- Companies
- Plumbers and heating engineers
- Cardiff
- MMK Mechanical Ltd
MMK Mechanical Ltd
- Company number
- 12838006
- Incorporated
- 26 Aug 20206 years trading
- Registered office
- 35 Blackberry Way, Pontprennau, Cardiff, Caerdydd, CF23 8FE
- Nature of business
- Plumbing, heat and air-conditioning installation
MMK Mechanical Ltd is a 6-year-old private limited company registered in Cardiff, company number 12838006, one of 170 plumbing and heating companies in Cardiff. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £23K (+13.8%) on the year before, to £187K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £242K against £79K owed within a year: 3.1 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2021 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £187K | £242K | £79K | 1 | |
| 31 Mar 2025 | £164K | £227K | £85K | 1 | |
| 29 Aug 2024 | £80K | £121K | £46K | 1 | |
| 31 Aug 2023 | £50 | £8,526 | £8,809 | 1 | |
| 31 Aug 2022 | £56 | £8,338 | £8,782 | 1 | |
| 31 Aug 2021 | £892 | £7,002 | £6,026 | 1 |
Where MMK Mechanical Ltd is registered
The registered office is in Cardiff (CF23), in the Cardiff local authority area, Wales. Show CF23 8FE on a map.
Other trade companies in CF23
- Ellisp LtdSpecialist contractors
- J & J Grounds & Buildings Maintenance LtdLandscapers and gardeners
- Halo Mobile Specialists LtdMechanics and garages
- 1ST Choice Accident Repair Centre (Yeovil) LtdMechanics and garages
- Wide Transport LtdMotor traders
- Ace Windscreens LtdMechanics and garages
- Lex Roofing Solutions LtdRoofers
- Taxissories LtdMotor traders
What happens if MMK Mechanical 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 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 12838006
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 August 2020 (6 years ago)
- Registered office
- 35 Blackberry Way, Pontprennau, Cardiff, Caerdydd, CF23 8FE
- 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 2026
- Last confirmation statement
- 19 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 Cardiff
Other active plumbing and heating companies registered in Cardiff.
- MPH Installations Ltd2018
- MR Builder MH Ltd2024
- Multi-Fix Property Maintenance Ltd.2025
- N J Harkus Plumbing and Heating Limited2013
- N.E.C. Plumbing and Heating Limited2005
- Nationwide Retrofit Ltd2014
- North Plumbing and Heating Cardiff Ltd2023
- Nova Plumbers Ltd2024
All plumbing and heating companies in Cardiff · All trades in Cardiff · Plumbers and heating engineers across the UK
Frequently asked questions
When are MMK Mechanical Ltd's accounts due?
MMK Mechanical Ltd's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is MMK Mechanical Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is MMK Mechanical Ltd still trading?
MMK Mechanical Ltd 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 MMK Mechanical Ltd do?
MMK Mechanical Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is MMK Mechanical Ltd?
MMK Mechanical Ltd was incorporated on 26 August 2020, 6 years ago.
What is the penalty if MMK Mechanical 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 MMK Mechanical Ltd 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.