Creating navigational path

I have a question about information architecture regarding the redesign of a small (50 page) professional services B2B site. This client will have about 15-20 pages on their different services which all relate to managing energy. You can buy individual elements of their service such as procurement or go for the full service bells and whistles. I haven`t finished working out the journeys that the different audiences will take as yet but as its quite a simple site I`m wondering if there is value in adding folders to create a hierarchy or whether I`m just as well keeping all service pages at the top level of domain.com/service1 and domain.com/service2 etc. It doesn`t make sense to divide the services by type of energy eg electricity, water, gas etc as the service is exactly the same. I`ll have a navigational path for that journey but I`m thinking of the IA at the moment. Just for context, I`m a lone consultant now having sold our digital marketing agency 2 years ago. I miss my hugely talented team who I could ask my dumb questions to so I really appreciate being in this group where I know the advice is always exceptional.