- Companies
- Civil engineering
- Merthyr Tydfil
- C.J. Railtech Ltd
C.J. Railtech Ltd
- Company number
- 09888332
- Incorporated
- 25 Nov 201510 years trading
- Registered office
- 3 Aberfan Road, Aberfan, Merthyr Tydfil, Wales, CF48 4QL
- Nature of business
- Construction of railways and underground railways
C.J. Railtech Ltd is a 10-year-old private limited company registered in Merthyr Tydfil, company number 09888332, one of 36 civil engineering contractors in Merthyr Tydfil. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 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 £29K (-32.2%) on the year before, to £62K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £66K against £3,941 owed within a year: more than 10 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Nov 2025 | £62K | £66K | £3,941 | 2 | |
| 30 Nov 2024 | £91K | £109K | £18K | 2 | |
| 30 Nov 2023 | £77K | £81K | £3,569 | 0 | |
| 30 Nov 2022 | £80K | £82K | £1,754 | 0 | |
| 30 Nov 2021 | £83K | £97K | £14K | 2 | |
| 30 Nov 2020 | £87K | £121K | £34K | 2 | |
| 30 Nov 2019 | £71K | £95K | £24K | ||
| 30 Nov 2018 | £47K | £82K | £35K | ||
| 30 Nov 2017 | £30K | £50K | £20K | ||
| 30 Nov 2016 | £19K | £34K | £42K | £22K |
Where C.J. Railtech Ltd is registered
The registered office is in Merthyr Tydfil (CF48), in the Merthyr Tydfil local authority area, Wales. Show CF48 4QL on a map.
Other trade companies in CF48
- Valley Roofing Building & Carpentry LimitedRoofers
- Ajl Rail/Civil Engineering LtdCivil engineering
- M&K Valeting LtdCleaning companies
- Mdgroundworks LtdGroundworks and demolition
- Craig Lloyd Groundworks LtdCivil engineering
- Noarc Electrical LtdElectricians
- Elt Brickwork LimitedBuilders
- JBH Decorating LimitedPainters and decorators
What happens if C.J. Railtech Ltd 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 09888332
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 November 2015 (10 years ago)
- Registered office
- 3 Aberfan Road, Aberfan, Merthyr Tydfil, Wales, CF48 4QL
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 24 November 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 Merthyr Tydfil
Other active civil engineering contractors registered in Merthyr Tydfil.
- Collins Construction South Wales Ltd2025
- Collins4Construction Ltd2022
- Construction and Labour Management Ltd2024
- Construction Force Ltd2026
- Craig Lloyd Groundworks Ltd2026
- D&O Steelfixing Ltd2025
- Distinction Rigging and Electrical Ltd2020
- Fonseca Traffic Management & Rail Solutions Ltd2015
All civil engineering contractors in Merthyr Tydfil · All trades in Merthyr Tydfil · Civil engineering across the UK
Frequently asked questions
When are C.J. Railtech Ltd's accounts due?
C.J. Railtech Ltd's next accounts are due at Companies House by 31 August 2027 (in 322 days), covering the period to 30 November 2026.
When is C.J. Railtech Ltd's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is C.J. Railtech Ltd still trading?
C.J. Railtech Ltd 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 C.J. Railtech Ltd do?
C.J. Railtech Ltd is registered under Construction of railways and underground railways (SIC 42120).
How old is C.J. Railtech Ltd?
C.J. Railtech Ltd was incorporated on 25 November 2015, 10 years ago.
What is the penalty if C.J. Railtech Ltd 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 C.J. Railtech Ltd 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.