Garden room in Greenwich
Do you need planning permission for a garden room in Greenwich?
Generous gardens in Eltham, Charlton and Blackheath often suit Class E garden rooms under permitted development when height, coverage and incidental-use limits are met. Conservation-area designation and listed curtilage are the constraints. Keep the use incidental.
Generous gardens in Eltham, Charlton and Blackheath suit garden rooms under PD; conservation-area designation and height and incidental-use limits are the constraints.
Deeper suburban plots clear the 50% coverage rule more easily than short yards, provided the 2.5m boundary-height limit is respected. Near heritage cores, design sensitivity rises even when Class E still applies at the rear. Flats never had outbuilding rights.
What actually applies in Greenwich
Conservation areas in Greenwich
Real · planning.data.gov.uk14 designated areas are recorded in the official dataset for this borough without published names. The area report still checks an address against their real boundaries — see the council's own conservation-area and Article 4 pages for the named schedules.
Source: planning.data.gov.uk · Open Government Licence · 14 recorded.
Article 4 directions in Greenwich
Real · planning.data.gov.ukNo Article 4 geometry for Greenwich appears in the national planning.data.gov.uk dataset, but the Royal Borough operates householder Article 4 directions in a number of its conservation areas — among them the Ashburnham Triangle, West Greenwich, East Greenwich, the Rectory Field, the Shrewsbury Park Estate and the Progress Estate — removing permitted development rights so that visible external alterations need planning permission. The Residential Extensions, Basements and Conversions Guidance SPD sets the design rules. 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 Greenwich, 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 Greenwich?
| 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 Greenwich
Roof height within 2m of a boundary and cumulative garden coverage are the usual Class E failures. Listed curtilage removes the route entirely.
Postcode districts in Greenwich
SE10 is the Maritime Greenwich World Heritage core — the Old Royal Naval College, Queen's House and Royal Observatory — wrapped by the West Greenwich, East Greenwich and Ashburnham Triangle conservation areas, several with Article 4 directions.
SE10 — Greenwich & Maritime Greenwich →SE3 covers the Blackheath and Westcombe Park conservation areas around the heath (Blackheath is shared with Lewisham).
SE3 — Blackheath & Westcombe Park →SE7 is Charlton — the Charlton Village conservation area around Charlton House and the Rectory Field, which carries an Article 4 direction.
SE7 — Charlton →SE9 is Eltham — home to the Progress Estate, a celebrated First World War garden suburb with an Article 4 direction, and Eltham Palace nearby.
SE9 — Eltham →SE18 covers Woolwich, the Royal Arsenal riverside and the Shrewsbury Park Estate conservation area (which carries an Article 4 direction) above Plumstead.
SE18 — Woolwich & Plumstead →SE2 covers Abbey Wood and the Thamesmead fringe, mainly in Greenwich with a Bexley edge.
SE2 — Abbey Wood & Thamesmead fringe →SE28 is Thamesmead — later twentieth-century stock and estate layouts in Greenwich (with a Bexley edge), different from the Victorian terrace belts further west.
SE28 — Thamesmead →Garden room in Greenwich, asked straight
Do I need planning permission for a garden room in Greenwich?
How much does a garden room cost?
Do larger gardens help?
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 Greenwich 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 Greenwich 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.