- A French drain is a gravel-filled trench with a perforated pipe that collects ground water and carries it away.
- It helps where water collects against foundations, basements or retaining walls.
- It is not a fix for every damp problem. It does nothing for rising damp from a failed DPC, leaks or condensation.
- Describe the site once and compare quotes from contractors across Cape Town.
Tell us about the problem and compare quotes from french drain installation specialists in Cape Town.
Compare QuotesWhen a French Drain Can Help
- Water pools against the house after rain.
- Soil stays waterlogged next to walls in winter.
- Water builds up behind retaining walls.
- Basements or lower-ground rooms get wet from surrounding ground.
Site Assessment
- Where the water comes from: surface run-off, a slope, or the water table.
- Soil type and how fast it drains.
- Where the water can legally and practically go: stormwater, a soakaway or the street.
- Falls along the route.
- Services in the way: pipes, cables and foundations.
In Cape Town, stormwater may not be discharged into the sewer. Confirm where the outlet will go before work starts.
Options and Their Limits
| Option | When it is used | Limitations |
|---|---|---|
| Exterior French drain | Ground water against walls and foundations | Needs a fall and a legal outlet |
| Drain behind a retaining wall | Water pressure behind the wall | Best built with the wall; retrofitting means digging |
| Interior perimeter drain | Basements where outside access is impossible | Needs a sump and pump |
| Surface channel drains | Run-off from paving | Does not deal with ground water |
What the Work May Include
- Marking services and excavating the trench.
- Laying geotextile, gravel and a perforated pipe at a fall.
- Connecting to an outlet, soakaway or sump.
- Backfilling and reinstating paving or gardens.
- Adding rodding points for cleaning.
French Drain Installation Prices in Cape Town
| Item | Ballpark price |
|---|---|
| Basic exterior French drain, per linear metre | R300 - R600 |
| Interior basement drain, per linear metre | R600 - R900 |
| Deeper or more complex systems, per linear metre | R900 - R1,500+ |
Ballpark figures, not quotations. Indicative 2026 ranges, rounded, from published South African damp-proofing, waterproofing and plastering price guides (Cape Town and Western Cape guides where available, national and Gauteng guides otherwise), checked October 2026. Per-metre prices are per linear metre of wall unless stated. Some include VAT and some do not, so confirm VAT on every quote. A site assessment and a written quote set the actual price.
What changes the price
- Trench length and depth.
- Hand digging or machine access.
- Outlet, sump or pump needs.
- Paving and garden reinstatement.
Maintenance
Keep outlets clear, check rodding points after heavy rain and stop roots and silt clogging the pipe. A blocked drain stops working without obvious signs.
Getting French Drain Quotes
Give the rough length, where water collects and add photos. Compare quotes through Damp Proofing Cape Town.
Frequently Asked Questions
Will a French drain stop rising damp?
No. Rising damp needs a working DPC. A French drain manages ground water.
How deep should a French drain be?
It depends on the problem. Drains protecting a basement or retaining wall go deeper than those handling surface water.
Where does the water go?
To a stormwater point, soakaway or another legal outlet. Not into the sewer.
Do French drains need maintenance?
Yes. Outlets and pipes should be checked and cleared.
Related Pages
Damp Proofing Cape Town is a free quote-comparison service. Damp is inspected, quoted and repaired by independent damp proofing contractors, and your agreement is with the contractor you appoint. Ask each one for a written, itemised quote, what is and is not included, guarantee terms and payment terms before paying anything.
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