Dormer loft conversion in Belvedere
A dormer loft conversion in Belvedere, Erith or Welling can often be built without a full application if it adds no more than 40 cubic metres to a terraced house. Where you do apply, Bexley granted 95% of its 877 householder decisions in the latest four quarters. Rear dormer drawings start at £695.
Fixed fee from £495 drawings + £200 survey (£695 total) · all prices
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Rear dormer or L-shaped dormer
A rear dormer is the simplest loft conversion and starts at £695. An L-shaped dormer, which wraps round the back addition of a house, starts at £745.
Both are drawn against the same Class B test: 40 cubic metres on a terraced house, with the roof enlargement set back at least 0.2 metres from the eaves. Our guide to loft conversion types helps you choose between them.
Bexley grants nearly every householder application
Our analysis of the MHCLG planning application statistics (table PS2) shows Bexley granted 95% of 877 householder decisions in the four quarters to mid-2026, counting prior approvals. By the same analysis, and rounded, 100% of householder decisions excluding prior approvals were made within eight weeks.
The figures cover all householder work, not only dormers. Still, a dormer that needs an application, because it faces the road or sits under an Article 4 direction, goes to a council that grants most householder cases. The Bexley planning permission page sets out that route.
Our analysis of the MHCLG Planning Data Platform lists 31 conservation-area entries for Bexley on the national register.
The appeals that did go to the Inspectorate
Our analysis of the Planning Inspectorate casework database counts 157 householder appeals decided for Bexley between 2021 and 2026, with 34% allowed. Appeal figures describe the past and do not predict a decision on your house.
They do suggest that an inspector backs the council more often than not, so a refused dormer is often better redrawn than appealed.
Conservation areas and the certificate alternative
Our analysis of the MHCLG Planning Data Platform lists 31 conservation-area entries for Bexley on the national register. The register may not be complete, so check the council's conservation area map for DA17 before you rely on permitted development.
If your dormer is permitted, a certificate of lawful development proves it. Our analysis of table PS1 counts 586 certificates decided by Bexley over eight quarters, which shows how routine the route is. Our certificate guide explains when one is worth having.
Next to the neighbouring towns
Owners nearby can see our dormer drawings for Bexley and Sidcup. If the roof is hipped, our hip-to-gable drawings for Bexley show the alternative. Drawings come back in 7 days, with free redraws until approval.
Sources
Every figure on this page, where it comes from and a link to the original.
| Figure | Source | Link |
|---|---|---|
| £695 | DrawingsDirect starting fixed fee for rear dormer loft conversion permitted development drawings, from the published price list | drawingsdirect.co.uk |
| £745 | DrawingsDirect starting fixed fee for L-shaped dormer 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 |
| 0.2 metres | GPDO 2015 Sch 2 Pt 1 Class B.2(b): a roof enlargement must be set back not less than 0.2 metres from the eaves, measured along the roof slope (source wording: "not less than 0.2 metres from the eaves") | www.legislation.gov.uk |
| 877 | 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 |
| 100% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 157 | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 34% | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 31 | Our analysis of MHCLG Planning Data Platform conservation-area and article-4-direction datasets (bulk snapshot retrieved 14 Aug 2026) | www.planning.data.gov.uk |
| 586 | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
Questions people ask
Can I build a dormer loft conversion in Erith or Welling without planning permission?
How much does a dormer loft conversion in Belvedere cost to draw?
Does Bexley approve dormer loft conversions?
Photographs: GRALISTAIR (CC BY-SA 4.0); GRALISTAIR (CC BY-SA 4.0); David Hawgood (CC BY-SA 2.0).
