Look for a landscape architect near you. S/he will either have an independent business and consult to various landscape companies and/or home owners, or may work directly for a larger or higher end landscape company.

I would think plenty of landscapers design and build, no?

bump

We built a new addition. It ripped up the grass/sod. We now think we want a new garden plus pool. Ideally, I don't want a landscape design concept that I then have to go off and locate someone to build. Are there companies that design and do the construction? What is this service called?