There are several things to consider when planning a new garage roof, whether it be a pitched or flat garage roof replacement. The biggest considerations are the type of roof you’re planning, the materials to use and the costs involved.
It’s also important to consider which building regulations might apply. If your current garage roof contains asbestos, then it’s recommended you consider a full asbestos garage roof replacement.
These factors apply to both pitched and flat garage roof replacements.
In this guide, we cover:
Things to consider when replacing a garage roof
There are several things to consider when carrying out a garage roof replacement such as:
- The type of material to use
- The style of roof (pitched vs flat)
- Garage roof insulation
- Any potential pre-existing water leakage
Consider each element because they will impact the final cost of the new garage roof and the time it takes to install.
The type of material you use will be the biggest factor that influences cost. Roofing felt is the most affordable, costing around £40 per square metre (m²) on average, as well as being comparatively easy to repair.
However, the drawback is that roofing felt tends to wear out quite easily so you may need to repair your roof more regularly compared to other roofing materials.
Alternatives such as EPDM rubber and GRP Fibreglass give much better protection against bad weather, although they cost more per m².
GRP fibreglass is extremely durable and can last for around 30 years before needing to be replaced. It’s flexible and can be adapted to suit almost any roofing situation. However, GRP fibreglass isn’t suitable for large roofing projects because of large expansion and contraction rates.
Below are the average m² prices of the most popular roofing materials in the UK to help you plan your garage roof replacement. When you choose a professional roofer, discuss what the best roofing material to use is for your garage.
Cost to install garage materials per m²
|Type of roofing||Cost per m²||Cost per 20m²|
Potential water leakage
One of the major problems that a damaged roof can lead to is water leakage. Water leakage is most commonly an issue for flat roofs because standing water can gather on the roof’s surface.
Water can often cause the wooden structure of a garage roof to rot, which will lead to an extra cost being added to your pitched or flat garage roof replacement. Another potential issue is damaged flashings that protect the vulnerable parts of the roof like the chimney. This may add an extra £250 to your new garage roof.
If there’s substantial water leakage occurring, it’s important to temporarily seal it while planning your garage roof repair or replacement. This will prevent any further damage from occurring.
Consider the different types of garage roofs available before you agree to the garage roof replacement. Each type of roof has pros and cons, and it will depend on your circumstances which one is right for you.