Cast iron houses were quick to build, with materials in plentiful supply...
Until the price of bricks dropped, making cast iron houses too expensive to make.
That's why there was only 4 cast iron houses built in Dudley!

A Garden to the Guildhall: a free Time Hunters history walk around the City of London
44:19

A Bridge to the Barbican: a free Time Hunters history walk around the City of London
50:06

The Great Fire Trail: a free Time Hunters history walk around the City of London
1:02:38