment and notice terms are understood. |
| 17 | Named Contact | Have one clear operational and escalation route after the contract starts. |
Ready to compare quotations? Ask every bidder to price against the same hours, duties, reporting and cover assumptions.
Security Costs
What affects a construction-security quotation in London?
A responsible comparison should start with the scope, not a generic hourly number. London pricing changes with officer
count, shift pattern, duties, location, urgency, supervision and any technology or specialist support included.
Labour
Officer Count & Hours
One overnight officer is a different resource commitment from two guards covering day and night gates.
Risk
Site Exposure
Asset value, past incidents, public access, boundary condition and project stage affect the specification.
Duties
Gatehouse vs Patrol
Continuous gate control, delivery logging and contractor checks can require more dedicated officer time.
Technology
CCTV, Alarms & Response
Equipment rental, monitoring and response should be separated clearly from guarding charges.
Citywide’s London security page explains the main quote factors used for
London guarding requirements.
Need an actual price? Send the site postcode, required hours, number of officers and the main duties. That produces a more useful quotation than asking for a generic London guard rate.
Mobilisation
From security requirement to first shift
Address, project type, hours, entrances, officer count, known risks and preferred start date.
Confirm vulnerable periods, assets, access flow, deliveries, patrols and reporting requirements.
Document the post, hours, officer profile, equipment, reporting and escalation route.
Check the relevant licence, experience, site suitability, PPE and assignment instructions.
Confirm access, keys, alarms, site contacts, first-shift handover and welfare arrangements.
Check early reports and adjust duties if the live project exposes gaps or changes.
Need London construction security mobilised? Start by sending the location, first required shift and any existing security specification.
FAQ
Construction site security companies in London: common questions
Does a construction security guard need an SIA licence?
If the duties fall within licensable private-security activity, the individual should hold the appropriate current SIA licence. Buyers can verify licences through the official GOV.UK checker.
Is an SIA licence the same as ACS approval?
No. The SIA licenses individuals. ACS is a voluntary quality-assurance scheme for security companies and applies to specified security activities.
Can construction guards control deliveries and contractor access?
Yes, where those duties are included in the site instructions. The exact verification, logging and escalation procedure should be agreed before deployment.
Should a London construction site use guards or CCTV towers?
It depends on the risk and duties. Sites needing continuous access control usually need people, while CCTV and alarms can strengthen wider perimeter detection. Many projects use a combined model.
What should a Daily Activity Report contain?
It may include shift start and finish, patrols, visitors, deliveries, access issues, incidents, defects, alarm activity, handover notes and actions escalated to management.
Can construction security cover nights and weekends?
Yes. Out-of-hours and weekend guarding is commonly used because workforce presence reduces while plant, tools and materials may remain on site.
How quickly can a security company mobilise?
It varies by location, officer numbers, licence requirements, induction, risk and availability. Treat rapid-deployment claims as site-specific until the start time is confirmed in writing.
Can one provider cover several London construction sites?
Potentially. Ask how officer recruitment, relief cover, supervision, reporting and escalation are coordinated across each address rather than assuming one central contract solves every local issue.
How do I compare construction-security quotations fairly?
Give every provider the same officer hours, duties, project stage, access requirements, reporting standard and equipment assumptions. A cheaper quote is not comparable if it contains fewer hours or responsibilities.
Where can I review Citywide’s London construction-security service?
Use the Security Company London page for geographic coverage and the Construction Site Security page for construction-specific duties.
Construction Site Security London
Compare providers, then build the security specification around your site
If Citywide is one of the companies you are considering, start with our
Security Company London page for London-wide coverage,
then review our Construction Site Security duties before requesting a quotation.