Garden room in Bexley
Do you need planning permission for a garden room in Bexley?
Large suburban gardens in Bexleyheath and Sidcup suit Class E garden rooms under permitted development when height, coverage and incidental-use limits are met. Conservation areas are where outbuilding rights tighten. Listed curtilage removes Class E entirely.
Large suburban gardens in Bexleyheath and Sidcup suit garden rooms under PD; conservation areas are where outbuilding rights tighten.
Deep plots make the 50% coverage rule easier to clear than on short terraces, provided the 2.5m boundary-height limit is respected. On conservation streets, verify outbuilding rights before ordering a building. Keep the use incidental.
What actually applies in Bexley
Conservation areas in Bexley
Real · planning.data.gov.ukEvery designated conservation area in Bexley from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Brook Street
- Christ Church
- Crossness
- Erith Riverside
- Erith Road
- Foots Cray
- Halfway Street
- High Beeches
- Iron Mill Lane
- Lesney Park Road
- Longlands Road
- North Cray Village
- Oak Road
- Old Bexley
- Old Forge Way
- Parkhurst
- Red House Lane
- Star Hill
- The Green
- The Hollies
- The Oval
- Willersley Avenue and Braundton Avenue
- Woolwich Road
…plus 8 further designated areas.
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Bexley
Real · planning.data.gov.ukNo Article 4 geometry for Bexley appears in the national planning.data.gov.uk dataset, but the borough has operated a borough-wide HMO Article 4 direction since 24 September 2017, removing the right to convert a house to a small HMO (three to six occupants), plus householder directions in its conservation areas. Check the council's Article 4 pages for the position at a specific address.
Source: planning.data.gov.uk · Open Government Licence. Checked at address level by the area report.
Prices: HM Land Registry UK House Price Index, December 2025 · Open Government Licence.
The planning route — PD or permission?
Permitted development (GPDO Class E) allows outbuildings for purposes incidental to the house: maximum 2.5m height within 2m of a boundary (4m for dual-pitched roofs further in), no more than half the garden covered, nothing forward of the principal elevation, and no sleeping accommodation. Within conservation areas Class E still applies at the rear, but outbuildings at the side are excluded.
The 'incidental use' test matters: an office or gym qualifies; a self-contained annexe or rentable unit does not and needs full permission. Listed buildings lose Class E entirely — any outbuilding in the curtilage of a listed house needs an application. Where you intend to run a business with visitors or convert to sleeping space later, take the planning route up front.
Permitted development limits — garden room
| Maximum height within 2m of a boundary | 2.5m |
| Maximum height further from a boundary | 4m for a dual-pitched roof |
| Garden coverage (all outbuildings and extensions together) | No more than half the garden |
| Position | Nothing forward of the principal elevation |
| Use | Incidental to the house — no sleeping accommodation |
| Conservation areas | Rear only — outbuildings at the side excluded |
| Listed buildings | Class E lost entirely — application required |
Limits summarise the General Permitted Development Order (Schedule 2, Part 1) as it applies in London. In Bexley, a conservation area, Article 4 direction or listed status changes the route — the panels above show what is designated, and the address check confirms what applies at your property.
How much does a garden room cost in Bexley?
| Cost per m² (low — prefabricated) | £2,200 |
| Cost per m² (expected — insulated, serviced) | £3,000 |
| Cost per m² (high — architect-designed, plumbed) | £3,800+ |
| Typical project (9–16m²) | £25,000 – £60,000 |
| Groundworks, power run, network (often quoted separately) | £3,000 – £12,000 |
The honest budget includes the invisible half: foundations, armoured power run, data, and drainage if plumbed. Ranges from real project data; VAT excluded.
Realistic timeline
| Design / specification | 2–6 weeks |
| Lawful Development Certificate (optional, recommended) | 4–8 weeks |
| Full application (listed curtilage, non-incidental use) | 8–12 weeks (8-week statutory target) |
| Groundworks and build | 2–8 weeks |
What catches people out in Bexley
Roof height within 2m of a boundary and cumulative garden coverage are the usual Class E failures.
Postcode districts in Bexley
DA5 is Old Bexley — the historic village conservation area on the Cray, with Hall Place nearby and North Cray Village beyond.
DA5 — Bexley & Old Bexley →DA6 is Bexleyheath — the suburban town centre and the streets towards Danson Park.
DA6 — Bexleyheath →DA7 covers Barnehurst and northern Bexleyheath, near the Red House Lane conservation area around William Morris's Red House.
DA7 — Barnehurst & Bexleyheath →DA8 is Erith — the Erith Riverside and Erith Road conservation areas on the Thames.
DA8 — Erith →DA15 covers Sidcup and Lamorbey, including the Halfway Street conservation area.
DA15 — Sidcup →DA14 covers Sidcup and Foots Cray in Bexley — suburban semis and older village cores.
DA14 — Sidcup & Foots Cray →DA16 is Welling and East Wickham — interwar Bexley stock with a Greenwich edge.
DA16 — Welling & East Wickham →DA17 covers Belvedere and the Erith fringe in Bexley.
DA17 — Belvedere & Erith fringe →DA18 is Erith and Thamesmead East in Bexley — a mix of riverside regeneration, later estate stock and suburban streets.
DA18 — Erith & Thamesmead East →Garden room in Bexley, asked straight
Do I need planning permission for a garden room in Bexley?
How much does a garden room cost?
Do large gardens make approval automatic?
Can I sleep in it?
Should I get a Lawful Development Certificate?
What applies at your address?
Borough-level rules only narrow it down. Enter a Bexley postcode for the live constraint check — conservation area, Article 4 and sold-price comparables, cited to source.
Need it in writing for one address? A planning permission report for a Bexley property — from £59, or surveyor-reviewed from £295.
Planning Permission Checker provides planning and cost intelligence for early feasibility only. It is not legal, planning, valuation, architectural, structural, or surveying advice. All estimates are indicative and must be verified by qualified professionals before purchase, design, planning submission, or construction.
Cost estimates are indicative only — not a quotation. Final price depends on survey, specification, structure, access, party wall matters, VAT, professional fees, and contractor availability.
Planning outcomes are not guaranteed. Local planning authorities make final decisions.