Oct 30, 2023 · Quicklinks: 5 Reasons Why You Shouldn’t Convert a Freestanding Grill to Built-In. 5 Potential DIY Built in BBQ Grill Ideas with Detailed Pros & Cons. A DIY Built in Grill Idea that’s Meant to Last a Lifetime. Not All Grills are Built-In. First, we have to clarify some terms. You’re interested in a built in grill DIY, right?