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.
For the design-and-build itself, most villa owners do best splitting the job: a paid design consultation (roughly AED 200–600) to get a planting plan and irrigation layout, then competitive quotes on the installation. In master-planned communities under Dubai Municipality or developer rules, pergolas, decking and boundary changes typically need an NOC from the community management before work starts — a good contractor will handle the paperwork, a bad one will pretend it does not exist.