- Companies
- Civil engineering
- Plymouth
- Hydro Environmental Limited
Hydro Environmental Limited
- Company number
- 03295748
- Incorporated
- 23 Dec 199629 years trading
- Registered office
- 22 the Square, Stonehouse, Plymouth, PL1 3JX
- Nature of business
- Construction of water projects
Hydro Environmental Limited is a 29-year-old private limited company registered in Plymouth, company number 03295748, one of 41 civil engineering contractors in Plymouth. Its next accounts are due at Companies House on 30 April 2027, and the CT600 for the period to 31 July 2026 is due at HMRC on 31 July 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 up £136 (+4.9%) on the year before, to £2,918.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £15K against £12K owed within a year: 1.2 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 Jul 2025 | £2,918 | £15K | £12K | 3 | |
| 31 Jul 2024 | £2,782 | £13K | £11K | 3 | |
| 31 Jul 2023 | £2,448 | £28K | £26K | 3 | |
| 31 Jul 2022 | £1,721 | £48K | £47K | 3 | |
| 31 Jul 2021 | £1,565 | £41K | £40K | 3 | |
| 31 Jul 2020 | -£9,383 | £42K | £52K | 3 | |
| 31 Jul 2019 | -£10K | £4,891 | £16K | ||
| 31 Jan 2018 | £46K | £61K | £15K | ||
| 31 Jan 2017 | £19K | £59K | £42K | ||
| 31 Jan 2016 | £21K | £55K | £35K |
Where Hydro Environmental Limited is registered
The registered office is in Plymouth (PL1), in the Plymouth local authority area, South West. Show PL1 3JX on a map.
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Also registered at this address
17 other companies use the same registered office as Hydro Environmental Limited.
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What happens if Hydro Environmental Limited 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 30 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 May 2027 to 31 May 2027 | £150 |
| 1 to 3 months late | 1 Jun 2027 to 31 Jul 2027 | £375 |
| 3 to 6 months late | 1 Aug 2027 to 31 Oct 2027 | £750 |
| More than 6 months late | From 1 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 03295748
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 December 1996 (29 years ago)
- Registered office
- 22 the Square, Stonehouse, Plymouth, PL1 3JX
- Nature of business
- Construction of water projects (SIC 42910)
- Year end
- 31 July (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 21 December 2025
- Previous names
- Hydro Environmental Services Limited (until 1 Sep 2018)
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 Plymouth
Other active civil engineering contractors registered in Plymouth.
- Hymec Investments Ltd2015
- Ian M Sumner Installation Ltd2020
- J. Jenkins Limited1984
- JD Civil Construction Ltd2025
- Kjwilderscapes Ltd2024
- Landmark Utility Services Ltd2017
- Marc Sealey Limited2009
- Mechanus Gravitas Ltd2025
All civil engineering contractors in Plymouth · All trades in Plymouth · Civil engineering across the UK
Frequently asked questions
When are Hydro Environmental Limited's accounts due?
Hydro Environmental Limited's next accounts are due at Companies House by 30 April 2027 (in 199 days), covering the period to 31 July 2026.
When is Hydro Environmental Limited's CT600 due?
The CT600 for the period to 31 July 2026 is due at HMRC by 31 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 May 2027.
Is Hydro Environmental Limited still trading?
Hydro Environmental Limited 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 Hydro Environmental Limited do?
Hydro Environmental Limited is registered under Construction of water projects (SIC 42910).
How old is Hydro Environmental Limited?
Hydro Environmental Limited was incorporated on 23 December 1996, 29 years ago.
What is the penalty if Hydro Environmental Limited 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 Hydro Environmental Limited 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.