Waterproofing cost guide, Cape Town 2026
What waterproofing a Cape Town roof really costs.
Roofs, walls, damp and asbestos sheeting, priced honestly. One system, Rubber Sealant Liquid Rubber, applied the way it was designed to be applied.
Liquid rubber waterproofing, flat roof
from R265 per m²
Recoat over an existing failed coating
from R230 per m²
Tiled or metal roof coating
from R240 per m²
These are guidance ranges to help you budget, not a quotation. Every property is different. We give you one fixed price for the whole job after we have looked at it properly and written down what we found.
Waterproofing is the easiest trade in the country to underprice, because the difference between a good job and a bad one is completely invisible for about eighteen months. Then it rains properly.
Below is what the published guides show for South Africa in 2026, and where we sit: the top of the range, not past it. We are an approved applicator and reseller for Rubber Sealant Liquid Rubber, and that seamless liquid rubber system is the only waterproofing we install. No torch-on, no injection damp courses, no subcontracted mystery product.
The market, and us
What it costs, and what you get for the difference.
Liquid rubber waterproofing, flat roof
Cape Town market
around R250 per m²
Williams & Co
from R265 per m²
Full clean and prime, all details and upstands reinforced with membrane, then three coats built to the specified thickness rather than two thin ones.
Recoat over an existing failed coating
Cape Town market
R180 to R280 per m²
Williams & Co
from R230 per m²
Failed coating cut out, sound coating scarified and primed. Cheaper than a full strip because we are honest about what can stay.
Tiled or metal roof coating
Cape Town market
R120 to R260 per m²
Williams & Co
from R240 per m²
Wash, rust treatment or ridge repointing first, correct primer for the substrate, then a full coating system. Galvanised and rusted metal need different primers and get them.
Asbestos sheeting encapsulation
Cape Town market
R200 to R320 per m²
Williams & Co
from R285 per m²
Sheets sealed in place with liquid rubber instead of broken up and carted away. No fibre disturbance, no removal permit, no roof replacement bill.
Rising and lateral damp on walls
Cape Town market
R400 to R900 per linear metre
Williams & Co
from R780 per linear metre
Diagnosed before it is priced. Plaster removed back to sound, treated, and rebuilt with a liquid rubber damp proof system. Painting over damp is not damp proofing.
Balconies, parapets, showers and details
Cape Town market
quoted per detail
Williams & Co
quoted per detail
This is where nearly every leak actually starts and it never prices sensibly per m². It gets its own line so it cannot be quietly skipped.
These are guidance ranges to help you budget, not a quotation. Every property is different. We give you one fixed price for the whole job after we have looked at it properly and written down what we found.
Where we stand
We are not the cheapest. That is the whole point.
Our rates sit at the top end of what Cape Town charges, not past it. We are not the cheapest, and we are not trying to be the most expensive either. What you are paying for at the top of the range is the part that never shows in a photograph: the wash, the crack repair, the primer, and the last coat that a cheap quote quietly leaves out.
Why the cheap quote is cheap
The savings all come out of the same place.
Nobody diagnosed the leak
Water travels. The stain on your ceiling is almost never under the failure. Coating the area around the stain is the single most common waste of money in this trade, and it is what a same-day quote gets you.
Two coats instead of three
Liquid systems only work at their specified dry film thickness. Two coats saves a third of the material and a third of the labour, and it fails first at exactly the points that carry the most water.
The details get coated, not reinforced
Upstands, corners, outlets and pipe penetrations need membrane reinforcement. Brushing liquid over them looks identical on the day and cracks at the first movement.
The roof was never cleaned
Liquid rubber sticks beautifully to dust, right up until the dust lets go of the roof.
Worked example
A real job, priced line by line.
Flat concrete roof over a Durbanville living area, 65 m², leaking at two points, previously coated years ago
Inspection and written diagnosis
Roof walked and photographed, water path traced and written down before pricing
included
Strip and clean
Failed old coating removed, full high-pressure clean, surface dried
R4,300
Substrate and crack repair
Cracks opened and sealed, ponding low spots corrected, outlet cleared
R3,600
Primer
Full coat of the correct primer for concrete
R2,500
Detail reinforcement
All upstands, corners, outlets and penetrations reinforced with membrane
R4,100
Three coats Rubber Sealant Liquid Rubber
Applied to specified thickness across the full roof area
R11,700
One fixed price
R26,200
About R403 per m² for a roof that had to be stripped back first. A straightforward sound roof with no strip-out sits close to the R265 per m² starting rate. The R9,000 quote you will also get is two thin coats over an unwashed roof, and you will be phoning someone about it next winter.
What is not in the price
So the number stays honest.
- Structural repairs to the roof deck, quoted separately once exposed
- Replacing rotten timber, sheeting or broken tiles
- Electrical or solar disconnection and reinstatement where panels have to move
- Interior ceiling and cornice repairs after a leak, quoted on their own
FAQ
Frequently asked questions
Get your own number
Guidance only goes so far. Let us look at the property.
We come out, get onto the roof and the walls, photograph what we find, and send you one fixed price for the whole job.