Basement & foundation waterproofing for villas in Alquwayiyah

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

Before we start: what we know about Alquwayiyah

The centre of Alquwayiyah sits about 811 m above sea level (SRTM open elevation data).

Alquwayiyah sits at about 811 m above sea level, which is a useful starting point for any basement or foundation job here. At that elevation the ground and the building envelope face a different set of conditions from coastal sites, so before any quote is given the technician checks how water is likely to reach the lower walls and slab. The first checks focus on the basement walls and floor, since that is where the largest area of exposure sits. Cracks in the foundation are noted early, because crack injection is priced per metre and its extent shapes the whole scope. For reference, the market range for basement waterproofing is SAR 50–150 per m², crack injection is SAR 40–120 per metre, and epoxy coating is SAR 35–90 per m², so the choice of system depends heavily on what the inspection finds.

Several points are left to the site visit itself. The technician must measure the real wall and floor areas, confirm where the ground water tends to collect, and judge whether the existing surfaces are sound enough to take a membrane, spray foam or coating. Bathroom and tank areas inside the villa are assessed at the same time, since bathroom waterproofing runs SAR 15–40 per m², and tank internal coating runs SAR 25–60 per m², and these are often bundled with the basement job. The roof is also walked on the visit, where liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m² may be considered. Insulation such as XPS boards, priced at SAR 12–30 per m², is discussed only where it suits the wall build-up. None of these decisions should be made from a desk estimate alone.

To help the technician arrive prepared, the homeowner should have ready the villa layout, any previous waterproofing records, and a note of where leaks have appeared and after which rainfall. Information about when the basement was last dry, whether a tank sits in the lower level, and the age and type of the existing finishes all save time on site. Access to the basement walls on all sides, and clear space around the slab, allows a fuller inspection. Providing this detail in advance lets the technician match the right system to each area and keeps the measured scope closer to the final work.

Villas often have several lines and tanks; we test them one at a time so the cause is clear.

Signs worth paying attention to

These are the signs most often linked to basement & foundation waterproofing:

• Salt marks at the bottom of the walls
• Damp basement walls
• Water seeping in after rain

The most common causes

• A high groundwater level.
• Rainwater draining towards the foundation.
• Cracks at construction joints — we check this before anything else.

How we choose the tool in Alquwayiyah

From the first visit to the report

1. Finding the source: Groundwater, rain or a pipe — each needs a different treatment.
2. Preparation: Surfaces are cleaned and opened where needed.
3. Injection: Active cracks are injected.
4. Waterproofing layers: The system is applied on the right side of the wall where possible.
5. Follow-up: Readings are repeated after the treatment.

Facts and costs — Alquwayiyah

Questions from Alquwayiyah

Common mistakes we see

• Painting the basement wall while the water comes from outside

The written outputs

You receive: the source, the treatment and the follow-up result, in a technical report with a verification code.