Physical, detection, response
Physical perimeter — fencing, gates, lighting — is the largest line item on most sites.
Detection layer — PIDS, perimeter CCTV, thermal — turns the perimeter into a real-time event source.
Response layer — monitoring, keyholder, guard — is what converts detection into action.
What commercial perimeters cost
Ranges assume commercial-grade installations and exclude major civils.
Indicative perimeter security cost by site
Physical + detection + first-year monitoring.
| Feature | Small site | Mid-sized site | Large / complex site |
|---|---|---|---|
| Perimeter length | 100-300m | 300-1,000m | 1km+ |
| Fencing & gates | £8k-£25k | £25k-£120k | £120k-£500k+ |
| Perimeter CCTV | £3k-£8k | £10k-£35k | £40k-£200k+ |
| PIDS | Often omitted | £10k-£30k | £30k-£150k+ |
| Monitoring (year 1) | £600-£1.5k | £2k-£8k | £10k-£40k+ |
In summary
- Physical perimeter dominates capital; monitoring dominates 10-year TCO.
- PIDS is rarely justified below mid-size critical sites.
- Thermal CCTV often beats lighting + optical at long ranges.
Frequently asked questions
Do I need PIDS as well as perimeter CCTV?
On most commercial sites, no. PIDS is justified on critical infrastructure, high-security industrial and where layered defence-in-depth is required.
Why does perimeter length matter more than site area?
Detection and physical protection cost scales with the length of the boundary that must be secured, not the enclosed area. A long, thin site with a kilometre of perimeter can cost more to protect than a compact square site of twice the area. Perimeter length is the first number to establish in any perimeter security budget.
Do I need lighting if I have thermal cameras?
No — thermal cameras detect temperature contrast and are independent of scene lighting. This is a significant saving on remote or rural perimeters where installing and powering lighting is expensive. Visible-light cameras used for evidential identification still need lighting, so most designs combine thermal detection with targeted lighting at chokepoints only.
How much of the cost is planning consent and civils?
On sites requiring new fencing, planning consent, ground surveys and civil works can add twenty to forty percent to the headline perimeter budget. Existing perimeters usually avoid this cost. Solar-powered redeployable towers avoid civils entirely, which is why they dominate short-term or planning-constrained perimeter deployments in both markets.
Are redeployable towers cheaper than fixed perimeter CCTV?
For short-term deployments — six to eighteen months — redeployable towers are significantly cheaper because there are no cabling, groundworks or planning costs. For permanent deployments of two years or more, fixed fibre-connected perimeter CCTV usually comes out ahead on total cost of ownership once tower rental accumulates over that longer period.
How much does PIDS add on top of perimeter CCTV?
Adding PIDS to a perimeter CCTV design typically increases capital by thirty to sixty percent depending on technology choice — fence-mounted sensors are the lower end, buried cable the upper. On most commercial sites, PIDS is not proportionate. It becomes justified on critical infrastructure, government sites and high-consequence industrial premises.
Should perimeter security be procured with the building fit-out?
Yes, if the site is being built out from scratch. Coordinating perimeter cabling, containment and camera positions with the main building programme is materially cheaper than retrofitting afterwards. On existing sites, phasing perimeter security into the next planned maintenance cycle usually delivers better value than a standalone security-only project.
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