# Balcony Waterproofing Cost Calculator & Price Guide

This is the text version of https://www.supertrades.com.au/calculators/balcony-waterproofing-cost-calculator.

Balcony waterproofing cost in Australia usually depends on the membrane system you choose, the size of the area and whether the slab is in good condition. As a guide, balcony waterproofing price typically starts from about $180/m² for a liquid applied membrane and can reach around $220/m² for a sheet membrane system, with all figures in AUD.

## Balcony Waterproofing price breakdown

Typical job based on 18 m². Prices are supply-and-install midpoints. Actual quotes vary.

| Type | Cost per m² | Typical 18 m² job |
| --- | --- | --- |
| Liquid applied membrane | $180 | $3,240 |
| Sheet membrane system | $220 | $3,960 |
| Torch-on / bitumen membrane | $200 | $3,600 |

## What affects Balcony Waterproofing cost

- **Membrane system:** The biggest driver of balcony membrane cost is the waterproofing system selected. Supply and install mid-rates are $180/m² for liquid applied membrane, $200/m² for torch-on / bitumen membrane and $220/m² for a sheet membrane system.
- **Balcony size:** The calculator is area-based, so the cost to waterproof a balcony rises in line with the number of square metres. The estimate is worked out using the chosen per-m2 rate multiplied by the balcony area, subject to the $2800 minimum job charge.
- **Slab condition:** If the slab needs repair rather than being in good condition, add $45/m² to the selected membrane rate before multiplying by area. This can materially increase balcony waterproofing cost per m2 across the whole job.
- **Estimate range and minimum charge:** Displayed estimates use a range of ±18% around the midpoint, so the final shown price is not a single fixed number. For smaller balconies, the minimum job charge of $2800 AUD applies when the calculated total falls below that amount.

## Frequently asked questions

### What is the typical balcony waterproofing cost in Australia?

Using the standard 18 m² example, a liquid applied membrane is priced at a midpoint of $3240, torch-on / bitumen membrane at $3600 and a sheet membrane system at $3960. The displayed estimate range is ±18% around those midpoints, so the shown pricing will vary around each figure. All amounts are in AUD.

### What is the balcony waterproofing cost per m2?

The balcony waterproofing cost per m2 is $180/m² for liquid applied membrane, $200/m² for torch-on / bitumen membrane and $220/m² for a sheet membrane system. If the slab needs repair, add $45/m² before multiplying by the total area.

### How much is the balcony waterproofing price for an 18 m² balcony?

For a typical 18 m² balcony in good condition, the midpoint price is $3240 for liquid applied membrane, $3600 for torch-on / bitumen membrane and $3960 for sheet membrane. The estimate range shown by the calculator is based on ±18% around each midpoint, so the displayed total will be slightly lower and higher than those figures.

### How does slab condition change the cost to waterproof a balcony?

If the slab needs repair, add $45/m² to the base membrane rate before calculating the total. On an 18 m² balcony, that adds $810 to the midpoint price, making the totals $4050 for liquid applied membrane, $4410 for torch-on / bitumen membrane and $4770 for sheet membrane.

### What affects balcony membrane cost the most?

The membrane type and the slab condition have the largest impact on balcony membrane cost. Rates range from $180/m² to $220/m² in good condition, and required slab repairs increase that rate by a further $45/m² before area is applied.

### Is there a minimum balcony waterproofing price?

Yes. A minimum job charge of $2800 AUD applies when the calculated total falls below that amount. This means smaller balconies may still start at $2800 even if the straight per-square-metre maths would otherwise be lower.

Quotes: [Balcony Waterproofing](https://www.supertrades.com.au/balcony-waterproofing/index.md).