Rooftop plant equipment at Building 3, Chiswick Park, Chiswick, London W4

What was proposed

The application proposed replacing and installing rooftop plant, power cabling and acoustic enclosures for buildings 1 to 5.

“PLANNING COMMITTEENovember 2025 Louise OppeLouise.oppe@hounslow.gov.uk References:P/2025/2433 P/2025/2432 P/2025/2431 P/2025/2430 P/2025/1166 Address: Buildings 1-5 Chiswick Park, 566 Chiswick High Road, Chiswick, W4 5BE Ward:Chiswick Gunnersbury Proposal:Installation of plant equipment with associated power cabling and replacement of existing plant equipment at roof level of the building Application validated: August 2025 This application is presented to the Planning…”

“3.0HISTORY Building 1 P/2012/1302Installation of plant including one generator in blockwork enclosure, two chillers, one buffer vessel and ancillary works. Approved 12/07/2012 Building 2 P/2019/1741Installation of two motorised antennae and four fixed antennae to the roof Approved 03/07/2019 Building 3 P/2001/2838Installation of satellite dish on roof of existing building Approved 28/11/2001 Building 4 P/2011/2939Installation of eleven new condenser units, diesel tank…”

Officer report

Site and earlier permissions

The site is within a business park beside the railway, station and nature reserve, with earlier rooftop plant and antenna permissions for several buildings.

“2.0SITE DESCRIPTION Figure 1 Site Location Plan 2.1The application site is located within Chiswick Business Park which is a Key Existing Office Location immediately north of Chiswick High Street. 2.2The site adjoins the London Overground Gunnersbury railway triangle with Gunnersbury station immediately south and Gunnersbury Triangle Nature Reserve to the east. The site is close to the Chiswick Town Centre and its Primary Shopping Frontage is located to the east of the site.”

Officer report

What officers recommended

Officers recommended approval because the upgraded systems would improve energy efficiency, support sustainability and comply with development policies subject to conditions.

“1.5A noise report confirms the proposal complies with the relevant policies on noise and would not harm neighbour living conditions. The compliance with Noise policies would be secured by condition. 1.6The proposed development, subject to conditions, would comply with Development Plan Policies and would contribute to sustainable infrastructure. The application is therefore recommended for approval, subject to conditions.”

Officer report

Noise and nearby homes

The assessment predicted plant noise at least 10 decibels below background levels, with testing and remedial measures required after installation if necessary.

“Figure 3 separation distances to nearby properties Noise 7.6London Plan policy D14 (Noise), along with adopted Local Plan policy EQ5 (Noise) seek to ensure that the location and design of new development have considered the impact of noise, and mitigation of these impacts, on new uses and surrounding uses according to their sensitivity.”

“7.9The requested plant equipment condition (NP10) includes part (c) that requires post installation testing to be conducted to confirm compliance of the operational plant noise level (namely 10dB below background noise levels), and in the event that measured plant noise levels fail the test there is a requirement for additional remedial measures (mitigation) to be put in place.”

Officer report

Who spoke

The development management head answered questions, a local society chair spoke against, and the estate’s development manager spoke in support.

The vote

Members agreed to vote on all five related applications together and unanimously supported approval.

“[name withheld] reminded Members that the Application was split into five parts but if Members were minded they could, with Chair’s approval, vote on all five at once. Members voted…”

“Cllr Sayyar Raza moved approval of the Applications, seconded by Cllr Marina Sharma. Members voted unanimously to approve the Applications.”

Minutes

The decision

Planning permission was granted for the rooftop plant, power cabling and replacement equipment, subject to conditions.

“Resolved – that planning permission for planning applications P/2025/2433, P/2025/2432, P/2025/2431, P/2025/2430 and P/2025/1166, installation of plant equipment with associated power cabling and replacement of existing plant equipment at roof level of the buildings, was approved, subject to conditions.”

Minutes