A lot of the work needed to fit sliding doors is in preparation work, installing tracks and runners so that the doors can operate smoothly and continue to do so for years to come. Do allow time for this in your budget, as this will make up a good deal of the labour cost for the job.
If your tradesman is simply replacing existing doors then they should be able to fit on existing tracks, so all they will need is cutting to size and any other adjustment made before fitting can take place. The cost of the doors and any extras, such as new track or locks, will determine the final cost of the job. Your tradesman should make sure that everything works to your satisfaction before adding any finishing touches and tidying up after the installation.
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