In most cases, yes — prior approval refusals for larger home extensions do unusually well at appeal, because the council is only allowed to consider one narrow issue and often gets it wrong. Here’s how the scheme works, why refusals are so common, and what to do next.
How the larger home extension scheme works
Most houses in England can be extended without full planning permission under permitted development rights: a rear extension up to 3 metres deep for terraced and semi-detached houses, or 4 metres for detached houses. Since 2013, the ‘larger home extension’ scheme has allowed considerably more — up to 6 metres on an attached house, or 8 metres on a detached one — through a light-touch process called prior approval.
Applying for prior approval is far simpler and cheaper than a planning application: a short form, a flat fee (currently £240, against £528 for a full householder application) and a plan showing the extension. The council then notifies your adjoining neighbours. If nobody objects, the council cannot refuse — your extension is permitted development and prior approval is not required. If a neighbour does object, the council gains the power to assess the proposal — but only on one question: the effect on the amenity of neighbouring properties. Design, appearance, trees, parking and everything else are off the table.
Why so many are refused
The problem is that where a neighbour complains, many councils refuse almost as a reflex. Case officers tend to feel that 6-metre extensions are simply too big, and refuse without looking closely at the actual relationship between the extension and the neighbouring house. The assessment is supposed to be an objective judgement about loss of light, outlook and privacy — not a gut reaction to a depth figure.
Why these appeals succeed
We appeal larger home extension refusals regularly and win most of them, because the narrow scope of the assessment cuts both ways: the council cannot fall back on design or character objections, so the appeal turns entirely on whether a single-storey structure genuinely harms the neighbour. It usually doesn’t. A ground-floor extension is low; it rarely has an overbearing presence or casts significant shadow, particularly where the orientation is favourable or the neighbours have extensions of their own. Our Trafford case study is a typical example — prior approval refused over a neighbour’s light, allowed on appeal — and we won one of the earliest of these appeals in Ealing.
Appealing under the 2026 rules
Prior approval refusals are appealed under the Part 1 expedited procedure introduced in April 2026: no appeal statement, no new evidence — just your application documents and a concise summary, around 250 words, of why the council got it wrong. That makes the drawings and any daylight or orientation information in your original application all-important, and puts real weight on how sharply the summary is written. Our guides to winning a planning appeal and the 250-word appeal summary explain the process in full. Deadlines are strict, so don’t sit on a refusal — your decision notice states the time limit for appealing.
If you have been refused prior approval for a 6m or 8m rear extension, send us your refusal for free initial advice. We’ll tell you honestly whether an appeal is worth pursuing — and if it is, we prepare and manage the whole thing for a fixed fee of £399. Councils do not always get these decisions right, and you should not give up.