If you’re using artificial grass on your installation for your lawn, it is best to compact your sub-base and laying course. Though installing an artificial grass usually is an easy process, failure to follow the necessary steps for the installation process will result to deterioration over time.
One is to make sure that you have removed the existing turf and excavate the required depth that your sub-base and laying course will occupy. Second, check whether your sub-base are stable that no water can penetrate through the voids. Third, follow the supplier instruction on how to lay the artificial grass. After doing so, allow it to settle.
If you’re using real grass, the answer may vary. Because of the compaction, the roots of the grass cannot deeply penetrate the soil because it removes voids and air pockets where the grass roots will grow. Compacting your grass will only create a shallow rooted lawn that will eventually be washed away by the rain.
If you want to make sure that your lawn is level, you can use a lightweight roller to slightly compact the soil and remove some air pockets but still allow your roots to grow.