Think if a 1930s wood frame pier and beam house burns to the ground. You might not replace it with the same type.....maybe now brick, different appliances, different electrical, etc. Might be 2x or 3x replacement costs.
Brand new neighborhood where builders are still building....maybe you save the slab and rebuild....maybe 80%
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They utilize an appraisal software package and need to know specific things about the home. Exterior (Fram/Brick/Stone/Stucco) interior features such as low quality construction to custom kitchen, bathrooms and other specific upgrades that the home you have features.
The cost to rebuild many homes is higher than market value in many areas of Texas.