Office to residential conversions can work. This evidence shows how.
The latest issue of Town & Country Planning (September to October 2026) carries a special section on the human cost of permitted development, drawing on UCL's national research with the TCPA. It makes uncomfortable reading, but it also contains the clearest case I have seen for how conversions should be done.
The problem is the route, not the idea
Since 2013, over 100,000 homes have been created through permitted development rights, and around 80% of non-residential buildings can now be converted without planning permission. The UCL findings on what that has produced are stark:
Of 1,029 residents surveyed nationally, 22% scored low enough on a standard wellbeing scale to be at risk of clinical depression, despite being younger, better educated and more likely to be in work than the population as a whole.
In monitored homes, 37% of office conversions spent more than a quarter of summer hours above 26°C.
In London, 42.9% of office to residential addresses sit within 200 metres of "bad neighbour" uses such as scrap and waste sites.
None of this is an argument against adaptive reuse. Reusing sound buildings saves embodied carbon and puts redundant floorspace back to work. The issue is what happens when quality, location and community benefit are taken out of scope.
What good looks like
Two London schemes delivered through full planning show the alternative.
At Queens House in Twickenham, a 2014 prior approval for 41 private one-bed flats was refused. Metropolitan Thames Valley Housing then secured full permission for 45 social rent and shared ownership homes, including family-sized units. The building was stripped back to its frame, reglazed and reclad, and achieved BREEAM Excellent.
At Hexagon Apartments in Camden, the former Parker Tower became 53 homes, every one dual aspect with private outdoor space, alongside a Section 106 affordable housing contribution of over £3 million.
Neither is perfect. A Queens House resident still reports summer overheating, which shows that external shading and the building regulations gap on conversions both need attention. But the contrast with the worst PDR stock is obvious.
Five things that make conversions work
Choose the right building in the right place. Location is the factor PDR cannot fix after the event.
Allow changes to the envelope. Dual aspect, cross ventilation, solar control and new facades are where health outcomes are won or lost.
Match the homes to local need, including affordable and family units, not just the maximum count of studios.
Use the levers that exist. Prior approval, building control, housing standards and, where justified by evidence, Article 4 Directions. UCL and the TCPA are publishing a toolkit for councils in November.
Count the full costs. Cheap units that generate overheating, damp and poor air quality pass the bill on to the NHS, temporary accommodation budgets and the residents themselves. Proper appraisal should capture that.
Tellingly, MHCLG data shows that 54% of commercial to residential conversions over the past decade already went through full planning. Many developers choose that route because it works. The policy question is why we still make the worse route so easy.
