Architectural drawings in Harefield

Harefield sits within Hillingdon, so applications are decided by Hillingdon Council. Most single-storey rear extensions and side-returns on terraced or semi-detached homes in Harefield 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.

Harefield is characterised by village conservation, rural fringe. The dominant stock is Tudor and Georgian fragments, 1930s semi-detached. 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.

Hillingdon 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 Hillingdon.

Loft conversion drawings in Harefield 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.

Hillingdon has 29 designated conservation areas. Nearest to Harefield: Uxbridge. 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.