Hello, I'm a mortgage professional.
There are two types of 203k loans.
If you are spending less than $35,000 on renovations you generally will not need an FHA inspector at all. If you spend over $35,000 an FHA inspector is required.
A home inspection is not required to get a mortgage however it is something that is generally recommended.
If the home has a well and a septic system FHA may require an inspection on those.
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If you have any other questions or need help with this you are welcome to contact me.