- Companies
- Civil engineering
- Chelmsford
- Hydromain Ltd
Hydromain Ltd
- Company number
- 12198379
- Incorporated
- 10 Sep 20197 years trading
- Registered office
- Swift House, Ground Floor, 18 Hoffmanns Way, Chelmsford, Essex, CM1 1GU
- Nature of business
- Construction of water projects
Hydromain Ltd is a 7-year-old private limited company registered in Chelmsford, company number 12198379, one of 63 civil engineering contractors in Chelmsford. 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 up £61K (+58.6%) on the year before, to £165K.
- Net assets rose in 4 of 5 year-on-year comparisons on record.
- Current assets of £257K against £97K owed within a year: 2.7 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £165K | £197K | £257K | £97K | 0 |
| 31 Mar 2024 | £104K | £135K | £193K | £91K | 2 |
| 31 Mar 2023 | £80K | £68K | £151K | £76K | 2 |
| 30 Sep 2022 | £91K | £63K | £124K | £41K | 2 |
| 30 Sep 2021 | £69K | £39K | £75K | £17K | 1 |
| 30 Sep 2020 | £1 | £1 |
Where Hydromain Ltd is registered
The registered office is in Chelmsford (CM1), in the Chelmsford local authority area, East of England. Show CM1 1GU on a map.
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Shared registered office
100 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Hydromain 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
- 12198379
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 September 2019 (7 years ago)
- Registered office
- Swift House, Ground Floor, 18 Hoffmanns Way, Chelmsford, Essex, CM1 1GU
- 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
- 9 September 2026
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 Chelmsford
Other active civil engineering contractors registered in Chelmsford.
- JKL Projects Limited2007
- KTN Surfacing Ltd2024
- LJR Engineering Project Services Limited2007
- Mend and Heal Ltd2018
- MGC Welding Limited2003
- Mick Everitt Roofing & Welding Services Ltd2009
- Mo Construction Ltd2015
- Mosedale Energy Limited2021
All civil engineering contractors in Chelmsford · All trades in Chelmsford · Civil engineering across the UK
Frequently asked questions
When are Hydromain Ltd's accounts due?
Hydromain 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 Hydromain 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 Hydromain Ltd still trading?
Hydromain 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 Hydromain Ltd do?
Hydromain Ltd is registered under Construction of water projects (SIC 42910).
How old is Hydromain Ltd?
Hydromain Ltd was incorporated on 10 September 2019, 7 years ago.
What is the penalty if Hydromain 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 Hydromain 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.