D7 Marine Ltd
- Company number
- 10079704
- Incorporated
- 23 Mar 201610 years trading
- Registered office
- Riverside Boatyard Blundell Lane, Bursledon, Southampton, SO31 1AA
- Nature of business
- Repair and maintenance of ships and boats
D7 Marine Ltd is a 10-year-old private limited company registered in Southampton, company number 10079704, one of 224 machinery repair and installation companies in Southampton. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 £26K (+16.1%) on the year before, to £189K.
- Net assets rose in 6 of 8 year-on-year comparisons on record.
- Current assets of £135K against £30K owed within a year: 4.5 times cover.
- 5 employees on average, up from 2 the year before.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | £189K | £135K | £30K | 5 | |
| 29 Feb 2024 | £162K | £151K | £39K | 2 | |
| 28 Feb 2023 | £133K | £146K | 3 | ||
| 28 Feb 2022 | £90K | £115K | £44K | 2 | |
| 28 Feb 2021 | £18K | £45K | £26K | 2 | |
| 29 Feb 2020 | £13K | £19K | £14K | -2 | |
| 28 Feb 2019 | £16K | £31K | £19K | -3 | |
| 28 Feb 2018 | £5,421 | £6,867 | £8,623 | -3 | |
| 28 Feb 2017 | £8,764 | £13K | £9,682 |
Where D7 Marine Ltd is registered
The registered office is in Southampton (SO31), in the Eastleigh local authority area, South East. Show SO31 1AA on a map.
Other trade companies in SO31
- MNC Cleaning LtdCleaning companies
- Mars Eng. LtdMachinery repair and installation
- Amc Plumbing and Heating LtdPlumbers and heating engineers
- Pride & Bloom LtdLandscapers and gardeners
- Hampshire Heating and Cooling LtdPlumbers and heating engineers
- Kelpie Landscape & Build LtdFinishing trades
- FSC Facilities Services LtdInstallers
- Fitton & Redding Services LimitedMechanics and garages
Also registered at this address
1 other company uses the same registered office as D7 Marine Ltd.
- Eastlake Engines LtdMechanics and garages
What happens if D7 Marine 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 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 10079704
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 March 2016 (10 years ago)
- Registered office
- Riverside Boatyard Blundell Lane, Bursledon, Southampton, SO31 1AA
- Nature of business
- Repair and maintenance of ships and boats (SIC 33150)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 10 February 2026
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in Southampton
Other active machinery repair and installation companies registered in Southampton.
- Danston Ltd2008
- David James Fabrications & Welding Ltd2013
- David Wesley Electrical Services Limited2014
- Deft Engineering Ltd2010
- Designer Aviation Limited1997
- DF Mechanical Limited2012
- Diablo Technical Services Ltd2025
- Diamond Sports Performance Ltd2014
All machinery repair and installation companies in Southampton · All trades in Southampton · Machinery repair and installation across the UK
Frequently asked questions
When are D7 Marine Ltd's accounts due?
D7 Marine Ltd's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is D7 Marine Ltd's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is D7 Marine Ltd still trading?
D7 Marine 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 D7 Marine Ltd do?
D7 Marine Ltd is registered under Repair and maintenance of ships and boats (SIC 33150).
How old is D7 Marine Ltd?
D7 Marine Ltd was incorporated on 23 March 2016, 10 years ago.
What is the penalty if D7 Marine 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 D7 Marine 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.