A few things to consider:- VA loans require the home meet a set of minimum property requirements ensuring the home is safe, sanitary and structurally sound.

I would also be sure to err on the side of caution when doing your math and assume a 25% vacancy to ensure you can cover the loan and operation of the building if times run thin for you, that way you will easily withstand the 10% norm (or whatever it is in your area).

I want it to ensure it covers dwelling, home protector, fair rental value, personal liability, and medical payments.  

You will also need to ensure you stay within the 5 year window for the tax exclusion, if it doesn't sell fast enough, you could miss out.

The property owner must ultimately ensure that the property is safe for visitors.

This uncertainty would ensure very few market participants.

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@Francisco Feliz yes you can totally do it yourself but I recommend spending a little extra to ensure its all done correctly and you can get support at any time from them.

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I'm the builder, so that's not an issue...the plumbing contractor will be happy to come back, but I want to ensure that I have a reasonable idea of the issue first (since it's not easy to reproduce).A couple things to point, since it sounds like it could impact your analysis above (or maybe not):- It only happens in one sink, which sits between two other fixtures (another sink and a tub).