- Companies
- Specialist contractors
- Lowestoft
- Coastal Marine Support Limited
Coastal Marine Support Limited
- Company number
- 12850133
- Incorporated
- 1 Sep 20206 years trading
- Registered office
- Broadbank, Broadview Road, Lowestoft, NR32 3PL
- Nature of business
- Other specialised construction activities n.e.c.; Agents specialized in the sale of other particular products
Coastal Marine Support Limited is a 6-year-old private limited company registered in Lowestoft, company number 12850133, one of 51 specialist construction companies in Lowestoft. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 £2,438 (-7.3%) on the year before, to £31K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £21K against £6,063 owed within a year: 3.4 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £31K | £21K | £6,063 | 1 | |
| 30 Sep 2024 | £34K | £42K | £11K | 1 | |
| 30 Sep 2023 | £3 | £25K | £3,739 | 1 | |
| 30 Sep 2022 | £26K | £2,226 | £4,988 | 1 | |
| 30 Sep 2021 | £9,898 | £39K | £37K | 1 |
Where Coastal Marine Support Limited is registered
The registered office is in Lowestoft (NR32), in the East Suffolk local authority area, East of England. Show NR32 3PL on a map.
Other trade companies in NR32
- Ezra Access Solutions LtdScaffolders
- SLC Plumbing LtdPlumbers and heating engineers
- Yare Developments LimitedProperty developers
- RLB Cleaning and Maintenance LtdFacilities management
- Tech Sparrow LtdMachinery repair and installation
- A J Knights LtdProperty developers
- Cool Beans Air LtdPlumbers and heating engineers
- HR Electrical (East Anglia) LtdElectricians
What happens if Coastal Marine Support 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 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 12850133
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 September 2020 (6 years ago)
- Registered office
- Broadbank, Broadview Road, Lowestoft, NR32 3PL
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
Agents specialized in the sale of other particular products (SIC 46180) - Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 31 August 2026
- Charges (mortgages)
- 1 outstanding of 2 registered
- Previous names
- Coastal Marine Support Limited Limited (until 6 Sep 2022)
Kerrs Quays Ltd (until 23 Feb 2022)
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Lowestoft
Other active specialist construction companies registered in Lowestoft.
- CSK Fabrication Limited2023
- D A Piping Solutions Limited2015
- Damp(UK) Ltd2015
- Darcy Power Services Limited2017
- DK Fibreglass Works Ltd2020
- G Masters Welding and Construction Limited2019
- Grimmer Bespoke Garden Rooms Ltd2022
- Grove Construction Services Ltd2023
All specialist construction companies in Lowestoft · All trades in Lowestoft · Specialist contractors across the UK
Frequently asked questions
When are Coastal Marine Support Limited's accounts due?
Coastal Marine Support Limited's next accounts are due at Companies House by 30 June 2027 (in 260 days), covering the period to 30 September 2026.
When is Coastal Marine Support Limited's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is Coastal Marine Support Limited still trading?
Coastal Marine Support 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 Coastal Marine Support Limited do?
Coastal Marine Support Limited is registered under Other specialised construction activities n.e.c. (SIC 43999); Agents specialized in the sale of other particular products (SIC 46180).
How old is Coastal Marine Support Limited?
Coastal Marine Support Limited was incorporated on 1 September 2020, 6 years ago.
What is the penalty if Coastal Marine Support 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 Coastal Marine Support 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.