Basement & foundation waterproofing in Arar: cost & published offers

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

Why basement & foundation waterproofing differs in Arar

The centre of Arar sits about 553 m above sea level (SRTM open elevation data).

Arar sits at roughly 553 m above sea level, which places it on the northern plateau of the Kingdom. The elevation matters for basements and foundations because the ground here is shaped by dry, open terrain where rainfall arrives in short, intense bursts rather than steady wet seasons. Water runs off quickly and collects in low spots around footings, so a basement that stays dry for months can still take on water during one heavy storm. Our assessments therefore start with the grading around the building and the drainage path, not only the wall surface.

Each of the published rates links to a practical choice. Basement waterproofing is quoted at SAR 50–150 per m², and the wide range reflects how much excavation and surface preparation the wall needs before any membrane goes on. Crack injection, priced at SAR 40–120 per metre, is often the right first step when a leak follows a single line, since it treats the defect without covering the whole wall. Where a wall is damp rather than actively leaking, epoxy coating at SAR 35–90 per m² or spray foam at SAR 20–45 per m² can seal the surface. Bitumen membrane at SAR 15–35 per m² suits areas that need a flexible barrier, and XPS boards at SAR 12–30 per m² add insulation alongside protection. For roofs, liquid roof waterproofing at SAR 8–25 per m² is the most economical option, while tank internal coating at SAR 25–60 per m² protects stored water and the structure around it.

Owners who avoid the most expensive problems usually steer clear of a few habits. They do not seal a cracked wall without first identifying where the water enters, because a coating laid over a live leak simply traps moisture behind it. They do not compare quotes by the lowest per-metre figure alone, since preparation, edge detailing and drainage work often make up the real difference. They also avoid skipping the ground outside the building, as a membrane inside cannot fix water that is being pushed against the foundation from outside. Finally, they keep the rates in this section in view as a reference, and ask every contractor to state the scope behind each number in writing.

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

The following signs are worth checking before they grow:

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

Causes we see in the field

• A common cause: cracks at construction joints.
• A common cause: a high groundwater level.
• A common cause: rainwater draining towards the foundation.

How we choose the tool in Arar

How the work is done, step by step

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 Arar

Short answers for Arar

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.