Dormer loft conversion drawings in Wallington
A loft conversion in Wallington starts with drawings, and for a rear dormer our fixed fee starts at £695 with no VAT to add. Whether the dormer needs a planning application or can go ahead as permitted development depends on its size, its position on the roof and your street, so the drawings are what settle it.
Fixed fee from £495 drawings + £200 survey (£695 total) · all prices
Prefer to talk it through?
What the drawings for a Wallington dormer cost
Our starting fixed fee for a rear dormer loft conversion, drawn to permitted development rules, is £695 with no VAT to add. If your plan is an L-shaped dormer that wraps round the back and side of the roof, the starting fixed fee is £745 with no VAT to add. Both come from our published price list, so the figure you see here is the one on the pricing page.
The fee covers our drawings only. Anything the council charges is separate and goes to the council, never through us, so you can see exactly what you are paying each party for.
How big a dormer can you build without planning permission
The General Permitted Development Order lets a house owner add to the roof space under its Class B rules, but with a ceiling on the extra volume. For a terrace house that ceiling is 40 cubic metres. Other house types have their own allowance, which we confirm when we measure up, because the figure depends on how the original house is classed.
The limit is on the volume added to the roof space, so the drawings have to show that volume worked out, not just the outline of the dormer box.
The Inspectorate's casework database shows 139 householder appeals decided for Sutton, of which 41% were allowed.
The set-back rule that catches out rear dormers
A roof enlargement under Class B has to sit back from the eaves. The rule is not less than 0.2 metres from the eaves, measured along the slope of the roof, not horizontally on a plan. The two measurements give different answers on a steep roof, and a drawing that uses the wrong one can look compliant on paper and fail on site.
We dimension this along the slope on the elevations, so whoever reads the drawing, whether that is you, a builder or a council officer, checks the same number the rule uses.
Sutton's householder figures, in plain numbers
Wallington sits in the London Borough of Sutton. In the latest four quarters the government statistics show Sutton deciding 601 householder applications, and 92% of them were granted. Householder applications cover extensions, dormers and similar work to a single home, so this is the council's own record for the type of job you are planning.
On speed, 95% of householder decisions, leaving out prior approvals, were made within the eight-week target in the same period. A grant rate is a record of what has happened, not a forecast for your application, and we do not read it as one.
When an appeal is the next step
If a council refuses a householder application, the applicant can appeal to the Planning Inspectorate. The Inspectorate's casework database shows 139 householder appeals decided for Sutton, of which 41% were allowed.
We mention it because it shapes how to draw. A set of drawings that states the dormer's dimensions, materials and relationship to neighbours clearly gives you a clean record whichever way a decision goes.
Conservation areas and checking your own street
The Planning Data Platform lists 15 live conservation areas in Sutton. Whether your street is inside one is something to establish at the start, because it changes which route a dormer can take. Look up your address before you commission anything, or send it to us and we will check it as part of scoping.
A lawful development certificate is the formal way to have the council confirm that a dormer is permitted development. Sutton decided 643 certificates of lawful development across the last eight quarters, so it is a route local homeowners and their drawing providers use regularly.
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, with no VAT to add, from the published price list | drawingsdirect.co.uk |
| £745 | DrawingsDirect starting fixed fee for L-shaped dormer loft conversion permitted development drawings, with no VAT to add, 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 |
| 601 | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 92% | 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 |
| 139 | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 41% | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 15 | 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 |
| 643 | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
Photographs: Christopher Hilton (CC BY-SA 2.0); GRALISTAIR (CC BY-SA 4.0); GRALISTAIR (CC BY-SA 4.0).
