Slabs are ideally suited for use in dry arid regions and can also be used if desired when building on bedrock. In our area I don't think their the best option unless the buyers really require no steps into their home. In our area I prefer crawlspace foundations as the best alternative.
Both of the preceding answers are correct however, I would like to point out that I have seen termites with slab homes and sometimes they are harder to spot. Since with a slab home there is very little of the "slab visible it is a short trip for the termites to create their tunnels and access the actual walls of the home. Once inside they will destroy a home from the inside out. Now the same can be said of any home slab or crawl space. If you simply have a pest control company come out and give you a termite bond you can protect your home and they will periodically come out and inspect and treat if necessary your home thereby maintaining the value.
A slab home is less expensive to build but will give you or any other owner some problems if you chose to renovate or change any part of the home with plumbing. Since the drains are all in the slab that you mean a contractor would have to come in and break up the slab to access or change any drain lines.
Hope this helps,
Slab construction and crawl space construction.
The most important thing with a crawl space type foundation is to make sure it was installed properly to begin with. Different types of soils and grades of lots make it important to waterproof properly, prep ground under home and getting the grading right is a must. Some crawl spaces provide some storage. Not for wood though. Lol.
Termites are active in NC. Easy access under the home is the best part of a crawl space and the height if the home off the ground. Some older people may prefer a lower entrance door.
Slabs seem to be very energy efficient but can seem hard with out correct flooring and padding. But, no moisture issues under home like a crawl space could have. As long as the slab was installed correctly and has no major cracks after settling, it is a good set up. There are many different types of slabs like raised slabs and slabs with brick or stone veneer.
I have been in real estate for 17 years and personally had a building company. I represent Lats of buyers when building new homes.
Call or email if you have more questions.
Both types of foundations are common and good construction. They do have some cost differences.
David Owens. 919-291-4167
As far as from a build point of view, I find that people who suffer from any kind of foot, hip or knee ailments prefer crawlspace construction as they claim walking on a concrete based floor bothers them more. From any type of repair issue, being able to get to your water or septic pipes without breaking through a floor is easier with crawlspace construction plus crawlspace allows a home to breath better. Crawlspaces if large enough also add storage space for items such as lawn & garden tools, window screens during the winter months, bicycles and items not prone to being damaged by moisture.
The plus side of slab besides saving dollars at purchase is that in NC, we are known for termites. I don't see as many termite issues with slab as I do with crawl spaces mainly because all areas accesible to wood products of a home are more easily viewed. Very few people take the time to have their crawl spaces inspected on an annual basis.