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Waltham Forest, London

Double-storey extension drawings in Waltham Forest

Double-storey extension drawings in Waltham Forest start at £1,295 including VAT. The council's newly adopted Residential Alterations and Retrofit SPD limits a first-floor rear extension, measured from the original rear wall, to 2 m terraced/semi; 3 m detached, and adds set-back and ridge rules for the side. We draw to it from the first sketch.

From £1,295 (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 double-storey 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.

    Request a fixed quote
    House extension under construction with scaffolding, new glazed doors and building materials

    What the new SPD asks of a second storey

    The Residential Alterations and Retrofit SPD sits under the Local Plan Part 1: Shaping the Borough 2020-2035, adopted in 2,024. For a two-storey rear extension the first-floor limits from the original rear wall are 2 m terraced/semi; 3 m detached, the shorter figure for terraced and semi-detached houses and the longer for detached ones. The extension must also stay clear of the 45-degree line in plan.

    Side extensions are covered separately. The first floor is set back from the front building line, the ridge sits lower than the existing ridge, and where gaps between buildings are a feature of the street the extension keeps a clear space from the boundary. The three figures, in that order, are 0.5 m set-back; 0.5 m ridge set-down; 1 m to boundary. The SPD adds two conditions: no separate front door and no extra staircase, which keeps the extension part of one home.

    Each rule appears as a labelled dimension on our sheets, with the page of the SPD it comes from, so you and the case officer can read the same line.

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

    Local figures for Waltham Forest

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Two-storey rear extensions: first floor no more than 2 m from the original rear wall for terraced and semi-detached, 3 m for detached; must not breach the 45-degree line in plan.2 m terraced/semi; 3 m detached—walthamforest.gov.uk, Waltham Forest Residential Alterations and Retrofit SPD (adopted June 2026), p.36, section 7.6
    Two-storey side extensions: set back at least 0.5 m from the main front building line, ridge at least 0.5 m below the existing ridge, no separate front door, no extra staircase; set in at least 1 m from the side boundary where gaps between buildings are characteristic.0.5 m set-back; 0.5 m ridge set-down; 1 m to boundary—walthamforest.gov.uk, Waltham Forest Residential Alterations and Retrofit SPD (adopted June 2026), p.40, section 7.8
    Conservation areas15 named conservation areas published by the council—planning.data.gov.uk
    Green Belt share of the council area22 % of council area covered by green-belt polygons—planning.data.gov.uk
    Listed building entries118 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Article 4 directions15 Article 4 directions published by the council—planning.data.gov.uk
    Householder decisions771 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted81.5 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time90.7 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Larger home extension prior approvals refused87 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    Average price, terraced624,560 GBP2026-07publicdata.landregistry.gov.uk
    Class A, para A.1(h)Over one storey: max 3 m beyond the original rear wall and not within 7 m of the rear boundary—legislation.gov.uk
    Approved Document B Vol 1, 2019 ed. incl. 2026 amendments, para 2.10Escape window: unobstructed openable area at least 0.33 m², at least 450 mm high and 450 mm wide, bottom of opening no more than 1100 mm above floor—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 Waltham Forest

    Householder applications by street in Waltham Forest

    Streets in Waltham Forest with the most householder applications, and the share approved
    StreetApplicationsApproved
    Browning Road2282%
    Blenheim Road1667%
    Ulverston Road1455%
    Capworth Street1364%
    Clacton Road1255%
    St Johns Road1267%
    The Avenue1191%
    Grange Park Road10100%
    Murchison Road1088%
    Oakdale Road1070%
    Sky Peals Road1075%
    Woodberry Way1063%
    Albert Road975%
    Badlis Road989%
    Colchester Road956%
    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). Waltham Forest guidance: 45 degrees (plan and elevation)AB

    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)
    B · Waltham Forest guidance
    45 degrees (plan and elevation)

    Why a new document matters to your drawings

    A recently adopted document has little case history behind it. Officers are applying it for the first time, and a drawing that shows its tests plainly saves everyone a round of questions. We read the text itself, not summaries, and check each dimension against it before issue.

    Earlier decisions can still be useful, but they were reached on other wording. If you have seen a neighbour's extension that looks deeper than the figures above, it may have been approved under earlier guidance or under other rights, so do not use it as a precedent without asking us.

    How Waltham Forest has treated extension applications

    In its latest twelve months Waltham Forest decided 771 householder applications. It granted 81.5 per cent and decided 90.7 per cent in time. Those are good but not extreme numbers, and they hide a split between modest and larger schemes.

    The larger home extension prior approval record shows the split. Over the latest four quarters the council granted 31 and refused 87. Refusals outnumbering grants suggests scrutiny of deep ground floors under the prior approval route, and a combined two-storey application can be the cleaner way to settle the whole design.

    Housing, gardens and constraints

    Around 55.1 per cent of households live in a house or bungalow and 48.9 per cent own their home. Domestic gardens covered 24.4 per cent of the borough's land in the national land-use database. The average terrace sold for £624,560 and the average semi-detached for £804,982.

    Green Belt takes 22 per cent of the borough, where proportionate additions are assessed. The council has 15 conservation areas, 118 listed buildings and 15 Article 4 directions, which can remove permitted development rights, as well as 231 tree preservation orders. In a conservation area: No rear extension of more than one storey under PD on article 2(3) land.

    Windows, fire and the extra load

    Upper side windows follow this permitted development condition, which councils reuse: Upper-floor side windows obscure-glazed and non-opening below 1.7 m above floor. The national limit that most schemes exceed is: Over one storey: max 3 m beyond the original rear wall and not within 7 m of the rear boundary.

    A bedroom over the extension needs an escape window: Escape window: unobstructed openable area at least 0.33 m², at least 450 mm high and 450 mm wide, bottom of opening no more than 1100 mm above floor. The extra floor loads the walls below, so the engineer's design comes through our structural calculations service and into the building regulations drawings.

    Fee, what you receive and neighbouring boroughs

    Our fee is £1,295 including VAT, agreed before work begins, with Waltham Forest's householder fee of £548 paid to the council. You receive plans, elevations, sections and location and block plans, each sheet checked by a second MCIAT chartered technologist, and we redraw free of charge if the council asks for amendments.

    To weigh other shapes, read house extension drawings in Waltham Forest or rear extension drawings in Waltham Forest. The same job nearby is on Redbridge and Hackney, and everything else we draw in the borough is under architectural drawings in Waltham Forest.

    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.
    Finished white-rendered rear house extension with large glazed doors
    Every side considered
    Flick across the turntable to spin it.

    Other services in Waltham Forest

    Double-storey extension drawings nearby

    Questions

    How deep can a first-floor extension be in Waltham Forest?

    The new SPD sets first-floor limits from the original rear wall of 2 m terraced/semi; 3 m detached, the shorter for terraced and semi-detached homes and the longer for detached ones. The 45-degree line must not be breached in plan.

    What does the SPD ask of a two-storey side extension?

    A set-back from the front, a ridge below the existing one and a clear gap from the boundary where gaps are characteristic: 0.5 m set-back; 0.5 m ridge set-down; 1 m to boundary.

    Can I add a separate door or staircase to a side extension?

    The SPD rules out a separate front door and an extra staircase for a two-storey side extension.

    What do double-storey extension drawings cost in Waltham Forest?

    From £1,295 including VAT, fixed up front. The council's householder fee is separate.

    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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