- Companies
- Plumbers and heating engineers
- London
- Black Mammoth Plumbing and Heating Ltd
Black Mammoth Plumbing and Heating Ltd
- Company number
- 15604939
- Incorporated
- 30 Mar 20242 years trading
- Registered office
- Flat 15 Chilcombe House, Fontley Way, London, SW15 4NB
- Nature of business
- Plumbing, heat and air-conditioning installation
Black Mammoth Plumbing and Heating Ltd is a 2-year-old private limited company registered in London, company number 15604939, one of 2,972 plumbing and heating companies in London. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 March 2025, as filed at Companies House.
Who runs and owns Black Mammoth Plumbing and Heating Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| V*** M*** | Director | Mar 2024 |
| J*** M*** | Director | Mar 2024 |
People with significant control (2)
Where Black Mammoth Plumbing and Heating Ltd is registered
The registered office is in London (SW15), in the Wandsworth local authority area, London. Show SW15 4NB on a map.
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What happens if Black Mammoth Plumbing and Heating 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 15604939
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 March 2024 (2 years ago)
- Registered office
- Flat 15 Chilcombe House, Fontley Way, London, SW15 4NB
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 20 March 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 London
Other active plumbing and heating companies registered in London.
- Blackcatrenovation Ltd2025
- Blackheath Bathrooms Ltd2025
- Blackheath Boilers Ltd2025
- Blackstone Services Limited2023
- BLB Plumbing and Heating Group Ltd2020
- Blissfix Plumbing and Heating Ltd2026
- Blomfield Heating Ltd2024
- Blue Cone Limited2018
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Black Mammoth Plumbing and Heating Ltd's accounts due?
Black Mammoth Plumbing and Heating Ltd's next accounts are due at Companies House by 31 December 2026 (in 78 days), covering the period to 31 March 2026.
When is Black Mammoth Plumbing and Heating Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Black Mammoth Plumbing and Heating Ltd still trading?
Black Mammoth Plumbing and Heating 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 Black Mammoth Plumbing and Heating Ltd do?
Black Mammoth Plumbing and Heating Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Black Mammoth Plumbing and Heating Ltd?
Black Mammoth Plumbing and Heating Ltd was incorporated on 30 March 2024, 2 years ago.
Who runs Black Mammoth Plumbing and Heating Ltd?
Black Mammoth Plumbing and Heating Ltd has 2 active directors, the longest-serving appointed in Mar 2024. Their names and service addresses are on the Companies House register.
Who owns Black Mammoth Plumbing and Heating Ltd?
2 people or companies have significant control of Black Mammoth Plumbing and Heating Ltd: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if Black Mammoth Plumbing and Heating 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 Black Mammoth Plumbing and Heating 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.