Two households the same distance from a warehouse can be quoted very different delivery charges for similar furniture. The number is built from time and labour rather than from mileage.
The vehicle is booked by the slot
Furniture moves on dedicated vehicles running planned routes, and the scarce resource is the delivery slot rather than the fuel consumed reaching an address.
A stop that takes forty minutes uses the same route capacity as several quicker drops combined, which is why bulky or awkward items attract higher charges.
Distance matters mainly because it determines how many stops fit into a shift, not because of the direct cost of covering the ground.
Crew size is the largest variable
A single driver can handle flat-packed goods, while an assembled sofa or a heavy appliance requires two people for the entire route, doubling the labour cost of every stop that day.
Once a two-person crew is required for one item, the whole vehicle is staffed that way, so a single large piece can shift an entire order into a more expensive tier.
This is why splitting a mixed order into separate deliveries occasionally reduces the total charge rather than increasing it.
Access difficulty is priced before arrival
Stairs, narrow doorways, upper floors without lifts and restricted parking all extend the time a crew spends at an address, and retailers ask about them for that reason.
An undisclosed access problem turns a planned stop into a much longer one, disrupting every subsequent delivery on the route.
Failed deliveries are the expensive outcome, because the item returns to the warehouse and the whole journey must be repeated with nothing sold.
Bundled services hide inside the fee
Charges often include assembly, packaging removal or the collection of an old item, and these are separate labour tasks rather than parts of the transport.
Disposal in particular carries its own cost, since old furniture and mattresses must be taken to a facility that will accept them.
Comparing delivery prices between retailers is only meaningful once the included services are matched, because the cheapest headline figure frequently covers the least work.
Free delivery is a threshold, not a gift
Retailers waive the fee above a spending threshold because the delivery cost is fixed while the margin on a larger order is not, so bigger baskets absorb it comfortably.
Below that threshold the same cost still exists and is charged directly, which is why small furniture orders can carry surprisingly high fees.
The threshold is set where the margin on the order covers the route cost, which is the same calculation that sets the fee itself.