Yes, you need an inspector right away. Start interviewing inspectors now, and compare services. Ask them to explain why they do the inspections they propose, and how they will coordinate with the builder. Do not rely on local municipal inspectors - they normally only look for building code violations, and they may not catch all of them. Your building inspector should also be looking for design problems and construction that does not follow the plans you agreed to. Windows may be placed in the wrong location or be the wrong size, or HVAC vents may be placed in inconvenient ares, like the middle of a room or in front of a door to name just a couple of problems that a county inspector may not look for.
In addition to the normal inspections of "vertical" construction, ask about getting certification from a geotechnical engineer that the earthwork is compacted properly and that no unsuitable fill material was placed under the slab. If this is a small lot, prior to pouring the slab, you should ask for a surveyor's certification that the pad does not encroach on any building setbacks and easements. If organic material or trash is buried under the slab, it will eventually sink, leading to cracked walls or even structural failure. If the slab is built over a setback line or in an easement, the builder may not be able to get a certificate of occupancy, or you could inherit liabilities in the future.
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