In London, whether you need planning permission depends less on the word “renovation” and more on what you’re changing externally, structurally, or in a protected context. I remember assuming I didn’t need permission because I wasn’t building a big extension, but my street had consistent frontage rules and suddenly even small exterior changes became a consideration. It was a good reminder that London councils can vary, and one neighbour’s experience might not match yours.
In general, internal works often don’t need planning permission, but there are important exceptions like listed buildings, flats with restrictive lease terms, or structural changes that still require Building Regulations approval. External changes like extensions, loft conversions, changing windows, altering rooflines, or significant façade updates can trigger planning. Conservation areas add another layer of scrutiny, and permitted development rights can be limited or removed in some places. Separate from planning, you may need Party Wall notices if you share walls with neighbours and you’re doing certain works like cutting into a party wall or excavating near neighbouring foundations.
A good builder can help by flagging red flags early, working with your architect or designer, and coordinating the practical paperwork sequence so you don’t book trades before approvals land. The best ones also keep records that make sign-offs smoother: photos of structural elements before covering up, certificates for electrics and gas, and documentation for insulation and ventilation. Those details matter when Building Control asks questions.
One step-by-step tip: I like to create a “permissions checklist” before signing a contract. I list planning status, Building Control route (plans or building notice), Party Wall needs, and any freeholder or management company approvals. Then I assign who owns each task and the target dates. It turns a fuzzy worry into a simple plan.
For a comprehensive overview, you might want to look at this link.
Before I forget, even when you don’t need planning, I still recommend getting everything in writing and keeping a tidy folder of approvals and certificates, because it saves headaches when you sell.
