Isleworth — covered by Hounslow Council. Fixed-fee planning, building regs, loft, extension and mansard drawings from £840.
From £840. Planning permission drawings delivered by an MCIAT chartered team.
From £840. Building regulations drawings delivered by an MCIAT chartered team.
From £1,225. Loft conversion drawings delivered by an MCIAT chartered team.
From £1,225. House extension drawings delivered by an MCIAT chartered team.
From £1,575. Mansard roof extensions delivered by an MCIAT chartered team.
From £995. Garage conversion drawings delivered by an MCIAT chartered team.
From £1,950. Basement conversion drawings delivered by an MCIAT chartered team.
From £350. Structural calculations delivered by an MCIAT chartered team.
From £450. Party wall services delivered by an MCIAT chartered team.
From £1,225. Rear dormer drawings delivered by an MCIAT chartered team.
TW7 primarily covers Isleworth in Hounslow.
Decisions for TW7 are made by Hounslow Council. Standard Permitted Development rules apply for most rear extensions and loft conversions on terraced and semi-detached houses, unless the property is in a conservation area, is listed, or sits under an Article 4 Direction. Article 4 in Hounslow: No.
Fixed fees: Planning drawings from £840 (Essentials) or £1,750 (Complete). Loft from £1,225. Mansard from £1,575. Building regs from £950. We do not charge hourly. Free site survey across all TW7 addresses.
From first call to planning decision: typically 12–14 weeks. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination. Hounslow Council timelines align with the national norm.
Isleworth in TW7 is characterised by the housing stock of Hounslow — broadly edwardian villas in chiswick and turnham green.