- Companies
- Civil engineering
- Cardiff
- Ddo Rail Services Limited
Ddo Rail Services Limited
- Company number
- 11378301
- Incorporated
- 23 May 20188 years trading
- Registered office
- PO Box 4385, 11378301 - Companies House Default Address, Cardiff, CF14 8LH
- Nature of business
- Construction of railways and underground railways
Ddo Rail Services Limited is a 8-year-old private limited company registered in Cardiff, company number 11378301, one of 89 civil engineering contractors in Cardiff. Companies House shows its accounts as overdue: they were due on 28 February 2025.
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 unchanged on the year before, at £12.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £222 against £897 owed within a year: 0.2 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2019 to 2023.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2023 | £12 | £222 | £897 | 1 | |
| 31 May 2022 | £12 | £0 | £904 | 1 | |
| 31 May 2021 | £8 | £6,054 | £7,268 | 1 | |
| 31 May 2020 | £4 | £0 | £1,625 | 1 | |
| 31 May 2019 | £2 | £187 | £2,357 |
Where Ddo Rail Services Limited is registered
The registered office is in Cardiff (CF14), in the Caerphilly local authority area, Wales. Show CF14 8LH on a map.
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What happens if Ddo Rail Services Limited files late
If the accounts reach Companies House today, the late filing penalty is £1,500 (£3,000 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2025 to 31 Mar 2025 | £150 |
| 1 to 3 months late | 1 Apr 2025 to 31 May 2025 | £375 |
| 3 to 6 months late | 1 Jun 2025 to 31 Aug 2025 | £750 |
| More than 6 months late | From 1 Sep 2025 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2025 | £200 |
| 3 months late | 31 Aug 2025 | another £200 |
| 6 months late | 30 Nov 2025 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 2026 | 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
- 11378301
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 May 2018 (8 years ago)
- Registered office
- PO Box 4385, 11378301 - Companies House Default Address, Cardiff, CF14 8LH
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2023
- Last confirmation statement
- 22 May 2025
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 in Cardiff
Other active civil engineering contractors registered in Cardiff.
- Divitiae Pecunia Limited2023
- Downs Construction Limited1988
- Elysium Contract Services Ltd2020
- Emi Construction Limited2010
- Evans Telecom Limited2016
- Exact BMS Limited2017
- Ferrier Hart Thomas (Holdings) Limited2009
- Ferrier Hart Thomas Limited2004
All civil engineering contractors in Cardiff · All trades in Cardiff · Civil engineering across the UK
Frequently asked questions
When are Ddo Rail Services Limited's accounts due?
Ddo Rail Services Limited's accounts were due at Companies House on 28 February 2025 and the register shows them as overdue.
When is Ddo Rail Services Limited's CT600 due?
The CT600 for the period to 31 May 2024 is due at HMRC by 31 May 2025, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2025.
Is Ddo Rail Services Limited still trading?
Ddo Rail Services Limited is listed as active on the Companies House register (checked 12 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 Ddo Rail Services Limited do?
Ddo Rail Services Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is Ddo Rail Services Limited?
Ddo Rail Services Limited was incorporated on 23 May 2018, 8 years ago.
What is the penalty if Ddo Rail Services 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 Ddo Rail Services Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.