On 25/08/2012 12:11, Paul G wrote:
My garage is attached to the house with a 3-way lighting circuit.
Sometimes the family leave these lights on and this is only discovered
when someone goes outside and notices the fact. One of the light
switches is inside the house (next to an internal door into the garage)

Drill a hole in the door & insert a door viewer.

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Dave - The Medway Handyman www.medwayhandyman.co.uk