Almost every business that books confidential shredding for the first time asks the same question: should the paperwork be destroyed here, or taken away and destroyed somewhere else? Both routes are fully GDPR compliant and both end with a Certificate of Destruction. The difference is cost, convenience and how much of the process you want to see with your own eyes.
What on-site shredding actually involves
On-site shredding, sometimes called mobile shredding, means a shredding vehicle comes to your premises. Your files are wheeled out in locked containers, tipped into the vehicle's shredder, and destroyed within minutes. You can stand and watch it happen, and on most vehicles a screen shows the shredding chamber while it runs. Nothing leaves your site in readable form, so the chain of custody question effectively disappears — the documents never travel intact.
Practically, you need somewhere for a vehicle roughly the size of a bin lorry to stand for twenty minutes to an hour. A loading bay, a yard, a wide access road or reserved kerbside parking is enough. Town-centre offices with no vehicle access are the one case where on-site shredding can be difficult to arrange.
What off-site shredding actually involves
Off-site shredding means your material is sealed into locked containers at your premises, tracked to a secure facility, and destroyed there in bulk. Because industrial plant handles far more volume per hour than a vehicle-mounted shredder, the cost per box is lower — often significantly so on larger jobs. The trade-off is that you are trusting a documented chain of custody rather than watching the destruction yourself.
That chain of custody is not an informal promise. A reputable provider seals the containers in front of you, records the collection, and issues a Certificate of Destruction naming the date and volume destroyed. Ask whether the provider is a registered waste carrier and whether staff are vetted — those two answers tell you most of what you need to know.
Cost: where the difference shows up
For a handful of archive boxes, the two options often cost much the same, because the price is dominated by sending a vehicle and crew to your address at all. As volume rises, off-site pulls clearly ahead. Clearing a storeroom, an archive room or a full office before a lease ends is almost always cheaper off-site.
On-site becomes the better value when the risk profile justifies it — not because the paper is different, but because being able to say, in an audit or an insurance claim, that a named member of staff witnessed destruction has real worth.
When to choose on-site
- Regulated records: legal case files, patient notes, financial and pension paperwork.
- Any situation where your own policy or your client's contract requires witnessed destruction.
- Highly sensitive one-off events: a redundancy round, a litigation file, a board archive.
- Sites where you would rather nothing sensitive leaves the building at all.
When to choose off-site
- Large volumes: archive clearances, office moves, storage unit clear-outs.
- Routine paperwork with no special witnessing requirement.
- Premises with no space for a shredding vehicle.
- Ongoing scheduled collections where cost per visit matters most.
What both should give you
Whichever you choose, insist on the same basics. Lockable containers or sacks supplied before collection, so paperwork awaiting destruction is not sitting in an open box. A registered waste carrier, which you can verify on the Environment Agency's public register. Destruction to a recognised cross-cut standard rather than strip-cut. A Certificate of Destruction recording what was destroyed and when — that certificate is the document an auditor or the Information Commissioner's Office will ask to see. And confirmation that shredded paper is baled and recycled rather than landfilled.
What you should not do
The option that looks cheapest is an office shredder and the general waste bin, and it is the one that has produced real enforcement cases. Desktop shredders jam, overheat, cut in strips that can be reassembled, and consume staff hours nobody costs properly. Worse, bags of shreddings left beside a commercial bin are no longer under your control while still being your legal responsibility. If a bag splits in a car park, the breach is yours.
A practical way to decide
Sort your paperwork into two piles. The first is material where you would be comfortable describing the process as "collected in a sealed container by a registered carrier and destroyed under certificate" — that pile goes off-site. The second is material where you would want to say "I watched it being destroyed" — that pile goes on-site. Most organisations find the first pile is far larger than they expected, and then use on-site destruction selectively for the rest.
If you are weighing up the two options for a site in the North East, call 0333 360 8269 and describe what you have. We will tell you honestly which route costs less for your volume, rather than steering you towards the more expensive one.