"Are there any extra checks needed other than by the manufacturer?"
ANSWER
Not always. According to the Machinery Directive 2006/42/EC Annex IV, if the lifting height (travel) of a vertical lifting platform exceeds 3.0 metres, the platform lift must either:
Be EC type tested and certified by an accredited European Notified body OR
Fully comply with the harmonised standard EN81-41 OR
The manufacturer must have a quality assurance system, such as ISO 9001, approved by an accredited notified body, which covers both product development and manufacture.