Basement & foundation waterproofing in Unaizah: cost & published offers

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

Basement & foundation waterproofing in Unaizah: the local context

Team note on Unaizah: Kashf teams serve this city and its nearby districts with the same documented inspection standard: device-based leak detection without demolition, a written report, and a clear scope before any work begins.. The centre of Unaizah sits about 667 m above sea level (SRTM open elevation data).

Picture a homeowner in Unaizah whose villa has a basement used for storage and a family room. After a heavy rain, they notice damp patches on the lower walls and a faint musty smell near the floor. They want to know what waterproofing should cost before they call anyone, and they want to avoid paying for work that does not fit the problem. Like many owners of older properties, they are unsure whether the leak comes from the walls, the floor slab or a crack that has widened over time.

Unaizah sits at roughly 667 m above sea level, and that elevation matters for planning. Because the town is on a raised plateau, its ground and drainage behave differently from low-lying coastal sites, so a basement here should be checked for how water moves across the surrounding land during storms. The published rate for basement waterproofing runs from SAR 50 to SAR 145 per m², a wide range that reflects how much preparation the walls need. Crack injection is priced separately at SAR 40 to SAR 115 per metre, so a owner with a few isolated cracks may find that treatment far cheaper than full-surface coating.

Start by measuring the area that is affected and noting where the water appears, since this decides which products are relevant. Next, have the cracks marked and assessed, because injection is priced per metre and may solve a localised leak without covering the whole wall. Then compare the main options by their published ranges: epoxy coating at SAR 35 to SAR 85 per m², spray foam at SAR 20 to SAR 45 per m², and bitumen membrane at SAR 15 to SAR 35 per m². Finally, ask each provider to itemise surface preparation, materials and any repair work so that every quotation can be compared on the same basis.

Prices shown on this page come from our own published price list for the city; the final price is set after inspection.

Signs worth paying attention to

If you notice one of these signs in Unaizah, it is a good moment to talk to the team:

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

Causes we see in the field

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

Tools and methods, and when we use them

The steps in order

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.

Quick comparison: facts and costs in Unaizah

Common questions about basement & foundation waterproofing in Unaizah

What we advise against

• Painting the basement wall while the water comes from outside

The written outputs

The written output: the source, the treatment and the follow-up result. The report is numbered and can be checked with its verification code.