Whispers Over the Fence: Has Engineering Ruined the Kleeneze Site for Developers?
- Hanham Green Belt
- 1 hour ago
- 3 min read
As members of Hanham District Green Belt Conservation Society, we are all too familiar with the relentless pressure to build over our local fields. Developers routinely eye up our precious green spaces, claiming they are the "easiest" way to meet South Gloucestershire’s housing targets. Meanwhile, complex brownfield sites right on our doorstep sit empty.
A prime example is the former Kleeneze factory site off Anstey’s Road.
Purchased by the government housing agency Homes England in 2020, this 5.78-acre brownfield site has outline planning permission for a vibrant "urban village" of up to 200 homes, alongside new workspace and a central public square. It was recently put up for sale by real estate agents Savills, with a formal bidding deadline that closed in late March 2026.
On paper, it is the perfect location: just yards from Hanham High Street and a short trip into Bristol city centre. Yet, rumours are swirling through the community that potential buyers are walking away. Why? Because the ground beneath the old brush works is fighting back.
Before it was Kleeneze, this land was home to 18th-century brass works and small-scale quarries, and it sits right on top of Hanham's historical coal mining networks.
To prepare the land for sale, Homes England and their contractors undertook a massive, high-tech engineering project to stabilise the ground. Engineering data reveals the true scale of the underground intervention:
2,700 individual treatment boreholes drilled.
2,350 tons of grout pumped into the earth to fill shallow mining voids and old quarries.
While engineering firms like Stantec have praised the precision of these groundworks, local whispers suggest a major unintended consequence. By filling thousands of underground voids with impenetrable concrete grout and heavily compacting the terrain, developers may have fundamentally changed how water moves through the site.
The Rumour on the Street: Word from industry insiders suggests that this aggressive plugging of mining voids and structural piling has severely disrupted natural subterranean water pathways, resulting in acute, ongoing drainage problems.
Why Developers are Shying Away
With the bidding deadline now passed, the lack of a announced buyer speaks volumes. Ground stabilisation is one thing; resolving a site that has been effectively sealed into an underground bowl that cannot drain naturally is another entirely.
For a developer, a site with compromised drainage represents an expensive, high-risk financial trap. Rectifying drainage issues on a heavily grouted mining site requires complex, engineered sustainable drainage systems (SuDS)—adding millions to construction budgets before a single brick is even laid.
The Double Standard: Brownfield vs. Green Belt
The ongoing saga at Anstey's Road highlights the exact hypocrisy our society fights against. Just down the road, developers are using planning appeals to force major housing developments onto pristine Green Belt land (such as the recent battles near Castle Farm Road), arguing that Bristol’s edge needs to expand.
They claim brownfield regeneration is the priority, yet when given a cleared, outline-consented urban site like Kleeneze, the realities of contaminated land and complex engineering send them running back to our open fields.
We are calling on Homes England to be entirely transparent about the technical data inside the Savills "Data Room" regarding the site's current hydrology and drainage limitations. If the government wants to protect our environment, they must ensure public agencies successfully deliver on complex urban brownfield sites like Kleeneze, rather than allowing unresolved technical blunders to push developers further onto Hanham's green lung.
We will continue to monitor the outcome of the Savills tender process and press South Gloucestershire Council for answers regarding the site's environmental integrity.
Get Involved: What have you noticed near the Anstey’s Road boundaries? If you have seen unusual surface water or have insights into the ongoing site conditions, get in touch with the HDGBCS committee.
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