Buying hardware before checking compatibility
The imported thermostat that does not match UAE AC wiring, the lock that will not mount on an aluminium villa door, the curtain motor too weak for blackout fabric — all are avoidable with one photo sent to the installer before purchase. Devices bought abroad are also painful to return. Confirm fit first; the check is free.
Accepting a single bundled price
One lump-sum number hides where the margin sits — often a meaningful hardware markup on a single device. Insist on separate lines for device, labour, electrical work and network work. Vendors who quote in lines are also, reliably, the ones who have thought the job through.
Ignoring running costs at purchase time
Camera cloud subscriptions, hub-locked ecosystems and battery replacement schedules are the quiet second invoice. Over three years, subscriptions on a few cameras can outgrow the original install bill. Favour local storage where it fits your needs, and standardise on one ecosystem before the third device, not after the tenth.