How to verify a fitter is legitimate: licences, premises and paper trail
Tyre fitting is licensed trade activity in every emirate. A fixed workshop holds a trade licence from the local economic department covering tyre repair and sales, plus civil-defence compliance for the premises, since a building full of stacked rubber is a serious fire load. A mobile fitting operation is typically the outreach arm of a licensed workshop, running vans under the same commercial licence. The verification questions are short: what is the licence name and number, which emirate issued it, and does the invoice you receive carry that trading name with a TRN for VAT. A provider who cannot produce an invoice with a tax registration number is operating informally, and you have no recourse when something goes wrong.
A last practical check is behavioural rather than bureaucratic. A competent fitter uses a torque wrench for final tightening rather than hammering the impact gun to maximum, resets or checks the TPMS after the job, sets pressures to the placard on your door jamb rather than a generic number, and tells you unprompted to re-check torque after the first 50 to 100 kilometres. Any one of those habits is a good sign; all four together mean you have found your regular, and same-vendor rebooking exists for exactly that moment.