Certification & Accreditation

In order to deliver high standards of product quality and a great customer experience, we believe it is important to invest in people and process at every level of our business.

The certifications and accreditations below are a reflection of our commitment to continuous improvement, whilst developing our business in line with best practises.

Investors in People

At C3S we aim to achieve the very highest standards of performance throughout our business, which we achieve through our dedicated and experienced team.

Investors in People is a management framework for high performance through people.

This prestigious accreditation is achieved through rigorous and objective assessment to determine performance, which is why it is recognised across the world as a mark of excellence.

We optimise performance by championing best practice in people management and equipping our individuals with the tools to succeed.


Safecontractor is a leading health and safety assessment scheme, providing accreditation following comprehensive health and safety audits.

The certification further demonstrates our commitment to ensuring we follow best practises in Health & Safety, keeping our people and the environments they work in as safe and effective as possible.

ISO 9001 Quality Management

C3S has remained a market leader, not only by continuously improving and developing our people and products, but by continuously focusing on being the best we can be, at all that we do.

As the world’s most recognised quality management standard, achieving ISO 9001 accreditation supports our approach to providing a professional and premium client experience throughout our business.


We take every opportunity to ensure our clients can purchase with confidence.

Constructionline assesses suppliers’ information to a common, transparent standard, so that buyers can source and review relevant supplier information quickly and efficiently.

Removing the PQQ burden for its members and reducing costs within the procurement process, Constructionline is an additional certification supporting our strength and commitment to quality.

Local Authority Building Control

Our Home Living Units are fully compliant with current building regulations and are certified under the Local Authority Building Control (LABC) approval scheme – a not-for-profit membership organisation that represents all local authority building control teams in England and Wales.

Members must ensure that all buildings are habitable, safe, dry and warm as a minimum. So as well as helping fast-track Building Control sign-off when we deliver our modules; customers can rest assured that they are receiving a high quality, habitable solution.