How to Send Large Parcels in the UK | Size & Cost Guide
Weigh it. Measure it. That's the step that decides everything else, because every UK courier has its own cutoff: 20 kg through a standard Post Office branch, up to 70kg if you go with one of the specialist heavy-parcel services.
Skip this, and you risk a rejected drop-off, or a surcharge you didn't see coming. Most people guess the weight instead of checking it.
A box that "feels like 15kg" often turns out closer to 20 once the packaging, tape and filler are added, and that gap is where the trouble usually starts.
What Are The UK Weight And Size Limits For Large Parcels?
Price isn't just about kilos. Carriers also charge on volumetric weight, how much room the box takes up, and for large parcels, that can matter more than the number on the scale.
Royal Mail Limits
At a standard Royal Mail counter, 20kg is the ceiling, and the box can't be bigger than 61cm x 46cm x 46cm. Go over either one and it won't be accepted; you'll need a second box.
Parcelforce and Heavy-Parcel Couriers
Parcelforce takes it up to 30kg, so long as length plus girth stays under 3 metres and no single side is longer than 1.5 metres.
A few specialist couriers go as high as 70kg. Beyond that, wardrobes, appliances, stock on a pallet, a cardboard box isn't really the right tool anymore. Pallet delivery tends to work out cheaper at that point too.
Carrier | Max Weight | Max Dimensions | Best For |
Royal Mail (Post Office) | 20kg | 61 x 46 x 46cm | Everyday large items |
Parcelforce | 30kg | 3m length+girth, 1.5m max side | Bulkier boxes, next-day |
UPS Standard | 70kg | Varies by service | Heavy, single large items |
DPD Drop Off | 20kg | Varies by service | Local drop-off convenience |
Drop-Off Or Home Collection: Which Suits A Large Parcel?
Once you know the weight bracket, the only real question left is whether you carry it there or someone comes to get it.
When Drop-Off Makes Sense
Under 20kg, and liftable by one person into a car boot, that's a drop-off. Cheaper, usually, and fine for anything routine.
When Collection Is Worth the Extra Cost
Heavier than that, or just awkward to hold onto? Book a collection instead. A driver takes it from your doorstep, most carriers only charge a small fee for it, and it beats straining your back trying to wrestle a heavy box into a boot.
How Should A Heavy Or Oversized Parcel Be Packaged?
Nearly every damage claim on a large parcel comes back to the same cause, a box that wasn't sturdy enough in the first place.
Choosing the Right Box
Old single-wall boxes flex and split somewhere along the way, usually right at the seam. Double-walled corrugated cardboard holds up better.
Reinforce the base before you pack anything in, tape the corners and joins heavily, since that's where it tends to fail first.
Wrapping and Securing the Contents
Line the bottom, wrap items so they're not touching the sides directly, fill the gaps rather than leaving them empty.
Loose contents shifting around inside the box cause more breakages than anything that happens outside it. Then weigh it again before you book, couriers charge on that final number, not your earlier guess.
How Can You Find The Cheapest Large Parcel Delivery?
Same box, same weight, and prices between carriers can still differ by several pounds. Running two or three quotes instead of defaulting to whichever name you know is worth the five minutes it takes.
And cheaper doesn't always mean slower: some budget options still deliver next-day, while a couple of the bigger, pricier names take two or three days regardless.
If large parcels are a regular thing rather than a one-off, ask about volume pricing or a business account, the cost per parcel tends to drop once you're not just sending the occasional box.
NREX is building comparison and booking tools for exactly this kind of large-parcel shipping.
Frequently Asked Questions
What's the maximum weight for a parcel sent through a UK Post Office branch?
20kg, with the box capped at 61cm x 46cm x 46cm.
Can I send something heavier than 20kg?
Yes. Parcelforce goes up to 30kg, and some specialist heavy-parcel couriers accept up to 70kg.
Is it cheaper to use a drop-off point or book a collection?
Drop-off, usually, but collection earns its cost for anything heavy or awkward.
Do I need special packaging for heavy items?
A double-walled box, a reinforced base, and shock-absorbing filler. Thin or reused boxes are behind most damage claims.