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There is no single answer to developing sustainably. Anyone who says there is, is selling you snake oil.

Passivhaus in the middle of the countryside anyone? A 鈥渟ustainable鈥� building made out of concrete? A 鈥済reen wall鈥� that never grows?

Self-evidently future (and existing) buildings will need to be energy efficient. However, a truly sustainable approach will need to be more broadly based: location, transport, building form, longevity and materials all matter. Let me focus on one where we too often let the 鈥渂est鈥� be the enemy of the 鈥済ood鈥�.

Twenty years ago, Lord Rogers proposed an urban renaissance. His taskforce argued that Britain鈥檚 towns should be better places for more sustainable living.

His argument was strong. It has led to many important improvements, in cities such as London and Manchester. But it was not flawless.

Some subsequent development visions have made a naively unnuanced argument that high density development is the future and the answer to all our housing needs.

But the broad mass of the British people has rejected this vision. They seek the joys of the garden suburb: the place to call your own, the places 鈥渨hich even when they are communal are not official 鈥� the pub 鈥� the back garden, the fireside and the 鈥榥ice cup of tea鈥� 鈥� as George Orwell fortuitously put it.

Even pre-covid, the most popular form of home in this country was the private house. People want space. The consequence is that most of our developments are untouched by the urban renaissance: low-density, drive-to cul-de-sacs. But new homes which rely upon miles of new roads are not the affordable, sustainable future to which we aspire.

Fortunately, there is an answer that often works, that has many of the advantages described by Rogers and which is also more popular with the public. I call it 鈥済entle density鈥�: optimising between the undoubted sustainability and connectedness advantages of propinquity and the personal benefits of more space and on-plot access to greenery and personal space.

At its best, gentle density is a network of beautiful streets and squares, of mansion blocks and terraced and semi-detached houses anchored around a village green or a  corner-shop; tree-lined avenues, streets that children can safely walk along, beautiful houses that cherish and evolve the local vernacular and nestle thoughtfully in the landscape.

Such places tend to be more popular, and more prosperous. No one ever complained that a town had too many squares. People respond more warmly, innately and organically to streets which have coherent complexity, colour, texture, and whose forms and features mimic, however imperceptibly, some of the patterns of nature. And they walk in them more. This is how you help people to lead sustainable, and better connected, lives.

If the bad news is that there is no one 鈥渜uick fix鈥� to developing sustainably, the good news is that a key part of the answer is not just good for the planet but good for our souls.

Nicholas Boys Smith is director, Create Streets