ISO Accreditations

ISO 27001 Logo

ISO 9001

Indigo is certified to ISO 9001:2015 and through the Quality Management System, have developed processes that create and systematically control the products and services on offer, thereby ensuring the needs and expectations of customers and partners are met.

ISO 27001 Logo

ISO 14001

We are certified to ISO 14001:2015 and through the Environmental Management System, have a systematic way of identifying and controlling the effects the company has on the environment challenges.

ISO 27001 Logo

ISO 27001

Indigo is certified to ISO 27001:2013 and through the Information Security Management System, are committed to implement and maintain systems to protect information and data, assess security risks and threats and ensure effective business continuity processes.

ISO 27001 Logo

ISO 45001

We are certified to ISO 45001:2018 and through the Health and Safety Management System, are committed to implement, maintain and continually improve an effective safety culture to promote a safe and healthy working environment and achieve better occupational health and safety performance.


Safe Contractor

We are certified to SafeContractor which recognises very high standards in health and safety management. We’re committed to sustainable and ethical practices

Cyber Essentials Plus Logo

Cyber Essentials Plus

Indigo through Cyber Essential Plus has implemented the required controls to ensure good cyber security practice and protect the company against cyber threats. The scheme was developed as part of the UK’s National Cyber Security Programme and is mandatory for central government contracts.

Investors in People Logo

Investors in People

We were awarded Investors in People in 2019 and were honoured with a Gold certificate which we consistently maintain each year. Gold accreditation means that we have the policies in place but more than that, it means everyone takes ownership for making them come to life.

ICO Logo


Indigo is registered with the Information Commissioner’s Office under registration number Z1741062, and the independent authority upholds information rights in the public interest and data privacy.



Indigo has been assessed as having the technical capability to carry out electrical installation work in accordance with the requirements of BS7671 (IET Wiring Regulations), except in potentially explosive atmospheres.

CHAS accreditation logo


With our CHAS accreditation we strengthen our supply chain compliance, mitigate risks and support efficient supply chain management.



Indigo belongs to the top 5% of all evaluated companies to achieve gold status in EcoVadis rating.

Registered Waste Carrier Logo

Registered Waste Carrier

Indigo is registered as a Waste Carrier with Natural Resources Wales under registration number CBDU2098, and the duty of care aims to protect the environment and human health.

Prince2 Logo


Indigo project teams are certified practitioners under Prince2.



Indigo engineering teams are certified to NRSWA.

ECS Logo


Indigo engineering teams are certified to ECS.

2021_RoSPA Gold Award

RoSPA Gold Award

Indigo (trading as 4site) has been awarded the prestigious Gold award by Royal Society for the Prevention of Accidents (RoSPA) for outstanding health and safety practices.

Armed Forces Covenant Supporter LOGO

Armed Froces Covenant Supporter

Indigo is committed to being an Armed Forces Friendly company and we are very proud that we not only employ a number of ex-service personnel right across our business, but we will also offer real support to employees who have chosen to volunteer to serve in the Reserve Forces.

RECI Certified Logo

RECI Certified

Indigo (trading as 4site) is a RECI (Register of Electrical Contractors Ireland) company and we hold safety as an essential part of our service.

Engineers ireland logo

Engineers Ireland CPD Accredited Employer

Indigo has been accredited by Engineers Ireland in recognition of the quality of, and commitment to, its Continuing Professional Development (CPD) systems and practices for engineering and technical staff.