- Companies
- Plumbers and heating engineers
- Newcastle
- William McAllen & Sons Limited
William McAllen & Sons Limited
- Company number
- NI007515
- Incorporated
- 31 Jan 196957 years trading
- Registered office
- 33 Bryansford Gardens, Newcastle, Co Down, BT33 0EQ
- Nature of business
- Plumbing, heat and air-conditioning installation
William McAllen & Sons Limited is a 57-year-old private limited company registered in Newcastle, company number NI007515, one of 50 plumbing and heating companies in Newcastle. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 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 £3,621 (+31.5%) on the year before, to £15K.
- Net assets rose in 2 of 6 year-on-year comparisons on record.
- 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 | £15K | £13K | £50K | 1 | |
| 31 Jan 2024 | £11K | £12K | £47K | £37K | 1 |
| 31 Jan 2023 | £13K | £12K | £50K | £39K | 1 |
| 31 Jan 2022 | £13K | £9,786 | £47K | £38K | 1 |
| 31 Jan 2021 | £27K | £19K | £58K | £36K | 1 |
| 31 Jan 2020 | £36K | £8,333 | £49K | £18K | 1 |
| 31 Jan 2019 | £34K | £9,459 | £49K | £21K |
Where William McAllen & Sons Limited is registered
The registered office is in Newcastle (BT33), in the Newry, Mourne and Down local authority area, Northern Ireland. Show BT33 0EQ on a map.
Other trade companies in BT33
- Tollymore Construction LtdBuilders
- East Coast Cooling LtdPlumbers and heating engineers
- Web Assets LtdCleaning companies
- Altnadue Mechanical Services LtdPlumbers and heating engineers
- Mourne Fire & Electrical LtdElectricians
- DMK Design and Build LtdBuilders
- Hawkins Electrical Contracts LtdElectricians
- C H P Mechanical (NI) LtdPlumbers and heating engineers
What happens if William McAllen & Sons 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 31 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 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
- NI007515
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 31 January 1969 (57 years ago)
- Registered office
- 33 Bryansford Gardens, Newcastle, Co Down, BT33 0EQ
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 28 August 2025
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 Newcastle
Other active plumbing and heating companies registered in Newcastle.
- 3D Gas & Plumbing Limited2021
- A&J Plumbing and Heating Limited2019
- A.I.A. Services Limited1991
- Adf Mechanical Ltd2025
- Ajr Heating Services Ltd2025
- Altnadue Mechanical Services Ltd2026
- Amg Pipework Services Ltd2013
- Apl Heating Limited2000
All plumbing and heating companies in Newcastle · All trades in Newcastle · Plumbers and heating engineers across the UK
Frequently asked questions
When are William McAllen & Sons Limited's accounts due?
William McAllen & Sons Limited's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is William McAllen & Sons Limited's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is William McAllen & Sons Limited still trading?
William McAllen & Sons Limited 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 William McAllen & Sons Limited do?
William McAllen & Sons Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is William McAllen & Sons Limited?
William McAllen & Sons Limited was incorporated on 31 January 1969, 57 years ago.
What is the penalty if William McAllen & Sons 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 William McAllen & Sons Limited 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.