- Companies
- Groundworks and demolition
- Pwllheli
- Cynlas Groundworks Limited
Cynlas Groundworks Limited
- Company number
- 15870954
- Incorporated
- 1 Aug 20242 years trading
- Registered office
- Gwyn Thomas & Co, 1 Thomas Buildings, New Street, Pwllheli, Gwynedd, LL53 5HH
- Nature of business
- Site preparation
Cynlas Groundworks Limited is a 2-year-old private limited company registered in Pwllheli, company number 15870954, one of the UK's groundworks and demolition companies. 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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Financial snapshot, 2025
From the balance sheet at 31 March 2025, as filed at Companies House.
Where Cynlas Groundworks Limited is registered
The registered office is in Pwllheli (LL53), in the Gwynedd local authority area, Wales. Show LL53 5HH on a map.
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What happens if Cynlas Groundworks 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
- 15870954
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 August 2024 (2 years ago)
- Registered office
- Gwyn Thomas & Co, 1 Thomas Buildings, New Street, Pwllheli, Gwynedd, LL53 5HH
- Nature of business
- Site preparation (SIC 43120)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 31 July 2026
Filing notes for groundworks and demolition companies
Groundworks and demolition companies tend to own heavy plant, so capital allowances and hire purchase liabilities show up in both the accounts and the CT600.
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Frequently asked questions
When are Cynlas Groundworks Limited's accounts due?
Cynlas Groundworks 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 Cynlas Groundworks 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 Cynlas Groundworks Limited still trading?
Cynlas Groundworks 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 Cynlas Groundworks Limited do?
Cynlas Groundworks Limited is registered under Site preparation (SIC 43120).
How old is Cynlas Groundworks Limited?
Cynlas Groundworks Limited was incorporated on 1 August 2024, 2 years ago.
What is the penalty if Cynlas Groundworks 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 Cynlas Groundworks 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.