Updated October 2026 · Fraser Bond
Planning · England
Planning permission explained
Permitteddevelopment
Article 4in London
8 weekstypical decision
LDCcertainty
In short: You need planning permission for most new building, significant extensions and changes of use. Many smaller house extensions and lofts fall under permitted development rights, but these don't apply to flats, and many London boroughs have Article 4 directions and conservation areas that remove them. A lawful development certificate confirms that work doesn't need permission. Householder applications are usually decided within eight weeks, larger ones within 13 weeks. Pre-application advice from the council can save time.
The process
1
CheckPermitted development, conservation area, Article 4, listing.
2
Pre-appOptional council advice.
3
ApplyVia the Planning Portal with drawings and fees.
4
ConsultationNeighbours and consultees comment.
5
DecisionUsually 8 weeks for householder applications.
Frequently asked questions
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How long does permission last?
Usually three years to start work.
Can I appeal a refusal?
Yes, to the Planning Inspectorate.
