Garage Roof Replacement Cost Calculator

Garage roofs are often forgotten about. After all, they’re not always part of your ‘main’ property, and they’re rarely a priority. It’s not until problems start to show that homeowners start to take note

Whether it’s regular leaks or visible wear from age, replacing a damaged garage roof is a key part of protecting anything stored inside.

There’s a wide range of roofing materials to choose from, but fibreglass is an especially popular choice. It strikes the perfect balance between durability and cost, providing a strong, long-lasting solution.

To help you estimate the cost of your garage roof replacement, it’s a good idea to use a fibreglass roof cost calculator. By inputting some key pieces of information, such as roof size and your location, you’ll get a rough idea of fibreglass roofing costs for your specific project.

We can also help you find roofers in your area!

Garage Roof Replacement Cost Calculator

Average Garage Roof Replacement Costs

The average cost of replacing a garage roof is between £70 and £100 per square metre, depending on the size and material used, or a total of £750 for the entire roof. For a single garage flat roof, you should expect to pay around £450 for materials and £350 for labour. For a double garage, this cost unsurprisingly increases to around £700 for materials.

Cost Breakdown

The average cost of replacing a garage roof is £75 per square metre for felt, £125 per square metre for fibreglass and between £70 and £100 per square metre for EPDM. For the entire cost of the replacement, you should budget between £700 and £1,000 for a single flat roof, and between £900 and £1,400 for a double flat roof. It’s a lot more expensive to replace a pitched garage roof, at between £2,500 and £4,500.

You’ll also need to factor in the cost of labour, which increases depending on the complexity of the project, and roofers generally charge between £280 and £360 per day. Additional services are also extra. You can expect to pay between £500 and £1,500 for insulation upgrades, and between £100 and £250 for waste removal.

Factors That Influence the Cost

There are several factors that influence the cost of a garage roof replacement, and knowing what they are will help you to budget for fibreglass roof costs before your project begins.

Garage Size and Roof Shape

As you might expect, larger garages cost more. This is because more materials and labour are needed to complete the job. The shape of the roof is also factored into things, as flat roofs are generally simpler and cheaper to replace than pitched roofs.

Type of Roofing Material Chosen

Material choice has a big impact on the cost of replacing a garage roof. Felt tends to be an affordable, budget-friendly option, but it’s not as long-lasting or durable as other options. EPDM and GRP fibreglass have a higher upfront cost, but they last a lot longer, making them a better long-term investment. The material you choose affects the replacement price and the cost of maintenance going forward.

Ease of Access and Height

If the garage is detached and easily accessible, labour costs will likely be lower, as the job will be relatively straightforward. However, if scaffolding is needed or if the garage is difficult to access, you should expect the price to increase to account for the additional labour and complexities.

Location in the UK

Fibreglass roofing cost differs depending on where you’re based in the UK. You’re likely to find the cost higher in London, the South East and busy cities, as this is where labour costs are highest. This is why a fibreglass roof cost calculator takes your location into account when providing a quote.

Urgency and Weather Conditions

Sometimes, you can plan to have a garage roof replaced ahead of time, but that’s not always the case. If you need the job completed urgently - for example, due to storm damage or a serious leak that can’t be ignored - you should expect to pay a premium for a quick turnaround. Poor weather conditions also need to be factored in, as rain, ice and storms can extend the timeline, which could increase the overall cost.

How to Use the Garage Roof Cost Calculator

Using a fibreglass roof cost calculator is quick and easy. All you need to do is select your roof type - for example, flat or pitched - enter the rough size of your garage, and choose your preferred roofing material.

Once you’ve added in your location, the fibreglass roof cost calculator will give you a fibreglass roofing cost estimate based on market averages.

Find Tradespeople, compare up to 3 quotes!

It's FREE and there are no obligations

Get started

Choosing the Right Roofing Material

There’s a lot to think about when you’re planning a garage roof replacement, including choosing the right material. To ensure that you’re striking the perfect balance between cost, durability and visual appeal, you need to weigh up all of your options.

Felt Roofing

Felt is one of the most affordable material options, and it’s often used on flat garage roofs. It’s quick to install and provides a waterproof finish, though it doesn’t tend to last as long as other materials.

EPDM

EPDM is a flexible and durable rubber that’s commonly used on flat garage roofs. It can last for decades, it’s water-resistant and can withstand extreme weather.

Fibreglass

Fibreglass offers a sleek finish, minimal maintenance and boasts a long lifespan. Though the fibreglass roof cost isn’t the cheapest, it does offer long-term value and longevity.

Clay or Concrete Tiles

Tiles are commonly used on pitched roofs. They create a more traditional look, lasting for many, many years with the right maintenance. However, they are heavier and more expensive than other roof material options, which means they’re only suitable for garages with a strong structure.

Tips to Save Money

Replace the Roof During Dry Months

As long as the replacement isn’t urgent, consider scheduling your project during the spring or summer. This will help you avoid weather delays and additional costs related to wet or cold conditions. Roof replacements tend to be completed quicker in drier weather, which can reduce labour time and cost.

Get Multiple Quotes

It’s important to compare quotes from multiple contractors, as this will help you find the best price. You don’t want to pay too little and risk being left with a subpar finish, but you also don’t want to pay more than you need to.

Combine with Other Home Improvement Jobs

If you're planning other exterior upgrades - for example, if you’re having your guttering cleared or fascia boards replaced - consider combining the jobs with your roof replacement project. You might find that some contractors offer discounts for combined work, and you’ll benefit from not having to handle the admin of hiring multiple people.

FAQs

Ready To Get a Quote?

A durable, maintained, and expertly installed garage roof is key for protecting your belongings, maintaining the structure of your property, and avoiding long-term repair costs. But replacing a garage roof is an investment, and it’s a good idea to have a rough idea of how far your budget will stretch.

Our fibreglass roof cost calculator makes it easy to estimate the cost based on your specific roof size, material choice and location. Once you’ve used the calculator, you can approach roofing contractors with a rough idea of what to expect.