Planning and building regulation drawings in Rayners Lane (HA2)

One pocket is of a different grain. Roxeth Hill, at the foot of the hill, keeps a tighter arrangement of historic buildings from the older Roxeth village, and West Hill is another recorded street nearby. That pocket and the Art Deco centre are both conservation areas, so HA2 is a district where one postcode can mean different rules from street to street. A homeowner on Imperial Drive or Alexandra Avenue should not assume the answer matches one a few roads away.

The projects owners bring us follow from the stock. Long rear gardens leave room for a single-storey extension, though neighbour amenity and boundaries limit how far it should reach. Where a side extension or roof change needs an application, the rhythm of matching bays, gaps between pairs and hipped roofs means it is judged on its effect on the street pattern, and original details such as leaded lights and render bands are valued. Where a house falls inside a conservation area, roof enlargements, side extensions and rear extensions above one storey need planning permission. A flat anywhere in HA2 has no householder permitted development rights.

Planning in Rayners Lane: what to know before you apply

Harrow treats the two conservation areas in HA2 as the main added constraint: Roxeth Hill, protecting the village character and its listed and locally listed buildings, and Rayners Lane, covering the station and the Art Deco parades. The council does not publish its Article 4 boundaries in a form that national data can show, so we confirm coverage for each address from the council's own maps rather than assuming. In ordinary streets Harrow expects extensions to respect the consistent semi-detached house type, which means attention to roof form, building line and how a side addition changes the gap between neighbours. The borough also applies Article 4 controls to HMO conversions in designated wards.

Applications are decided by London Borough of Harrow — its planning pages.