I often see advertisements for companies that state that they can do industrial, commercial and domestic work, stating that they are a registered competent person and showing for instance the NIC approved domestic person logo. This basically means that they are only competent to carry out work in a domestic premises and this is all they have be assessed for. This doesn’t mean that are competent to carry out industrial or commercial work.
Many people are fooled into believing that a registered competent person can do all types of work, you need to be looking for an approved contractor and not a domestic approved contractor. Unfortunately from lack of knowledge and experience they tend to be cheaper, and until something goes wrong customers are blissfully unaware. Unfortunately, most customers are only interested in the bottom line not if the company or individual have the experience and the expertise to do the job. Which in our current climate tends to be the norm.