- Companies
- Plumbers and heating engineers
- London
- M&M Plumbing Expert Ltd
M&M Plumbing Expert Ltd
- Company number
- 11789869
- Incorporated
- 28 Jan 20197 years trading
- Registered office
- 871B Green Lanes,, London, N21 2QS
- Nature of business
- Plumbing, heat and air-conditioning installation
M&M Plumbing Expert Ltd is a 7-year-old private limited company registered in London, company number 11789869, one of 2,972 plumbing and heating companies in London. 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 £255 (+57.3%) on the year before, to £700.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £61K against £62K owed within a year: 1.0 times cover.
- 5 employees on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £700 | £26K | £61K | £62K | 5 |
| 31 Jan 2024 | £445 | £17K | £20K | £24K | 5 |
| 31 Jan 2023 | £2,188 | £19K | £23K | £27K | 5 |
| 31 Jan 2022 | £1,344 | £39K | 5 | ||
| 31 Jan 2021 | -£3,807 | £33K | £34K | £48K | 2 |
| 31 Jan 2020 | £448 | £1,025 | £1,491 | £1,567 | 2 |
Where M&M Plumbing Expert Ltd is registered
The registered office is in London (N21), in the Enfield local authority area, London. Show N21 2QS on a map.
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What happens if M&M Plumbing Expert 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 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
- 11789869
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 January 2019 (7 years ago)
- Registered office
- 871B Green Lanes,, London, N21 2QS
- 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
- 25 January 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.
- M&S Gas Ltd2026
- M.A Plumbing and Heating London Ltd2018
- M.B Plumbing Solution Ltd2026
- M.E.P. Technology Ltd2025
- M.J.O Plumbing & Maintenance Ltd2025
- M.O'R Heating Ltd2015
- M.P. Heating Solutions Ltd2021
- M.S Elite Plumbing & Heating Ltd2025
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are M&M Plumbing Expert Ltd's accounts due?
M&M Plumbing Expert Ltd's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is M&M Plumbing Expert Ltd'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 M&M Plumbing Expert Ltd still trading?
M&M Plumbing Expert 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 M&M Plumbing Expert Ltd do?
M&M Plumbing Expert Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is M&M Plumbing Expert Ltd?
M&M Plumbing Expert Ltd was incorporated on 28 January 2019, 7 years ago.
What is the penalty if M&M Plumbing Expert 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 M&M Plumbing Expert 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.