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Sutton, London

Side return extension drawings in Sutton

Sutton is a suburban borough where 62.9 per cent of households live in a house, and gardens cover 34.5 per cent of the land, so there is usually room beside the house to build into. We draw side return extensions in Sutton from £745 including VAT, after a free check of your address.

From £745 (VAT included)

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  • Fixed fees, VAT included

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    Architectural model of a four-storey London stucco townhouse in its terrace, with a portico, area railings, sash windows, a cornice and chimney stacks
    The house as it stands: four storeys over a lower ground floor.Existing Proposed worksAn illustrative model, built for this page.

    How we work on side return extension drawings

    Nine steps from first call to approval.

    The same model cut through the middle: every floor, the stair, the chimney breasts, the new mansard, rear extension and basement in section
    Section through the model: every floor on one datum.

    1. Enquiry and constraints check

      We check the property against conservation areas, listed status, Article 4 directions, tree preservation orders, flood zone and planning history. We choose the right route and send a fixed quote.

    2. Measured survey

      We survey the house on one datum: rooms, levels, boundaries, drains, trees and the neighbours' windows that the 45° and 25° tests depend on.

    3. Design options

      We model the house in Revit and show you options in 3D and plan, with the planning strategy and the precedents in your street.

    4. Design frozen

      You choose an option in writing. Nothing changes after this without your say.

    5. Independent check

      A second chartered technologist checks every sheet against the council's validation checklist and the policy. A senior review signs it off before anything is submitted.

    6. Submission

      We prepare the forms, certificates, fee and documents and submit through the Planning Portal.

    7. Officer liaison

      We answer the planning officer and make any amendments within five working days, at no charge until approval.

    8. Building regulations

      Technical drawings are coordinated with the structural engineer's calculations, the drainage and the planning conditions.

    9. Approval and hand-over

      Building control approval, then a next-steps pack covering the commencement notice, party wall timing and CIL.

    Free redraws until approval. Every drawing set is checked independently, and the checker is never the person who drew it.

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    Brick house being extended, with a wide new opening supported over the ground floor

    How Sutton's extension guidance shapes a side return

    Sutton's own document for this is the Design of Residential Extensions SPD, which the council still applies alongside the Sutton Local Plan 2016-2031. The council has not published a numeric side return limit that we can quote with a page reference, so we use the guide as the benchmark and design for the usual tests an officer applies: an extension that reads as part of the house, keeps to the existing building line and leaves the neighbours their light.

    Those tests suit the borough's housing. In suburban streets such as those in Cheam, Wallington and Carshalton, the side passage beside a semi-detached house can be wider than a Victorian terrace's and the question is less about squeezing a kitchen wider and more about how a new side wall meets a pitched roof.

    That makes elevations the most important sheet. We draw the front and side views to show how the new wall steps back, how the roof ties into the old one and which bricks match, so the officer can compare the proposal against the guide without a site visit.

    Finished white-rendered rear house extension with large glazed doors

    Local figures for Sutton

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Households living in a house62.9 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Domestic gardens share of land (GLUD 2005)34.5 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Conservation areas8 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries209 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Heritage at Risk entries7 Heritage at Risk Register entries within the LPA boundary (Historic England)—planning.data.gov.uk
    Householder decisions601 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted91.8 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time94.8 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Larger home extension prior approvals granted9 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Larger home extension prior approvals refused35 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Average price, terraced464,085 GBP2026-07publicdata.landregistry.gov.uk
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBP—ribblevalley.gov.uk

    A blank value means the figure has not been published, not that there are none. Check your own address with the council.

    Councils bordering Sutton

    Householder applications by street in Sutton

    Streets in Sutton with the most householder applications, and the share approved
    StreetApplicationsApproved
    Higher Drive3570%
    Oaks Avenue3179%
    Banstead Road South3090%
    The Gallop2893%
    Ridge Road2680%
    Foresters Drive2391%
    Pine Ridge2385%
    Pine Walk2383%
    Boundary Road2276%
    Caldbeck Avenue2273%
    Cornwall Road2282%
    Carshalton Park Road2171%
    Kingsmead Avenue2190%
    Alington Grove2095%
    Chiltern Road2090%
    Counts of householder applications by street; no individual applications are shown. Streets with fewer than five applications are left out.Source: GLA Planning London Datahub, householder applications, all years held. Contains public sector information licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026.
    The 45-degree test in planTest used in daylight assessments: 45 degrees (plan and elevation)A

    The 45-degree test in plan

    A line from the middle of the neighbour's nearest window: the extension should stay behind it.

