Harrow has 9 conservation areas, concentrated mainly in the historic areas of Harrow-on-the-Hill and Pinner village centre. The 1930s semi in this case was on the edge of Pinner — outside the conservation area boundary, with no Article 4 direction in effect.
The full-width rear dormer was designed at the maximum PD width — set 200mm from each party wall boundary projection. At 5.8m internal width, this gave the clients a double bedroom, single bedroom, and shower room at loft level without any planning permission required.
Harrow's LDC team processed the application in 6 weeks. One minor query was raised about whether the property had been subject to any previous extensions that might affect the PD volume calculation. We confirmed it had not, with reference to the original planning records, and the LDC was issued without further queries.
The building regulations package covered structural calculations for the LVL beam supporting the new floor, a Part L energy performance report, and fire escape window specifications. Harrow's approved inspector completed the full plans check in 4 weeks.
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