Thames21 Limited
Thames21 is an environmental charity that restores rivers across London and the Thames Basin to tackle the climate and biodiversity crisis, inspiring communities to enjoy, speak up for and look after them over the long term.
Activities & Mission
Thames21 is an environmental charity that restores rivers across London and the Thames Basin to tackle the climate and biodiversity crisis, inspiring communities to enjoy, speak up for and look after them over the long term.
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
Higher than 74% of UK Environment charities with income £1M to £10M (sample: 234). How is this calculated?
Higher than 53% of UK Environment charities with income £1M to £10M. How is this calculated?
Lower overhead than 51% of UK Environment charities with income £1M to £10M. (Lower overhead is generally read as more efficient.) How is this calculated?
Latest Financial Breakdown
Income Sources
Expenditure Categories
Financial Trend
Annual Returns
As filed with the Charity Commission for England and Wales. Most recent filing covers the financial year ending 2025.
One or more years show a significant change in income (over ±100%) compared with the prior year. This usually reflects a merger, transfer of activities, restated accounts, or a one-off legacy — not necessarily a real change in operating scale. See the methodology for context.
| Financial Year | Income | Expenditure | Charitable Spending | Net Assets | Reserves | Staff |
|---|---|---|---|---|---|---|
| 2025 | £3,186,044 | £3,326,295 | £3,113,374 | £720,635 | £421,000 | 49 / 11664 |
| 2024 | £3,008,845 | £3,084,063 | £2,933,172 | £860,886 | £860,886 | 49 / 12392 |
| 2023 | £2,458,675 | £2,145,919 | £2,068,027 | £936,104 | £936,000 | 35 / 9944 |
| 2022 | £2,258,752 | £1,761,131 | £1,689,190 | £623,348 | £372,348 | 36 / 8466 |
| 2021 | £1,076,104 | £1,069,274 | £1,017,514 | £125,727 | £125,727 | 26 / 1914 |
Staff column shows: Employees / Volunteers
Frequently asked questions about Thames21 Limited
What does Thames21 Limited do?
Thames21 is an environmental charity that restores rivers across London and the Thames Basin to tackle the climate and biodiversity crisis, inspiring communities to enjoy, speak up for and look after them over the long term.
How much income did Thames21 Limited report in 2025?
Thames21 Limited reported total income of £3.19m and reported expenditure of £3.33m for the financial year ending 2025, based on the most recent annual return filed with the Charity Commission.
How efficient is Thames21 Limited?
Thames21 Limited has a program ratio of 97.7%, meaning that share of its income goes directly to charitable activities. This is higher than 74% of UK Environment charities with income £1M to £10M (sample of 234 charities). See our methodology for how this is calculated.
When was Thames21 Limited registered as a charity?
Thames21 Limited was registered with the Charity Commission for England and Wales on 27 May 2004 as charity number 1103997. It has been registered for 22 years.
Who runs Thames21 Limited?
Thames21 Limited is governed by a board of 9 trustees. Trustees are legally responsible for the charity's governance and are listed in full on its profile.
Where does Thames21 Limited operate?
Thames21 Limited operates in England, as recorded in its Charity Commission filing.
Is Thames21 Limited a registered charity?
Yes — Thames21 Limited is a registered charity in England and Wales, charity number 1103997.
Details
GUILDHALL
ALDERMANBURY
LONDON
EC2V 7HH
Registry Information
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Trustees
Sectors & Classifications
Data & trust
- Register data refreshed
- 14 May 2026
- Methodology
- How metrics are calculated