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Bromley, London

MEP design in Bromley

MEP design in Bromley deals with a borough of houses and open land: 68.6 per cent of households live in a house, and 51 per cent of the borough is green belt. We plan the heating, ventilation, power and water so that a bigger home is also an efficient one. Fixed quote after a free constraints check.

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 mep design

    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

    Bromley's energy strategy requirement and the London Plan behind it

    Bromley's validation guidance and list of requirements includes an energy strategy for major development. Its test is that the strategy must show how internal overheating and reliance on air conditioning are reduced, following the London Plan hierarchy, which the council records as: majors; SI 4B.

    That hierarchy has a fixed order, summarised by the plan as cooling hierarchy, 6 steps. It starts with keeping heat out through orientation, glazing and insulation, moves through thermal mass and natural ventilation, and reaches mechanical cooling last. A large Bromley house with a glazed rear extension is a typical case for applying it voluntarily, even though the formal duty is for major schemes.

    The London Plan's water policy adds a second figure that bears on the services. It asks for planning conditions limiting mains water use in homes to 105 l/p/d (+ up to 5 l external). The national default under the Building Regulations is 125 litres per person per day, and the optional tighter standard is 110.

    Because those are different thresholds, we ask at the first call whether the scheme is likely to meet a condition. A large house with several bathrooms has more outlets to budget for, and the fittings are chosen to stay inside the budget.

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

    Local figures for Bromley

    Figures with their unit, period and source
    MeasureValuePeriodSource
    The energy strategy for major development must show how internal overheating and reliance on air conditioning are reduced following the SI 4B cooling hierarchy.majors; SI 4B—bromley.gov.uk, Bromley Validation Guidance and List of Requirements - Planning Applications (agreed 12 December 2024), p.28, 'Energy Strategy'
    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
    Households living in a house68.6 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Green Belt share of the council area51 % of council area covered by green-belt polygons—planning.data.gov.uk
    Listed building entries412 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Householder applications granted78.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder appeals allowed37.6 % of householder appeals alloweddecision dates 1 Jul 2021 to 30 Jun 2026assets.publishing.service.gov.uk
    Larger home extension prior approvals refused15 decisions2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026)assets.publishing.service.gov.uk
    AD F Vol 1 (2021) para 1.24 and Table 1.3, PDF p.18; 2026 edition para 1.20 and Table 1.3, PDF p.1743 l/s—gov.uk
    AD L Vol 1 (2026) para 5.73(a) and equation 5.1, PDF p.6740—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 Bromley
    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

    MEP design in Bromley: large houses, bigger plant

    Bromley has 135,827 households and 68.5 per cent of them own their home. The average detached house sold for £1,067,151 in the latest Land Registry data, and the average semi-detached for £652,925. At those values owners expect quiet, comfortable systems.

    Bigger houses mean longer pipe runs and more rooms, and the ventilation rate rises with every bedroom. The guidance sets 43 litres per second for a five-bedroom home, with 6 more for each bedroom beyond. We choose a central heat recovery unit or several smaller fans according to the plan shape.

    Hot water is the other place where size matters. A cylinder that serves four bathrooms has to refill quickly, and a long run to a far bedroom wastes water while the tap runs warm. We locate the cylinder close to the largest demand, specify a recirculation loop where the distance justifies one and leave a service space beside it that an engineer can reach without moving furniture.

    Under the next edition of Approved Document L, the notional new dwelling has solar panels sized at 40 per cent of ground floor area. A Bromley replacement dwelling with a generous roof is well suited to that, and the electrical design includes the inverter, isolators and a battery position if the owner wants one.

    Green belt, listed houses and plant positions

    Green belt covers 51 per cent of the borough, and the council records 412 listed entries, 47 conservation areas and 108 Article 4 directions. In those places external plant, flues and solar panels are judged on appearance.

    We therefore place heat pumps and condensers behind existing outbuildings, hedges or levels where we can, and draw the pipe routes so they stay clear of tree roots. A well-chosen position shortens the pipe run too, which helps the system perform.

    For a listed house the services design records which routes use existing voids and which cut into historic fabric. A reversible, surface-mounted route is often better than a new chase through an old wall, and the drawing says which is proposed.

    Decisions, appeals and how complete drawings help

    Bromley decided 1,609 householder applications in the latest twelve months published and granted 78.6 per cent, deciding 89.1 per cent in time. Not every case is granted, so the drawings need to be right the first time.

    Planning Inspectorate figures show 502 householder appeals decided for the borough over recent years, with 37.6 per cent allowed. That tells owners an appeal is a real option. The services design rarely decides an appeal, but plant positions and flues on elevations can feature in the case officer's reasons.

    Prior approval for larger home extensions was granted in 3 cases and refused in 15. Bromley also decided 512 lawful development certificate applications, so permitted development is clearly widely tested.

    Our services and nearby boroughs

    Our building services design page covers the wider package, and our M&E drawings service produces the installer's sheets. For power, see our electrical design drawings page.

    Croydon, Bexley and Lewisham border Bromley, as does Sevenoaks in Kent. See architectural drawings in Croydon and architectural drawings in Sevenoaks for the neighbouring planning picture.

    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.

    Other services in Bromley

    MEP design nearby

    Questions

    Does Bromley require an energy strategy?

    The validation guidance asks for one for: majors; SI 4B. Smaller schemes do not need it, though the same cooling hierarchy is good practice.

    What is the London Plan limit on water use in new homes?

    It limits mains water through planning conditions to 105 l/p/d (+ up to 5 l external).

    How much ventilation does a five-bedroom house need?

    The guidance gives a whole-dwelling rate of 43 litres per second for five bedrooms, with a minimum per square metre of floor that also applies.

    How much does MEP design cost in Bromley?

    Fixed quote after a free constraints check. We price after seeing the house, the plans and the systems you want.

    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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