Wandsworth Council knew for years that Denmead House suffers from serious structural plumbing problems but instead of fixing them, has repeatedly relied on patch jobs, its own repair records reveal.
The result has been families flooded with sewage water, kitchens and bedrooms made uninhabitable, electrics damaged, and parts of the Grade II* listed building itself left to decay.
Tenants at Denmead House, one of the Alton Estate iconic slab blocks, have endured flooding so severe that waste water poured through ceilings into living rooms and kitchens. In some cases, families were forced to abandon bedrooms, live with constant foul smells, and throw away food after water dripped into it.
This is not just a health hazard but a threat to the fabric of one of Britain’s most important modernist estates. Denmead House, inspired by Le Corbusier and completed in the 1950s, is legally protected as a Grade II* listed building. The council has a statutory duty to preserve it. Instead, the evidence indicates long-term neglect.
What the records show
Repair logs that Putney.news has acquired under the Freedom of Information Act show:
- Dozens of plumbing faults logged between 2023 and 2025 – this is unusually high in itself
- The majority of these faults are clearly structural, not tenant-caused – including ceiling leaks, stack blockages (shared vertical waste pipes serving multiple flats), and recurring floods spanning months
- One case from 17 December 2024 described water pouring through ceilings into both kitchen and living room, and linked back to incidents dating as far as October 2023
This pattern of repeat entries confirms what residents have long said: that the council sends contractors to patch immediate leaks but does not replace or modernise the failing systems, resulting in more problems over time.
Data at a glance: what Wandsworth finally disclosed
(Limited to repair logs 2023–2025, released only after appeal)
- Total reports logged: 70+
- Clearly structural issues: ~60%
- Unclear classification: ~30% (poorly described entries, e.g. “repair required”)
- Possible tenant-caused issues: <10%
- Longest-running case: Leaks reported Oct 2023 → still recorded Dec 2024
Families left to cope
The consequences for residents have been devastating. One household reported sewage water contaminating food, carpets, and cupboards, with the smell making entire rooms unusable. Another endured repeated leaks for months before repairs were even attempted, only for the problem to return.
At least one family saw their electrics damaged by waste water. Another neighbour eventually moved out altogether, saying they could no longer cope with the “constant flooding.”
What’s worse is that this is a pattern that has affected not just the Alton Estate but Wandsworth for years, leading to repeat investigations and damning reports on the council’s housing department. In one recent case, the Housing Ombudsman heavily criticised the council for ignoring a roof leak for FOUR YEARS and failing to respond to escalating complaints.
That damning verdict [pdf], published alongside an earlier independent audit report, found “severe maladministration” and triggered a wider order, requiring Wandsworth to overhaul how it manages repairs, oversees housing co-operatives, and learns from complaints.
When we ran our own investigation into mould, we found an extraordinary lack of care and attention and harrowing stories of neglect and misery.
A council that resisted scrutiny
Unfortunately, despite the council having been repeatedly and publicly called out for its negligence, and despite the cabinet member in charge of housing, Aydin Dikerdem, promising swift reform, Putney.news‘ can confirm deep cultural problems within the Wandsworth Council housing department.
We were trying to find out what happened at a single property – Denmead House on the Alton Estate – and faced active obstruction. The records of patch-up plumbing have only came to light after months of resistance from Wandsworth Council.
- An FOI filed in May 2025 was refused under Section 12 (cost limits)
- A narrower request, filed in June, was delayed far past the statutory deadline
- When partial disclosure finally came, it arrived as a PDF of a spreadsheet – rather than simply supplying the spreadsheet itself – that deliberately stripped out formatting, leaving the data unreadable without reconstruction
This list is the only information we have received so far. Other categories including inspection notes, internal correspondence about systemic problems, as well as policy documents on how repeat repairs are handled, remain hidden.
This approach has now been referred to the Information Commissioner for investigation.
Not blocked sinks – structural failure
Council officers have previously implied that plumbing complaints may be caused by tenants misusing sinks or drains. But the repair records undermine that claim. Ceiling leaks, repeated stack blockages, and water ingress into bedrooms and living rooms cannot be blamed on residents.
Where records were unclear, Putney.news has treated them cautiously. Even so, the weight of evidence is overwhelming: Denmead House has chronic systemic plumbing faults that the council has knowingly patched over for years.
The revelations come as Wandsworth Council prepares to ballot residents on the future of other parts of the Alton Estate, which it wants to demolish and redevelop. Community groups have long accused the council of deliberate neglect: allowing blocks to deteriorate through poor maintenance in order to justify demolition.
Denmead House’s repair history, now partly visible, will fuel suspicions that the same approach is being applied here: managing decline on the Alton Estate instead of carrying out the repairs required by law.
This happened in my mum’s place 19 years ago. She’s on the 4th floor. They patched it up, the ceiling fell off and nearly knocked my mum out.