Loft conversion in Hammersmith W6
A loft conversion in Hammersmith W6 starts with one check: whether your street sits in a conservation area, because that decides if you can use permitted development. Drawings for a rear dormer start from £695. Hammersmith and Fulham granted 98% of its householder decisions in the latest four quarters, so a well-drawn scheme has a fair hearing.
Fixed fee from £495 drawings + £200 survey (£695 total) · all prices
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Start with your street, not your roof
W6 sits inside the London Borough of Hammersmith and Fulham. Our analysis of the MHCLG Planning Data Platform conservation-area dataset (bulk snapshot retrieved 14 Aug 2026) counts 47 live conservation-area entries on the national register for the borough. Whether your own street is one of them is a question for the council: check its conservation area map before you spend anything on design.
The answer matters because the permitted development right for loft extensions, Class B, does not apply to a house in a conservation area. In that case the loft goes through a householder planning application, with drawings that show how the new roof sits against its neighbours.
If your street is outside a conservation area
A rear dormer can then be built without an application when it adds no more than 40 cubic metres to the roof space of a terrace house, or 50 cubic metres to any other house. It must also be set back not less than 0.2 metres from the eaves. The full conditions are in Schedule 2, Part 1 of the General Permitted Development Order.
Before building, many owners ask for a lawful development certificate to put the council's confirmation on file. Hammersmith and Fulham decided 166 certificates of lawful development of all kinds across the eight quarters from 2024 Q3 to 2026 Q2, in our analysis of MHCLG table PS1. Our lawful development certificate drawings page explains what the drawings must show.
Hammersmith and Fulham decided 166 certificates of lawful development of all kinds across the eight quarters from 2024 Q3 to 2026 Q2, in our analysis of MHCLG table PS1.
How the council has decided householder cases
In our analysis of MHCLG planning application statistics, table PS2, Hammersmith and Fulham made 506 householder decisions across the four quarters from 2025 Q3 to 2026 Q2, and granted 98% of them. Of the householder applications that were not prior approvals, 87% were decided within 8 weeks.
Appeals tell a more cautious story. In our analysis of the Planning Inspectorate casework database (release 2609), 106 householder appeals in the borough were decided between 2021 and 2026, and 42% were allowed. These are past records for all householder work, not a forecast for a loft, but they show that a refusal is not always the last word.
What we draw for a W6 loft
We prepare existing and proposed plans, a roof section, elevations and the site and location plans, and we can prepare the Building Regulations set for the same loft. Rear dormers start from £695 as a fixed fee, drawn within 7 days, with free redraws until the council or building control is satisfied.
If you are weighing other roof forms, the dormer loft conversion drawings and hip-to-gable pages set out how each is drawn. For the borough's wider planning picture, see our Hammersmith and Fulham floor plans page.
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 |
| 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 |
| 506 | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 98% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 87% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 106 | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 42% | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 47 | 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 |
| 166 | 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
Do I need planning permission for a loft conversion in Hammersmith?
What is the difference between a loft extension and a loft conversion in Hammersmith?
How long does Hammersmith and Fulham take to decide a householder application?
Photographs: David Anstiss (CC BY-SA 2.0); GRALISTAIR (CC BY-SA 4.0); GRALISTAIR (CC BY-SA 4.0).
