Using poured footing pads and concrete block piers is cheaper because there is no forming of piers on a concrete pad. Same strength and no difference except that setting bolts in individual piers can be easier to schedule.
Pouring concrete requires forms, stripping forms and moving them out that makes scheduling difficult.
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Thats a hard one to answer. Many different variables there. Factoring everything in i would say a slab house would cost more. Installing HVAC, Plumbing and electrical is much easier with a decent crawlspace. Also, any WDO/WDI treatments will cost more for a slab home. Slab homes are more susceptible to flooding damage making insurance rates higher.
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