If you enclose your lanai, I don't think you need to bring the floor level up to the house level unless you are attaching it to the existing HVAC central system. If so, you also need to make the lanai comply with all building codes, such as adding electrical outlets, additional insulation, etc. But, if you are going to enclose the lanai and you just want to level the floor, it makes sense to me to consider raising the floor level to match the house because I believe it will increase the function and value of the house.
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