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Like-for-like repairs — a mixer, a flush mechanism, an angle valve — generally need nothing beyond telling building security a contractor is coming. The moment work touches concealed pipework, drainage routes or anything structural, you enter permit territory. Chasing a wall to move a water point, relocating a drain during a bathroom renovation, or adding a washing machine connection where none existed usually requires a no-objection certificate from the owner or owners association, and in many Dubai master communities a fit-out or modification permit on top. Free zones add their own layer: Trakhees governs Nakheel communities such as Palm Jumeirah, the Dubai Development Authority covers others, and Abu Dhabi investment zones typically route through the master developer first.

Skipped permits surface at the worst moments: when you sell, when the building inspects after a leak, or when the downstairs neighbour's insurer asks who approved the pipework above their ceiling. Unapproved wet-area modifications are a classic reason handover inspections fail and deposits vanish. If a job involves opening walls or floors, ask the contractor one question before price: what approvals does this need, and who obtains them. A company that shrugs and says none is telling you it plans to skip them.

UAE tap water is desalinated and remineralised, and in most city networks only moderately hard. But it arrives warm much of the year, sits in storage tanks, and passes through heaters running at 50–60 degrees — ideal conditions for calcium carbonate to drop out of solution. The result is the white crust on every shower head in the country, mixer cartridges that seize years early, and heater elements wearing a mineral jacket that makes them work harder and die sooner. Where groundwater historically blended into supply — parts of Al Ain and the northern emirates — scale builds noticeably faster.

Scale is a safety issue, not just a nuisance. A scaled heater stresses its thermostat and pressure relief valve, the two components standing between a routine appliance and a tank of superheated water in your ceiling. Scaled isolation valves seize open, which you discover only during an emergency when you cannot shut the water off. The countermeasures are unglamorous: descale shower heads and aerators yourself, have the heater flushed and its element and anode checked every year or two, and replace seized valves before they matter. Whole-home softeners make sense for high-consumption villas; for apartments, disciplined heater and valve maintenance captures most of the benefit.

Most UAE apartments hide a horizontal electric storage heater above the bathroom's false ceiling — directly over your head, in a space nobody inspects for years. Heaters here live hard lives, and when one fails it either trips the electrics, quietly rusts through and drips onto the gypsum, or — the genuinely dangerous case — fails with a compromised thermostat and relief valve. Treating replacement as a grudge purchase to be done as cheaply as possible is exactly backwards.

A compliant replacement has non-negotiables. The unit should carry UAE conformity marking under the ECAS/EQM scheme administered by MOIAT (what people still call ESMA certification) — a legal requirement for heaters sold here, not a premium feature. The temperature and pressure relief valve must be new, correctly rated and piped to a safe discharge point, never plugged or left venting into the ceiling void. Expect labour and sundries for a straight swap around AED 250–600 depending on access and emirate, with the unit itself on top. Ask to see the old heater removed, ask what warranty covers the installation as distinct from the tank, and keep the receipt: if the installation causes damage later, that paper is the difference between a claim and an argument.