The cost of building a cat shed can vary widely depending on a number of factors such as the size, materials used, location, and any custom features you may want to include.

A basic, small cat shed can cost anywhere from $200 to $500. This would typically include a simple, sturdy structure made of wood or PVC with a roof, basic insulation, and a floor. You may also want to add a door and windows to provide ventilation, but these are not essential.

If you want a larger cat shed or one that is more elaborate, the cost can increase significantly. For example, a medium-sized cat shed that is well-insulated, weather-resistant, and equipped with amenities such as shelving, a litter box, and a scratching post can cost upwards of $1,000.

Another factor that can impact the cost of building a cat shed is the materials used. A wooden cat shed will likely cost more than a PVC one, while a shed made of more expensive materials like cedar or redwood will be even pricier.

Additionally, if you want to add custom features like a heated floor, air conditioning, or a special lighting system, the cost can go up. For example, installing a heating system in a medium-sized cat shed could add an additional $500 to $1,000 to the overall cost.

Finally, the cost of building a cat shed can also vary depending on your location. In some areas, the cost of labor and materials may be higher, which can drive up the overall cost of your project.

In conclusion, the cost of building a cat shed can range from a few hundred dollars for a simple, small structure to several thousand dollars for a more elaborate, custom-built one. The best way to determine the cost of your cat shed is to get quotes from a few contractors and compare the options available to you.