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Kensington and Chelsea, London

Electrical design drawings in Kensington and Chelsea

In Kensington and Chelsea the electrics are rarely a simple rewire. Houses are listed or in conservation areas, basements are common, and the council's Local Plan sets firm rules on overheating. We prepare electrical design drawings in Kensington and Chelsea that show every circuit, fitting and plant connection, so your contractor can price the job and the officer can see the design is considered. 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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    Two-storey rear extension under construction on a semi-detached house

    The borough's overheating rule and electrical design drawings in Kensington and Chelsea

    The current Local Plan is unusually direct about heat. The overheating policy applies to All developments: every development must minimise overheating and reduce reliance on air conditioning, following the London Plan cooling hierarchy, and applicants are pointed to the GLA early-stage overheating risk tool and the Mayor's Energy Assessment Guidance. Part O of the Building Regulations then applies to new homes.

    That has a direct effect on electrical design. A room that is drawn with a ceiling-mounted air-conditioning cassette needs a justification, because cooling is the last step in the hierarchy. We therefore draw the lower steps first: shading, ventilation and low-heat lighting, with mechanical cooling circuits shown only where the earlier measures cannot work. Where cooling is accepted, the circuit, isolator and condensate pump supply are all on the sheet.

    The validation list is narrower. Majors only need an Energy Strategy and a Sustainability Statement, which means a typical house extension is below that threshold while a conversion to several flats or a large rebuild is above it. We tell you which side your project is on at the start.

    House extension under construction with scaffolding, new glazed doors and building materials

    Local figures for Kensington and Chelsea

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Local Plan Policy GB5: all developments must minimise overheating risk and reduce reliance on air conditioning following the London Plan cooling hierarchy, demonstrated in an energy strategy/assessment; applicants to use the GLA early-stage overheating risk tool and follow the Mayor's Energy Assessment Guidance (June 2022); Part O of the Building Regulations applies to new homes.All developments—rbkc.gov.uk, RBKC Local Plan 2024 (adopted July 2024), Policy GB5 A (printed p.138); paras 4.52-4.60 (pp.138-139)
    Validation list: Energy Strategy required for major applications (London Plan SI2/SI3, Local Plan CE1; the 2024 Local Plan numbers energy policy GB4); Sustainability Statement for majors; BREEAM certified assessment for non-residential majors.Majors only—rbkc.gov.uk, RBKC Submission Requirements for Planning Applications (10 March 2023), p.13 (row Energy Strategy); Note 33, p.43
    Supplementary planning documentBasements SPD2016rbkc.gov.uk
    Listed building entries1,350 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Conservation areas39 named conservation areas published by the council—planning.data.gov.uk
    Households living in a house17 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Average price, terraced2,429,086 GBP2026-07publicdata.landregistry.gov.uk
    Householder applications granted93.7 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    AD P (2013) paras 3.4, 3.6 and 3.730 days—gov.uk
    AD L Vol 1 (2021 incl 2023) para 6.58, PDF p.60; AD L Vol 1 (2026) paras 5.57 and 5.59, PDF p.65105 lm/W—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 Kensington and Chelsea
    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

    Basements, plant rooms and what they ask of the supply

    The borough's Basements SPD governs the digging, but the finished basement is an electrical project as much as a structural one: a cinema room, pool plant, wine store, gym and staff flat all want separate circuits. Pumped drainage needs a dedicated supply with an alarm, and the pump should be on a circuit the household cannot switch off by accident.

    We draw the plant room as a schedule of loads, because a large basement can ask more of the incoming supply than the house ever did. If the intake needs upgrading, that decision should be made early, with the distribution network operator, not after the walls are boarded. Our drawings show the existing intake, the proposed consumer unit position and a clear route for any new meter tails.

    Heritage and the Kensington and Chelsea housing stock

    The borough holds 1,350 listed building entries, 39 conservation areas and 16 registered parks and gardens. Only 17 per cent of households live in a house, so much of our work is in flats, mansion blocks and the upper floors of stucco terraces.

    The practical result is care over fabric. We mark every chase, floor lifting point and penetration through a listed ceiling, and propose surface-mounted or concealed routes that do not cut cornices or plasterwork. A terraced house here has an average price of £2,429,086, so owners expect the installation to be invisible and the records to be complete.

    On the planning record, 93.7 per cent granted among 664 decisions. Electrical items rarely decide an application, but a visible meter box or external light on a heritage frontage can, and our architectural drawings in Kensington and Chelsea cover the elevation side of that question.

    Planning the supply for a large London house

    A big house in this borough is closer to a small hotel than a family home: several kitchens, staff accommodation, lift or pool plant, security and audiovisual systems. Rather than draw each room in isolation, we start from a single line diagram of the supply, listing every board, its feeder and what hangs from it.

    Doing it that way exposes the awkward questions early. Is there a second riser? Can the existing intake carry a heat pump and two chargers? Where does an emergency supply connect? The answers feed the contractor's price and the energy consultant's model, and they are far cheaper to settle on paper than inside a finished plaster ceiling.

    National rules we work to

    Part P sets 30 days for certifying notifiable work, and the later Approved Document L raises the lighting floor to 105 lumens per circuit watt. Both are built into our schedules. The electrician still tests and certifies; our job is to make sure the design is complete before work begins.

    The sheets join your building regulations drawings in Kensington and Chelsea and the construction drawings the builder works from. The electrical design drawings hub explains the rest of the service, and we run a free constraints check before quoting.

    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.
    Brick house being extended, with a wide new opening supported over the ground floor
    Every layer specified
    Move across to open the layers; move down to pick one.

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    Questions

    Will Kensington and Chelsea accept air conditioning in a house extension?

    Only after the lower steps of the cooling hierarchy have been shown to be insufficient. We draw shading and ventilation first and add cooling circuits only where needed.

    Do I need an Energy Strategy for a house extension?

    The validation list asks for one from Majors only. A typical house extension falls below that, but we check against your scheme.

    Can you draw electrics for a basement plant room?

    Yes. We schedule the loads, show the pump supply and alarm, and mark the intake so any upgrade is planned early.

    How much do electrical design drawings cost in Kensington and Chelsea?

    Fixed quote after a free constraints check.

    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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