rights to light

[gubbadude]

1. Does an objection based on the right to light for a window have to be raised before building work commences? If not is there a limit to when an objection can be raised?

2. Would I be wasting my time if the window in question is a downstairs bathroom window?

[buildersmate]

1) If planning consent was involved, you had your chance to have your say during the consultation period. Even if you didn't write / object, the local authority has minimum guidelines for such things, so would have considered your position before granting planning permission.
If planning consent was not required, it is not required because central Government has set minimum distances for such things and the distance in question presumably exceeds the minimum (otherwise PP would have been required - QED)

2) In spite of all the above, you'd be wasting your time anyway if we are talking about a downstairs side-facing window in a non-habitable room. Neighbour (or you) could erect a 6 foot fence on the (near) boundary between the two properties and cut the light. That's why non-habitable rooms often face in this direction - light is not a necessity.