Despite the urgency with which radical action is required to transform our built environment, Dr Peter Rickaby says he has never been more optimistic about the possibility of change.

Moisture problems are the Achilles heel of many new builds and retrofits, explains Dr Peter Rickaby – problems that can be exacerbated with poorly-conceived energy efficiency efforts, and which may become more prevalent due to climate breakdown.

During a speech last year Theresa May challenged the construction industry to halve the energy use of new buildings, and to halve the cost of retrofit. But we already know how to meet these challenges, writes Peter Rickaby, and much more difficult tasks lie ahead.

The imperative to engage in evidence-based deep retrofit grows by the day. With the UK government dragging its heels, Peter Rickaby finds signs of hope in local initiatives, and in burgeoning Irish efforts.

The net effect of poor insulation levels, underheating and under-ventilation in buildings poses a major public health threat. Peter Rickaby describes one pioneering London project that’s taking a practical, methodical – and scalable – approach to solving the problem.

As understanding grows of the importance to human health of good bacteria in our environment, and new hospitals in the US start to undergo ‘prebiotic’ treatment, Dr Peter Rickaby asks how long it will be before microbiology becomes a core part of building design.

The penny is starting to drop that profound energy saving efforts in buildings – right up to zero emissions levels – are both necessary and urgent if the UK is to honour its climate change targets. So what’s holding up meaningful action, asks Peter Rickaby?

On 13 June, in an address about retrofit policy to the joint conference of the Sustainable Traditional Buildings Alliance and the Society for the Protection of Ancient Buildings, I suggested that the UK retrofit industry is dangerously incompetent, and that is why we need to implement the Each Home Counts industry review. Little did I know that in less than twenty-four hours those words would come back to haunt me in the most horrific way, writes Dr Peter Rickaby.

We all do, argues Dr Peter Rickaby, but the goal of mass retrofitting our energy inefficient building stock is hampered by the fact that when it comes to most retrofits, we simply don’t know what we’re trying to achieve.

A truly sustainable built environment hinges on a multiplicity of factors, not least including the context within which a building sits. Dr Peter Rickaby argues that a focus on cities may lead us in the wrong direction.