    A · Test used in daylight assessments
    45 degrees (plan and elevation)

    Conservation areas and listed buildings in Sutton

    The council publishes 8 conservation areas, and Historic England lists 209 buildings in the borough, with 7 entries on the Heritage at Risk Register. That is a smaller heritage footprint than inner London, so many Sutton side returns are not in a protected area.

    Where they are not, the national limit applies: Side extension: single storey, max 4 m high, max half the width of the original house. Eaves matter near the boundary: Eaves no higher than 3 m where within 2 m of the curtilage boundary. Inside a conservation area the position is different: No side extensions under PD on article 2(3) land (conservation areas etc.).

    A permitted development extension can be confirmed in writing, and our lawful development certificate service does exactly that. It is worth having if you expect to sell, because a buyer's solicitor will ask for proof.

    What Sutton's planning figures show

    The council decided 601 householder applications in the latest twelve months of published figures. It granted 91.8 per cent and decided 94.8 per cent within eight weeks or an agreed extension. Householder cases are a routine business here.

    The neighbour-consultation route for large rear extensions tells a harder story: 9 granted against 35 refused. When a side return forms part of a bigger rear scheme, those refusals argue for a full application with proper drawings rather than a quick prior approval.

    None of this predicts your result. The figures describe the whole borough and every kind of household job.

    Ownership, prices and charges

    64.4 per cent of households own their home, and a terraced house averaged £464,085 in the latest Land Registry figures. Owners who plan to stay tend to extend instead of moving, and a side return adds space without leaving the street.

    Sutton's levy is straightforward: £100/m² (Residential, borough-wide). The council's application fee for a householder extension is £548.

    Glass, party walls and the drawing package

    The simple energy route limits openings: Windows, roof windows, rooflights and doors in an extension should not exceed 25% of the extension floor area plus the area of openings removed or covered. A glazed roof can push past it, and then a calculation is needed. Our SAP calculations service handles that.

    On a semi-detached house the boundary wall may be shared or may be your own fence line. Where you build a new wall up to the neighbour's land, notice is needed: Line-of-junction (new wall) notice at least 1 month before work. Our party wall notices service prepares it from the sheets.

    Side return extension drawings in Sutton start at £745 including VAT, covering plans, elevations, sections, location plan and block plan, with a second chartered technologist checking each sheet.

    Related pages for Sutton

    Our overview of the borough is architectural drawings in Sutton. For a larger scheme, compare wraparound extension drawings in Sutton and rear extension drawings in Sutton.

    For comparison with neighbouring councils, see side return extension drawings in Croydon, Merton and Kingston upon Thames. The national rules are on the side return extension drawings page.

    What you receive

    Planning drawing sheet for a rear extension with plans, elevations and sections
    Sample drawing. Planning drawings for a rear extension: plans, elevations and sections on one sheet set.
    Two-storey rear extension under construction on a semi-detached house
    Every side considered
    Flick across the turntable to spin it.

    Other services in Sutton

    Side return extension drawings nearby

    Questions

    Which Sutton guidance covers a side return extension?

    The Design of Residential Extensions SPD, together with the Sutton Local Plan 2016-2031. We draw each sheet to meet both.

    Does Sutton have many conservation areas?

    It has 8. A side return outside them may fall under permitted development, which we confirm from the address.

    How much do side return extension drawings cost in Sutton?

    From £745 including VAT. The council's fee for a householder application is £548.

    Can I prove a side return is permitted development?

    Yes. A lawful development certificate confirms it in writing, which helps when you sell.

    Sources and dates

    City of London skyline glowing at dusk across the Thames under a dramatic orange sky

    Tell us about your property.

    We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.

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