He said it was just a short drive to the station and he "didn't want to leave someone hanging".
Since purchasing the garage, Mr Simmonds has expanded it to two-and-a-half times its original size and has added a car park.
"When we took over the business one of the things we wanted to do was get a bus shelter in for the customers.
"It was just part of the upgrade and... saves them from standing out in the rain."
Mr Simmonds said he was trying to make the station "look as Greytown as possible" and the renovations were close to being finished.
A bullnose verandah and a facade had been added to the building and the mono-pitched "very 70s and quite ugly" roof had been cut off.
The outside of the building would blend in well to the rest of the town, Mr Simmonds said.
A barista will start in the next few weeks making fresh coffee and Lotto facilities had recently been introduced.
Mr Simmonds said getting the bus shelter put in was "something that we could do for the community".
"It's no major cost to us, it's a small parcel of land that we are giving up."
Corryn Elliott, assets advisor for GWRC, said the shelter was likely to be installed before the end of November.
"We have a few shelters going in around the region and that is one we have prioritised to get in soon," she said.