A letter appointing a professional consultant on a construction project. A short form of appointment, suitable for use where the professional consultant's services are straightforward or of low value, and the project does not relate to a higher-risk building as defined in building safety legislation.

For example, the letter could be used to appoint an architect, structural engineer, mechanical and electrical engineer (also known as a services engineer), project manager or other professional.

For a longer form professional appointment, see Standard document, Professional appointment.