Mark Group solar customers
Mark Group solar panels ten years after the 2015 administration
Mark Group Limited, based in Leicester, was one of the biggest names in home insulation and solar panels until it went into administration in October 2015, when the BBC reported 939 redundancies. Its solar PV systems are now around ten years old or more. If one is on your roof in North Wales, the Wirral or Cheshire, our Colwyn Bay team can look after it.
Call EcoShell on 01492 550 086
Free home visit across North Wales, the Wirral and Cheshire.
What happened in 2015
Administrators from Deloitte were appointed on 7 October 2015. The administration ended in April 2019 and the company was dissolved on 23 September 2025.
Mark Group: key facts
| Company | Mark Group Limited, company number 01304470 (Mark Insulations Ltd until 2007) [1] |
|---|---|
| Closure | Administration from 7 October 2015 (Deloitte); ended 2 April 2019; dissolved 23 September 2025 [2] [3] |
| Head office | 70 Boston Road, Beaumont Leys, Leicester LE4 1AW [3] |
| Jobs | 939 redundancies reported when it went into administration [4] |
| Name reused | A separate company later traded as "Mark Group" for insulation (Gazette prohibited-name notice, November 2015) [5] |
Sources (checked 11 November 2026): [1] Companies House: company 01304470; [2] Companies House: insolvency; [3] The Gazette: appointment of administrators, 12 October 2015; [4] BBC News, 8 October 2015; [5] The Gazette: re-use of a prohibited name, 3 November 2015.
EcoShell is not connected with Mark Group, its administrators or the later company using the Mark Group name. We are an independent solar PV business in Colwyn Bay.
Not the later "Mark Group"
After the administration, a separate company traded under the Mark Group name for insulation work. It is a different business and has nothing to do with looking after solar PV systems fitted before 2015.
Ten-year-old systems
Energy Saving Trust guidance is that inverters typically need replacing every 10 to 15 years, so an original Mark Group inverter is now well into that range. We check whether yours can be repaired before suggesting a replacement, and you get the cost first.
"Ten years is a long time for an inverter. Let's check it before it lets you down."
Where we visit
We look after former Mark Group systems across:
- Colwyn Bay
- Rhyl
- Bangor
- Wrexham
- Chester
- Wirral
Questions from Mark Group customers
Is Mark Group still trading?
No. Mark Group Limited (company 01304470) went into administration in October 2015 and was dissolved in September 2025. EcoShell is not connected with it.
Is the company now trading as Mark Group the same firm?
No. After the administration a separate company traded under the Mark Group name for insulation work. It does not look after solar PV systems fitted before 2015, and EcoShell is not connected with it.
Can you replace the inverter on my Mark Group system?
Yes, if it needs it. We test it first, tell you whether a repair is possible, and give you the cost before any work starts.
Related EcoShell pages
Solar PV fault? Call our Colwyn Bay team
Call EcoShell on 01492 550 086
Our Colwyn Bay team covers North Wales, Anglesey, the Wirral and Cheshire.