The Twentieth Century Society
Also known as: C20 Society
The Twentieth Century Society is a membership organisation, open to all, which campaigns for the conservation of the best c20th architecture. It was founded in 1979 as The Thirties Society and is now recognised by government and has a statutory role in the planning process in England. It organises lectures, conference and study tours in the UK and abroad
Activities & Mission
The Twentieth Century Society is a membership organisation, open to all, which campaigns for the conservation of the best c20th architecture. It was founded in 1979 as The Thirties Society and is now recognised by government and has a statutory role in the planning process in England. It organises lectures, conference and study tours in the UK and abroad
Areas of Operation
Where this charity is registered to operate, as self-declared to the Charity Commission. These are regulatory classifications, not a list of active programmes, and don't necessarily indicate fundraising activity in each location.
Region
Financial Information
Financial Efficiency
Financial Trend
Annual Returns
As filed with the Charity Commission for England and Wales. Most recent filing covers the financial year ending 2024.
| Financial Year | Income | Expenditure | Charitable Spending | Net Assets | Reserves | Staff |
|---|---|---|---|---|---|---|
| 2024 | £464,115 | £381,610 | 0 / 50 | |||
| 2023 | £403,411 | £413,146 | 0 / 56 | |||
| 2022 | £332,252 | £340,707 | 0 / 41 | |||
| 2021 | £297,108 | £305,554 | 0 / 41 | |||
| 2020 | £249,069 | £265,436 | 0 / 47 |
Staff column shows: Employees / Volunteers
Frequently asked questions about The Twentieth Century Society
What does The Twentieth Century Society do?
The Twentieth Century Society is a membership organisation, open to all, which campaigns for the conservation of the best c20th architecture. It was founded in 1979 as The Thirties Society and is now recognised by government and has a statutory role in the planning process in England. It organises lectures, conference and study tours in the UK and abroad
How much income did The Twentieth Century Society report in 2024?
The Twentieth Century Society reported total income of £464k and reported expenditure of £382k for the financial year ending 2024, based on the most recent annual return filed with the Charity Commission.
When was The Twentieth Century Society registered as a charity?
The Twentieth Century Society was registered with the Charity Commission for England and Wales on 28 June 2005 as charity number 1110244. It has been registered for 21 years.
Who runs The Twentieth Century Society?
The Twentieth Century Society is governed by a board of 16 trustees. Trustees are legally responsible for the charity's governance and are listed in full on its profile.
Where does The Twentieth Century Society operate?
The Twentieth Century Society operates in England And Wales, as recorded in its Charity Commission filing.
Is The Twentieth Century Society a registered charity?
Yes — The Twentieth Century Society is a registered charity in England and Wales, charity number 1110244.
Details
LONDON
EC1M 6EJ
Registry Information
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Also governs 1 other charity
Also governs 1 other charity
Also Known As
- C20 Society
Data & trust
- Register data refreshed
- 30 July 2026
- Methodology
- How metrics are calculated