Choosing appliances after the layout is set
One common sequencing problem is finalizing a layout before the exact appliances are selected. Cutouts, supports, ventilation openings, combustible clearances and utility requirements can vary by model, so generic appliance dimensions are not enough for final construction.
Purchase timing can follow the schedule, but current installation documents for the selected models should control the final enclosure and rough-in dimensions.
Underestimating utility planning
Gas, electrical, water and drainage requirements should be coordinated before the enclosure and surrounding hardscape make access difficult. Routes, shutoffs, service access, winterization and qualified-trade responsibilities belong in the plan before finishes close them in.
Do not oversize or improvise rough-ins simply for flexibility. Utility design should follow the selected equipment, applicable requirements and qualified trade work.
Decide Early Whether It's Covered or Open
A kitchen under a solid cover, beneath an open shade structure, or fully exposed can create different weather, lighting, clearance and ventilation conditions. Those relationships should be settled early enough that the exact appliance instructions can be checked against the proposed environment.
Skipping traffic-flow planning
A rendering can look balanced while the finished kitchen still puts guests in the cooking path. Plan the route from the house to prep, cooking, serving, seating and cleanup, including appliance doors and the space behind occupied seats.
Treating the kitchen as separate from the rest of the yard
The kitchen has to connect to seating, shade, patio elevations, drainage and circulation. If later phases are likely, sleeves, footings and access should be considered before the first finished surfaces block those routes.
The underlying pattern
Many avoidable conflicts come from locking the visual layout before appliances, utilities, site conditions and overhead clearances are understood. Resolve the technical constraints first, then refine the layout within those real boundaries.