As a general rule, building a new building is easier than trying to do surgery on an existing one, because you never know exactly what you're going to find when you start the latter. But there are instances where surgery is necessary. According to Bloomberg, developers in London are becoming increasingly interested in the airspace above existing buildings, and it supposedly started because of some policy changes: In 2020, then housing minister Robert Jenrick introduced reforms that relaxed rules to add airspace builds above existing buildings. Owners can now construct additional residential stories to either expand their own dwelling or to create new units altogether without going through full planning permissions, which are often a long and costly process. This was part of a broader set of reforms to boost housing supply, and the current Labour government has not shelved these changes.
Here's an example site listed for £150,000: The site currently comprises the roof and airspace above a 3-storey mixed-use residential-led block (Block B) within The Glassworks Development.
The existing development was constructed in 2017 and comprises 23 residential apartments plus ground floor commercial space, all of which are sold off on long leases.
I had an old boss who was very interested in this idea. For him, it was "free" land and a way to further extract value from an existing real estate portfolio. Of course, it's also a way to build new homes in already built-up cities. Some industry people think that London could accommodate up to 180,000 new homes using this strategy. But these are not simple builds. Can the existing structure and foundations support additional levels? How do you modify the existing elevator(s) while the building below remains occupied? How do you do the mechanical tie-ins without impacting the suite(s) below? All of this makes me wonder how feasible it will be for London to build 180,000 new homes in this way. If it can, that would be a great accomplishment, and one that other cities should aim to emulate. But regardless, I'd love to get under the hood of one of these projects.
Cover photo by Travis Fish on Unsplash Support Brandon Donnelly The daily blog for city builders Show you appreciate this writer, help support their work, and share in their growth over time by buying their writer coin. |
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