Answer
Will I have the same team throughout the project?
Yes; the people who design it build it, one accountable team from first visit to handover.
In short
Yes. As a design-and-build firm, the people who design your garden are the ones who build it, so there is one accountable team from first visit to handover and nothing is lost in a handover between firms. That continuity is the whole point of design and build.
Arrange a consultation
Send a few photographs and a sentence about the site. We will reply personally.