Buying a new light fitting and hanging it is something most homeowners can do without calling in an electrician.
But installing a downlight is a different matter, mainly because of the heat it can generate in an enclosed space.
"Building code compliance was never a problem when the light fittings were simply fitted on to, or hung below the ceiling," says Tony Conder, manager of the Building Research Association's education and information services.
Ceilings, he says, prevent the passage of water vapour to the roof void, provide thermal or sound insulation and fire separation. They also include structural components.
"Once a light fitting is introduced into the ceiling, as opposed to being simply fixed to it, that fitting becomes part of the ceiling and must not diminish the ceiling's functions."
The principal concern is fire risk, especially from halogen lights which generate considerable heat and should have a gap between them and wooden structures above in the roof void.
A recessed lights code of practice for manufacturers and electricians is proposed for introduction next year.
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