Garage Roofing That Can Handle the UK Weather

Whether you’re replacing old garage roofing or building a new garage from scratch, the waterproofing will be one of the most important decisions you’ll make. In the UK, where the weather can go from mild to miserable in the blink of an eye, homeowners are increasingly turning to the us with questions like:

• What’s the best material for garage roofing?
• How much does it cost to replace a garage roof?
• Do I need planning permission?

We’re here to answer these and other questions and concerns around garage roofing in the UK—and to offer a few tips on what you should consider when planning your next project. Let’s take it one step at a time…

Garage Roof Replacement: When and Why?

Over time, garage roofs deteriorate. Whether it’s cracked felt, rusted panels, or storm damage, a replacement might be more cost-effective than endless or repeated repairs.

Signs it’s time to replace your garage roof:

• Leaks or water stains inside
• Sagging or bowing
• Rusted or broken panels
• Persistent mould or condensation

Common issues with flat roofing – repair or replace?

Flat roofs are popular for garages, but they do come with their quirks. These mainly concern drainage. Problems like pooling water, cracks and poor insulation are common issues with outdated flat garage roofing, for instance. Whether you choose to carry out a quick emergency repair or need a long-term repair – if it isn’t the first time, consider replacing worn waterproofing once it starts causing problems.

Many homeowners are choosing to replace felt roofs with modern solutions like EPDM rubber, liquid coatings or plasticised options, such as Rhenofol, which offer better longevity, fewer repairs and less maintenance. Which you select might depend on the type of flat roof substrate you’re working with, you have a few options:

Timber substrates: EPDM membrane is perfect for a timber flat roof and garage roof kits are available in standard sizes for these types of projects

Concrete roofing: a liquid PU coating will cover almost any substrate and can also be applied by a skilled DIYer.

Metal and other roof substrates: liquid PU, as above, and also Rhenofol CV, a PVC-P product installed professionally are both excellent, high performance waterproofing systems for garage roofing.

Garage Roof Insulation: A Growing Trend

As people convert garages into gyms, workshops, or even home offices, roof insulation is becoming a priority.
Popular questions include:

•  Is PIR insulation too good for garage roofing?
• Can I insulate garage roof myself?
• What is the best insulation for garages?

The answer? Insulating your garage roof not only makes it more comfortable—it can help reduce condensation and improve energy efficiency, too. PIR insulation boards are the ideal approach for DIY, fast and straightforward to install with systems such as EPDM and liquid PU, which can be installed straight over the top. They can also provide an even surface for application, already cleaned and prepped for the job.

Do I Need Planning Permission for a Garage Roof?

One of the biggest concerns at the start of the project is often about planning permission, especially for homeowners in conservation areas, those with listed properties or those with bigger plans for converting the garage into living space.

The good news? In most cases, replacing or upgrading existing garage roofing does not require planning permission if the overall height and footprint don’t change. However, you’ll almost certainly need permission if you’re building a garage from scratch and always check with your local authority if:

• You’re raising the roof height
• Installing skylights
• Adding a pitched roof
• Changing the colour of the waterproofing
• Converting the garage into a habitable room

How Much Does It Cost to Replace a Garage Roof in the UK?

This is one of the most commonly asked questions—and it depends on the size, material, and complexity, and whether you’re installing it yourself or engaging a professional.

Typical costs:

• Basic felt roof: from £400+
• GRP/Fibreglass roof: £800–£1,500
• EPDM Rubber: complete DIY EPDM garage roofing kits from £595
• Metal/Steel roofing: £1,200–£2,500+
• Liquid Coatings: complete DIY roof kits from £255 (5m2) to £531 (10m2)

A Word About Future Proofing

Garage roofing in the UK is no longer just about patching up old felt. Homeowners are looking for smart, durable, and energy-efficient solutions that add value to their property and can stand the test of time and the UK weather.

Have questions or want to explore your options? Get in touch today and speak to our team about modernising your garage roofing.

PermaGroup has established links with some of the biggest names in our industry thanks to our reputation of excellence. Read more about becoming a supplier or stockist here.