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Brandon Donnelly

Brandon Donnelly

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Cover photo
January 30, 2026
Cover photo
January 30, 2026

Can London really build 180,000 homes on its roofs?

Can London really build 180,000 homes on its roofs?

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.

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.

Cover photo
January 29, 2026

Signage tells you more than just where to go

Cover photo
January 29, 2026

Signage tells you more than just where to go

Cover photo
January 28, 2026

15th annual

Plus, Extell and Hilton announce new Waldorf Astoria in Park City

Cover photo
January 28, 2026

15th annual

Plus, Extell and Hilton announce new Waldorf Astoria in Park City

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

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

We arrived in Revelstoke, BC, yesterday afternoon. The last time I was here was in 2015, and already I can tell that a lot has changed since then. I'm sure I'll have more to say on this over the next few days, but one of the first things that stood out to me was the city's signage.

In 2020, Revelstoke City Council approved a $3.2 million, multi-phase wayfinding plan designed by Cygnus Design Group. So, what I have been seeing are the first completed phases.

Wayfinding signage serves (at least) two critical functions. The first, and most obvious one, is that it tells people where they are and how to get to where they likely want to go. The sign in the cover photo of this post is what you see right before you enter downtown.

The second function of wayfinding signage is to send other signals. It communicates to visitors that things are well-managed, that the place is hospitable, and, most importantly, that the place attracts visitors from around the world. It conveys importance.

Before I had even reached downtown, the signage made me think to myself, "Wow, Revelstoke has grown a lot since I last visited!" That's the power of good communication, and it's a vital part of placemaking.


Cover photo from Cygnus

We arrived in Revelstoke, BC, yesterday afternoon. The last time I was here was in 2015, and already I can tell that a lot has changed since then. I'm sure I'll have more to say on this over the next few days, but one of the first things that stood out to me was the city's signage.

In 2020, Revelstoke City Council approved a $3.2 million, multi-phase wayfinding plan designed by Cygnus Design Group. So, what I have been seeing are the first completed phases.

Wayfinding signage serves (at least) two critical functions. The first, and most obvious one, is that it tells people where they are and how to get to where they likely want to go. The sign in the cover photo of this post is what you see right before you enter downtown.

The second function of wayfinding signage is to send other signals. It communicates to visitors that things are well-managed, that the place is hospitable, and, most importantly, that the place attracts visitors from around the world. It conveys importance.

Before I had even reached downtown, the signage made me think to myself, "Wow, Revelstoke has grown a lot since I last visited!" That's the power of good communication, and it's a vital part of placemaking.


Cover photo from Cygnus

Whistler is out, the Interior of BC is in. Huge real estate deals are out, powder chasing is in. If you're a long-time reader of this blog, you'll know that I do a ski and snowboard trip with a group of friends each year around this time.

Our last three trips were to Park City (where it snowed so much we lost power); Trois Vallées (which also served as my bachelor party and which involved equal parts snowboarding and dancing on tables); and Hokkaido (where it looked like Toronto looks right now).

This year — for annual number fifteen — we're headed to Revelstoke and Kicking Horse in the Selkirk and Purcell Mountains.

On some trips we like to combine an urban trip with the mountains, so that we can also gawk at architecture and urbanism. That's what we did in Japan last year. But this year's trip is not about that. It's about unadulterated time in the mountains.

It has been a weird season for snow. The west coast has been too warm with not enough of it, and the east coast has been too cold with unusual amounts of it. I have no idea what's in store for us this week, but here's to hoping it looks like the cover photo of this post.


In some related real estate news, Extell Development Company and Hilton just announced that they'll be opening a Waldorf Astoria Resort and Residences in the new Deer Valley East Village.

It's going to have 132 hotel keys and 105 one- to six-bedroom branded residences ranging from 1,099 to 5,155 square feet. Of the 105 branded residences, 56 will be "hotel residences" located above the hotel, and the remaining 49 residences will be in a more exclusive standalone residential building.

Whistler is out, the Interior of BC is in. Huge real estate deals are out, powder chasing is in. If you're a long-time reader of this blog, you'll know that I do a ski and snowboard trip with a group of friends each year around this time.

Our last three trips were to Park City (where it snowed so much we lost power); Trois Vallées (which also served as my bachelor party and which involved equal parts snowboarding and dancing on tables); and Hokkaido (where it looked like Toronto looks right now).

This year — for annual number fifteen — we're headed to Revelstoke and Kicking Horse in the Selkirk and Purcell Mountains.

On some trips we like to combine an urban trip with the mountains, so that we can also gawk at architecture and urbanism. That's what we did in Japan last year. But this year's trip is not about that. It's about unadulterated time in the mountains.

It has been a weird season for snow. The west coast has been too warm with not enough of it, and the east coast has been too cold with unusual amounts of it. I have no idea what's in store for us this week, but here's to hoping it looks like the cover photo of this post.


In some related real estate news, Extell Development Company and Hilton just announced that they'll be opening a Waldorf Astoria Resort and Residences in the new Deer Valley East Village.

It's going to have 132 hotel keys and 105 one- to six-bedroom branded residences ranging from 1,099 to 5,155 square feet. Of the 105 branded residences, 56 will be "hotel residences" located above the hotel, and the remaining 49 residences will be in a more exclusive standalone residential building.

Architecture for the project is by KPF and the interiors are by AvroKO.

If you missed my recent post about the East Village and the new Four Seasons that is also currently under construction, click here.


Cover photo by Zach Wear on Unsplash

Architecture for the project is by KPF and the interiors are by AvroKO.

If you missed my recent post about the East Village and the new Four Seasons that is also currently under construction, click here.


Cover photo by Zach Wear on Unsplash

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Brandon Donnelly

Daily insights for city builders. Published since 2013 by Toronto-based real estate developer Brandon Donnelly.

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Brandon Donnelly

Daily insights for city builders. Published since 2013 by Toronto-based real estate developer Brandon Donnelly.

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Brandon Donnelly
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Brandon Donnelly