If you are having an extension built in Didsbury or a barn conversion out near Rochdale, at some point you will look at the pile of copper pipe, the plant on the drive and the open scaffold, and wonder whether you should be paying someone to watch it. The honest answer is that it depends on what is on site, how long it is exposed, and who is legally on the hook if it walks. Here is how to work that out without spending money you do not need to.
Before you price anything, check the contract. On most domestic jobs in Greater Manchester the builder carries the risk for their own tools and plant, and their contract works insurance should cover materials until practical completion. If you have bought materials directly, or the job has paused, that risk often sits with you.
Read your home insurance too. Most policies restrict cover once a property is unoccupied or undergoing structural work, and many will only pay out for theft from an open site if reasonable precautions were taken. That phrase does a lot of work. If a claim fails because the site was left wide open, no amount of arguing afterwards helps.
Not every site needs guarding. What raises the risk is fairly predictable, and most of it is about visibility, access and what is left lying about overnight.
For a typical domestic extension, layered basics are usually enough. Hoarding or Heras fencing with anti-lift clips, a lockable store or container for high value materials, and good lighting will handle opportunist theft, which is the majority of what we see on residential jobs.
Where the value on site climbs, monitored technology is the middle ground. A redeployable CCTV tower or a battery powered alarm with a monitoring contract typically runs in the low hundreds of pounds per week, depending on how many units, how long the hire is and whether you want live audio challenge. Manned guarding is the most expensive option and is generally only justified on larger new build plots, sites with repeated incidents, or during high risk phases such as first fix when copper and cable are on site in quantity.
A sensible rule of thumb: if replacing a single night's losses would cost more than a month of monitoring, monitoring is probably worth it. If the most valuable thing on site is a bag of sand and half a pallet of blocks, it is not.
Plenty of what protects a site is scheduling rather than spending. Time deliveries so materials arrive the day they are needed rather than sitting for a fortnight. Ask your scaffolder to fit alarms or remove ladders and lower lifts at the end of each day. Get plant marked and registered, and fit a tracker to anything worth more than a few thousand pounds.
Keep a simple record of what is on site, with photographs and delivery notes. Insurers ask for this, and without it a claim becomes a negotiation about your memory. Tell neighbours what is happening and roughly when work finishes each day, because a neighbour who knows the site is empty by five is far more likely to ring you when a van turns up at nine.
Security and safety overlap on a domestic site. Under the Construction (Design and Management) Regulations, sites must be kept secure against unauthorised access as far as reasonably practicable, and that includes children. An open excavation, an unsecured scaffold or stacked materials on a street in a residential area is a duty of care issue, not just a theft one.
For most homeowners this means proper fencing and gates rather than guards. It is also the point where local authority and neighbour complaints tend to start, so getting it right early saves aggravation later.
Usually not in full, because most policies restrict cover during structural work or when a property is unoccupied. Ring your insurer before work starts and ask specifically what is excluded, then check whether your builder's contract works policy fills the gap.
Monitored CCTV with live audio challenge stops most opportunist theft because intruders are spoken to within seconds and know they have been recorded. Guards make more sense where there is repeated targeting, high value plant, or where access needs controlling during working hours as well.
Fencing and a lockable store can usually be arranged within a few days. Redeployable CCTV or alarm units often go in within a week depending on availability, so it is worth booking before the high risk phase rather than after an incident.