Dormer extension rejected as harmful to heritage assets

An inspector refused to sanction variation of a condition to substitute approved plans for conversion of a lower ground floor flat and upper floors to form a single dwelling in a London borough conservation area.

The approved plans showed a small dormer on the side elevation towards the rear of the building whereas the proposed drawing showed an enlarged dormer window that would extend across the majority of the side of the roof. The council disputed whether the amendment could be determined under sec.73 but the inspector held that it could, noting that the description of development of the approved planning permission did not specify the dormer window or works to the roof, and while the difference was material it would not be so great as to result in a description of development that was materially different from that permitted.

Considering the impact of the dormer on the character and appearance of the locally listed building and conservation area, the inspector concluded the out-of-keeping width of the dormer would dominate the side elevation, be visible in the street scene and detract from the primary façade, causing harm to the host building and conservation area character which was not outweighed by any public benefit including securing optimum viable use.

Inspector: Rekha Sabu; Written representations

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