- Companies
- Plumbers and heating engineers
- Caernarfon
- A & M Williams Plumbing & Heating Limited
A & M Williams Plumbing & Heating Limited
- Company number
- 15740661
- Incorporated
- 25 May 20242 years trading
- Registered office
- Llys Aled, Pontllyfni, Caernarfon, Gwynedd, LL54 5EG
- Nature of business
- Plumbing, heat and air-conditioning installation
A & M Williams Plumbing & Heating Limited is a 2-year-old private limited company registered in Caernarfon, company number 15740661, one of 5 plumbing and heating companies in Caernarfon. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 May 2025, as filed at Companies House.
Where A & M Williams Plumbing & Heating Limited is registered
The registered office is in Caernarfon (LL54), in the Gwynedd local authority area, Wales. Show LL54 5EG on a map.
Other trade companies in LL54
- Ow Autos LimitedMechanics and garages
- Sej Motors LtdMechanics and garages
- Aw Diving LtdCivil engineering
- PWG Construction LtdBuilders
- Cars Gwynedd LimitedMotor traders
- Gwasanaethau Adeiladu A Chyfleustodau WR Construction and Utility Services LimitedInstallers
- CLP Surfacing & Groundworks LtdCivil engineering
- Rirox LtdBuilders
What happens if A & M Williams Plumbing & Heating 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 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 15740661
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 May 2024 (2 years ago)
- Registered office
- Llys Aled, Pontllyfni, Caernarfon, Gwynedd, LL54 5EG
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 24 May 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 Caernarfon
Other active plumbing and heating companies registered in Caernarfon.
- Aton Solar Cyf2011
- Eco Green Heating Ltd2010
- Tanau PLW Fires Limited2024
- Vaynol Plumbing & Heating Ltd2013
All plumbing and heating companies in Caernarfon · All trades in Caernarfon · Plumbers and heating engineers across the UK
Frequently asked questions
When are A & M Williams Plumbing & Heating Limited's accounts due?
A & M Williams Plumbing & Heating Limited's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 31 May 2026.
When is A & M Williams Plumbing & Heating Limited's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is A & M Williams Plumbing & Heating Limited still trading?
A & M Williams Plumbing & Heating 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 A & M Williams Plumbing & Heating Limited do?
A & M Williams Plumbing & Heating Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is A & M Williams Plumbing & Heating Limited?
A & M Williams Plumbing & Heating Limited was incorporated on 25 May 2024, 2 years ago.
What is the penalty if A & M Williams Plumbing & Heating 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 A & M Williams Plumbing & Heating 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.