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How much does it cost to replace a flat roof?

Updated: Oct 29


A flat roof that has just been fitted

If you're considering installing a flat roof or replacing an existing flat roof, it's important to have a clear understanding of the associated costs.


The cost of a flat roof can vary significantly depending on several factors, such as the type of roofing material, roof size, complexity of the design, and geographic location.


In this article, we will explore the factors that influence the cost of a flat roof and provide a general overview of the expenses involved.

Roofing Material


Rolls of bitumen waiting to be fitted on a flat roof

The choice of roofing material has a significant impact on the cost of a flat roof.


Common flat roofing materials include built-up roofing (BUR), modified bitumen (MB), ethylene propylene diene monomer (EPDM), polyvinyl chloride (PVC), and thermoplastic olefin (TPO).


Each material has its own pros, cons, and associated costs. Discussing options with a roofing contractor will help determine the most suitable material for your specific needs and budget.

Roof Size and Complexity


A semi-circle shaped flat roof installation

The size of the roof is a major factor in determining a flat roof cost.


The larger the roof area, the more materials and labour will be required, resulting in higher expenses.


Additionally, the complexity of the roof design can influence costs. Roofs with multiple levels, unique architectural features, or intricate detailing may require additional labour and specialized techniques, impacting the overall cost.

Removal and Disposal

If you are replacing an existing flat roof, the cost will include the removal and disposal of the old roofing material.


The complexity and time required for this process will contribute to the overall cost.


Factors such as the number of layers to remove and the accessibility of the roof can affect the expense.

Roofing System Accessories

Flat roof installations often require additional accessories such as insulation, flashings, drainage systems, and rooftop equipment supports.


The choice and quality of these accessories can influence the overall cost.


Proper insulation, for example, can enhance energy efficiency but may increase the upfront expenses.

Labour Costs

The labour costs associated with installing or replacing a flat roof can vary depending on the complexity of the project, local labour rates, and the experience and expertise of the roofing contractor.


It's advisable to obtain multiple quotes from reputable contractors to ensure a fair and competitive price.

Geographic Location


A worker fits a flat roof using a fire torch.

The location of your property can also impact the cost of a flat roof.


Factors such as local building codes, permit fees, and regional supply and demand dynamics can influence pricing.


It's important to consider the specific requirements and regulations of your area when estimating costs.

While it is challenging to provide an exact figure for the cost of a flat roof due to the variables involved, the average price range can vary from £60 - £250+ per square metre.


This range provides a general idea of what to expect, but it's crucial to obtain detailed quotes from roofing contractors based on your specific project requirements.

It is important to note that investing in a high-quality installation by experienced professionals is crucial for the long-term performance and durability of your flat roof.


Opting for cheaper alternatives or compromising on quality can result in higher maintenance costs and premature roof failure.

In conclusion, the cost of a flat roof depends on several factors, including the roofing material, roof size, complexity of the design, removal and disposal requirements, accessories, labour costs, and geographic location.


Consulting with professional roofing contractors and obtaining multiple quotes will help you determine the most accurate estimate for your flat roofing project.


Prioritizing quality and durability will ensure that your flat roof provides long-lasting protection for your property.

Can I replace my own flat roof?

Are you contemplating the task of felting your flat roof?


There are lots of products available to install flat roofing yourself and with the right guidance you can successfully waterproof and protect your roof from the elements.


Having said that there are lots of potential issues with going down this route, including poor installation, wrong product choice and compliance with current building control and Part L regulations (Insulation Requirements) regarding replacement of flat roofs.


Another issue would be a lack of warranty or guarantee on the product and installation.


Need help with your project? Get in touch with S&L Flat Roofing

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