There were 52 by-elections in the period January to April 2013 with 15 (29%) changing hands.
Party | Candidates | Defended | Retained | Gained | Lost | Won |
Conservative | 51 | 16 | 7 | 1 | 9 | 8 |
Labour | 48 | 25 | 23 | 4 | 2 | 27 |
Lib Dems | 42 | 6 | 5 | 5 | 1 | 10 |
SNP | 3 | 2 | | | 2 | |
Plaid Cymru | 1 | | | | | |
BNP | 7 | | | | | |
Greens | 20 | | | | | |
UKIP | 29 | | | 3 | | 3 |
Resident Groups * | 8 | | | | | |
English Democrats | 3 | | | | | |
National Front | 1 | | | | | |
Socialist Party (GB) | 2 | | | | | |
TUSAC | 7 | | | | | |
Lewisham PBP | 1 | | | | | |
Elvis Party | 1 | | | | | |
Independents ** | 19 | 3 | 2 | 2 | 1 | 4 |
No description | 1 | | | | | |
Total | 244 | 52 | 37 | 15 | 15 | 52 |
* 8 Resident groups contesting 7 seats
** 19 candidates contesting 14 seats.
Conservatives: - gained Wirral MB, Leasowe & Moreton East from Labour on 17th January
- lost Dudley MB, Wollaston & Stourbridge Town to Labour on 31st January
- lost Wirral MB, Pensby & Thingwall to Labour on 28th February
- lost North Norfolk DC, Cromer Town to Lib Dems on 21st February
- lost Arun DC, Aldwick East to the Lib Dems on 14th March
- lost North Dorset DC, Lodbourne to Lib Dems 21st March
- lost Runnymede BC, Foxhills to UKIP on 14th March
- lost Havering LB, Gooshays to UKIP on 21st March
- lost North Lincolnshire UA, Humberston & New Waltham to UKIP on 4th April
- lost South Staffordshire DC, Perton East to an Independent on 14th February
Labour
- in addition to the 2 gains and 1 loss to the Conservatives
- gained South Lanarkshire UA, Rutherglen South from SNP on 14th February
- lost Dacorum BC, Adeyfield West to the Lib Dems on 21st March
- gained Islington LB, Junction from Lib Dems on 21st March
Lib Dems- in addition to the 3 gains from the Conservatives, 1 gain from Labour and 1 loss to Labour
- gained Chelmsford BC, Broomfield & The Walthams from an Independent on 19th February
SNP- in addition to the 1 loss to Labour
- lost Moray UA, Heldon & Laich to an Independent on 7th March
UKIP
- no other gains apart from the 3 from Conservatives
Independents- 1 gain from the Conservatives, 1 gain from SNP and 1 loss to the Lib Dems