NICEIC is a leading UK organization that assesses and certifies the competence of businesses undertaking electrical work, holding government approval to offer Competent Person Schemes for electrical work under Part P of the Building Regulations in England and Wales. Beyond electrical, it also certifies companies in plumbing, heating, and renewables, overseeing approximately 38,000 businesses and serving as a significant industry training provider.

Operating as Certsure LLP, NICEIC is owned by the charity Electrical Safety First and the Electrical Contractors’ Association (ECA), having been formally incorporated on August 10, 1956, evolving from an earlier register established in 1923. Businesses achieving certification, such as "Approved Contractors" or "Domestic Installers," must adhere to rigorous standards, including the BS 7671 IET Wiring Regulations and specific insurance, ensuring high-quality and safe work. This commitment to standards means that if a certified business's work is not up to standard, NICEIC will correct it, making its certified businesses often preferred by local authorities.