I think you need to change the whole current ethos of training that a five day course in something and a piece of paper gives anyone an understanding of how buildings work and how different services and structures interact.
The industry with its love of pseudo specialisation in the name of trade protection is to blame as very often on small jobs there is no one taking or competent to take overall responsibility for a job. Having an NVQ Level 1 in Squirty Foam Application is not a substitute for being able to build a house from working drawings and general principles.
And not enclosing a boiler flue or obstructing an air vent should not just be 'widely known' in whatever industry - it should be common sense - and that applies to the householder/client as much as the tradesperson.
The industry with its love of pseudo specialisation in the name of trade protection is to blame as very often on small jobs there is no one taking or competent to take overall responsibility for a job. Having an NVQ Level 1 in Squirty Foam Application is not a substitute for being able to build a house from working drawings and general principles.
And not enclosing a boiler flue or obstructing an air vent should not just be 'widely known' in whatever industry - it should be common sense - and that applies to the householder/client as much as the tradesperson.