If your dormer or loft conversion has been refused planning permission, you have the right to appeal — and dormer refusals have a high success rate. Our chartered town planners handle the whole process for a fixed fee of £399.
Why dormers get refused
A loft conversion with a rear dormer is the most effective way to add bedrooms to a house, which is why they are so common, but also why councils resist them so often. The frustration for homeowners is the gap between what permitted development allows and what councils will grant permission for. Under Class B permitted development rights, a house can usually have a full-sized rear dormer without any application at all, within a 40 cubic metre volume allowance for terraced houses or 50 for semi-detached and detached.
But those rights don’t always apply. If your property is a flat, if it sits in a conservation area, or if permitted development rights have been removed by condition, you need planning permission — and most councils then expect a dormer roughly half the size of what a neighbouring house could build without asking anyone. Typical guidance requires a dormer set back a metre from the eaves, half a metre down from the ridge and half a metre in from each side. Dormers built to those dimensions are often useless: there is not enough headroom for a staircase to rise from the floor below.
Why these appeals succeed
Attitudes have shifted. Large box dormers have become a defining feature of Victorian and inter-war residential areas, and inspectors have grown more willing to accept them in the right context. If close neighbours have full-sized dormers, permission on appeal is likely. The permitted development comparison is powerful too: it makes little sense to refuse a flat what the house next door could build as of right — an argument that won our Haringey dormer appeal. We also won a dormer appeal in Bromley after the council took issue with one already built.
The other winning argument is necessity. Where a council says a dormer is ‘too large’, it is worth asking whether a smaller one would actually function — if the answer is no, the choice is not between a big dormer and a small one, but between a loft conversion and none at all. Refusals of this kind usually cite the character and appearance of the area, which is a judgement rather than a measurement — and judgements can be challenged.
What the appeal process involves
Since April 2026, householder appeals follow the Part 1 expedited written representations procedure. There is no lengthy appeal statement: the inspector decides on your original application documents, the council’s reasons for refusal, and a concise 250-word summary explaining why the decision was wrong. We complete the appeal form, draft that summary and manage everything through to decision — typically around three to four months. Our guides explain how the appeal system works now and how the 250-word summary is written.
Deadlines and cost
For householder applications you have 12 weeks from the date on the decision notice to appeal. There is no fee to lodge an appeal with the Planning Inspectorate; our fee is a fixed £399 covering the review of your refusal, the appeal form, the 250-word summary and all liaison through to decision. No hidden costs and no hourly rates.
Is your case suitable?
Our fixed-fee service covers dormers, hip-to-gable extensions, L-shaped or ‘double’ dormers and loft conversions generally — on houses and on flats. It does not cover listed building consent, enforcement notices or cases needing a hearing or public inquiry; for those we would refer you to our sister practice, Just Planning. If you’re unsure, just ask.
Get free initial advice
Send us your refusal notice and we’ll review it for free, tell you honestly what we think your chances are, and explain the next steps. Get in touch — we’ll come back to you within one working day.
Dormers are one of the things councils most often pick at. We have overturned dormer refusals in Barnet and Ealing, among other boroughs.