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Free 2026 London Planning Report — Belmont SM2

Paved rear garden with a lawn, a black pergola over wicker seating and a pale rendered house with large sliding glass doors
SM2 · Belmont · Sutton

Planning and building regulation drawings in Belmont (SM2)

Belmont climbs. The suburb grew on the chalk downs around Belmont station, on a line that opened in 1865, and its semi-detached houses run up the slope toward Banstead Downs. Most date from the interwar years, with a bay at the front and a hipped roof above, and a scattering of Edwardian and postwar houses sits among them. Downs Road, Burdon Lane, Warren Avenue, Manor Road, The Avenue, Shirley Avenue, Northdown Road, Wilbury Avenue, Godolphin Close, Highview, Downs Side and The Drive are among its roads.

  • MCIAT chartered technologists
  • London Borough of Sutton granted 93% of 635 householder applications
  • Drawings in about 7 days

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The slope changes how people build. Ground levels step between neighbours, so the height of a rear extension, any retaining wall and the way a new window looks into the next garden all depend on levels taken from the site, which is why the drawings carry level datums from the start. Gardens are regular but not endless, and a single-storey rear extension can only go so deep before it leaves the permitted development limits and needs a full householder application.

Because the pairs are so alike, the council reads changes against the street. Front elevations, roof forms and materials sit against a settled rhythm, and an addition is expected to match the original brick, render, bay detail and roof tile so that it reads as part of the house. Semis share a wall with the neighbour, so party wall matters and overshadowing sit at the centre of the design. We know of no conservation area in Belmont, and no area-specific Article 4 direction is published for it.

Planning in Belmont: what to know before you apply

Sutton applies its borough-wide permitted development limits and householder design guidance in Belmont, and nothing at area level narrows them further. A rear extension, a loft conversion or a modest side addition may therefore be possible without a planning application, provided each limit is met exactly. When a scheme goes past the limits, or the house is a flat, which has no householder permitted development rights, it needs a full application. The council expects the proposal to respect the established frontage and the way houses step up the hill, and on sloping plots the drawings need to show how the extension sits against neighbours' ground levels. We check the property for any designation before choosing a route, and the sections show the levels clearly.

Applications are decided by London Borough of Sutton — its planning pages.

Check your route

Does your Belmont project need planning permission?

Route check · Belmont (SM2)

Listed building?
Conservation area?
Likely permitted development — no planning applicationNeeds checking
  • A single-storey rear extension up to 4 m deep on a detached house, or 3 m on any other house, is Class A permitted development subject to the height and materials conditions.
  • This council does not publish its Article 4 directions to the national register, so the schedule is confirmed with the council first.
  • One or more constraints are unknown — we check the council's registers as part of the free appraisal.
  • Where permitted development applies, a lawful development certificate proves it for lenders and buyers.

Sources: GPDO 2015, Schedule 2, Part 1 · Planning Portal — common projects · Building Regulations 2010 — when approval is needed

This is a first-pass indication from the national rules, not planning advice for your property. Your council's registers, any Article 4 schedule and the exact dimensions decide it — the free appraisal checks all three before we recommend a route.

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Belmont (SM2) in numbers

What London Borough of Sutton has decided, and what SM2 is built of — the two facts that shape every job here.

Householder planning decisions — London Borough of Sutton

Belmont (SM2) applications are decided by London Borough of Sutton; these are its published householder figures for the last four quarters.

Householder applications decided2025 Q2 to 2026 Q1635
Granted589
Refused46
Grantedof 635 decisions · England 90%93%
Decided within 8 weeksof 596, excluding prior approvals97%

Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Permitted development prior approvals — London Borough of Sutton

How the larger-home-extension route has fared with London Borough of Sutton, which decides SM2 notifications.

Larger home extension prior approvals — not required2024 Q2 to 2026 Q1188
Prior approval granted26
Prior approval refused73
Grantedof 99 determined26%

Source: Ministry of Housing, Communities and Local Government (PS1 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Planning appeals — London Borough of Sutton

Refusals in SM2 can be appealed to the Planning Inspectorate; this is London Borough of Sutton's householder appeal record.

Householder appeals determined2021–2026148
Allowed61
Allowedof 148 · England 36%41%

Source: Planning Inspectorate appeals casework. Open Government Licence v3.0 Extracted 2026-09-22.

Conservation areas and Article 4 directions — London Borough of Sutton

Register counts for London Borough of Sutton. A count describes what the council has published, never a rank against another council.

Conservation areas in the register15

Source: MHCLG Planning Data Platform. Open Government Licence v3.0 Extracted 2026-09-22.

What SM2 is built of

Residential building form across Belmont (SM2), from 395 classified buildings — the fact that decides party walls, side returns and loft headroom before any policy does.

Attached on more than one side23%
Attached on one side33%
Detached44%
Median building footprint106 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate2.01
Buildings classified395

Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-09-22.

  1. Day 0Measured survey of your Belmont property — or your existing plans if you have them.
  2. About 7 daysDrawings issued for your approval. Free redraws until you are happy.
  3. SubmissionWe validate against London Borough of Sutton’s checklist and submit on your behalf.
  4. Council: 8-week targetHouseholder applications carry an 8-week statutory target. London Borough of Sutton decided 97% of 596 recent householder applications inside it.

Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Neighbourhoods

Streets and neighbourhoods in SM2

Belmontinterwar downland suburb
Nearby

Nearby postcode districts

Sutton SM1Cheam SM3Wallington SM6Morden SM4Carshalton SM5
FAQ

Belmont (SM2) — FAQs

Does the hill affect how deep my Belmont rear extension can be?+
It affects how the height limits are measured and how the extension reads. The permitted depth is taken from the original rear wall, but a floor that sits above the neighbour's garden can raise overlooking and overshadowing concerns, so the height and level of the new floor matter. We survey the levels and draw sections so the design works on your plot.
Do I need planning permission for a loft conversion on a Belmont semi?+
Not necessarily, as a rear dormer on an interwar semi can sit within permitted development when the volume and projection limits are met, and the hipped roof is a point to resolve in the design. We know of no conservation area in Belmont, but we still check the address. If the scheme needs more than the limits allow, we prepare a householder application instead.
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