Architectural drawings in Harrow on the Hill

Harrow on the Hill sits within Harrow, so applications are decided by Harrow Council. Most single-storey rear extensions and side-returns on terraced or semi-detached homes in Harrow on the Hill fall under Permitted Development — up to 3m deep (attached) or 4m (detached), under 4m high. Flats, listed buildings and conservation areas always require full planning. Article 4 status here: No. We check eligibility free at the site visit.

Harrow on the Hill is characterised by Georgian and Victorian conservation hilltop. The dominant stock is Georgian and Victorian houses, listed buildings. We've drawn extensions and lofts for every period represented here — Victorian rear additions, Edwardian side returns, 1930s wrap-arounds, and contemporary infill where the streetscape allows.

Harrow Council statutory determination is 8 weeks for householder applications. Validation typically adds 1–2 weeks. From your first call to a decision, expect 12–14 weeks total: 1 week measured survey, 2 weeks design, 1–2 weeks validation, 8 weeks determination. We've achieved a 98% first-time approval rate across Harrow.

Loft conversion drawings in Harrow on the Hill start at £1,225 for planning + building regs combined. Construction cost (separate from drawings) is £45,000–£75,000 for a standard rear dormer on a Victorian or Edwardian terrace, £65,000–£95,000 for a hip-to-gable plus dormer. We quote drawings as a fixed fee — no hourly creep.

Harrow has 29 designated conservation areas. Nearest to Harrow on the Hill: Harrow on the Hill. In a conservation area, full planning is required for most external work (including roof additions, rendering, replacement windows). We prepare a Heritage Statement covering the conservation area's character appraisal.