- Companies
- Civil engineering
- Mountain Ash
- Dan Rail Welding Ltd
Dan Rail Welding Ltd
- Company number
- 12839482
- Incorporated
- 26 Aug 20206 years trading
- Registered office
- 30 Llanwonno Road, Mountain Ash, CF45 3NB
- Nature of business
- Construction of railways and underground railways
Dan Rail Welding Ltd is a 6-year-old private limited company registered in Mountain Ash, company number 12839482, one of 12 civil engineering contractors in Mountain Ash. 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 up £4,423 on the year before, to £4,441.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £9,448 against £5,007 owed within a year: 1.9 times cover.
- 1 employee on average, up from -1 the year before.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Aug 2025 | £4,441 | £9,448 | £5,007 | 1 | |
| 31 Aug 2024 | £18 | £3,938 | £3,920 | -1 | |
| 31 Aug 2023 | £3 | £12K | £12K | -1 | |
| 31 Aug 2022 | £89 | £6,275 | £6,186 | -1 | |
| 31 Aug 2021 | £1,293 | £7,291 | £5,998 | -1 |
Where Dan Rail Welding Ltd is registered
The registered office is in Mountain Ash (CF45), in the Rhondda Cynon Taf local authority area, Wales. Show CF45 3NB on a map.
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What happens if Dan Rail Welding 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 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
- 12839482
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 August 2020 (6 years ago)
- Registered office
- 30 Llanwonno Road, Mountain Ash, CF45 3NB
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 25 August 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 Mountain Ash
Other active civil engineering contractors registered in Mountain Ash.
- DSR Groundworks Ltd2015
- Evanhalli Ltd2019
- I Fix Reinforcements Ltd2008
- JLT Rail Limited2020
- JWG Utilities Limited2017
- Marton (Civil Engineering) Limited1976
- MDF Rail Limited2016
- Prizm Engineering Ltd2025
All civil engineering contractors in Mountain Ash · All trades in Mountain Ash · Civil engineering across the UK
Frequently asked questions
When are Dan Rail Welding Ltd's accounts due?
Dan Rail Welding Ltd's next accounts are due at Companies House by 31 May 2027 (in 230 days), covering the period to 31 August 2026.
When is Dan Rail Welding Ltd'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 Dan Rail Welding Ltd still trading?
Dan Rail Welding Ltd is listed as active on the Companies House register (checked 13 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 Dan Rail Welding Ltd do?
Dan Rail Welding Ltd is registered under Construction of railways and underground railways (SIC 42120).
How old is Dan Rail Welding Ltd?
Dan Rail Welding Ltd was incorporated on 26 August 2020, 6 years ago.
What is the penalty if Dan Rail Welding 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 Dan Rail Welding Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.