We’ve worked hard over 40+ years to earn our reputation for quality worksmanship and approachable service. As such, these certifications and accreditations are a key part of the foundations our team proudly build on. Together with our experience, quality tooling and machinery, they allow us to deliver predictably and safely for you.

Our certifications and accreditations let you know your in safe hands.

Please feel free to click on the icons below to view the associates documents:

BSI Assurance Icon
Constructionline Gold Member
Cyber Essentials Certified
Safecontractor Certification
JOSCAR Registered
Acclaim Icon


N J Slee are fully certified by BSi to ISO 9001:2015 which is the international standard for Quality Management and ensures that all business processes are effectively managed and documented. This includes the implementation of tools systems to measure and continually improve the quality of services provided.

With this in place we can ensure we can satisfy our customer’s needs as well as accomplish our mission statement.

The company is also fully certified by BSi to BS EN 1090 – 1 + A1:2011 – Execution of all steel and aluminium structures.

The manufacture (including welding) and installation of structural works in all steels and aluminium up to and including Execution Class 3 (EXC 3) as defined in EN 1090 – 2.

It is now a legal requirement for companies undertaking structural steel works including Building Structures, Walkways, Handrails, etc to be certified to this standard


Health, Safety and Environment

N J Slee Welding and Fabrication’s commitment to the health and safety of its employees is every bit as important as the excellence of our products, outstanding service and respect for individual customer needs. However, we feel there must be no compromise with safety, therefore we strive to ensure so far as is reasonably practicable, the health safety and welfare of all people involved in any project. We have an Integrated Management System (IMS) which is rigidly adhered to and also includes provision for environmental protection and for the protection of plant and equipment. On top of this and on a project to project basis we develop Method Statements as well as Risk and COSHH Assessments to give further assurances that the works will be carried out in the safest and most environmentally friendly manner. Copies of our Health, Safety and Environmental Policies can be made available on request.