- Companies
- Civil engineering
- Marlborough
- Potamii Ltd
Potamii Ltd
- Company number
- 06907247
- Incorporated
- 15 May 200917 years trading
- Registered office
- C/O KFS Accountants, Elcot Park, Elcot Lane, Marlborough, Wiltshire, SN8 2BG
- Nature of business
- Construction of water projects
Potamii Ltd is a 17-year-old private limited company registered in Marlborough, company number 06907247, one of the UK's civil engineering contractors. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £3,423 (-23.6%) on the year before, to £11K.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £75K against £69K owed within a year: 1.1 times cover.
- 3 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £11K | £57K | £75K | £69K | 3 |
| 31 Mar 2024 | £14K | £52K | £67K | £62K | 3 |
| 31 Mar 2023 | £47K | £66K | £103K | £70K | 5 |
| 31 Mar 2022 | £103K | £99K | £145K | £63K | 5 |
| 31 Mar 2021 | £118K | £94K | £148K | £4,958 | 5 |
| 31 Mar 2020 | £145K | £98K | £166K | £4,524 | 5 |
| 31 Mar 2019 | £187K | £156K | £226K | £22K | 7 |
| 31 May 2018 | £117K | £41K | £199K | £85K | 6 |
| 31 May 2017 | £3,534 | £56K | £89K | £87K | 2 |
| 31 May 2016 | £1,557 | £22K | £82K | £78K |
Where Potamii Ltd is registered
The registered office is in Marlborough (SN8), in the Wiltshire local authority area, South West. Show SN8 2BG on a map.
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What happens if Potamii Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 06907247
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 May 2009 (17 years ago)
- Registered office
- C/O KFS Accountants, Elcot Park, Elcot Lane, Marlborough, Wiltshire, SN8 2BG
- Nature of business
- Construction of water projects (SIC 42910)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 18 October 2025
- Previous names
- Aquadam Europe Limited (until 18 Oct 2022)
Albion Water Structures Ltd (until 6 Mar 2014)
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Marlborough
Other active civil engineering contractors registered in Marlborough.
All civil engineering contractors in Marlborough · All trades in Marlborough · Civil engineering across the UK
Frequently asked questions
When are Potamii Ltd's accounts due?
Potamii Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Potamii Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Potamii Ltd still trading?
Potamii Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Potamii Ltd do?
Potamii Ltd is registered under Construction of water projects (SIC 42910).
How old is Potamii Ltd?
Potamii Ltd was incorporated on 15 May 2009, 17 years ago.
What is the penalty if Potamii Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Potamii Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.