- Companies
- Groundworks and demolition
- Merthyr Tydfil
- Williams Drainage Contractors Limited
Williams Drainage Contractors Limited
- Company number
- 11147735
- Incorporated
- 12 Jan 20188 years trading
- Registered office
- 5 Gellifaelog Terrace, Penydarren, Merthyr Tydfil, CF47 9HL
- Nature of business
- Site preparation
Williams Drainage Contractors Limited is a 8-year-old private limited company registered in Merthyr Tydfil, company number 11147735, one of 5 groundworks and demolition companies in Merthyr Tydfil. Its next accounts are due at Companies House on 28 October 2026, and the CT600 for the period to 28 January 2026 is due at HMRC on 28 January 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 £56K (+36.1%) on the year before, to £211K.
- Net assets rose in 4 of 6 year-on-year comparisons on record.
- Current assets of £251K against £91K owed within a year: 2.8 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £211K | £128K | £251K | £91K | 1 |
| 31 Jan 2024 | £155K | £118K | £229K | £66K | 1 |
| 31 Jan 2023 | £166K | £198K | £206K | £36K | 1 |
| 31 Jan 2022 | £200K | £164K | £174K | £58K | 1 |
| 31 Jan 2021 | £105K | £121K | £157K | £40K | 1 |
| 31 Jan 2020 | £61K | £99K | £169K | £144K | 1 |
| 31 Jan 2019 | £26K | £40K | £58K | £32K | 0 |
Where Williams Drainage Contractors Limited is registered
The registered office is in Merthyr Tydfil (CF47), in the Merthyr Tydfil local authority area, Wales. Show CF47 9HL on a map.
Other trade companies in CF47
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- Grain and Groove Carpentry LtdJoiners and carpenters
- Nextnest Properties LimitedProperty developers
- Frontier Power Solutions LtdElectricians
- Jude Developments LtdProperty developers
- Taff Group Property Services LtdPainters and decorators
- Anew Energy LimitedPlumbers and heating engineers
What happens if Williams Drainage Contractors 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 28 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 29 Oct 2026 to 28 Nov 2026 | £150 |
| 1 to 3 months late | 29 Nov 2026 to 28 Jan 2027 | £375 |
| 3 to 6 months late | 29 Jan 2027 to 28 Apr 2027 | £750 |
| More than 6 months late | From 29 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Jan 2027 | £200 |
| 3 months late | 28 Apr 2027 | another £200 |
| 6 months late | 28 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Jan 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
- 11147735
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 January 2018 (8 years ago)
- Registered office
- 5 Gellifaelog Terrace, Penydarren, Merthyr Tydfil, CF47 9HL
- Nature of business
- Site preparation (SIC 43120)
- Year end
- 28 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 11 January 2026
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 in Merthyr Tydfil
Other active groundworks and demolition companies registered in Merthyr Tydfil.
- Chace Group Limited2026
- JPW Surfacing Limited2020
- Merthyr Salvage Limited2003
- RT Manning & Son Brickwork & Groundwork Ltd2024
All groundworks and demolition companies in Merthyr Tydfil · All trades in Merthyr Tydfil · Groundworks and demolition across the UK
Frequently asked questions
When are Williams Drainage Contractors Limited's accounts due?
Williams Drainage Contractors Limited's next accounts are due at Companies House by 28 October 2026 (in 15 days), covering the period to 28 January 2026.
When is Williams Drainage Contractors Limited's CT600 due?
The CT600 for the period to 28 January 2026 is due at HMRC by 28 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 29 October 2026.
Is Williams Drainage Contractors Limited still trading?
Williams Drainage Contractors 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 Williams Drainage Contractors Limited do?
Williams Drainage Contractors Limited is registered under Site preparation (SIC 43120).
How old is Williams Drainage Contractors Limited?
Williams Drainage Contractors Limited was incorporated on 12 January 2018, 8 years ago.
What is the penalty if Williams Drainage Contractors 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 Williams Drainage Contractors 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.