Leaking through light fixture, builder says I don’t have to replace light?

Could have problems in the future. I would not take the word of a builder about electrical work though. I would be inclined to call an electrician in to have a look and advise.

Get them replaced. Water damage can cause issues in time with corrosion occurring months down the line. Insist that they are changed.

This all depends on how the circuit supplying the light fixture is protected. If there is water damage to the fitting, but the lighting isn’t protected by a 30ma RCD, a requirement for most new installations these days, a low IR could be masked by the protective device. Also,if there has been water ingress of the internal lighting wiring and wiring supplying the light, the life of the insulation could also be reduced. The simple answer is who knows - if you ask a qualified and registered electrician to test your installation, they will be able to ‘megger’ the cables and light fitting by passing 500V through the cables, giving an accurate picture of wether or not you will have problems in the future.

If they are working OK then you should be fine, but if you are not happy, ask an electrician to come and have a look and see what they say. They should remove each fitting and check their safety and give you the relevant advice.

You could have a problem with the connections corroding in the future due to being in contact with water. Would strongly recommend replacing

If it were my home i would insist they were replaced and everything checked

If there’s no corrosion and the lights didn’t short, once they are dry and working the should be fine, the only issue might be a cosmetic one, but if they look ok there’s no need to replace them.

Often even a small amount of water can leave corrosion behind on conductive parts, sooner or later this will cause a high resistance fault. If none of the conductive parts (metal) came into contact with any water this won’t be a problem but if water actually flowed out of a fixture it is unlikely that the light would be completely unaffected, I’d probably replace it as a matter of course. Saying that if an inspection revaeals absolutly no water damage on the conductive parts then perhaps replacing the light might be over cautious, caution however hardly ever causes problems.