West Drayton / Sipson / Harmondsworth — covered by Hillingdon Council.
Planning permission drawings delivered by an MCIAT chartered team.
Building regulations drawings delivered by an MCIAT chartered team.
Loft conversion drawings delivered by an MCIAT chartered team.
House extension drawings delivered by an MCIAT chartered team.
Mansard roof extensions delivered by an MCIAT chartered team.
Garage conversion drawings delivered by an MCIAT chartered team.
Basement conversion drawings delivered by an MCIAT chartered team.
Structural calculations delivered by an MCIAT chartered team.
Measured building survey delivered by an MCIAT chartered team.
Party wall services delivered by an MCIAT chartered team.
Rear dormer drawings delivered by an MCIAT chartered team.


UB7 primarily covers West Drayton / Sipson / Harmondsworth in Hillingdon.
Decisions for UB7 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.
Building regs from £950. We do not charge hourly. Free site survey across all UB7 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.
West Drayton / Sipson / Harmondsworth in UB7 is characterised by the housing stock of Hillingdon — broadly 1930s semi-detached dominates.

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Every UB7 postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. UB7 fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| UB7 | West Drayton / Sipson / Harmondsworth | 1930s semi-detached, post-war | UB7 covers West Drayton / Sipson / Harmondsworth only; Hillingdon Council handles the drawing package. |
| UB7 | West Drayton | 1930s semi-detached, post-war | West Drayton sits inside UB7; drawing package proposals here are determined by Hillingdon Council. |
| UB7 | Yiewsley | 1930s semi-detached | Yiewsley sits inside UB7; drawing package proposals here are determined by Hillingdon Council. |
| HA4 | Ruislip | 1930s semi-detached, Tudor cottages | Adjoining district to UB7, also inside Hillingdon for drawing package purposes. |
| HA5 | Pinner / Eastcote | Tudor fragments, Edwardian villas, 1930s semi-detached | Adjoining district to UB7, also inside Hillingdon for drawing package purposes. |
| HA6 | Northwood | 1930s detached, Edwardian villas | Adjoining district to UB7, also inside Hillingdon for drawing package purposes. |
| UB3 | Hayes / Harlington | 1930s semi-detached, post-war estates | Adjoining district to UB7, also inside Hillingdon for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few UB7 streets, and each one changes what a drawing package can achieve at that address.
UB7 (West Drayton / Sipson / Harmondsworth) conservation designations: there are 29 across Hillingdon Council, Ickenham, Uxbridge, Ruislip Village among them. Designation costs a UB7 (West Drayton / Sipson / Harmondsworth) owner the permitted-development route: a drawing package then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Ruislip Village is the UB7 (West Drayton / Sipson / Harmondsworth) designation that most often changes a drawing package design.
No blanket Article 4 over UB7 (West Drayton / Sipson / Harmondsworth): Hillingdon Council has not withdrawn permitted development across UB7 (West Drayton / Sipson / Harmondsworth), so a drawing package outside a UB7 (West Drayton / Sipson / Harmondsworth) conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a UB7 owner wants on file.
The building fabric around UB7 (West Drayton / Sipson / Harmondsworth): 1930s semi-detached dominates; Metropolitan Green Belt covers much of north Hillingdon; Victorian cottages in Uxbridge and Ruislip villages; post-war housing near Heathrow. Largest outer west London borough; significant Green Belt; Heathrow noise contours affect planning decisions in Harmondsworth and Sipson. A drawing package in UB7 (West Drayton / Sipson / Harmondsworth) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Hillingdon Council.
Sources for this UB7 drawing package page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
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