Architecture and design events in London, September 2026

September is the month London belongs to architecture and design. Two of the largest festivals in the world run at once, hundreds of buildings open their doors, and the studios shaping the field are out in public. If you work in or around architecture, it is the best stretch of the year to see work, meet people and remember why you do this. Here is what is actually worth your time in September 2026, and the one evening we would end the month on.

This is from the team behind Architecture After Hours, the event we run in London and Berlin.

The two festivals that take over the city (12 to 20 September)

London Design Festival runs from 12 to 20 September, its 24th edition. For nine days the city fills with installations, talks, open showrooms, product launches and exhibitions across a dozen design districts. It is less a single venue than a map: pick a district, give it a day, and see more design than a normal year holds.

Open House Festival overlaps it exactly, 12 to 20 September, and it is free. More than 800 buildings across all 33 boroughs open to the public, many of them normally closed: private houses, working offices, civic landmarks and new builds. The 2026 programme includes the Lloyd's Building for its 40th birthday and the Zaha Hadid Foundation archive for the first time. Some visits are drop-in, some need booking, which opened on 19 August.

Also on during the design weeks

100% Design returns to Olympia in the third week of September, the UK's largest design trade show, useful if you specify products and want to see the market in one hall. Shoreditch Design Week runs 15 to 20 September in the east, a tighter, studio-led counterpoint to the main festival. And RIBA and New London Architecture both run talks and exhibitions through the month, worth checking for a specific evening lecture on a topic you care about.

For architecture specifically, not just design

Most of September leans design. For architecture on foot, an architect-led Brutalism and High-Tech walking tour runs on select dates around the Barbican and the City, reading the concrete and steel landmarks that made the modern city. It is a good way to spend a few hours seeing the buildings up close with someone who can explain them.

End the month with Architecture After Hours (23 September)

Once the festival crowds have gone home, on Wednesday 23 September, we run Architecture After Hours, London Edition, hosted together with Bentley on the 43rd floor of their tower at 8 Bishopsgate. It is the opposite of a trade show: one evening high above the City, with panoramic views and an open bar of cocktails included with your ticket.

The theme is technology and the future of practice. Senior voices from Zaha Hadid Architects, Foster + Partners, KPF, Heatherwick Studio and David Chipperfield Architects take the stage for short, honest talks, one idea each, alongside the computational designer and author Arturo Tedeschi and Bentley's emerging-technology team. Then the talks stop and the real agenda begins: the conversations, and the networking, that do not happen at ground level.

Doors open at 17:00, talks at 17:45, and the evening turns to cocktails and networking from 20:00. It is a small room by design, seventy seats. If you want to be in it, tickets are here.

Why end the month here? Because the festivals are for seeing work, and this is for the conversations that turn into it. If you want to get more out of any evening like this, we wrote separately on how architects turn networking events into work.

Common questions

What architecture events are in London in September 2026? The two big ones are London Design Festival and Open House Festival, both 12 to 20 September. 100% Design and Shoreditch Design Week (15 to 20) run alongside, RIBA and New London Architecture hold talks through the month, and Architecture After Hours closes it on 23 September.

When is London Design Festival 2026? 12 to 20 September 2026, across multiple design districts in the city.

Is Open House London free? Yes. Access to the buildings is free, though some of the more popular visits need to be booked in advance.

What is on for architects specifically, not just designers? Open House is the most architecture-heavy of the festivals, walking tours like the Brutalism and High-Tech route run through the month, and Architecture After Hours on 23 September is built around practising architects and the future of the profession.

See you in September

September is the easiest month of the year to be an architect in London and do nothing but architecture. See the work during the festival weeks, and if you want the evening where the field actually talks to itself, join us on the 23rd.