- Companies
- Civil engineering
- Winchester
- Deepwater Marine Services Ltd
Deepwater Marine Services Ltd
- Company number
- 16233537
- Incorporated
- 6 Feb 20251 year trading
- Registered office
- 20 Silverwood Close, Winchester, Hampshire, SO22 4QP
- Nature of business
- Construction of water projects; Other specialised construction activities n.e.c.
Deepwater Marine Services Ltd is a 1-year-old private limited company registered in Winchester, company number 16233537, one of 16 civil engineering contractors in Winchester. Its next accounts are due at Companies House on 30 November 2027, and the CT600 for the period to 28 February 2027 is due at HMRC on 28 February 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2026
From the balance sheet at 28 February 2026, as filed at Companies House.
Where Deepwater Marine Services Ltd is registered
The registered office is in Winchester (SO22), in the Winchester local authority area, South East. Show SO22 4QP on a map.
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What happens if Deepwater Marine Services 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 30 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2027 to 31 Dec 2027 | £150 |
| 1 to 3 months late | 1 Jan 2028 to 29 Feb 2028 | £375 |
| 3 to 6 months late | 1 Mar 2028 to 31 May 2028 | £750 |
| More than 6 months late | From 1 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Feb 2028 | £200 |
| 3 months late | 28 May 2028 | another £200 |
| 6 months late | 28 Aug 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 2029 | 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
- 16233537
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 6 February 2025 (1 year ago)
- Registered office
- 20 Silverwood Close, Winchester, Hampshire, SO22 4QP
- Nature of business
- Construction of water projects (SIC 42910)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2026
- Last confirmation statement
- 5 February 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 Winchester
Other active civil engineering contractors registered in Winchester.
- First Cone Highways Limited2020
- Fordstone Groundworks & Civil Engineering Ltd2026
- Jenkins Utilities Limited2019
- Lenco Civils Limited2026
- Marjoribanks Consulting Ltd2016
- MRJ Miller Limited2024
- Off Grid Installs Limited2022
- RPS Readymix Ltd2024
All civil engineering contractors in Winchester · All trades in Winchester · Civil engineering across the UK
Frequently asked questions
When are Deepwater Marine Services Ltd's accounts due?
Deepwater Marine Services Ltd's next accounts are due at Companies House by 30 November 2027 (in 413 days), covering the period to 28 February 2027.
When is Deepwater Marine Services Ltd's CT600 due?
The CT600 for the period to 28 February 2027 is due at HMRC by 28 February 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2027.
Is Deepwater Marine Services Ltd still trading?
Deepwater Marine Services 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 Deepwater Marine Services Ltd do?
Deepwater Marine Services Ltd is registered under Construction of water projects (SIC 42910); Other specialised construction activities n.e.c. (SIC 43999).
How old is Deepwater Marine Services Ltd?
Deepwater Marine Services Ltd was incorporated on 6 February 2025, 1 year ago.
What is the penalty if Deepwater Marine Services 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 Deepwater Marine Services 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.