Director Jason Lock said of the move: "Now we will not have workers twiddling their thumbs because the ground is sodden. It's not our problem anymore.
"A higher turnover of jobs and lower entry point for customers gives us greater flexibility. We're looking to be more like an architectural practice."
He added: "Design and build can control a lot of things but is at the slight mercy of the market. Luckily, we chose this route before the housing market softens.
"Construction is feast and famine. There's a lower entry point for design work, so there is a more stable market."
Notcutts already has design offices at its garden centres in Woodbridge and Solihull, and the company aims to open offices at all of its garden centres.