Compare the exact finish, not just the colour
Ask to see the proposed outdoor porcelain product rather than choosing from a small screen image. Check its texture and request the manufacturer's information on suitability for wet outdoor use. A pale slab, darker joint and textured finish will each change the overall appearance. Look at a sample with the furniture and planting you intend to use.
Plan cuts around doors, drains and borders
Large slabs need a considered layout, especially in a compact garden. Ask where cut pieces will fall and how the installer will finish inspection covers, steps and the edge beside a lawn. A simple sketch can reveal awkward strips of paving before materials are ordered and help you compare alternative slab sizes.
Make the installation specification explicit
Request details of the proposed sub-base, bedding, bonding and jointing system, with installation suited to the chosen product. The quote should also explain finished levels and drainage. Where paving meets a back door, ask for the threshold detail to be explained separately so the desired appearance and practical water management are both addressed.
Understand the cleaning routine
Ask for care instructions for both the slabs and the jointing material. Leaves, soil and spills still need attention, especially around pots and shaded planting. Confirm which cleaning products and methods the manufacturer recommends, and whether leftover slabs can be retained for a future repair.