- Companies
- Plumbers and heating engineers
- Merthyr Tydfil
- J Williams Heating and Plumbing Ltd
J Williams Heating and Plumbing Ltd
- Company number
- 14660086
- Incorporated
- 13 Feb 20233 years trading
- Registered office
- 28 Dan Y Parc View, Incline Top, Merthyr Tydfil, CF47 0GF
- Nature of business
- Plumbing, heat and air-conditioning installation
J Williams Heating and Plumbing Ltd is a 3-year-old private limited company registered in Merthyr Tydfil, company number 14660086, one of 21 plumbing and heating companies in Merthyr Tydfil. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 £29K (+88.4%) on the year before, to £63K.
- Current assets of £49K against £5,060 owed within a year: 9.7 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | £63K | £49K | £5,060 | 2 | |
| 29 Feb 2024 | £33K | £31K | £1,909 | 1 |
Where J Williams Heating and Plumbing Ltd is registered
The registered office is in Merthyr Tydfil (CF47), in the Merthyr Tydfil local authority area, Wales. Show CF47 0GF on a map.
Other trade companies in CF47
- Rji Services LtdMechanics and garages
- R&P Motor Services LtdMechanics and garages
- 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 J Williams Heating and Plumbing 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 30 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 14660086
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 February 2023 (3 years ago)
- Registered office
- 28 Dan Y Parc View, Incline Top, Merthyr Tydfil, CF47 0GF
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 12 February 2026
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Merthyr Tydfil
Other active plumbing and heating companies registered in Merthyr Tydfil.
- Jenkins Heating Ltd2025
- Karl Jones Plumbing & Heating Services Limited2004
- L Murphy Plumbing & Gas Services Ltd2024
- M&T Heating and Plumbing Ltd2025
- Park Heating & Gas Services Limited2018
- SSW Ltd2017
- Will Thomas Plumbing & Heating Ltd2022
- Anew Energy Limited2026
All plumbing and heating companies in Merthyr Tydfil · All trades in Merthyr Tydfil · Plumbers and heating engineers across the UK
Frequently asked questions
When are J Williams Heating and Plumbing Ltd's accounts due?
J Williams Heating and Plumbing Ltd's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is J Williams Heating and Plumbing Ltd's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is J Williams Heating and Plumbing Ltd still trading?
J Williams Heating and Plumbing 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 J Williams Heating and Plumbing Ltd do?
J Williams Heating and Plumbing Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is J Williams Heating and Plumbing Ltd?
J Williams Heating and Plumbing Ltd was incorporated on 13 February 2023, 3 years ago.
What is the penalty if J Williams Heating and Plumbing 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 J Williams Heating and Plumbing 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.