Light shaft defective. Problem due to existing groundwater?

Hello everyone,

together with our developer Interhomes, we are currently building a single-family house. The handover is planned for no later than 31.05.17. When I recently looked into our light well systems, I discovered a hole at the bottom of one of these:

The house is located in an area with a high groundwater level and must meet high requirements regarding basement waterproofing based on the soil survey report. Now my question(s): (Not only) considering the handover date, there is still theoretically time to completely replace the light well system. However, this would mean a new (risky ??) attachment to the "white tank" with the corresponding (critical ??) sealing between the light well system and the "white tank." Would it possibly be better to have the defect "patched"? Or would you demand a replacement from the developer?

Thank you very much!

I would first report the defect and demand remedy, then see what is offered.

If you have a [Weiße Wanne] and you also need it, I would tend not to want to make compromises.

As far as I can see, the light switch is connected to the drainage, so the water will drain anyway. Your basement definitely won’t become leaky because of that, so don’t worry. Report it and see what they offer you.

Thank you very much for your assessments! The acceptance is next Friday. The site manager responded to our complaint by email, stating that he assumes the defects will be fixed by then. Yesterday, that was not yet the case. However, the terrace has already been paved around the affected light well...!??
I will report!

Best regards!