Average Hourly Cost: The average hourly cost for window grille installation in the window installation service category is approximately $50-$75 per hour.

Cost Breakdown: The cost breakdown for window grille installation typically includes the cost of materials, labor, and any additional services such as window cleaning and painting.

Factors Affecting Cost: Several factors may affect the cost of window grille installation, including the type and quality of the accessory, the complexity of the job, and the location and service provider. For example, higher quality materials and more complex installation jobs will cost more than lower quality materials and simpler installation jobs. Additionally, the cost of window grille installation may be higher in certain geographical locations or from certain service providers.