- Company number
- 12453619
- Incorporated
- 10 Feb 20206 years trading
- Registered office
- Ceris High Street, Bryngwran, Holyhead, LL65 3PP
- Nature of business
- Construction of domestic buildings
Coast Construction Ynys Mon Limited is a 6-year-old private limited company registered in Holyhead, company number 12453619, one of 10 building contractors in Holyhead. 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 £23K (+27.6%) on the year before, to £105K.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £174K against £98K owed within a year: 1.8 times cover.
- 3 employees on average, up from -2 the year before.
- 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 |
|---|---|---|---|---|---|
| 28 Feb 2025 | £105K | £174K | £98K | 3 | |
| 29 Feb 2024 | £82K | £202K | £203K | £139K | -2 |
| 28 Feb 2023 | £83K | £200K | £137K | -3 | |
| 28 Feb 2022 | £25K | £62K | £62K | £57K | 4 |
| 28 Feb 2021 | £99 | 0 |
Where Coast Construction Ynys Mon Limited is registered
The registered office is in Holyhead (LL65), in the Isle of Anglesey local authority area, Wales. Show LL65 3PP on a map.
Other trade companies in LL65
- Guy B Electrical LtdElectricians
- Ellis Property & Holdings LtdProperty developers
- Spotless Stay Cleaning LimitedCleaning companies
- Gwasanaethu Adeiladu Cyflawn CyfGroundworks and demolition
- Joclean’S Cleaning Company Ltd.Cleaning companies
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- Cybicleaningservices LtdCleaning companies
- Parkinson Plumbing and Heating LtdPlumbers and heating engineers
What happens if Coast Construction Ynys Mon 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 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
- 12453619
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 February 2020 (6 years ago)
- Registered office
- Ceris High Street, Bryngwran, Holyhead, LL65 3PP
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 29 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 4 November 2025
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Holyhead
Other active building contractors registered in Holyhead.
- Draig Goch Limited2017
- Edward Construction Services Ltd2001
- Hughes Construction (Anglesey) Ltd2014
- Ingram Property Development Limited2003
- JCM Construction Anglesey Limited2021
- R Mills, Daughter & Son Ltd2005
- RP Construction & Rendering Ltd2025
- A T Jones Building & Damp Proofing Ltd2016
All building contractors in Holyhead · All trades in Holyhead · Builders across the UK
Frequently asked questions
When are Coast Construction Ynys Mon Limited's accounts due?
Coast Construction Ynys Mon Limited's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is Coast Construction Ynys Mon Limited'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 Coast Construction Ynys Mon Limited still trading?
Coast Construction Ynys Mon 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 Coast Construction Ynys Mon Limited do?
Coast Construction Ynys Mon Limited is registered under Construction of domestic buildings (SIC 41202).
How old is Coast Construction Ynys Mon Limited?
Coast Construction Ynys Mon Limited was incorporated on 10 February 2020, 6 years ago.
What is the penalty if Coast Construction Ynys Mon 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 Coast Construction Ynys Mon 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.