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City of London, London

Electrical design drawings in the City of London

Electrical design drawings in the City of London are mostly for flats: a Barbican apartment, a converted warehouse, a flat above a shop. The Square Mile has 4,914 households and only 2 per cent of them live in houses, so the usual suburban extension rarely applies. Fixed quote after a free constraints check.

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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 electrical design drawings

    Four 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. Building regulations

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

    4. 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

    What the City of London asks of electrical and energy design

    The City's planning application requirements put energy paperwork on major applications. The Energy Statement entry in our data reads "major applications; GLA energy assessment guidance" and the Sustainability Statement entry reads "BREEAM pre-assessment; major applications". The list still names the Code for Sustainable Homes, which is withdrawn nationally, so BREEAM is the live option. None of these applies to a flat refurbishment, but they matter when a residential block is being converted or rebuilt.

    The two London Plan rules apply here as elsewhere: water use at "105 l/p/d (+ up to 5 l external)", and the cooling hierarchy, summarised as "cooling hierarchy, 6 steps". The hierarchy is a useful check in a dense centre, where overheating can be a real risk to a flat.

    For an individual apartment the electrics therefore concern three things: where the supply enters and who owns the riser, how ventilation and any local cooling are powered, and how new lighting and sockets meet the freeholder's rules. We draw the circuits to suit and annotate the interfaces with the building.

    Pencil resting on a dimensioned technical drawing beside a scale rule

    Local figures for City of London

    Figures with their unit, period and source
    MeasureValuePeriodSource
    London Plan Policy SI 5C(1): development proposals should, through planning conditions, limit mains water use to the Building Regulations optional requirement, 105 litres or less per head per day for residential development, excluding an allowance of up to 5 litres for external use. Applies in every London borough.105 l/p/d (+ up to 5 l external)—london.gov.uk, The London Plan 2021 (GLA, March 2021), p.356, Policy SI 5 part C(1)
    London Plan Policy SI 4B: major development must show through an energy strategy how internal overheating and reliance on air conditioning are reduced, following the six-step cooling hierarchy (reduce heat entering; minimise internal heat generation; manage heat with thermal mass; passive ventilation; mechanical ventilation; active cooling). Para 9.4.1 says the principles can also be applied to minor development.cooling hierarchy, 6 steps—london.gov.uk, The London Plan 2021 (GLA, March 2021), p.354, Policy SI 4 part B and para 9.4.1
    Major applications may need an Energy Statement showing predicted energy demand, CO2 savings and the degree to which energy-efficiency and emissions targets are met, following the GLA guidance on preparing energy assessments.major applications; GLA energy assessment guidance—cityoflondon.gov.uk, City of London: Planning application requirements, Major applications (page updated 9 June 2025), web page, 'Energy Statement' item
    Major applications may need a Sustainability Statement covering sustainable design and construction for demolition, construction and long-term management, including a BREEAM or Code for Sustainable Homes pre-assessment (the Code is withdrawn nationally).BREEAM pre-assessment; major applications—cityoflondon.gov.uk, City of London: Planning application requirements, Major applications (page updated 9 June 2025), web page, 'Sustainability Statement' item
    Households4,914Census 2021 (21 March 2021)nomisweb.co.uk
    Households living in a house2 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Listed building entries637 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Conservation areas28 named conservation areas published by the council—planning.data.gov.uk
    Population15,631mid-2025nomisweb.co.uk
    AD P (2013) paras 3.4, 3.6 and 3.730 days—gov.uk
    AD S (2021) para 6.2, PDF p.357 kW—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 City of London
    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

    Electrical design drawings in the City of London: the Barbican and listed estates

    The City has 637 listed building entries, 445 of them Grade II, and 28 conservation areas. The planning document that governs the best-known housing is the "Barbican Estate Listed Building Management Guidelines: Volume I Introduction and Volume II Residential (SPD)". Under it, changes to flats on the estate are managed with unusual care.

    For electrics, that means keeping new fittings and visible cable out of areas the guidelines treat as original, and using surface or void routes where chasing would damage fabric. We draw to that, and where a decision is a judgement, we say so on the sheet. We do not interpret the guidelines on the council's behalf.

    A residential population of its own

    The City has a resident population of 15,631, living in 4,914 households, and only 36.5 per cent are owner-occupied. The latest figures record 1 householder decision in total, so the planning process for ordinary alterations here is rare; most work is internal and needs no planning at all.

    That does not remove the need for a plan. Leasehold flats usually need landlord consent, which typically asks for a drawing, and an electrician working in a managed building needs the same detail as any contractor. Building regulations drawings in the City of London can carry the electrical sheets to building control when the work is notifiable.

    Costs, certificates and charge points

    Part P applies to notifiable work, and the certificate must be issued within 30 days of completion. A charge point on a new dwelling is specified at a nominal output of at least 7 kW, but a flat without private space cannot host one, so the drawing says where a shared installation is the only option.

    The electrical design drawings hub lists the national rules, including the lighting efficacy figures.

    What a managed building adds to the brief

    A flat in a managed block is not a free-standing house. The supply arrives through a riser you do not own, the meter and cut-out sit in a space the freeholder controls, and a contractor usually has to follow building rules on working hours, protection of common areas and approval of method.

    We draw with that in mind. The existing board and its supply are marked, any proposed change to the incoming cable is flagged for the managing agent, and new circuits are shown running only within the demise of the flat. Fire stopping where a cable passes through a compartment wall is noted for the installer.

    The aim is a drawing that satisfies the freeholder's surveyor on the first read. Nothing in it replaces the lease or the landlord's consent, and we say so on the sheet.

    Lighting in these flats is often deep-plan, with few windows, so we pay attention to circuit zoning, dimmer control and emergency lighting links. Sockets are placed against furniture layouts you supply, not by rule of thumb, and data points for home working are shown alongside the power plan.

    Starting a City job

    Send the flat plan, the lease contact and any freeholder rules. We confirm the requirements and quote a fixed price. Nearby, electrical design drawings in Islington cover the borough to the north.

    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.
    Two-storey rear extension under construction on a semi-detached house
    Every layer specified
    Move across to open the layers; move down to pick one.

    Other services in City of London

    Electrical design drawings nearby

    Questions

    Do City of London flats need planning permission for rewiring?

    Rarely. Internal electrical work does not normally need planning permission, though a listed building or lease may add consent steps.

    Is the Barbican treated differently?

    Yes. The estate has its own listed building management guidelines, and changes to flats are controlled more tightly than in an ordinary block.

    Does the City ask for a BREEAM pre-assessment?

    On major applications it may. A single flat is not a major application.

    How long is the Part P certificate window?

    30 days from completion, issued by the installer or building control body.

    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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