Kensal Gasworks Homes Facing Legal Action Over Cyanide Contamination Kensal Green 2026

Key Points

• Community Legal Threat: Local campaigners and residents around the former Kensal Green Gasworks site are preparing to launch legal action against developers over severe soil contamination concerns.
• Contamination Risks Identified: Campaign documents state the site contains hazardous substances including Prussian blue (cyanide), asbestos, benzene, naphthalene, and toluene, raising concerns over toxic airborne dust during ground disturbance.
• Shift in Focus: The Keep Kensal Green Campaign, originally established to oppose Ballymore and Sainsbury’s £1.7 billion “Project Flourish” scheme, has expanded its challenge to include the adjacent St William Kensal Gasworks development.
• Calls for Protective Enclosures: Opponents and local councillors are demanding protective dome covers over excavation zones to prevent harmful particulates from spreading into surrounding residential areas.
• Cross-Borough Opposition: Political figures from neighbouring authorities, including Brent Council, have voiced major concerns regarding toxic waste transport, traffic disruption, and long-term public health impacts.

Kensal Green (North London News) October 10, 2026 – ‘Wake up and smell the cyanide’, read the campaign posters littered around the former Kensal Green Gasworks site as those in the area prepare to launch legal action against developers of hundreds of homes on a site locals claim is “contaminated”.

The Keep Kensal Green Campaign started as opposition to the Ballymore development—Project Flourish—which was being built in partnership with Sainsbury’s, and while the fight continues for that site, the campaigners have turned to a newer perceived threat, the St William Kensal Gasworks Development.

Why Are Local Residents Threatening Legal Action Over The Kensal Gasworks Scheme?

As reported by Louis Dargavel Corbett of MyLondon, local families and environmental activists are mounting a coordinated resistance against proposed residential developments across the former gasworks footprint. Campaign posters reading “Wake up and smell the cyanide” have been posted across the perimeter of the historic site as residents prepare formal legal proceedings to halt construction.

The initial pushback was directed at “Project Flourish,” a multi-million-pound joint venture between developer Ballymore and supermarket giant Sainsbury’s. However, community opposition has now expanded to include a neighbouring proposal by developer St William, which plans to erect hundreds of new housing units on the plot previously occupied by gasometers.

Residents argue that disturbing heavily contaminated industrial soil risks dispersing hazardous chemical agents into the surrounding atmosphere. According to reports submitted to planning portals by local campaigners, toxic compounds present in the ground include Prussian blue (cyanide complexes), asbestos, benzene, naphthalene, and toluene. Activists warn that fine dust and gaseous emissions generated during site remediation could drift into neighbouring residential communities across Kensington and Chelsea, Brent, and Westminster.

What Safety Measures Are Campaigners and Local Politicians Demanding?

As reported by Louis Dargavel Corbett of MyLondon, community campaigners and local representatives have urged planners to mandate rigorous protective containment measures before any heavy excavation begins.

To mitigate airborne health risks, campaign groups have called on the developers to install protective domed enclosures over active remediation areas during soil excavation. Activists point out that similar brownfield redevelopments carried out elsewhere in the United Kingdom have faced severe public criticism and health complaints from nearby residents when soil remediation occurred in open air.

As reported by Louis Dargavel Corbett of MyLondon, local political figures have also highlighted the broader impacts of the development. Liberal Democrat Councillor Barbara Want of neighbouring Brent Council raised serious concerns regarding public health and transport. Pointing to the potential risks of toxic waste removal and traffic, Councillor Barbara Want asked, “Have you seen Toxic Town?”—referencing the dramatic depiction of historical industrial contamination—while stressing that councillors have received widespread complaints from residents fearful of long-term health consequences. Councillor Barbara Want noted that the heavy traffic required to transport toxic soil off-site represents a critical issue for local road networks and public safety.

How Have Developers and Authorities Responded To Contamination Concerns?

As outlined in planning submissions to the Royal Borough of Kensington and Chelsea (RBKC), developers St William and Ballymore have maintained that comprehensive environmental assessment protocols are being strictly observed.

The developers state that modern land remediation techniques will safely neutralize ground contaminants and transform a restricted brownfield location into an accessible neighbourhood featuring new public open spaces, affordable housing units, and improved pedestrian infrastructure. St William has indicated that its masterplan works in harmony with neighbouring landowners to deliver housing and regenerated green areas while managing environmental risks under regulatory oversight.

Background Of The Development

The site of the proposed housing projects encompasses the historic Kensal Green Gasworks and adjacent land situated within the Kensal Canalside Opportunity Area, recognized as one of the major brownfield development zones in the Royal Borough of Kensington and Chelsea. For over a century, the site was utilized for industrial gas production and storage, leaving behind complex subterranean ground contamination.

In 2021, Ballymore and Sainsbury’s announced details for “Project Flourish,” a massive regeneration scheme designed to deliver over 3,000 homes alongside retail spaces. Following initial planning hurdles and objections from local bodies and the Greater London Authority (GLA), revised transport and contamination reports were submitted to RBKC. In July 2025, developer St William submitted a separate planning application to build 789 housing units on the adjoining former gasometer plot. Both proposals have faced sustained objections from local residents, the Keep Kensal Green Campaign, and surrounding neighbourhood forums.

Prediction: How This Development Can Affect Surrounding Communities

If the housing schemes proceed without the containment protocols demanded by campaign groups, local residents across North and West London could experience notable environmental and daily disruptions:

• Health and Environmental Impact: Uncontained remediation of contaminated soil risks exposing nearby households, schools, and parks to airborne particulate matter and volatile organic compounds. Dust containing traces of heavy metals or chemical residue could exacerbate respiratory conditions among local residents if air monitoring protocols fail.
• Infrastructure and Traffic Congestion: The removal of thousands of tonnes of contaminated soil will necessitate heavy heavy-goods vehicle (HGV) traffic across localized road networks in Brent and Kensington & Chelsea. This increased traffic volume is expected to heighten congestion, elevate localized diesel emissions, and increase wear on surrounding street infrastructure.
• Legal Delays and Housing Delivery Timeline: Ongoing legal challenges mounted by community groups could stall site remediation and construction schedules, delaying the delivery of designated affordable and social housing units earmarked for the area.