- Companies
- Plumbers and heating engineers
- London
- Mars Plumbing & Heating Limited
Mars Plumbing & Heating Limited
- Company number
- 13837847
- Incorporated
- 10 Jan 20224 years trading
- Registered office
- Flat 7 Robert Owen House, Progress Way, London, N22 5RN
- Nature of business
- Plumbing, heat and air-conditioning installation
Mars Plumbing & Heating Limited is a 4-year-old private limited company registered in London, company number 13837847, 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.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Mars Plumbing & Heating LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 down £24K (-41.3%) on the year before, to £34K.
- Current assets of £43K against £15K owed within a year: 2.9 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £34K | £43K | £15K | 2 | |
| 31 Jan 2024 | £58K | £104K | £53K | 2 | |
| 31 Jan 2023 | £25K | £54K | £38K | 1 |
Where Mars Plumbing & Heating Limited is registered
The registered office is in London (N22), in the Haringey local authority area, London. Show N22 5RN on a map.
Other trade companies in N22
- Don Baker's Maintenance LtdFinishing trades
- Vale UK Homes LtdPainters and decorators
- Tradepeople LtdGroundworks and demolition
- Cool As A Cucumber LtdProperty developers
- Begkolli LtdInstallers
- Zeematics Market LtdPainters and decorators
- Heat Edge LtdPlumbers and heating engineers
- Integrity Contractor LtdBuilders
What happens if Mars 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 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
- 13837847
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 January 2022 (4 years ago)
- Registered office
- Flat 7 Robert Owen House, Progress Way, London, N22 5RN
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 10 October 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 London
Other active plumbing and heating companies registered in London.
- Marsh Plumbers Ltd2024
- Marson Engineering Ltd2010
- Marta Plumbing Limited2022
- Martstar Limited2024
- Marylebone Plumbing,Heating & Gas Ltd2025
- Maryo Auto Ltd2026
- Marz & DMS Ltd2026
- Masivia Aircon Fittings Ltd2026
All plumbing and heating companies in London · All trades in London · Plumbers and heating engineers across the UK
Frequently asked questions
When are Mars Plumbing & Heating Limited's accounts due?
Mars Plumbing & Heating 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 Mars Plumbing & Heating 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 Mars Plumbing & Heating Limited still trading?
Mars 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 Mars Plumbing & Heating Limited do?
Mars Plumbing & Heating Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Mars Plumbing & Heating Limited?
Mars Plumbing & Heating Limited was incorporated on 10 January 2022, 4 years ago.
What is the penalty if Mars 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 Mars 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.