Each new seat can be described as a combination of parts of old seats. These tables show this decomposition. The winner of the old seat at the 2019 election is shown by party colour, as is the implied winner of the new seat.
The implied results are calculated using the local election results for the wards which make up each old seat. This should give the most accurate projection, since it reflects varying political behaviour across the seat.
| Party | Old Seats | New Seats | Change | Disappear | Switch Out | Switch In | Fresh |
|---|---|---|---|---|---|---|---|
| CON | 10 | 8 | -2 | -1 | -2 | 0 | 1 |
| LAB | 19 | 17 | -2 | -4 | 0 | 2 | 0 |
| LIB | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Brexit | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Green | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| MIN | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 29 | 25 | -4 | -5 | -2 | 2 | 1 |
The table shows how the various changes affect each party in this area. The total old and new seats are shown for each party, as well as their difference ('Change'). The change in seats is also explained through the four explanations:
The old seats which are disappearing are: Durham, City of; Middlesbrough South and Cleveland East; Newcastle upon Tyne North; Stockton North; Wansbeck.
The old seats which are lost to another party are: Blyth Valley; Durham North West.
The new seats which are gained from another party are: Blyth and Ashington; Durham North West.
The new seats which are freshly created are: Middlesbrough South and Thornaby.
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Billingham and Sedgefield | 62.6% of Sedgefield | 45.1% of Stockton North
14.0% of Durham, City of
1.3% of Bishop Auckland
|
| Bishop Auckland | 98.7% of Bishop Auckland | 9.4% of Durham North West
0.5% of Durham, City of
|
| Darlington | 100% of Darlington | 17.5% of Sedgefield |
| Durham North | 100% of Durham North | 15.3% of Durham, City of |
| Durham North West | 82.0% of Durham North West | 26.1% of Durham, City of |
| Durham, City of, and Easington | 64.3% of Easington | 44.2% of Durham, City of
13.9% of Sedgefield
|
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Blaydon | 51.3% of Blaydon | 43.3% of Newcastle upon Tyne North
14.5% of Newcastle upon Tyne Central
8.6% of Durham North West
|
| Gateshead | 70.2% of Gateshead | 48.7% of Blaydon |
| Houghton and Seaham | 88.2% of Houghton and Sunderland South | 27.0% of Easington |
| Jarrow | 87.1% of Jarrow | 29.8% of Gateshead |
| Newcastle upon Tyne East | 100% of Newcastle upon Tyne East | 12.8% of Newcastle upon Tyne Central
10.4% of Newcastle upon Tyne North
|
| Newcastle upon Tyne North West | 72.7% of Newcastle upon Tyne Central | 46.3% of Newcastle upon Tyne North |
| South Shields | 100% of South Shields | 12.9% of Jarrow |
| Sunderland Central | Unchanged | |
| Tynemouth | Unchanged | |
| Tyneside North | Unchanged | |
| Washington and Sunderland West | 100% of Washington and Sunderland West | 11.8% of Houghton and Sunderland South |
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Berwick and Morpeth | 93.3% of Berwick-upon-Tweed | 37.7% of Wansbeck
5.2% of Hexham
|
| Blyth and Ashington | 64.0% of Blyth Valley | 62.3% of Wansbeck
5.8% of Berwick-upon-Tweed
|
| Hexham and Cramlington | 94.8% of Hexham | 36.0% of Blyth Valley
1.0% of Berwick-upon-Tweed
|
| New seat | Primary component | Secondary component(s) |
|---|---|---|
| Hartlepool | 100% of Hartlepool | 8.7% of Easington
6.0% of Sedgefield
|
| Middlesbrough and Eston | 79.0% of Middlesbrough | 42.8% of Redcar
6.5% of Middlesbrough South and Cleveland East
|
| Middlesbrough South and Thornaby | 44.9% of Stockton South | 41.2% of Middlesbrough South and Cleveland East
21.0% of Middlesbrough
|
| Redcar and Cleveland East | 57.2% of Redcar | 52.3% of Middlesbrough South and Cleveland East |
| Stockton and Yarm | 55.1% of Stockton South | 54.9% of Stockton North |