Manx Gas says it has completed its natural gas conversion project on time and under budget.
The project manager, Aidan Baglow, says the work has cost £19.5 million, £4 million less than was allocated by Tynwald.
The project has converted LPG and Towns Gas homes to natural gas, ahead of the introduction of an all-Island tariff next month.
Mr Baglow says despite the of the project his staff did notice poorly maintained appliances inside some homes: