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Croydon, London

Building services design in Croydon

Croydon asks even a small residential scheme to explain its clean energy and its outdoor plant. If you are adding a home, converting a house or extending a large one, the services need a written strategy as well as a drawing. We provide building services design for Croydon homes: heating, hot water, ventilation, power and drainage planned as one system. 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 building services 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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    House extension under construction with scaffolding, new glazed doors and building materials

    Croydon's energy documents, for majors and for minor schemes

    Croydon's current Local Validation List separates two energy documents, and records the split as: Majors; Energy Design Statement for all minor residential. The Energy Assessment is the major-scheme document. It asks for net-zero carbon and the London Plan hierarchy, with a carbon offset calculation where the target is missed.

    The part that affects small schemes is the Energy Design Statement. The list asks for it for all minor residential development, to set out the clean energy solutions that will meet the target emission reduction, and to consider the amenity effect of external plant. In practice that means a new dwelling, a conversion into flats or a large infill has to say what heats it and where the equipment sits.

    A BREEAM pre-assessment is a third document, and the list applies it to Majors. For a home that rarely matters, but it shows how the council sorts schemes by size, and it is worth knowing which tier yours falls into before drawings are started.

    The practical advice is to decide the tier first. A single new house on a garden plot sits in the minor tier and needs the statement. A block of flats sits in the major tier and needs the assessment. Getting that wrong costs a validation cycle, so we confirm it with you before we start drawing.

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

    Local figures for Croydon

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Energy Assessment required for Majors, showing net-zero carbon and the London Plan energy hierarchy with any carbon offset calculation; separately an Energy Design Statement is required for all minor residential development setting out clean energy solutions to meet the target emission reduction and amenity impacts of external plant.Majors; Energy Design Statement for all minor residential—croydon.gov.uk, Croydon Local Validation List (May 2026), PDF p.24 (printed 22) 'Energy Assessment'; PDF p.31 (printed 29) 'Energy Design Statement'
    A BREEAM pre-assessment is required for Majors, showing the relevant BREEAM standard or equivalent is met.Majors—croydon.gov.uk, Croydon Local Validation List (May 2026), PDF p.22 (printed 20), 'BREEAM pre-assessment'
    Households living in a house60.2 % of households living in a house or bungalow (detached, semi-detached or terraced)Census 2021nomisweb.co.uk
    Domestic gardens share of land (GLUD 2005)32.8 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Green Belt share of the council area25 % of council area covered by green-belt polygons—planning.data.gov.uk
    Minor applications granted57.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted86.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Conservation areas19 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries180 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    AD L Vol 1 (2026) para 4.10, PDF p.51; 2021 edition para 5.10, PDF p.4655 degC—gov.uk
    AD S (2021) para 6.2, PDF p.357 kW—gov.uk
    AD L Vol 1 (2021 incl 2023) Table 4.1, PDF p.34; 2026 edition Table 3.10.26 W/(m2.K)—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 Croydon
    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

    Writing an energy design statement that matches the drawings

    A weak statement is one that says a heat pump will be used and nothing more. A good one names the heat source, shows the position and size of the outdoor unit, gives the flow temperature the emitters are designed for and explains what the neighbours will hear. The guidance caps a heat pump's design flow temperature at 55 degrees Celsius, so emitters are sized larger than for a boiler.

    We draw the plant on the site plan and the elevations so the statement and the drawings agree. External plant is where officers look for amenity impact: a condenser close to a boundary, a flue near an opening window, a bank of louvres facing a neighbour's garden. We choose the position, test it against the neighbouring windows, and write the paragraph that explains it.

    Electrical provision gets a line too. A new dwelling with parking needs a charge point of at least 7 kW output, so the consumer unit and cable route are sized for it from the start.

    Croydon's houses, gardens and green belt

    About 60.2 per cent of Croydon households live in a house, and domestic gardens cover 32.8 per cent of the land. That combination, with 25 per cent of the borough in green belt, drives a steady supply of infill houses, back-garden plots and house conversions, and each of them has to find space for plant.

    Of the minor applications the council decided in its latest year, only 57.6 per cent were granted, which is a lot lower than the householder figure of 86.6 per cent. Minor schemes have the tougher record, and a missing energy design statement is an easy reason to delay validation.

    Croydon has 19 conservation areas and 180 listed building entries, and it applies an Article 4 direction on houses in multiple occupation. The Conservation Areas General Guidance SPD is relevant to anything visible from the street, including flues and meter boxes.

    What the Croydon package contains

    You receive a services strategy in the form of an energy design statement where one is needed, a heat-loss summary, plant and riser positions drawn into the model, and coordination sheets against the structure. A new dwelling also needs fabric figures, and a new wall is limited to 0.26 W/m²K.

    The set is issued beside our SAP calculations in Croydon and building regulations drawings in Croydon. For layout sheets, see our M&E drawings service, and for the engineering behind the systems, MEP design in Croydon. Wider borough rules are on our page about architectural drawings in Croydon.

    We design and draw. A qualified installer fits and certifies. Send us the plans and we will give a fixed quote after a free constraints check.

    Before we issue anything a second technologist checks that the statement, the plant positions and the fabric figures say the same thing. A mismatch between a text and a plan is one of the quickest ways to draw a validation query, and it is an easy one to prevent.

    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.
    Pencil resting on a dimensioned technical drawing beside a scale rule
    Every layer specified
    Move across to open the layers; move down to pick one.

    Other services in Croydon

    Questions

    Do I need an energy design statement for a Croydon extension?

    The list ties the statement to minor residential development, meaning new homes and conversions. A plain householder extension is normally outside it, but confirm with the council.

    What does the council look at on external plant?

    The amenity effect on neighbours: noise, visual impact and position against windows and boundaries. We draw and justify the position.

    Can you prepare the statement and the drawings together?

    Yes. Writing them together keeps the figures and the positions consistent.

    How is the work priced?

    Fixed quote after a free constraints check, based on the scale of the scheme.

    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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