Oliver Sainsbury took the seat vacated by Liberal Democrat James Lillis.
The result means the Lib Dems now hold two of the seats, while the Tories hold one.
Result
Phill Brentor (Labour) - 386
Raymond Knight (Green) - 139
Oliver Sainsbury (Conservative) - 682
Jade Seager (Lib Dem) - 515
John Whitby (Independent) - 205
Turnout: 26.92%