Architectural drawings in Marylebone

Marylebone sits within Westminster, so applications are decided by Westminster City Council. Most single-storey rear extensions and side-returns on terraced or semi-detached homes in Marylebone 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: Yes. We check eligibility free at the site visit.

Marylebone is characterised by Georgian and Victorian terraces, mansion blocks. The dominant stock is Georgian terraces, Edwardian mansion blocks. 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.

Westminster City 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 Westminster.

Loft conversion drawings in Marylebone 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.

Westminster has 56 designated conservation areas. Nearest to Marylebone: Mayfair. 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.