Hi Jeff,
If the parquet is well bonded and not loose at all and is over a wood subfloor and not concrete, you can install a nail down floor right over it. If you want to install a glued down floor, remove existing finish first by sanding. Keep in mind, this is not optimal but possible as you would be relying on the bond between the parquet and subfloor. If you remove the parquet, you will damage some of the subfloor and need to fill, sand, and repair it. Sometimes removal is the only option. I have done jobs where the customer wanted 3/4" solid everywhere but had parquet glued down to the wood subfloor in an entry. Instead of sheeting the rest of the house with plywood to bring it up to the level of the entry parquet, it was less expensive to remove the parquet entry and repair that subflooring.
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