Imagine being invited to dinner inside a water tank.
At Tonwell Tower in Hertfordshire, England, the old tank now contains an open living, kitchen and dining space. The concrete tower, built in the 1960s and no longer required for water storage, was converted into a family home by Matt and Ali Grey.
By 2024 the transformation was complete. The result includes four bedrooms, four bathrooms and a roof terrace with sweeping countryside views. The structure is still unmistakably a water tower from the outside.
And that is what makes the project memorable.
Tonwell Tower stands around 23 metres tall and is protected as a Grade II listed building. That heritage designation helped preserve its distinctive external form.
The Grey family bought it in 2020 and began the difficult task of making the industrial structure suitable for domestic use. The old tank was not designed for dinner parties, and the supporting levels were not intended to contain bedrooms.
In an ordinary house, a staircase is one of several routes between rooms. Here, vertical movement defines the entire layout. Two spiral staircases connect the levels, while the unusual geometry creates spaces that would be hard to reproduce in a conventional new home.
Even ordinary tasks became design challenges. How do you bring furniture into a tower? Where do bathrooms fit into a narrow structure? How much of the historic appearance can be changed?
Water towers once played an important role in local infrastructure. As water systems changed, some became redundant. Their height and recognizable shapes make them difficult to ignore, even when unused.
They also have qualities architects enjoy working with: strong structural forms, unusual proportions and views that ordinary buildings rarely achieve.
Their conversion can be expensive, however. Industrial buildings must meet the requirements of their new use, and heritage protection may limit alterations.
A tower can offer extraordinary views and still have awkward floor plans, complicated access and difficult maintenance.
One of the pleasures of Tonwell Tower is the contrast between its original purpose and the new rooms inside.
The upper living space takes advantage of the former tank’s volume. Bedrooms and bathrooms occupy other levels, and the roof terrace turns a once purely functional structure into a place for looking out across the landscape.
The owners have also made the property available for occasional stays, allowing visitors to experience an industrial building in an entirely new way.
There is a broader architectural point here. Reuse does not always mean preserving an old building as a museum or turning it into a cultural centre. Sometimes a radical change of use can be deeply personal.
Water towers were often built to be visible. They remain familiar features of towns and rural skylines long after the infrastructure around them changes.
If they are demolished, that visual memory disappears. If they are sensitively adapted, they can remain part of the local landscape while serving another purpose.
This is not an argument that every abandoned tower should become a home. Some are unsuitable or too expensive to make safe and comfortable.
But Tonwell Tower demonstrates the possibilities of working with an awkward, recognizable piece of engineering. Instead of flattening its peculiarities, the conversion finds a use for them. A structure originally built to store water has become somewhere people gather around a kitchen table, sleep and watch the sunset.