About 90 per cent of a typical seat is recyclable. The plastic from the seats is made into new products used in the building industry and metal parts are also recycled. Straps from the seats are used to make recycled bags.
Cr Rob Vinsen, who chairs the council's waste minimisation and environment working party, said the council wanted to see unnecessary waste diverted from landfill and to stop expired seats from being on-sold or donated.
The council has used funding derived from a landfill levy to establish the new service.
"This new initiative is part of a suite of new waste minimisation initiatives that have been identified by council through its Waste Management and Minimisation Plan 2015 and largely delivered through its service partnership with the resource recovery centre," Mr Vinsen said.
The Resource Recovery Centre charges a fee of $5 per car seat to cover costs of recycling.
SeatSmart collects seats in other parts of New Zealand with more than 5000 recycled to date.