Mr Graham said both options cost about the same so he and his wife decided to go for the one in keeping with the old town's heritage values.
"It's quite a historic bridge. It would be a shame to let it rot or fall into the stream.
"We really wanted to keep it the way it was originally ... It should look like it did when it was new."
Katikati bridge builders Bridge It and Tauranga engineering firm Teaki have begun replacing the wooden beams and building a wooden deck for vehicles to cross and are expected to finish in mid-February.
The Grahams will then begin work on a four-bedroom house they are looking forward to moving into from their current home on top of the motel.
Mr Graham said their three children had outgrown the current home and they couldn't wait to have somewhere to play.
Bridge It owner Pat Seuren said the bridge would be a much safer structure when they were finished with it.
"People will still be able to look at it and walk across it and climb over it."
Teaki Engineering consultant Donald Richardson said there weren't too many bridges like it around and very few had been upgraded.