How Much Does 24-Hour Security Cost for UK Businesses & Construction Sites?

Published by: Eagle Security Protection · Updated 28 October 2026 · Reading Time: 8 mins

Direct Answer: 24-Hour Security Cost Summary (Commercial Budget Floor)

In 2026, 24-hour security guarding for a UK commercial premises or construction plot typically costs between £13,500 and £19,500 per month (excluding VAT) for a single continuous static guard outside London. This equates to £3,100 to £4,500 per week based on 168 hours of coverage at volume-discounted rates of £18.50 to £22.50 per hour. In Greater London, 24/7 contracts range from £16,000 to £23,500 per month (£22.00–£28.00/hr).

  • 168-Hour Weekly Manned Guarding: £3,100 – £4,500 / week (+ VAT)
  • Monthly Calendar Average (730 Hours): £13,500 – £19,500 / month (+ VAT)
  • Non-Overlapping Out-of-Hours (108 Hours): £1,990 – £2,700 / week (+ VAT)
  • 24/7 Control Room Supervision: Real-time GPS welfare tracking and rapid mobile supervisory backup
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24-hour security officer on night watch at UK commercial construction site

The 168-Hour Math: Why 24/7 Guarding Requires 4 to 5 Full-Time Officers

A complete 24-hour security watch requires staffing 168 continuous hours every week (24 hours × 7 days). Commercial project managers sometimes assume a 24/7 presence can be delivered by two guards working 12-hour shifts daily. Under UK employment law and the Working Time Regulations, this is illegal and operationally impossible.

To maintain 168 hours of coverage without breaching the statutory 48-hour average working week, a professional contractor must schedule a dedicated roster pool of 4 to 5 fully vetted, SIA-licensed officers:

  • Three officers working standard 42–48 hour shift rotas (e.g. 4-on / 4-off 12-hour cycles).
  • One relief officer covering mandatory statutory rest days and weekly roster balances.
  • Reserve capacity to absorb statutory annual leave (5.6 weeks / 28 days per officer), sickness, and emergency relief.

Annual Calendar-Year (8,760 Hours) vs 52-Week (8,736 Hours) Standards

When commercial contracts and invoices are drafted, security providers calculate monthly totals using one of two recognized accounting standards:

  1. Calendar-Year Basis (365 days): 24 hours × 365 days = 8,760 hours/year (8,784 in a leap year). Dividing by 12 gives an exact monthly average of 730.0 hours/month. At an indicative volume rate of £18.50/hr, this equals £13,505.00/month (+ VAT); at £20.00/hr, it equals £14,600.00/month (+ VAT).
  2. 52-Week Contract Basis: 168 hours/week × 52 weeks = 8,736 hours/year. Dividing by 12 gives an exact monthly average of 728.0 hours/month. At £18.50/hr, this equals £13,468.00/month (+ VAT); at £20.00/hr, it equals £14,560.00/month (+ VAT).

Understanding whether your security contractor bills on a 728-hour or 730-hour monthly basis prevents invoice reconciliation disputes and ensures exact budget alignment across financial quarters.

24/7 Security Coverage Models & Expenditure Breakdown

Representative commercial monthly budget projections across standard UK operational models (excluding VAT):

Coverage Architecture Weekly Hours Regional Monthly Budget (730h Avg) Greater London Monthly Budget
Full Continuous 24/7 (Single Officer) 168 hrs / week £13,500 – £16,500 / mo £16,800 – £21,000 / mo
Dual Continuous 24/7 (Two Officers on Duty) 336 hrs / week £27,000 – £33,000 / mo £33,600 – £42,000 / mo
Out-of-Hours (OOH Nights & Weekends) 108 hrs / week £8,800 – £11,200 / mo £11,000 – £14,000 / mo
Continuous Weekend Watch (Fri 20:00–Mon 08:00) 60 hrs / week £4,900 – £6,200 / mo £6,200 – £7,800 / mo

* Indicative guide rates exclude VAT. All contracts include full BS 7858 vetting, SIA licensing audits, and active 24/7 control room check-in monitoring.

