Join Date: Mar 2012
Location: Vancouver, BC
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Re: Installing a traditional head from scratch
Haven't done the actual toilet end, but have now retrofitted a few holding tanks into direct overboard discharging boats.
Total cost of materials was about 800$ IIRC for a small boat, but that included a fancy Jabasco all in one holding tank(Macerator pump, tank level monitor, control pad etc.) Big advantage of that is that it confines everything within a small footprint, and you only have to securely mount one thing.
Often if you scrounge around at West Marine etc and keep an eye out, cut lengths of hose that aren't picked up go up for sale cheap, hose is very expensive at full retail.
If your boat has never had one, I'd think about getting the same size thru-hull as your sink, then you can use the size hose, hose clamps etc, and buy a larger quantity to do a couple projects at once.