There are several factors. Is it on a trailer or a slab? What dimensions? If it is on a slab, is it in an area where a permit is reqiured? What state is the project to be located in? We start around $3000 for a from scratch design. We have a few designs that you can start from and modify for a lower rate. If you have an idea of the size you are looking for we can give you an idea of the fee.