London Borough of Hillingdon

How Hillingdon decides on small housing schemes

Every decision on sites of nine units or fewer, coded from the council's own register and refreshed each quarter. What gets built, what gets approved, and what trips applications up.

Last updated April 2026 439 applications tracked Window: Jan 2023 to Mar 2026 7 areas, 5 scheme types
Applications logged
439
Full, householder and minor resi since Jan 2023
Decided so far
352
176 approved, 176 refused, 43 withdrawn
Approval rate
50%
Just over half of decided applications
Typical time to decide
10 weeks
Median determination time across all small sites

Hillingdon, area by area

Colour shows how often applications get approved. Numbers show how many were decided. Hover or tap an area for detail.

Uxbridge 88 Hayes 110 Ruislip 60 Northwood 29 Harefield 19 West Drayton 28 Heathrow 18 Approval rate 43% 67%
Spotlight

Uxbridge

Decisions
88
Approved
44
Refused
44
Approval rate
50%
Hover or tap any tile to see that area’s detail.
Tile positions are schematic, not to geographic scale. Each hex represents one of Hillingdon’s sub-areas as defined in the council’s own planning framework.

Heathrow approves 67% of applications. Hayes, closer to 43%. Same borough, same policy, 24 percentage points of difference.

Which kinds of schemes get approved?

Bar length shows how many of each type were decided. The split shows the share approved versus refused. Conversion is by far the most common route in Hillingdon, but it's extension that sees the highest approval rate.

Approved Refused Bar length = sample size (max n=153)
Conversion
50%n=153
Demolish & rebuild
57%n=126
End-of-terrace
44%n=25
Extension
60%n=15
Backland
18%n=11
Scheme types with fewer than 10 decisions in the window are not shown here.
Conversion, dividing one home into flats
Demolish & rebuild, existing building replaced with new homes
End-of-terrace, new infill at the end of a terraced row
Extension, rear, side or upward additions creating a new unit
Backland, new build on rear gardens or courtyard land

Why applications fail in Hillingdon

Of every hundred reasons cited in refused decisions in Hillingdon, design quality accounts for the biggest slice at 46%.

Design quality, bulk, massing, appearance 46
Amenity, overlooking, daylight, noise 18
Transport, parking, safety, access 12
Open space, loss of garden or green space 6
Infrastructure, access, parking, drainage 5
Policy, affordable housing, density targets 4
Flood risk 4
Other, mixed reasons 3
Delegated process 1
Heritage, conservation areas, listed setting 1
Read as: “Of every 100 reasons cited in a refusal, 46 relate to design quality.” A single refusal often names two or more reasons. Based on 558 reasons extracted from refused decision notices.

In Hillingdon, what gets a scheme refused is usually how it looks, not how many homes it adds.

Thinking about a specific site?

The dashboard gives you the borough picture. If you have a particular address in mind, we can tell you what the comparable decisions say about your odds, density and capacity.

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Data sources & method

Applications. Sourced from the Greater London Authority (GLA) Planning Datahub and Hillingdon Council’s online planning register. Covers full planning, householder, and minor residential applications of nine units or fewer decided in the window shown above.

Decisions and timing. Outcomes and determination times are taken from the council’s published decision notices.

Refusal reasons. Extracted from refused decision notices that were publicly available. Not every refusal has a readable notice, so totals count all refusals but the reason breakdown covers only those we could read.

Scheme classification. Site types (conversion, demolish & rebuild, extension, and so on) are coded from application descriptions and drawings. Areas are mapped from postcodes and ward names using the council’s own sub-area definitions.

Update frequency. Refreshed quarterly. Next refresh: July 2026.

Nothing here is planning advice. Outcomes are historical and do not predict individual cases. Approval rates vary with site specifics, policy context, and case officer. For a read on a particular site, request a Site Assessment. See our Terms of Use for full details on how this data is compiled and the limits of its use.