Single-storey rear extensions, lofts and side extensions you can build in Sutton without full planning — and the exceptions.
Quickly, and often against. Sutton granted 34 larger home extension notifications and refused 131, a 20.6% grant rate against 34.6% across London, while telling 298 households no prior approval was needed. It settled 98.6% of householder decisions inside eight weeks.
| Larger home extension route | Sutton | London |
|---|---|---|
| Prior approval not required | 298 | 9,067 |
| Granted | 34 | 1,930 |
| Refused | 131 | 3,646 |
| Grant rate | 20.6% | 34.6% |
| Decided within 8 weeks | 98.6% | — |
| Lawful development certificates | 972 | 36,657 |
Sources: MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026. A zero in this return means the measure was not recorded for that borough, never that no such decisions exist. Open Government Licence v3.0.
In detailSingle-storey rear extension up to 3m deep (attached house) or 4m (detached); side extension up to half the original width; loft conversion up to 40m³ (terraced) or 50m³ (semi-detached); single-storey outbuilding within the curtilage; replacement windows and doors. All subject to material match, eaves setback (20cm), and not facing a highway.
No. Permitted Development rights apply only to houses (Class C3 dwellings). Flats and maisonettes require full planning for almost every external alteration.
Yes — significantly reduced. In a conservation area: side extensions and two-storey rear extensions are not PD; cladding is not PD; chimney removal needs planning; roof additions are restricted.
An LDC is a formal confirmation from the council that your proposal is lawful PD — recommended before building, useful when selling. Costs around £103 for council fees + drawings.
Yes. Building regulations are entirely separate from planning. Permitted Development removes the planning requirement only — you still need building control sign-off for structure, insulation, fire safety, drainage, and ventilation. We deliver both planning and building regs drawings.



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Every Sutton postcode district we draw in, the stock that dominates it and the authority that validates a permitted development scheme there. Sutton fees below are the statutory England rates for 2026, not permitted development scheme estimates.
| Postcode | Area | Dominant stock | What it means for a permitted development scheme |
|---|---|---|---|
| KT4 | Worcester Park | 1930s semi-detached | Worcester Park straddles boundaries rather than sitting inside one borough: Sutton covers part of KT4, Kingston upon Thames another part, and the Surrey side belongs to Epsom and Ewell Borough Council. Permitted development is where this bites hardest, because rights are withdrawn by article 4 directions made authority by authority, and a direction issued by one council has no effect a street away in another. A lawful development certificate is likewise issued by the authority for the address, so the first step is establishing which one that is. |
| SM1 | Sutton | Edwardian terraces, 1930s semi-detached | SM1 covers Sutton only; Sutton Council handles the permitted development scheme. |
| SM2 | Sutton / Belmont | Georgian villas, 1930s semi-detached | SM2 covers Sutton / Belmont only; Sutton Council handles the permitted development scheme. |
| SM3 | Cheam / North Cheam | Georgian villas, 1930s semi-detached | A permitted development scheme at an SM3 address in Cheam / North Cheam is determined by Sutton Council under its own Local Plan policies for Cheam / North Cheam. |
| SM5 | Carshalton | Victorian terraces, Georgian villas | SM5 covers Carshalton only; Sutton Council handles the permitted development scheme. |
| SM6 | Wallington / Hackbridge | Edwardian villas, 1930s semi-detached | Wallington / Hackbridge sits wholly inside SM6, so Sutton Council validates every permitted development scheme submitted from an SM6 address. |
| SM7 | Banstead | 1930s semi-detached dominates; Edwardian terraces and villas in Sutton central; Victorian cottages in Carshalton; post-war in Hackbridge | SM7 sits outside Sutton's permitted development regime because it sits outside Sutton. Banstead is in Surrey, and prior approvals, certificates of lawfulness and any Article 4 restrictions there are matters for Reigate and Banstead Borough Council. Householders often read the SM postcode as proof of a London borough. It is not, and the two councils withdraw rights in different places. |
Roof pitch, wall build-up and plot depth change every few Sutton streets, and each one changes what a permitted development scheme can achieve at that address.
Conservation areas covering Sutton: Sutton Council runs 17, and Sutton Central, Carshalton Village, Beddington Park are the ones Sutton owners meet most. A permitted development scheme inside a Sutton conservation area loses permitted development, so the Sutton submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Carshalton Village a permitted development scheme is judged on the street elevation first.
Sutton permitted development status: there is no borough-wide direction from Sutton Council, so a permitted development scheme at a KT4 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Sutton sale to argue it later.
What Sutton is built from: 1930s semi-detached dominates; Edwardian terraces and villas in Sutton central; Victorian cottages in Carshalton; post-war in Hackbridge. Outer south London suburban; generally permissive; Carshalton and Cheam conservation areas add heritage in pockets. That mix decides the permitted development scheme route in Sutton more than the postcode does.
Sources for this Sutton permitted development scheme page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.

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