Denham / Harefield — covered by Hillingdon 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.
UB9 primarily covers Denham / Harefield in Hillingdon.
Decisions for UB9 are made by Hillingdon 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 Hillingdon: 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 UB9 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. Hillingdon Council timelines align with the national norm.
Denham / Harefield in UB9 is characterised by the housing stock of Hillingdon — broadly 1930s semi-detached dominates.