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Lewisham, London

Flat conversion drawings in Lewisham

Lewisham adopted a new Local Plan in 2,025, and it publishes 57 Article 4 directions that can change what a conversion is allowed to touch. We prepare flat conversion drawings in Lewisham from £1,195 including VAT, as MCIAT chartered architectural technologists, with the directions and the levy zone checked on your address first.

From £1,195 (VAT included)

  • MCIAT chartered
  • £2m PI insured
  • LABC Partnered
  • Fixed fees, VAT included

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We use it to check conservation areas and constraints.
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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 flat conversion drawings

    Seven 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.

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

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    Pencil resting on a dimensioned technical drawing beside a scale rule

    What the Lewisham Local Plan and its guidance mean for a conversion

    The development plan is the Lewisham Local Plan 2020-2040. It is a recent plan, so we read its policies directly and not through older precedent. Alongside it sit two supplementary documents that matter to a house-to-flats scheme: the Alterations and Extensions SPD for outward changes, and the Small Sites SPD, which applies to modest plots.

    Lewisham does not publish a single floor-area threshold for conversions that we can quote as a figure, so we do not invent one. The officer instead reads the scheme against the plan's housing policies, the national space standard and the London Plan. Our drawings answer each of those with a schedule of areas, a stacking diagram and an amenity plan.

    Where a conversion needs a new door, a bin store or a window change, the alterations guidance decides how it should look from the street. We draw the front elevation as existing and proposed, so the change is visible in one view. Our flat conversion drawings guide lists the rest of the set.

    Rear view of brick terraced houses in London with slate roofs and chimney stacks along the shared roofline

    Local figures for Lewisham

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Article 4 directions57 Article 4 directions published by the council—planning.data.gov.uk
    Minor application decisions534 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Minor applications granted83.7 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Minor applications decided in time94.8 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted89.4 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Conservation areas30 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries367 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    worldHeritageSites1 World Heritage Sites intersecting the LPA boundary—planning.data.gov.uk
    Mayoral CIL charging band2 MCIL2 charging band (1-3)—london.gov.uk
    Mayoral CIL rate (indexed)72.73 £/m² (indexed, permissions granted in 2026)—london.gov.uk
    Borough CIL residential rate£154.44/m² (Zone 1, Use Class C3); £108.1/m² (Zone 2, Use Class C3)indexed rate 1 Jan to 31 Dec 2026lewisham.gov.uk
    Change of use of a building to one or more separate dwellinghouses, not more than 10: per dwellinghouse, from 1 Apr 2026610 GBP per dwelling—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 Lewisham
    Building regulations, layer by layerPart A: structure: Approved Document A: Structure, 2004 edition incorporating 2004, 2010 and 2013 amendments. Part B: fire safety: All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604. Part L: insulation: New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. Part K: stairs: 2.0 m clear headroom over stairs. Full plans application: Building control body must decide a full plans application within 5 weeks, or longer if agreed in writingPart A: structurePart B: fire safetyPart L: insulationPart K: stairsFull plans applicationABCDE

    Building regulations, layer by layer

    The Approved Documents that shape most house projects, from structure to the application itself.

    A · Part A: structure
    Approved Document A: Structure, 2004 edition incorporating 2004, 2010 and 2013 amendments
    B · Part B: fire safety
    All dwellings: fire detection and alarm system minimum Grade D2 Category LD3 (BS 5839-6), mains-operated smoke alarms to BS EN 14604
    C · Part L: insulation
    New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4
    D · Part K: stairs
    2.0 m clear headroom over stairs
    E · Full plans application
    Building control body must decide a full plans application within 5 weeks, or longer if agreed in writing

    The Article 4 directions and what they can remove

    An Article 4 direction withdraws a permitted development right in a defined area. Lewisham has 57, together with 30 conservation areas and 367 listed building entries. The borough also contains 1 World Heritage Site.

    A conversion into flats always needs planning permission, so a direction does not block it. What a direction can do is take away the rights you would otherwise use for the supporting works: a replacement front door, a new window to a bedroom, a porch or a front-garden bin store. In the wrong place, each of those becomes its own application.

    We map your address against the directions before design starts, and we list any supporting works that would need consent. That way the permission you seek covers the whole conversion, not only the layout.

    Decisions on smaller schemes in Lewisham

    Two or three flats count as a minor application. Over the latest twelve months Lewisham decided 534 of them and granted 83.7 per cent, with 94.8 per cent decided in eight weeks or an agreed extension.

    On householder work the council decided 578 cases and granted 89.4 per cent. The minor grant rate is the lower of the two, which is why a conversion needs fuller evidence than an extension. Because the plan dates from 2,025, decisions on your road made under the earlier plan are a weaker guide, so we give recent ones more weight when we read the register.

    42.2 per cent of households live in a house or bungalow and 41.9 per cent are owner-occupiers, which tells you that houses are common enough for the council to see many conversion proposals and expect consistent evidence.

    Levy, fee and the value of a split

    The Mayor's levy is in band 2, with an indexed rate of £72.73 per square metre this year. The council has its own levy with two zones for homes, shown in the table, and the exemption for small additions does not apply where a new dwelling is created.

    The planning fee is £610 for each flat. A terraced house averages about £602,116, a flat about £376,322, and the twelve-month price change is 0.7 per cent.

    The Lewisham area page lists the borough's constraints.

    What we supply

    Each flat is also tested for height and sound. The London Plan asks for 2.5 m floor-to-ceiling across most of the flat, and the sound targets between flats mean the floor build-up has to be drawn with its depth, which can take headroom from a low ground floor. We resolve both on the section drawings before the layout is fixed. The set contains existing and proposed floor plans, elevations, sections, a block plan and a schedule of areas by flat. Once consent is in place, building regulations drawings follow. Next door, flat conversion drawings in Greenwich show how a neighbouring borough compares.

    What you receive

    Building regulations section drawing showing the construction build-up
    Sample drawing. Building regulations section showing construction build-up for a building control check.
    Upper floors of a large yellow-brick Victorian house in London with chimney pots
    Unit by unit
    Move up and down — the nearest units slide out.

    Questions

    Does an Article 4 direction stop a flat conversion in Lewisham?

    No. A conversion needs planning permission anyway. A direction can remove the rights for supporting works such as a new door or window.

    Which guidance does Lewisham use for alterations?

    The Alterations and Extensions SPD, with the Small Sites SPD for modest plots.

    What does the levy depend on in Lewisham?

    The Mayor's levy depends on the charging band, and the borough levy on which of its two zones the house is in.

    What is the planning fee?

    It is £610 for each flat created, 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.