Hidden water leak detection in Al Mrwj, Riyadh: before buying or handover

Prepared by the technical team · editorial review · last updated 13 November 2026 · Sources

Before we start: what we know about Al Mrwj

The centre of Al Mrwj is at 24.7578, 46.6637, about 5 km from the centre of Riyadh, with an approximate radius of 2.1 km. The approximate area shown on the map is centred here. The nearest wadi channel is about 2.8 km from the centre of Al Mrwj (OpenStreetMap).

Main roads in or near Al Mrwj: King Fahd Road, Northern Ring Road, King Abdulaziz Road. The centre of Al Mrwj sits about 635 m above sea level (SRTM open elevation data).

Al Mrwj has both villas and apartment buildings.

Al Mrwj sits in the northern part of Riyadh, roughly 5 km from the city centre, and its buildings are mostly villas and apartment blocks. The area lies about 635 metres above sea level, and the nearest wadi channel is around 2.8 km away. Major routes such as King Fahd Road, the Northern Ring Road and King Abdulaziz Road run in or near the district, which means many buildings here are close to heavy traffic and frequent construction.

For a hidden leak check in this setting, the first thing we look at is the water line between the tank, the pump and the upper floors, since villas and mid-rise blocks often hide leaks in shared risers and along the roof. Elevation matters less for leaks than the age and pressure of the network, so we test pressure drop and listen for flow in walls and floors before opening anything. We start with the most likely routes because that limits wall damage and lets you decide quickly whether a full repair is needed.

Before the visit, gather your water bills for the last few months, note any damp patches, soft floor areas or unexplained meter movement, and clear access to the tank room, pump and any ground-floor cupboards. Ask the team how they will confirm the leak location, what openings they will need to make, and how the area will be restored afterwards. If you are considering waterproofing the tank, ask about interior tank insulation, which is quoted per square metre in the range of 25 to 65 SAR/m² after inspection.

Before buying or taking over a property, an inspection gives you findings in writing before you sign.

Signs that call for hidden water leak detection

The following signs are worth checking before they grow:

• A damp patch that slowly grows on a wall or ceiling
• A hissing or trickling sound in the wall after the taps are off
• The meter keeps turning with every tap closed

The most common causes

• A common cause: a hot line that expands and contracts with use.
• A common cause: a corroded joint inside a wall.
• A common cause: a cracked pipe under floor tiles.

Tools we use in Al Mrwj

The steps in order

1. Meter test: We stop all use and watch the meter to confirm whether water is actually being lost.
2. Line isolation: We close valves one line at a time to see which line loses pressure.
3. Acoustic listening: We follow the sound of water escaping under pressure and compare its strength between points.
4. Thermal imaging and moisture mapping: We map how far the wet area spreads behind paint and tiles.
5. Documentation: Readings, photos and the likely position go into a written report.

Facts and costs — Al Mrwj

Common questions about hidden water leak detection in Al Mrwj

Mistakes that cost more

• Repainting the stain while the moisture keeps coming back
• Breaking tiles at random before the line is identified

The written outputs

The written output: a technical report with the readings, the likely leak position and a confidence level. The report is numbered and can be checked with its verification code.