Sutton, London
House extension drawings in Sutton
House extension drawings for a Sutton home start at £695 including VAT. Sutton's own design guide is stricter on rear depth than the national permitted development rules, with a figure for each house type, so the drawings have to be set against the council's numbers from the start.
From £695 (VAT included)
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- £2m PI insured
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- Fixed fees, VAT included
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Sutton's own rules for house extensions
The council's guidance is the Design of Residential Extensions SPD, read with the Sutton Local Plan 2016-2031. It sets rear depth by house type. On a terraced house a rear extension should not project more than 2.7 m, and the eaves or a flat roof kept low. On a semi-detached house the guide allows 3 m (max 3.5 m), kept low if it stands on or near the boundary. A detached house can be considered up to 3.5 m, where there is real distance to the boundaries.
Full-width extensions to terraced houses, mid-terraces especially, may be unacceptable where they harm a neighbour's amenity, and an extension should not take up the whole length of the garden. In practice, a mid-terrace owner in Sutton who wants a deep kitchen needs a design argument as well as a drawing.
Two-storey work has its own tests. A side extension should keep a gap of at least 1 m between its flank wall and the boundary, so the street does not read as a terrace. At first floor the guide asks for a setback of 500 mm / 1.5 m, the larger figure applying above an existing garage or ground-floor extension. For two-storey rear extensions the guide gives a depth and a separation distance, 2.5 m; 14 m: where separation is tight, a deeper extension will normally be refused, particularly on a semi-detached house due south of its neighbour.
Local figures for Sutton
| Measure | Value | Period | Source |
|---|---|---|---|
| Terraced houses: rear extensions should not project more than 2.7 m, no higher than 2.5 m to the eaves or a flat roof. | 2.7 m | — | sutton.gov.uk, Design of Residential Extensions SPD 2006, p.18, para A.1.3 |
| Semi-detached houses: up to 3 m deep, up to a maximum of 3.5 m, limited to 2.5 m to the eaves if on or close to the boundary. | 3 m (max 3.5 m) | — | sutton.gov.uk, Design of Residential Extensions SPD 2006, p.18, para A.1.3 |
| Detached houses: up to 3.5 m can be considered, e.g. with significant distance to boundaries. | 3.5 m | — | sutton.gov.uk, Design of Residential Extensions SPD 2006, p.18, para A.1.3 |
| A gap of at least 1 m should be kept between the flank wall of an extension and the boundary wall (greater if the street is more spacious); visual terracing is not supported. | 1 m | — | sutton.gov.uk, Design of Residential Extensions SPD 2006, p.17, para A.1.2 (applies to side extensions) |
| Green Belt share of the council area | 14 % of council area covered by green-belt polygons | — | planning.data.gov.uk |
| Conservation areas | 8 named conservation areas published by the council | — | planning.data.gov.uk |
| Listed building entries | 209 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| Larger home extension prior approvals granted | 9 decisions | 2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026) | assets.publishing.service.gov.uk |
| Larger home extension prior approvals refused | 35 decisions | 2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026) | assets.publishing.service.gov.uk |
| Householder decisions | 601 decisions | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications granted | 91.8 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications decided in time | 94.8 % decided within 8 weeks or an agreed extended period | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
Householder applications by street in Sutton
| Street | Applications | Approved |
|---|---|---|
| Higher Drive | 35 | 70% |
| Oaks Avenue | 31 | 79% |
| Banstead Road South | 30 | 90% |
| The Gallop | 28 | 93% |
| Ridge Road | 26 | 80% |
| Foresters Drive | 23 | 91% |
| Pine Ridge | 23 | 85% |
| Pine Walk | 23 | 83% |
| Boundary Road | 22 | 76% |
| Caldbeck Avenue | 22 | 73% |
| Cornwall Road | 22 | 82% |
| Carshalton Park Road | 21 | 71% |
| Kingsmead Avenue | 21 | 90% |
| Alington Grove | 20 | 95% |
| Chiltern Road | 20 | 90% |
Single-storey rear extension: the permitted development limits
The house in section with a rear extension; the dashed lines mark the zone near the boundary.
- A · Depth beyond the original rear wall
- 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey
- B · Maximum height
- 4 m
- C · Within the zone near the boundary
- Eaves no higher than 3 m where within 2 m of the curtilage boundary
- D · Larger extension under prior approval
- 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI
Gardens, Green Belt and heritage in Sutton
Sutton is a garden borough: domestic gardens cover about 34.5 per cent of its land in the national land-use data. That gives room to extend, and it is also why the council guards rear amenity.
14 per cent of the borough is Green Belt, where extensions face tighter limits, and the borough has 8 conservation areas and 209 list entries. A listed or Green Belt house needs a different approach, so we check the address first.
Prior approval is a harder route in Sutton
A single-storey rear extension can be permitted development within these limits: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey. Beyond that, the larger home extension route lets you go to 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI, if the council does not object after neighbours are consulted.
In Sutton's latest published year the council granted 9 and refused 35 of those applications. That is far more refusals than approvals, so a deep extension often does better as a full householder application than as a prior approval. We explain the choice before you pay for either; our planning drawings in Sutton cover the application route.
How Sutton decides householder applications
Sutton decided 601 householder applications in its latest published year, granting 91.8 per cent and deciding 94.8 per cent within eight weeks or an agreed extension. These figures cover every type of householder project. We use them to plan timing, not to forecast a decision.
What a Sutton extension set includes
You receive existing and proposed plans, every elevation, a section through the extension and the location and block plans, with depth, eaves height and any setback dimensioned so the council can check them against its guide. Prices start at £695 including VAT. A second chartered technologist checks each set, and if the council asks for changes we redraw them free until approval.
Our building regulations drawings in Sutton follow once the design is agreed. Sutton's CIL rate is £100/m² (Residential, borough-wide), and residential extensions can usually claim an exemption: Residential extensions and annexes can claim exemption (claim before commencement).
More extension types and councils nearby
Looking at one shape only? See rear extension drawings in Sutton or double-storey extension drawings in Sutton. For the borough as a whole, start at architectural drawings in Sutton. Neighbouring guidance differs, so compare house extension drawings in Merton and in Croydon.
What you receive
Related pages
Other services in Sutton
House extension drawings nearby
Questions
How deep can I extend a terraced house in Sutton?
Sutton's Design of Residential Extensions guide says a terraced rear extension should not project more than 2.7 m. Semi-detached and detached houses have larger figures.
Can I build a two-storey side extension in Sutton?
Often, with limits. Sutton asks for a gap of at least 1 m to the boundary and a first-floor setback of 500 mm / 1.5 m.
Is prior approval worth trying in Sutton?
Sutton refused 35 larger home extension applications and granted 9 in its latest year, so it is worth taking advice first.
How much do house extension drawings cost in Sutton?
From £695 including VAT, fixed up front. The council application fee is separate.
Sources and dates
- sutton.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- sutton.gov.uk, retrieved
- sutton.gov.uk, retrieved
- data.london.gov.uk, retrieved
- legislation.gov.uk, retrieved
- drive.google.com, retrieved
- legislation.gov.uk, retrieved
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.
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