A council-run crematorium in Bath is installing larger cremators so it can cope with the increasing number of "oversized" coffins.
The move comes after bosses at Haycombe Crematorium had to turn families away because their loved ones were too big to be cremated at the site.
Bath and North East Somerset Council is spending £800,000 on the work which will also help cut mercury pollution.
Work is expected to start this week and will continue for four months.
'Nobody turned away'
"We have to turn away one or two people a month who are just too big and of course it's very upsetting for the families," Rosemary Tiley, the crematorium's bereavement manager said.
"When I started 10 years ago it would be one or two a year but we are aware of it happening quite often now.
"We also have to deal with people who only just fit into the cremator and that isn't really ideal."
A council spokesman said it was making the investment to enable the best possible service to residents.
"If for any reason we are unable to meet the needs of the family, we help them to make alternative arrangements. Nobody is turned away," he said.