John Lewis is proposing new contracts for its delivery staff, which will see them work longer shifts but over fewer days in the week.
The retailer is also proposing to make staff canteens self-service, as it seeks to cut costs and modernise. The changes will affect about 700 drivers across 20 delivery hubs.
The contracts will also allow the introduction of bank holiday and Sunday deliveries in the future. John Lewis depots do not currently operate on those days.
A spokeswoman for John Lewis said: “We need to reflect how and when our customers are shopping with us, and customers increasingly want flexible shopping and delivery times. As a result, we are talking to our driver partners about changing their working patterns to work fewer days in a week but more hours in a day. We believe the changes will meet the needs of our customers better.
“We do not take any decision to change our partners’ working practices lightly. We have engaged our partners through democratic channels, and have had many positive responses, including some partners being pleased at having an extra day a week at home.”
John Lewis Partnership is expected to reveal a cut in its staff bonus later this morning, from 11% in 2015 to around 9%.