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It sounds high to me, but would depend somewhat on if the sewer pipe is in and in the proper place and if the water supply is already in. Breaking up concrete is heavy work that takes lots of time. Doing the plumbing is not that tough with today's plastic DWV piping--you need to vent everything properly and have some slope on the drain lines. It will involve cutting some holes in the roof and drilling through walls and framing. Doing the supply lines with copper pipe is not hard, once you learn to sweat fittings decently. And lots of construction now is done with special flexible plastic supply lines, which I have not worked with, yet. Maybe the next house I build or rebuild. Doing plumbing takes some time and skill. I think most people with average ability can do most house plumbing, assuming the codes in your area do not require a licensed plumbing contractor. It takes some time to plan how you are going to build the systems, some more time to buy the necessary component parts, some more time to learn how to cut the right lengths of pipe and make decent joints, and a bunch more time to actually connect everything and make sure you don't have any leaks. Only you can decide if you are capable of doing the rough in plumbing and if you have the necessary time. Undoubtedly you can save some money by doing it yourself, but it depends on how much your time is worth. From my experience, it takes lots more time to do things myself than if I paid to have someone else do them. A professional should be able to gaurantee a properly built system with no leaks and to be done with the jobs by a particular date. To be able to do that costs money. You might see if anyone you know knows someone that does plumbing construction. Sometimes construction workers take side jobs to do in their off time. But forget about a guarantee. You also might invite some other companies to bid the job. But the lowest bid is not always the bid to take... Good luck!
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