Loft extension refusal overturned on appeal in Wandsworth.

Wandsworth refused an enlarged roof extension on Festing Road as an unduly dominant, bulky addition that clashed with the council's own design guidance. The Inspector allowed it anyway - because similar upward extensions were already established right along the same row.

The application

✓Site: a two-storey, single-bay-fronted mid-terrace house on Festing Road, Wandsworth, with a two-storey rear outrigger adjoining the neighbour's.
✓Proposal: enlargement of the existing loft extension - a rear roof extension with vertical sides, projecting upward from the rear outrigger.
✓Decision: refused by Wandsworth, then allowed on appeal by the Planning Inspectorate, subject to conditions.

Why the council refused it

Wandsworth's single refusal reason described the extension as an unduly dominant and bulky addition that would relate poorly to the host property, detracting from its character and its setting within the streetscape. The council cited conflict with two Wandsworth Local Plan policies and the council's own Housing Supplementary Planning Document.

What the Inspector found

The Inspector allowed the appeal, with conditions requiring matching materials and obscured, non-opening glazing on a side window for neighbour privacy. On character, the site visit found that outriggers were a repeated feature along the rear of the terrace and the row directly behind it - but that in multiple cases, including next door and several properties on the road behind, those outriggers had already been extended upward with vertical sides.

The Inspector accepted the proposed extension would look different to the current roofline and would conflict with the council's Housing SPD in isolation. But because its design matched the extensions already established nearby, it would respect the area's architectural style rather than dominate it - and that outweighed the conflict with the design guidance.

Where the council's assessment fell short

A few gaps stand out when you compare the refusal reason to the Inspector's decision:

The design guidance was treated as decisive on its own. The refusal leaned entirely on conflict with the Housing SPD, without weighing what was already built directly next door and along the row behind - extensions the Inspector found to be the area's actual prevailing character.

Uncertain planning history didn't defeat the character argument. The council raised doubts about whether those neighbouring extensions had proper permission. But with no enforcement action ever taken against them, the Inspector treated the established streetscape as the relevant baseline regardless of how it got there.

A previous decision on the same site needed more than just its outcome. The council pointed to an earlier, smaller appeal allowed at the same address. The Inspector gave it little weight without evidence of its scale, the policies considered, or which version of the development plan applied at the time.

What this means for other appeals

✓Document extensions already on your row, even ones of uncertain status. A lack of council enforcement against similar nearby development can itself support an argument that the character has already shifted.
✓A design guide conflict isn't automatically fatal. If the real streetscape already includes comparable extensions, that context can outweigh formal design guidance written without reference to what's actually been built.
✓If citing a previous decision on the same site, bring the substance. The scale, the policies considered, and which plan was in force at the time all matter - the outcome alone won't carry much weight.

Refused over harm to character or appearance?

Send us your decision notice and we'll give you an honest read on whether what's already built nearby could work in your favour - and whether Planzo's no win, no fee planning appeal service is the right fit for your case.

Request a free case review Read the appeals guide