Carol Williams fears deliveries could be affected when the cobbles on The Square are dug up and re-laid.
“Beginning in mid-October is a really bad time,” said Mrs Williams, who runs the family delicatessen Godfrey C Williams and Sons with husband David. “That’s the start of our Christmas trade.”
She said the contractors had been round to businesses on The Square to say they would be accommodating when it came to delivery lorries.
But she added: “At that time of year we have several big deliveries a week so I’m very worried about it.
“Trade has fallen off a bit with everybody tightening their belts and hopefully at Christmas people tend to spend. This is the worst time it could have started.”
She said she was also worried that if The Square was sealed off with barriers it would look unsightly and people would not visit the shops there.
Joy Andrew, of auctioneers Andrew Hilditch and Son, said the contractors had said they would work with traders to the best of their ability with regard to deliveries.
She added: “We’ve had concerns all the way through. It doesn’t affect us the fact it’s happening over Christmas as long as there’s not too much disruption to the road.
“We’ve taken the attitude we are going to do our deliveries even if it means blocking the road.”
Work on the £310,000 planned makeover was due to have started in March this year but it was put back until May because of a delay in permission and so it would not clash with the Sandbach Transport Festival.
Sandbach Partnership chairman Dot Flint said the latest delay had been caused by drainage problems.
She added: “We are reckoning the work will take three or four months but it could be halted for a period to allow Christmas trade or activities to be held.”