Every landscaping mistake in the UAE is a decision made in winter. In December the climate is Mediterranean, everything at the nursery looks lush, and a big lawn seems obviously right. Design instead for the garden's worst week — mid-July, 46°C, 80 per cent humidity — and work backwards. That usually means shrinking the lawn to the area you will actually sit or play on, expanding shaded hardscape (pergolas, gravel, shade sails), and choosing plants from the proven desert palette: bougainvillea, frangipani, ghaf, neem, damas kept well away from pipes and foundations, and date palms as structure.
Irrigation is the buried half of the budget and the half that matters. A properly zoned system — pop-up sprinklers for turf on one valve, drip lines for beds and trees on others, all running off a programmable controller — costs more upfront but pays back in water bills and plant survival. Insist on a controller you understand, ask for the zone map, and have the installer walk you through changing seasonal run times before they leave.