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Finished white-rendered rear house extension with large glazed doors

Reigate and Banstead, Surrey

Rear extension drawings in Reigate and Banstead

Reigate and Banstead gives rear extensions a depth limit that depends on the type of house, and then tests the result for daylight. Our rear extension drawings in Reigate and Banstead start from £679, and we draw the extension to the limit for your house type before testing the angles.

From £479 drawings + £200 survey (£679 total), no VAT to add

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  • £2m PI insured
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  • Fixed fees, no VAT to add

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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 rear 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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    A limit for each house type

    The council's householder guidance says single-storey rear extensions along a boundary that are deeper than its figures are likely to conflict with its daylight assessments and will not be acceptable. The figures are given by house type and read: 3 m terraced; 3.3 m semi-detached; 3.5 m detached.

    So a terraced house has the shortest limit, a semi-detached house a little more and a detached house the most. Those are the depths along a boundary; further from the boundary an officer may accept more, if the daylight tests are met.

    The national figures are different: a single-storey extension can reach 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey as permitted development. Where the local guide is the tighter measure, a planning application at the local depth can be a surer route than a deeper prior approval.

    Two-storey rear extension under construction on a semi-detached house

    Local figures for Reigate and Banstead

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Single storey rear extensions along a boundary deeper than these are likely to conflict with the daylight assessments and will not be acceptable.3 m terraced; 3.3 m semi-detached; 3.5 m detached—reigate-banstead.gov.uk, Reigate and Banstead Householder Extensions & Alterations SPG (Mar 2004), para 5.2.2, p.15
    Daylight assessed by a 45 degree plan assessment (neighbour to the side) and a 25 degree assessment (neighbour facing the extension).45 degrees; 25 degrees—reigate-banstead.gov.uk, Reigate and Banstead Householder Extensions & Alterations SPG (Mar 2004), section 4.4, p.8-9
    GPDO 2015 Sch 2 Pt 1 Class A, para A.1(f)(i)3 m (attached) / 4 m (detached) beyond the original rear wall, single storey—legislation.gov.uk
    Class A, para A.1(g)6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI—legislation.gov.uk
    Householder: alterations/extensions to a single dwellinghouse, from 1 Apr 2026548 GBP—ribblevalley.gov.uk
    Larger home extension prior approvals granted0 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Larger home extension prior approvals refused13 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Green Belt share of the council area68 % of council area covered by green-belt polygons—planning.data.gov.uk
    Conservation areas21 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries457 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Householder decisions581 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted93.5 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time96.4 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.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.

    Councils bordering Reigate and Banstead
    Single-storey rear extension: the permitted development limitsDepth beyond the original rear wall: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey. Maximum height: 4 m. Within the zone near the boundary: Eaves no higher than 3 m where within 2 m of the curtilage boundary. 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 SSSIABCD

    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

    The daylight angles

    The guide assesses daylight with two angles, recorded as 45 degrees; 25 degrees: a 45-degree plan assessment for a neighbour to the side, and a 25-degree assessment for a neighbour facing the extension.

    We plot both on the drawings. For the second, the section through the neighbour's window shows the line from the sill, so the officer can see that the extension clears it without relying on our description.

    Prior approval in this borough

    A deeper extension can be tried by prior approval: 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI. The council's record is cautious. In the latest national statistics it granted 0 larger home extensions and refused 13.

    The refusals usually turn on neighbour objections, so the application needs the neighbours' windows, boundaries and levels surveyed accurately.

    Green Belt, heritage and decisions

    Green Belt covers 68 per cent of the borough, and there are 21 conservation areas and 457 list entries. In the Green Belt the original footprint is the baseline, so earlier additions count against a new one.

    The council decided 581 householder applications in the latest published year, granted 93.5 per cent and decided 96.4 per cent in time.

    The drawing set and what to read next

    A set shows existing and proposed plans, sections and elevations with the angles plotted. It starts at £679, fixed before you commit, and the council's householder fee is £548, paid to the council.

    See loft conversion drawings in Reigate and Banstead for the roof, HMO conversion drawings in Reigate and Banstead for a proposed shared-house rule, and architectural drawings in Reigate and Banstead for the overview.

    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.
    House extension under construction with scaffolding, new glazed doors and building materials
    Every side considered
    Flick across the turntable to spin it.

    Other services in Reigate and Banstead

    Rear extension drawings nearby

    Questions

    How deep can a single-storey rear extension be in Reigate and Banstead?

    The council's guidance gives limits along a boundary by house type: 3 m terraced; 3.3 m semi-detached; 3.5 m detached.

    How does the council test daylight?

    With two angles: 45 degrees; 25 degrees.

    What does the council charge for a householder application?

    £548, paid to the council.

    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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