The Greenkeeper's shed at a Dumfries golf club was ransacked at the weekend before being set alight.
The blaze at the Pines Golf Centre caused more than £100,000 worth of damage.
Bruce Gray, manager of the Lockerbie Road business said he was "devastated" by the incident.
He added: "This is so painful because we have lost every piece of equipment we own and we are now going to have to borrow everything we need for now.
"We were in the process of changing the name of the place to the Dumfriesshire Golf Centre and all the re-branded stuff - like the signage and golf balls - was in the shed. There is no doubt this was arson as there had been a theft before the shed was set on fire.
"We are all devastated."
Mr Gray's father Duncan believes a quantity of diesel and petrol was also stolen, with some of it used to set the shed on fire.
He said: "Whoever did this must have came in through the woods as we have closed circuit television cameras (CCTV) in the car park which have revealed nothing."
Early police and fire investigations have revealed that the fire was started sometime between 12am on Wednesday, December 31 and 2.30am on Sunday, January 4.
Detective Constable Stephen Bell said two large bangs were heard in the area and nearby residents contacted police and firefighters.
He added: "The extent of the fire was severe and we are lucky it did not spread to nearby woodland area.
"This was a serious fire and inquiries are currently ongoing to establish the cause. The damage caused is believed to be in excess of £100,000. That is a huge amount in any means and will take a great deal of work to repair or replace the damaged equipment."
Anyone who was in the area around the time of the fire or witnessed any suspicious behaviour is asked to contact police on 0845 600 5701.
Police have also been in contact with other golf clubs in the area after an attempted break-in to the shed at Colvend Golf Club in Dalbeattie around 11.20pm on Sunday night.
Source:-Dumfries & Galloway Standard
