How much does a sliding door cost?

This depends on the type of sliding door, what features you need, whether it is installed by you or a professional as well as where you buy it from.

Here are some examples of the price of a single wall-sliding interior sliding door:

Products bought from a hardware store and installed by you:

Cover plate series 75 Flow (including the cover plate and soft close mechanism): EUR 150–200
Lightweight white 9×21 flush-panel sliding door: EUR 100–160
Installation: EUR 0
Total EUR 250–360

Whole package ordered from a manufacturer/carpenter including installation:

SAGA track system with the soft close mechanism: EUR 250–400
Pine veneer 9×21 solid wood door: EUR 300–700
Installation: EUR 400–600
Total EUR 950–1,700