Areas / Hillingdon / HA4
Architects in HA4
Ruislip, Ruislip Manor and South Ruislip. Interwar semi-detached houses, widely extended at the side and rear, with lofts.
RIBA Chartered Practice · ARB-registered architects · Extensions, lofts and planning drawings
Planning authority
Which council decides in HA4?
All of HA4 is in Hillingdon, so Hillingdon decides planning applications here. 1,138 postcodes, 8.2 miles from our studio.
| Council | Share of HA4 postcodes |
|---|---|
| Hillingdon | 100% (1,134) |
By postcode sector
| Sector | Postcodes | Council |
|---|---|---|
| HA4 0 | 219 | Hillingdon (mostly; some streets in another council) |
| HA4 4 | 15 | Hillingdon |
| HA4 6 | 225 | Hillingdon |
| HA4 7 | 256 | Hillingdon |
| HA4 8 | 221 | Hillingdon |
| HA4 9 | 202 | Hillingdon |
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Type any postcode in the 33 London boroughs we cover. We'll tell you which council handles planning there and show you the local planning points.
Local planning points
If your home is in Hillingdon
Householder extensions are assessed against Local Plan Part 2 policy DMHD 1, Alterations and Extensions to Residential Dwellings (adopted January 2020).
SourceConverting a house into flats needs an original internal floor area of at least 120 sq m, one unit per floor, and no more than 10% of a street converted (policy DMH 4).
SourceA borough-wide Article 4 direction has required planning permission for small HMOs since 11 December 2025.
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