This Edwardian terraced house stands in a Muswell Hill conservation area designated for the consistency of its street architecture, and keeps much of its original detail. We are replacing a poorly performing conservatory with a brick garden room and adding a zinc loft dormer. The garden room's glazing echoes the rhythm of the original rear doors beside it. The enlarged L-shaped dormer is kept clear of the paired chimneys that the conservation area appraisal names as one of the street's defining features.