In this spring’s UK edition, we have an in-depth profile of a stunning Scottish passive house that has been designed with careful attention to how it will be recycled at the end of its life, plus a creatively designed low energy London infill home that is a shining example of urban sustainability. This issue also features the transformational energy and ventilation upgrade of 12 Irish social housing units, plus a special report on Ireland’s inspiring retrofit upskilling drive, including the training of workers affected by the country’s decarbonisation programme. There’s also a look back to some early US precursors to the passive house, an ode to old-school scientific instruments, and an impassioned plea that we don’t forget how to ‘build back better’ once the pandemic comes to an end.