- Companies
- Civil engineering
- Coastworks Operations Limited
Coastworks Operations Limited
- Company number
- SC343371
- Incorporated
- 23 May 200818 years trading
- Registered office
- 8 Allanton Park Terrace, Fairlie, Ayrshire, KA29 0AW
- Nature of business
- Construction of water projects
Coastworks Operations Limited is a 18-year-old private limited company registered in Fairlie, company number SC343371, one of the UK's civil engineering contractors. 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 £373K (+13.5%) on the year before, to £3.1M.
- Net assets rose in 6 of 8 year-on-year comparisons on record.
- Current assets of £936K against £338K owed within a year: 2.8 times cover.
- 10 employees on average during the year.
- Balance sheets on record for 9 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £3.1M | £352K | £936K | £338K | 10 |
| 31 Mar 2024 | £2.8M | £458K | £1.1M | £350K | 10 |
| 31 Mar 2023 | £2.2M | £551K | £1.1M | £426K | 9 |
| 31 Mar 2022 | £2M | £165K | £825K | £443K | 12 |
| 31 Mar 2021 | £1.8M | £234K | £547K | £234K | 9 |
| 31 Mar 2020 | £2M | £202K | £771K | £410K | 9 |
| 31 Oct 2018 | £1.8M | £263K | £784K | £466K | 11 |
| 31 Oct 2017 | £1.7M | £194K | £452K | £164K | 12 |
| 31 Oct 2016 | £1.7M | £230K | £644K | £410K |
Where Coastworks Operations Limited is registered
The registered office is in Fairlie (KA29), in the North Ayrshire local authority area, Scotland. Show KA29 0AW on a map.
Other trade companies in KA29
- Altern Tree Services LimitedLandscapers and gardeners
- Ivory Mac Projects LtdSpecialist contractors
- Caldra LtdPlumbers and heating engineers
- DC Access LtdPainters and decorators
- BW Industrial Services and Access LtdSpecialist contractors
- Akw Marine LimitedMachinery repair and installation
- Coastworks LimitedCivil engineering
- David Rae Electrical LtdElectricians
Also registered at this address
1 other company uses the same registered office as Coastworks Operations Limited.
- Coastworks LimitedCivil engineering
What happens if Coastworks Operations 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 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
- SC343371
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 May 2008 (18 years ago)
- Registered office
- 8 Allanton Park Terrace, Fairlie, Ayrshire, KA29 0AW
- 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
- 23 May 2026
- Charges (mortgages)
- 7 outstanding of 10 registered
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
Other active civil engineering contractors.
Frequently asked questions
When are Coastworks Operations Limited's accounts due?
Coastworks Operations Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Coastworks Operations Limited'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 Coastworks Operations Limited still trading?
Coastworks Operations 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 Coastworks Operations Limited do?
Coastworks Operations Limited is registered under Construction of water projects (SIC 42910).
How old is Coastworks Operations Limited?
Coastworks Operations Limited was incorporated on 23 May 2008, 18 years ago.
What is the penalty if Coastworks Operations 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 Coastworks Operations 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.