The average hourly cost of gazebo design and construction is approximately $50-$100 per hour. The cost breakdown may include the cost of materials, labor, and any additional fees for permits or other services. Factors that may affect the cost include the type and quality of the accessory, the complexity of the job, and the location and service provider. The type of accessory may include different types of materials such as wood, metal, or vinyl, and the quality of the material may affect the price. The complexity of the job may include the size, shape, and complexity of the gazebo, and the location and service provider may also affect the cost due to factors such as access, availability of materials, and the cost of labor.