- Companies
- Civil engineering
- Pontypridd
- Isource Rail Engineering Ltd
Isource Rail Engineering Ltd
- Company number
- 12258233
- Incorporated
- 12 Oct 20197 years trading
- Registered office
- 8 Clos Caradog, Llantwit Fardre, Pontypridd, CF38 2DQ
- Nature of business
- Construction of railways and underground railways; Construction of other civil engineering projects n.e.c.
Isource Rail Engineering Ltd is a 7-year-old private limited company registered in Pontypridd, company number 12258233, one of 26 civil engineering contractors in Pontypridd. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 is due at HMRC on 31 October 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 £3,436 (-15%) on the year before, to £19K.
- Net assets rose in 1 of 5 year-on-year comparisons on record.
- Current assets of £20K against £17K owed within a year: 1.2 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 Oct 2025 | £19K | £20K | £17K | 0 | |
| 31 Oct 2024 | £23K | £0 | £1,035 | 1 | |
| 31 Oct 2023 | £48K | £58K | |||
| 31 Oct 2022 | £48K | £58K | |||
| 31 Oct 2021 | £48K | £58K | 1 | ||
| 31 Oct 2020 | £2,307 | £8,460 | £5,883 | 1 |
Where Isource Rail Engineering Ltd is registered
The registered office is in Pontypridd (CF38), in the Rhondda Cynon Taf local authority area, Wales. Show CF38 2DQ on a map.
Other trade companies in CF38
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- Northstone Energy LimitedMachinery repair and installation
- HTJ Commercial Cleaning LtdCleaning companies
- CWM Valley Customs LtdMechanics and garages
- Blue Torch LtdElectricians
- Amshearan LtdElectricians
- Thetrowelworks LtdPlasterers
- GD Davies Electrical LtdElectricians
What happens if Isource Rail Engineering 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 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 12258233
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 October 2019 (7 years ago)
- Registered office
- 8 Clos Caradog, Llantwit Fardre, Pontypridd, CF38 2DQ
- Nature of business
- Construction of railways and underground railways (SIC 42120)
Construction of other civil engineering projects n.e.c. (SIC 42990) - Year end
- 31 October (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 11 October 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 Pontypridd
Other active civil engineering contractors registered in Pontypridd.
- LG Networks & Civils Ltd2020
- LSJK Ltd2022
- Mali Rail Limited2020
- P T Civil Engineering Limited2001
- Peter Simmons Surfacing Ltd2014
- S E Batten Limited2022
- S. Adams Services Limited2018
- Storage Management Services UK Ltd2021
All civil engineering contractors in Pontypridd · All trades in Pontypridd · Civil engineering across the UK
Frequently asked questions
When are Isource Rail Engineering Ltd's accounts due?
Isource Rail Engineering Ltd's next accounts are due at Companies House by 31 July 2027 (in 292 days), covering the period to 31 October 2026.
When is Isource Rail Engineering Ltd's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is Isource Rail Engineering Ltd still trading?
Isource Rail Engineering 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 Isource Rail Engineering Ltd do?
Isource Rail Engineering Ltd is registered under Construction of railways and underground railways (SIC 42120); Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Isource Rail Engineering Ltd?
Isource Rail Engineering Ltd was incorporated on 12 October 2019, 7 years ago.
What is the penalty if Isource Rail Engineering 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 Isource Rail Engineering 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.