How close can i build to my neighbours fence

We are looking at having a side extension just to widen the lounge and dining room (single storey). We're very early stages here, but how close can we get to that boundary? Also, how does this impact if we need to have scaffolding around the side for some reason?

Asked by Karen on 12th Dec 2025
Expert Trade Answers
"It depends if your neighbour has build something already like an extension or anything and if they have left a 100 mm gap from boundary line and then you could do the same by leaving the same gap . In any case you have to at least leave 50 mm from your side of the boundary if your neighbour doesn’t care then can start building from boundary line it’s up to you."
Answered on 19th Dec 2025 - Member since Dec 2025 - report
"In the UK, you can build your extension as close as 50mm to your neighbour’s boundary if you have either Permitted Development Rights or Planning Permission, which typically allows for structures up to a certain size without needing a Party Wall Agreement. If you want to build directly on the boundary line, you’ll need a Party Wall Agreement, often involving legal costs and neighbour consent."
Answered on 15th Dec 2025 - Member since Oct 2023 - report
"You can go right up to the boundary once the building is a meter away"
Answered on 6th Jan 2026 - Member since Nov 2025 - report
"You can often build right up to your boundary (0m) for rear extensions with permission/rights, but for side extensions and most garden buildings (sheds, cabins), UK rules usually require at least 1 metre from the boundary, or 2 metres for taller structures"
Answered on 12th Dec 2025 - Member since Apr 2019 - report
"Hi Karen , I am sure you have to be 1 metre from the boundary , Im sure the council planning department will tell you exactly where you can build to ."
Answered on 12th Dec 2025 - Member since Dec 2024 - report
"You can build up to the existing boundary you may need to have a party wall agreement, if you are doing a single story we as the builder will try to seek permission from the neighbours to remove fence to create the shell then reinstate once finished."
Answered on 12th Dec 2025 - Member since Jan 2021 - report
"Karen,

You are allowed to build right up to the boundary but you will probably need a party wall surveyor to sort out the legalities if you are unable to come to an agreement with the neighbour yourself
Scaffolding will be erected on your side of the party wall usually
I hope that answers your question"
Answered on 12th Dec 2025 - Member since Dec 2025 - report
"Up to 50mm apart if you have planning permission
You can errect scaffold anywhere on your property, but for if you need to errect it on neighbours or council land you'll need their permission or court order which might be denied for extension works scaffold."
Answered on 4th Jan 2026 - Member since Dec 2025 - report
"You are allowed to go 1 m from the boundary line provided you have permitted development
And not a listed property or in the green belt"
Answered on 12th Dec 2025 - Member since Jul 2025 - report
"You can build up to 1 metre from the boundary you will be able to erect scaffolding in this space if you need to go closer you will have to submit planing along with building permission best thing to do would to contact your local council building control office for advise"
Answered on 8th Jan 2026 - Member since May 2025 - report
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