020 7864 7245 [email protected] WhatsApp
Planning guide · Sutton

Permitted development in Sutton

Single-storey rear extensions, lofts and side extensions you can build in Sutton without full planning — and the exceptions.

Quick answer

Borough
Sutton
Planning authority
Sutton Council
Conservation areas
17
Statutory determination
8 weeks
Our approval rate
98% first time

Victorian terraced street in London — planning drawings in Sutton

How does Sutton decide a larger extension?

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 routeSuttonLondon
Prior approval not required2989,067
Granted341,930
Refused1313,646
Grant rate20.6%34.6%
Decided within 8 weeks98.6%
Lawful development certificates97236,657

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 detail

Answers for Sutton

What can I build under PD in Sutton without planning?

Single-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.

Does Permitted Development apply to flats in Sutton?

No. Permitted Development rights apply only to houses (Class C3 dwellings). Flats and maisonettes require full planning for almost every external alteration.

Are PD rights different in a conservation area?

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.

What is a Lawful Development Certificate?

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.

Do I need building regulations even under PD?

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.

Related guides for Sutton
An architectural technologist checking a printed set of house drawings, marking a proposed elevation in red — permitted development in Sutton
Every set is checked line by line against the validation checklist before it leaves the office.
Book a call

Speak to a chartered technologist — free 15 minutes

Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.

Which Sutton postcodes does this permitted development scheme service cover?

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.

PostcodeAreaDominant stockWhat it means for a permitted development scheme
KT4Worcester Park1930s semi-detachedWorcester 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.
SM1SuttonEdwardian terraces, 1930s semi-detachedSM1 covers Sutton only; Sutton Council handles the permitted development scheme.
SM2Sutton / BelmontGeorgian villas, 1930s semi-detachedSM2 covers Sutton / Belmont only; Sutton Council handles the permitted development scheme.
SM3Cheam / North CheamGeorgian villas, 1930s semi-detachedA 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.
SM5CarshaltonVictorian terraces, Georgian villasSM5 covers Carshalton only; Sutton Council handles the permitted development scheme.
SM6Wallington / HackbridgeEdwardian villas, 1930s semi-detachedWallington / Hackbridge sits wholly inside SM6, so Sutton Council validates every permitted development scheme submitted from an SM6 address.
SM7Banstead1930s semi-detached dominates; Edwardian terraces and villas in Sutton central; Victorian cottages in Carshalton; post-war in HackbridgeSM7 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.

Which Sutton neighbourhoods suit a permitted development scheme best?

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.

Does Sutton planning policy restrict a permitted development scheme?

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.

Who decides a permitted development scheme on the edge of Sutton?

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.

A printed planning application drawing set — proposed elevations, floor plans and the os location plan with the site outlined in red — permitted development in Sutton
The planning set that goes to the council through the Planning Portal: proposed elevations, plans, and the OS location plan with your site outlined.

Need help in Sutton?

Same-day fixed quote. MCIAT chartered. 98% first-time approval rate.

Start free quoteOr contact us about your project first

Found this useful? Share it

Copies the headline and the link, ready to paste anywhere — helpful if you are planning an extension with a neighbour, builder or architect.

Free quote in 60 seconds
Call us Free quote →

Before you go…

Get a free, no-obligation quote for your project. MCIAT chartered.

council-ready drawing review · All 33 London boroughs