Stockton's 2021 householder guide puts numbers on the page
Plenty of councils leave you guessing. Not here. Its Householder Extensions and Alterations Supplementary Planning Document was adopted in May 2021, and when a scheme needs an application the case officer will hold your drawings up against it.
At the back, the guide says 3 metres out from the original rear wall should generally be fine for a single storey addition, depending on which way the garden faces and what the neighbours have. Go two storeys and more than 3 metres deep and a 45 degree test kicks in. The line starts at the centre of the neighbour's nearest ground floor habitable room window. Your addition shouldn't cross it. Single storey work gets a wider 60 degree angle, which is more forgiving.
Sideways growth has its own rules. Keep at least 1 metre between the new wall and the boundary, and set a two storey side addition back by at least 1 metre from the front of the house, upstairs at minimum. The council may also ask for a lower ridge. The reason given is the terracing effect, where pairs of semis or closely spaced detached houses join up into one long block. Flat roofs are to be avoided unless the house already has one.
Two less obvious points catch people out. Facing habitable room windows need 21 metres between them, or 11 metres where a side wall faces the back of the next house, plus 3 metres for every metre the ground rises. And if the new space adds a bedroom of 6.5 square metres or more, any extra parking it creates has to fit inside your boundary. On a narrow drive that can decide the whole design.
Choosing a type for a Stockton house
Close to half the borough's homes went up between 1945 and 1982, so these notes mostly concern semis and short terraces of that age.
Out the back, one storey. Outside the conservation areas you can normally build 3 metres deep without applying (4 if the house is detached). Notify the council under the neighbour consultation scheme and the limit becomes 6 metres, or 8 detached, once it agrees or 42 days pass without a decision.
Bigger kitchen. The job we're asked about most on Billingham and Thornaby semis. Decide where the glazing goes at the same time as the units, because a 60 degree check from next door may limit the depth.
Two storeys. Expect to apply. Over a side drive, the 1 metre gap to the boundary and the 1 metre upstairs set-back come straight from the 2021 guide. A two storey rear addition built without permission is capped at 3 metres, and must keep 7 metres clear of the boundary behind.
Knock-through. Taking out the back wall of a post-war house means a steel beam and padstones. The council's building control surveyors will want the engineer's calculations before they inspect.
L-shaped. Its side leg means an application in all 11 conservation areas. On corner plots the council wants the building lines of both streets respected, which often trims the side leg.
Downstairs bedroom. Attach it if you can. Stockton wants annexes for dependent relatives to stay part of the house and able to convert back.
Working from home. A detached cabin can be permitted development on an ordinary plot, but Article 4 directions in parts of the conservation areas take away the outbuilding right too. An attached room avoids that question.
Side return. Mainly a pre-1919 terrace job, where a back offshot leaves a passage beside it. Hemmed in on three sides, a terrace often works best with a pitched roof shared with next door.
Do we need to apply? Search your street on the council's planning register first. Newer estates in Ingleby Barwick or at Wynyard can carry conditions that removed permitted development when the houses were approved.
Cost. We don't print figures. Matching brick and pantile in Norton, flood resistant construction in Yarm, or extra parking to satisfy the guide all change the sum, and a builder on site will see which apply.
Where Class A rights have gone
In all 11 conservation areas the national rules already shrink. No side additions without consent, nothing more than one storey at the back, and no render, timber or tile cladding. Stockton then adds Article 4 directions on the most sensitive parts of every one except Stockton Town Centre and Eaglescliffe with Preston. Where they apply, they list the Class A right to enlarge a house among the rights removed, so check with the council before assuming even a small rear kitchen is permitted. The council's interactive map shows which properties are caught.
Materials matter here as well. The 2021 guide says the council will normally insist that new work matches or complements the house, down to brick size and texture. Round Norton Green and in Hartburn Village that means brick under clay pantiles, not concrete tiles.
High Street flood gates and the beck streets
Yarm has a long flooding record. In 1771 water stood 2 metres deep in the High Street. The Environment Agency now keeps 1.3 kilometres of wall and 32 flood gates there, protecting more than 500 homes and businesses. Defended isn't the same as out of the flood zone, though. Its warning area for the town covers the High Street and adjoining streets, Yarm School and Goose Pastures.
In Stockton itself the worry is Lustrum Beck. The warning area there takes in Bedford Street near Brown's Bridge and the houses beside the beck on Wrensfield Road and Hartburn Avenue. A scheme opened in 2017 added flood walls and a new bridge on Durham Road.
If the government's flood map puts your address in Zone 2 or 3, send a flood risk assessment with any application. Small domestic schemes follow the Environment Agency's standing advice, which starts with floor levels.
Where these facts come from
- Stockton-on-Tees Borough Council: Householder Extensions and Alterations SPD (2021)
- Stockton-on-Tees Borough Council: supplementary planning documents
- Stockton-on-Tees Borough Council: Article 4 directions
- Environment Agency: Yarm Flood Alleviation Scheme
- Environment Agency: River Tees at Yarm flood warning area
- Environment Agency: Lustrum Beck at Newtown Riverside and Hartburn Avenue
- GOV.UK: Lustrum Beck flood scheme opening
- Environment Agency: flood risk standing advice
- GOV.UK: Permitted development rights for householders, technical guidance
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Questions people in Stockton-on-Tees ask
Is there a 45 degree rule in Stockton?
Yes, for two storey additions that project more than 3 metres. Its 2021 householder guide draws the line from the centre of the neighbour's nearest ground floor habitable room window. Single storey schemes are judged on a wider 60 degree angle.
We want a two storey side extension on our semi in Fairfield. How close to the boundary can it go?
Normally at least 1 metre between the new wall and the boundary, with the upper floor set back at least 1 metre from the front. The council may also ask for a ridge lower than the main roof, so the pair still reads as two houses.
Our house in Yarm is behind the flood defences. Do we still need a flood risk assessment?
Probably, if the flood map shows Zone 2 or 3, which it can behind defences. The Environment Agency's standing advice for minor extensions sets out what to include, starting with floor levels. Check the map before drawings are finished.
Will adding a bedroom mean we need another parking space?
Only if the work needs planning permission. Then the council expects any extra parking from a new bedroom of 6.5 square metres or more to be found within your own boundary, using the standards in its Local Design Guide.