A West London council has rejected plans to convert an office building into flats as it did not consider the flood risks on the site.
The site, 10 Church Street, sits within the Isleworth Riverside conservation area, which is listed within flood zone 3. This means there is a “high probability” of flooding each year.
A Hounslow Council planning officer said the submitted plans failed to “give adequate consideration to the flood defences.” They continued: “[The plans fail to] include details on how and when the flood defences are going to be repaired/maintained/raised to ensure they will continue to protect the proposed development from flooding for the lifetime of the development.”
The Environment Agency also objected to the application as it “does not comply with the requirements for site-specific flood assessments.” The agency went on to say that the applicant had “not demonstrated that the development is safe for its lifetime” – which for a residential site is around 100 years.
To overcome these objections, the agency advised that the developer should “demonstrate that the flood defence structure has a residual life commensurate with the lifetime of the development.” If this is not possible, then the developer would need to include a new flood defence as part of the proposal.
Additionally, it must be clearly outlined how such flood defence could be raised to meet future requirements, with river levels expected to increase by 0.45 meters in the next 50 years. If these requirements are not met, the objection will be maintained.
The development would have seen the office building converted into 25 flats. It had been hoped work would begin in November 2025, with residents moving in by 2026.
According to planning documents, none of the homes would have been affordable – instead listed on the private market. If approved, the office block would have become home to one studio flat, 11 one-bedroom flats, 10 two-bedroom flats and three three-bedroom flats.
Across the 25 flats, the developer expected around 73 people to live inside the block. However, alongside the environmental agencies objection to the flood risk, nearby residents had also raised objections.
Some residents were concerned there would be increased parking stress, caused by future residents parking on Church Street instead of their allotted car parking spaces. The council argued against this objection, claiming that if approved, residents would be banned from applying for a parking permit.
Locals were also concerned about the potential strain on services caused by 73 people moving into the area. Hounslow Council noted this, however outlined that this is not a consideration under this type of application.
Other objections included “too many flats have been proposed”, which was noted, and potential harm to the conservation area within which the site sits. Planning officers did not feel this would impact the conservation area, or the listed buildings nearby, because the proposal did not involve any alterations to the elevations or external appearance of the building.
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