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Bexley, London

Garden room drawings in Bexley

Garden room drawings in Bexley start at £495 including VAT. Bexley grants nearly every householder application it decides, so the work that pays off is a tidy, well-judged set of drawings that shows the officer a modest building in the right place.

From £495 (VAT included)

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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 garden room drawings

    Nine 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.

    8. Building regulations

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

    9. 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

    Garden room drawings in Bexley and the council's Design Guide

    Bexley's householder advice sits in the Design Guide SPD Part 1: Design Principles and its companion, the Design Guide SPD Part 2: Building Alterations and Extensions. Both support the Bexley Local Plan, adopted in 2,023. A garden room is an alteration to the property's setting, so these are the documents an officer opens first.

    We have read the borough's published guidance for outbuildings and it gives no footprint or height figure that we can quote with a page reference, so we do not invent one. Instead we design to the national limits and show that the building stays subordinate to the house, sits to the rear and keeps clear of neighbouring windows.

    That approach is also the one most likely to be accepted anywhere: a modest outbuilding, placed sensibly and drawn clearly, is rarely the problem.

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

    Local figures for Bexley

    Figures with their unit, period and source
    MeasureValuePeriodSource
    Conservation areas23 named conservation areas published by the council—planning.data.gov.uk
    Listed building entries114 list entries (Historic England, within the LPA boundary)—planning.data.gov.uk
    Grade I listed entries6 list entries—planning.data.gov.uk
    Registered parks and gardens4 registered parks and gardens intersecting the LPA boundary (Historic England)—planning.data.gov.uk
    Green Belt share of the council area17 % of council area covered by green-belt polygons—planning.data.gov.uk
    Domestic gardens share of land (GLUD 2005)25.1 % of land that is domestic garden (GLUD 2005)2005data.london.gov.uk
    Householder decisions877 decisions1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications granted94.6 %1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Householder applications decided in time99.4 % decided within 8 weeks or an agreed extended period1 July 2025 - 30 June 2026assets.publishing.service.gov.uk
    Average house price413,343 GBP2026-07publicdata.landregistry.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 Bexley
    Single-storey rear extension: the permitted development limitsDepth beyond the original rear wall: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey. Maximum height: 4 m. Within the zone near the boundary: Eaves no higher than 3 m where within 2 m of the curtilage boundary. Larger extension under prior approval: 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSIABCD

    Single-storey rear extension: the permitted development limits

    The house in section with a rear extension; the dashed lines mark the zone near the boundary.

    A · Depth beyond the original rear wall
    3 m (attached) / 4 m (detached) beyond the original rear wall, single storey
    B · Maximum height
    4 m
    C · Within the zone near the boundary
    Eaves no higher than 3 m where within 2 m of the curtilage boundary
    D · Larger extension under prior approval
    6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI

    A borough that mostly says yes

    In its latest published year Bexley decided 877 householder applications and granted 94.6 per cent, with 99.4 per cent decided in time. A second set of statistics from the government's planning return shows 939 householder decisions, 95.3 per cent granted.

    Those are high grant rates, but they cover every kind of home alteration, and a high figure does not promise a result for a particular room. What it tells us is that the officers are used to routine garden buildings and that most problems are avoidable ones: a missing boundary distance, an unclear use, a tree left off the plan.

    That is why we spend our time on the block plan. Every dimension from the room to each boundary is marked, so the officer can check it in a minute.

    Heritage, Green Belt and where permitted development stops

    Bexley has 23 conservation areas and 114 list entries, including 6 at Grade I, and 4 registered parks and gardens. About 17 per cent of the borough is Green Belt.

    These matter because the national rule is strict about them: Garden buildings within the curtilage of a listed building are not permitted development. In a conservation area there is also this restriction: On article 2(3) land, no outbuilding between a side wall and the boundary.

    Some streets carry more than one designation. We map the address against all of them and tell you at the quote stage whether the room is permitted development or needs an application.

    How much of Bexley is garden

    Domestic gardens account for 25.1 per cent of the borough's land in the government's generalised land use database. A large garden can lead to a bigger building than the rules support.

    The coverage cap is simple to state and easy to breach. Buildings may not cover more than 50% of the curtilage (excluding the original house). A detached garage, a greenhouse and a patio roof all count, so we total what is already there first.

    The average Bexley home sold for £413,343, and prices changed by 2 per cent over the past year. Added working space often costs less than a move.

    Designing for a suburban Bexley plot

    In a suburban garden overlooked from both sides, the position of the room matters more than its style. A building at the far end keeps the garden usable and sits furthest from neighbouring windows. One beside the house is easier to power but closer to the people who might object.

    We draw both options in 3D where the choice is open, with the roof height shown against the fence. Owners often pick the lower roof once they see it on screen, and officers read it the same way.

    A flat or gently pitched roof, timber or fibre cement cladding in a recessive colour and a modest window area are the safest choices in a residential street. A green roof is welcome and shows in the section.

    The route: certificate, application and Building Regulations

    A garden room that meets Class E can be built without an application, and a Lawful Development Certificate in Bexley is the written proof. If it does not, the drawing set is submitted as planning drawings in Bexley, and the fee for works within an existing home's boundary is £272.

    Separately, the Building Regulations can exempt a detached room. The larger exemption reads: Detached single-storey building up to 30 m², no sleeping accommodation, at least 1 m from the boundary or substantially non-combustible, is exempt. Our building regulations drawings in Bexley cover any room that falls outside it.

    A large or habitable building can raise the question of the community infrastructure levy. The borough's charge is £40/m² (Zone 1); £60/m² (Zone 2), plus indexation, and we flag the point early.

    Building control and the electrical side

    A garden room with heating and lighting involves an electrical supply, and that work is usually notifiable under the Building Regulations even when the building itself is exempt. We note the cable route, the consumer unit and the need for a competent electrician on the drawings, so the builder prices it correctly.

    Drainage is the other practical point. A WC needs a foul connection with a proper fall, and a Bexley garden that slopes toward the house can make that awkward. We check the invert levels on the survey before we place the WC.

    Price, checking and nearby boroughs

    The set starts at £495, VAT included. It has the site and block plan, floor plan, elevations, a section and a materials note, and a second chartered technologist checks it before issue. If the council asks for changes we redraw them free of charge.

    For the whole service in the borough, see architectural drawings in Bexley. Next door, owners often compare garden room drawings in Dartford and Greenwich.

    What you receive

    Planning drawing sheet for a rear extension with plans, elevations and sections
    Sample drawing. Planning drawings for a rear extension: plans, elevations and sections on one sheet set.
    Finished white-rendered rear house extension with large glazed doors
    Every side considered
    Flick across the turntable to spin it.

    Questions

    Does Bexley publish a size limit for garden rooms?

    Not one we can quote from its guidance with a page reference. We design to the national permitted development limits and show the room is subordinate to the house.

    How likely is a householder application to be granted in Bexley?

    The council granted 94.6 per cent of householder applications in its latest published year. That is a borough-wide figure for all work and not a promise for any one scheme.

    Is Green Belt a problem for a garden room in Bexley?

    It can be. About 17 per cent of the borough is Green Belt, where outbuildings are judged for their effect on openness. We check the address first.

    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.