Loft extension planning in Charlton
A loft extension in Charlton needs planning permission if it breaks the Class B limits, such as 40 cubic metres on a terraced house and 50 on any other, or if the house is in a conservation area or under an Article 4 direction. Greenwich, the council for SE7, granted 77% of its 624 householder decisions in the latest four quarters. Hip-to-gable drawings start at £745.
Fixed fee from £545 drawings + £200 survey (£745 total) · all prices
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The two numbers that decide it
Under Class B of the permitted development order, a terraced house can add 40 cubic metres of roof space and any other house 50 cubic metres. A hip-to-gable conversion uses part of that allowance when the sloping side roof becomes a vertical wall.
Our guide to loft conversion planning permission shows how to work out the volume you have left.
Greenwich: 624 decisions, 77% granted
Our analysis of the MHCLG planning application statistics (table PS2) shows Greenwich granted 77% of 624 householder decisions in the four quarters to mid-2026, and decided 95% of the non-prior-approval cases within eight weeks.
A grant rate in the seventies is not a reason to avoid applying, but it is a reason to give the drawings real attention. The Greenwich planning permission page covers the route and the council's fee.
Our analysis of table PS1 shows Greenwich decided 859 certificates of lawful development over the eight quarters to mid-2026.
Nearly half of appeals succeeded
Our analysis of the Planning Inspectorate casework database counts 343 householder appeals decided for Greenwich between 2021 and 2026, and 47% were allowed. So a refusal here can be worth challenging.
It is still a history of other people's cases. Appeal outcomes depend on the roof, the street and the neighbours.
Designations in the borough
The national register, as analysed from the MHCLG Planning Data Platform, holds 24 conservation-area entries for Greenwich. A house inside one loses the dormer right. Check the council's map for Charlton, and see our Article 4 guide for the wider rule.
Certificates and our price
Our analysis of table PS1 shows Greenwich decided 859 certificates of lawful development over the eight quarters to mid-2026. A certificate is worth considering if you plan to sell. Hip-to-gable drawings start at £745, with free redraws until approval and drawings in 7 days.
Use our Greenwich floor plans for the room layouts once the roof is settled, or compare roof types on the hip-to-gable hub.
Sources
Every figure on this page, where it comes from and a link to the original.
| Figure | Source | Link |
|---|---|---|
| £745 | DrawingsDirect starting fixed fee for hip-to-gable loft conversion permitted development drawings, from the published price list | drawingsdirect.co.uk |
| 40 cubic metres | GPDO 2015 Sch 2 Pt 1 Class B.1(d)(i): roof additions may add up to 40 cubic metres to the roof space of a terrace house (source wording: "40 cubic metres in the case of a terrace house") | www.legislation.gov.uk |
| 50 cubic metres | GPDO 2015 Sch 2 Pt 1 Class B.1(d)(ii): roof additions may add up to 50 cubic metres to the roof space of any other house (source wording: "50 cubic metres in any other case") | www.legislation.gov.uk |
| 624 | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 77% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 95% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 343 | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 47% | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 24 | Our analysis of MHCLG Planning Data Platform conservation-area and article-4-direction datasets (bulk snapshot retrieved 19 Oct 2026) | www.planning.data.gov.uk |
| 859 | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |