Choosing a security company for an industrial site comes down to four checks: SIA Approved Contractor status, the right British Standards, local response times, and proven vetting. A provider that clears all four properly protects a manufacturing site. One that ducks any of them is a risk you end up carrying, not them.

Start with SIA Approved Contractor status.

The first filter is the SIA Approved Contractor Scheme (ACS), the audited register that separates compliant security firms from the rest. Only a minority of UK security companies hold it, so the scheme quickly narrows a crowded market. ACS assessment checks vetting procedures, training records, financial stability, and how a company treats and pays its officers, all of which are reviewed by an independent assessor against a published standard. A firm on the register has opened its operation to that audit and passed it. Ask for the registration number and confirm it on the SIA website before you look at anything else, because a logo on a website proves nothing on its own.

A provider outside the scheme is not automatically bad. It does mean nobody independent has checked their claims.

Match the British Standards to the work.

Industrial security work maps to specific British Standards, and the right provider names them without being asked. BS 7499 covers static guarding and mobile patrols. BS 7858 covers the screening and vetting of staff. BS 7984 governs keyholding and alarm response. A factory needs at least the first two, and usually all three, once keyholding enters the picture. When a sales rep cannot tell you which standards their service meets, that blank tells you how the contract is likely to run once the ink dries and the site goes quiet at night.

Standards are not box-ticking. Each one maps to a real failure a site has suffered before, which is why insurers increasingly ask which ones a provider holds.

Understand factory and manufacturing risk.

Factories carry a risk mix that office sites never see: plant and machinery theft, metal theft, intrusion across a large perimeter, and health-and-safety exposure right at the gate. Specialist factory security pairs gatehouse access control with patrols covering production areas, storage, and yard space, because a manufacturing site spreads its value across the entire footprint rather than locking it in one room. Copper, aluminium, and finished stock move out fast once a site is breached, and thieves who target factories tend to know exactly what they are after. Officers trained on industrial sites also check contractor permits and PPE at entry points, which keeps the security function tied to site safety rather than operating as a separate silo that ignores what happens beyond the barrier.

The danger window is the empty one. A factory on a single day shift sits dark and tempting for sixteen hours, and that gap is where most losses happen.

Local coverage and response times

Response time is where local coverage earns its money, and distance is the factor buyers underestimate most. A provider with officers and a mobile unit near your site reaches an alarm activation in minutes, while a national firm dispatching from two counties away can take the better part of an hour. For premises in Hampshire, working with a security company in Southampton keeps patrol routes short. It gives the same officers repeat exposure to your site, so they notice what looks wrong because they already know what normal looks like at 3 am. Local supervision adds another layer, since a manager who can physically attend a site beats one who can only call about it from a regional office.

Coverage density beats brand size for industrial work. A regional firm with three units within ten miles serves a factory better than a national name spread thin.

Check vetting and training before you sign

Every officer on an industrial contract should be BS 7858-screened, which confirms a five-year check of identity, employment, and any unexplained gaps. Past the baseline, ask what site-specific training the provider runs: fire marshal cover, first aid at work, manual handling awareness, and counter-terrorism awareness (ACT Awareness) for larger or higher-profile sites. A firm that invests in training holds on to its officers longer. That continuity is what makes a guard genuinely useful on a complex manufacturing site, where knowing the layout, the routines, and the regular faces is half the value.

Cheap quotes usually hide thin vetting—the savings on paper turn into costs when an unscreened officer turns out to be the problem.

Get the contract and SLA terms right.

Industrial security contracts are split into three common shapes: permanent static cover, scheduled mobile patrols, and a hybrid that runs both. Permanent cover posts an officer on site for fixed hours, billed by the hour. Mobile patrols visit on a route and suit lower-risk sites that need checking rather than constant watching. The hybrid keeps a static officer on the gate overnight and adds a patrol to sweep outlying yards or a second unit the firm owns. Whichever shape fits, the Service Level Agreement is where the real terms live, so read it for response-time commitments, cover during officer absence, and who pays when a shift goes unfilled. A provider that guarantees backfill for sickness keeps your site staffed on the bad nights, not just the easy ones.

The SLA is also where penalties sit. A contract with no consequence for a missed shift gives the provider no reason to care when one slips.

Questions to ask before signing a contract

Five questions separate a serious provider from a cut-price quote:

1. Confirm your SIA ACS registration number.
2. List the British Standards your service meets.
3. State your average alarm response time for our postcode.
4. Describe your vetting process for new officers.
5. Name the supervisor who will manage our contract.

A provider who answers all five cleanly runs a real operation, and the conversation tends to flow because they have nothing to hide. One who stalls on response times or gets vague about vetting has already told you what you need to know. Leave price until last, after the operation checks out, if you want a contract that holds when something actually happens on site at the worst possible hour.