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How much does Flat Roofing Installation cost?

Average Price
$2,500 - $6,000

What is the price of Flat Roofing Installation?

Thinking of hiring a roofer to install a flat roof on your property? Read our handy guide to find out how much you can expect to pay for flat roofing installation in Australia.

What is Flat Roofing Installation?

Whether you’re looking for a replacement roof for your home or garage or a new roof for your extension, a flat roof is often an appealing option.

Flat roofs are generally the cheapest type of roof, making them a popular choice. By hiring a professional roofer, you can rest assured that your flat roof is properly installed, reducing the chance of problems occurring.

Contrary to popular belief, a flat roof shouldn’t be completely flat. Flat roofs should be slightly angled to allow rainwater to escape into gutters or outlets and to avoid pooling. This will give your flat roof the best possible chance of achieving a long life.

How much does Flat Roofing Installation cost?

A professional roofer will ensure that your flat roof is installed to the highest standard, helping to reduce the chance of needing repairs later down the line. But how much can you expect to pay for flat roofing installation in Australia?

The price you’ll pay for flat roofing installation will depend on the size of the area that needs roofing and your location. Although there is no fixed rate for installing a flat roof, a breakdown of average costs for flat roofing installation is given below.

Average cost of Flat Roofing Installation
Average cost$4,000
Minimum cost$2,500
Maximum cost$6,000

What changes the price of Flat Roofing Installation?  

The cost of flat roofing installation is dependent on several different factors including:

  • Roof size

  • Specification

  • Location

Roof size

The cost of your flat roof installation will be dependent on the size of the roof you require. For example, a flat roof for a single garage could cost $2,500 whilst a flat roof for a three-bedroom house might cost $6,000. In general, the bigger the roof you require, the higher the price of flat roofing installation will be.


The specification of your flat roof will impact its cost. For example, you’ll have the option to specify the thickness and type of both the roofing membrane and the insulation. Certain options will come with a higher price tag, based on their cost and quality, whilst others will be cheaper.


Your location will also influence the cost of flat roofing installation. The price of hiring a roofer varies across Australia, with prices typically higher in cities such as Sydney, Brisbane and Melbourne. You may also find that prices in more rural areas may be lower than the average. However, the prices should still fall within the average price range.

How to reduce the cost of Flat Roofing Installation

There are a few things that you can do to reduce the price of flat roofing installation.

  • If you’re replacing an existing flat roof, the simplest way to minimise your costs is to recover the existing flat roof. This will speed up installation whilst reducing labour costs and minimising disruption.

  • When you hire a roofer to install your flat roof, you’ll be given options for the type and thickness of roofing membrane that you require. Generally speaking, the thicker the membrane, the longer it will last. This membrane often comes with a warranty. You can reduce the price of your flat roofing installation by choosing to go without the warranty, or opt for a shorter warranty.

  • It’s also important to consider how much insulation you need. You can improve the insulation by opting for two thinner layers of roof insulation instead of one thicker layer. This will improve the R-value performance along with reducing air leakage. This will help you to keep the costs down as you can get the same performance with less insulation.

You need a flat roof installing, but where should you start with hiring a roofer? We’re here to help. When you search for a roofer on Bark, you can browse the profiles of companies that meet your requirements and read reviews from genuine clients before requesting a quote. 

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