It depends upon the type and brand you choose. Playhouses can surely be an expensive investment, but there are varieties to suit every budget. Its cost may range from a few dollars to several hundred dollars. For example, wooden varieties are quite expensive, but they will come at a lower cost if you spend on a metal or plastic one. So, it totally depends upon the kind of playhouse you go for. They can be cheap or expensive based on their material, construction, size and more factors.