On Airtasker, the average cost of a sliding door repair is $100 to $350. If you need complex repairs, replacement, or multiple sliding doors repaired, you can expect to pay more. The cost of installing a new sliding door can range from $40 to $60 per hour. This depends on the materials, location, and labour needed for the project. Be specific when posting your task to get the best quote for sliding door repair in your area.