Unit 4, Silverdale Industrial Estate Silverdale Road Hayes Data via plota.co.uk

49261/APP/2026/2094 Undecided

Proposal

Details pursuant to the discharge of Condition 25 (Air Quality Assessment) of planning permission ref. dated 12-03-2026 (Demolition of the existing building and structures on site, and all other associated site clearance works. Construction of a data centre building (Class B8) with plant at roof level with an emergency generator (1no.) and associated flue (provided within an external compound adjoining the data centre building), sprinkler tank and pumphouse, security guard house, and provision of one kiosk substation and MV Building. The development also comprises the construction of a new access and internal road and circulation areas, footpaths, provision of car and bicycle parking, hard and soft landscaping and other associated works and ancillary site infrastructure.) Data via plota.co.uk

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View original council record ↗Last checked 8 Oct 2026, 05:22

Application progress

✓

Received

25 Aug 2026

Decision

Expected by 20 Oct 2026

Under consideration

No decision has been issued yet. A decision is expected by 20 Oct 2026.

Documents

View the documents on the council's website ↗

Site constraints 7

3 Article 4 directions

Residential extensions · Changes of use from commercial, business and service uses to dwellinghouses · Construction of new dwellinghouses in employment areas. Named permitted development rights are withdrawn here.

An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.

Strategic industrial land

Reserved for industry and logistics.

The London Plan protects strategic industrial locations from other uses; release needs a plan-led process.

Air quality management area: Hillingdon AQMA

The council has declared the area as failing an air quality objective.

Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.

Council record ↗

1 listed building within 150 m of the postcode pin

Nearest: Benlow Works, Grade II, about 51 m from the postcode pin

The site itself is not listed. Listed building consent is needed for work that affects the special interest of a listed building, inside or out, on top of planning permission. Setting can be a consideration for buildings nearby; there is no fixed radius.

Historic England ↗

Also on the record

National infrastructure project about 1181 m away: M4 Junctions 3 to 12 Smart Motorway; Inside the Hillingdon built-up area; Public transport access: PTAL 3 (moderate), TfL 2023, for the 100 m square.

Not affected

Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 6 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

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Important details

Council: Hillingdon
Received: 25 Aug 2026
Validated: 25 Aug 2026
Ward: HAYES TOWN 2022
Case officer: Show
Target decision: 20 Oct 2026
Agent: Show

Hillingdon

Planning Authority Score

3.5/10

Below average

#219 of 296 councils

Relevant to this application:

Householder decisions

Hillingdon ranks #194 out of 296 councils for householder decision speed. Householder applications are slightly more likely to be approved here (90%) than the national average (90%).

These figures are council-wide context, not a prediction for this application. View full council performance

Hillingdon decision statistics

Based on MHCLG data, the year to March 2026

85%

Overall approval rate

Below avg (87%) #208 of 296

90%

Householder approved

Above avg (90%) #191 of 296

58%

Decided in 8 weeks

Below avg (63%) #194 of 296

45%

Extended time limit

Above avg (41%) #190 of 296

61%

Minor dwellings approved

67 decided (1-9 homes)

65%

Change of use approved

17 decided

1,680

Total decisions

255 refused in the year to March 2026