The Non-Overlapping Out-of-Hours (OOH) 108-Hour Schedule

Many operational facilities, distribution depots, and construction sites do not require external security guards during normal daytime business hours when operational staff are on site.

When premises are occupied Monday to Friday between 08:00 and 20:00 (5 days × 12 hours = 60 occupied daytime hours), the remaining watch comprises exactly 168 − 60 = 108 hours per week of non-overlapping coverage:

  • Weekday Night Watch: Monday to Thursday nights (4 nights × 12 hours, 20:00 to 08:00) = 48 billable hours.
  • Weekend Continuous Block: Friday 20:00 through to Monday 08:00 (continuous 60-hour watch) = 60 billable hours.
  • Total Weekly Out-of-Hours Cover: 48 + 60 = 108 hours per week.

Adopting the 108-hour Out-of-Hours model delivers complete vulnerability closure during high-risk dark hours while reducing monthly manned guarding expenditure from ~£14,500 down to ~£9,100 (+ VAT).

Hybrid Security Strategies: Lowering 24/7 Expenditure by 30% to 50%

Where commercial project budgets cannot sustain full 168-hour manned guarding costs, modern facilities deploy hybrid security architectures that maintain insurer compliance while trimming overheads:

  • CCTV Tower & Keyholding Hybrid: Deploy a rapid-deployment solar-powered CCTV tower with thermal analytics during nights and weekends (£800–£1,500/month), coupled with professional keyholding and alarm response dispatch (£50–£80/month retainer + callout fees).
  • Static Guard + Random Mobile Patrols: Station a physical guard during peak vulnerability windows (e.g. weekend nights), supplemented by liveried mobile patrol sweeps on weekday evenings. Explore our mobile security patrols in Birmingham for route options.
  • Online Cost Calculator: Use our interactive Security Cost & Budget Calculator to model hourly and monthly configurations for your site.

Frequently Asked Questions: 24-Hour Security Guarding

How much does 24-hour security cost per month in the UK?

In 2026, 24-hour security guarding for a UK commercial premises or construction plot typically costs between £13,500 and £19,500 per month (excluding VAT) for a single continuous static guard outside London. In Greater London, monthly contracts range from £16,000 to £23,500 per month depending on site complexity and officer skill requirements.

How many guards are required to cover a 24/7 shift pattern?

A full 168-hour continuous weekly roster requires 4 to 5 full-time SIA-licensed officers. This ensures full adherence to the UK Working Time Regulations, mandatory statutory rest periods, 5.6 weeks statutory annual leave cover, and guaranteed replacement in the event of illness.

What is the non-overlapping Out-of-Hours (OOH) 108-hour schedule?

When premises are occupied during daytime business hours (Monday to Friday, 08:00 to 20:00 = 60 hours), the remaining watch comprises exactly 108 hours: 48 hours for Monday to Thursday nights (4 nights × 12h) plus 60 continuous hours over the weekend (Friday 20:00 to Monday 08:00). Total = 108 hours/week.

Can I reduce my 24/7 security costs without sacrificing insurance compliance?

Yes. Combining on-site manned guarding during critical shifts with monitored CCTV towers and mobile supervisory patrol visits can reduce total monthly expenditure by 30% to 50% while satisfying insurance underwriting requirements.

Calculate Your 24/7 Site Security Budget

Tell us your site operational schedule, location, and required attendance level. Our operations team will configure an itemised 24/7 guarding roster tailored to your premises.

Submit your site specifications below. All 24/7 contracts include 24/7 central control room welfare monitoring, GPS patrol tags, and emergency management supervision.

Full 24/7 Continuous (168 hrs/wk)
Out-of-Hours (OOH 108 hrs/wk)
Weekend Continuous (60 hrs/wk)
Custom Shift Schedule
Single Officer on Duty
Dual Officers on Duty (336 hrs/wk)
Multi-Guard Team + Supervisor
Ongoing Commercial Contract (12+ Mos)
Fixed Project (3 to 12 Months)
Short-Term Emergency Cover (< 3 Months)
168-Hour Rota Delivery 24/7 Control Room Supervision BS 7858 Vetted

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