- Companies
- Groundworks and demolition
- Shamrock RRT Limited
Shamrock RRT Limited
- Company number
- 12146491
- Incorporated
- 8 Aug 20197 years trading
- Registered office
- 7 Nant Y Felin, Pentraeth Wales, 7 Nant Y Felin, Pentraeth, LL75 8UY
- Nature of business
- Site preparation
Shamrock RRT Limited is a 7-year-old private limited company registered in Pentraeth, company number 12146491, one of the UK's groundworks and demolition companies. Its next accounts are due at Companies House on 31 May 2027, and the CT600 for the period to 31 August 2026 is due at HMRC on 31 August 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 £36K (-45.1%) on the year before, to £44K.
- Net assets rose in 2 of 5 year-on-year comparisons on record.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Aug 2025 | £44K | £0 | £35K | 1 | |
| 31 Aug 2024 | £79K | £16K | £16K | 1 | |
| 31 Aug 2023 | £3,862 | £6,719 | £6,349 | 1 | |
| 31 Aug 2022 | £43K | £52K | £13K | 1 | |
| 31 Aug 2021 | £30K | £34K | £7,887 | 1 | |
| 31 Aug 2020 | £31K | £54K | £28K | 1 |
Where Shamrock RRT Limited is registered
The registered office is in Pentraeth (LL75), in the Isle of Anglesey local authority area, Wales. Show LL75 8UY on a map.
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What happens if Shamrock RRT 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 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 31 Aug 2027 | £375 |
| 3 to 6 months late | 1 Sep 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 12146491
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 August 2019 (7 years ago)
- Registered office
- 7 Nant Y Felin, Pentraeth Wales, 7 Nant Y Felin, Pentraeth, LL75 8UY
- Nature of business
- Site preparation (SIC 43120)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 18 October 2025
- Previous names
- O'Neill Landscape and Groundworks Ltd (until 19 Aug 2024)
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.
Similar companies
Other active groundworks and demolition companies.
Frequently asked questions
When are Shamrock RRT Limited's accounts due?
Shamrock RRT Limited's next accounts are due at Companies House by 31 May 2027 (in 230 days), covering the period to 31 August 2026.
When is Shamrock RRT Limited's CT600 due?
The CT600 for the period to 31 August 2026 is due at HMRC by 31 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 June 2027.
Is Shamrock RRT Limited still trading?
Shamrock RRT 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 Shamrock RRT Limited do?
Shamrock RRT Limited is registered under Site preparation (SIC 43120).
How old is Shamrock RRT Limited?
Shamrock RRT Limited was incorporated on 8 August 2019, 7 years ago.
What is the penalty if Shamrock RRT 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 Shamrock RRT 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.