Finished garage conversion in Liverpool transformed into a comfortable living space, showing how an existing garage can become a fully finished room.

Can You Convert A Garage With An Asbestos Roof?

August 22, 2026•8 min read

Spotting a grey, corrugated roof on an older garage is enough to make most homeowners pause before going any further with a conversion. It’s a genuinely fair thing to be cautious about, and it’s worth understanding properly rather than either panicking or ignoring it. Here’s what the law actually says, and what it means for converting your garage.

How To Tell If Your Garage Roof Might Contain Asbestos

Asbestos cement sheeting was a common roofing material before the UK’s ban on asbestos, including the white asbestos most commonly used in cement products, came into force in November 1999. If your garage was built before then, and particularly if the roof is made of grey or off white corrugated sheets rather than modern profiled steel or tiles, it’s worth treating it as a genuine possibility rather than ruling it out. Visual inspection alone can’t confirm this with certainty, and we’re not going to guess at how common it is in any particular area, but it’s a reasonable thing to check for on an older garage.

Yes, You Can Still Convert A Garage With An Asbestos Roof

This is the most important point to understand early on. Finding asbestos cement roofing doesn’t rule out a conversion, it simply means that element of the project needs to be handled correctly, in line with UK asbestos regulations, before the rest of the work goes ahead. It’s a manageable, well understood part of the process for a lot of older garages, not an unusual obstacle.

What The Law Actually Says

Work involving asbestos in the UK is governed by the Control of Asbestos Regulations 2012. Asbestos cement, the type of material typically found in garage roof sheeting, is generally classed by the Health and Safety Executive as non-licensed work, rather than requiring a fully HSE-licensed contractor, which is the requirement for higher risk materials like asbestos insulation board or sprayed asbestos coatings.

However, non-licensed doesn’t mean unregulated. Depending on the condition of the material and the scope of the job, some asbestos cement work is classed as Notifiable Non-Licensed Work, meaning it still has to be reported and carried out with proper controls, training and risk assessment in line with HSE’s published guidance for asbestos cement tasks.

Detached brick garage conversion in Bolton, showing the completed exterior with French doors creating access to the new living space. — This detached garage conversion in Bolton transformed an existing brick garage into valuable additional living space, while retaining an exterior that sits naturally within the garden.

Removal And Disposal Are Governed Separately

This is a detail that catches people out. Removing asbestos cement sheeting carefully, without breaking it up, generally falls under the Control of Asbestos Regulations 2012 as non-licensed or notifiable non-licensed work. Getting rid of it afterwards is a completely separate legal requirement, governed by hazardous waste regulations, and it has to go through a registered waste carrier rather than a standard skip or general waste collection. Both parts need to be handled correctly, not just the removal itself.

Why This Isn’t A Job To Take On Yourself, Even Where It’s Technically Permitted

HSE guidance does allow for careful removal of intact asbestos cement sheeting without a licensed contractor in some circumstances, provided the person doing the work has adequate training, uses the correct wet methods to suppress dust, and follows the proper procedure. In practice, this is a job with real risks attached, asbestos cement roofs are fragile and shouldn’t be walked on, work at height is involved, and getting the handling wrong can release fibres that a careful, trained approach would have avoided entirely.

HSE has taken enforcement action against contractors for exactly this kind of uncontrolled handling and disposal in the past, including cases involving garage roofs, which is a useful reminder that the risk isn’t theoretical. This is exactly the kind of task worth leaving to people who do it properly and regularly, rather than treating as a straightforward DIY weekend job.

How We Handle This As Part Of A Garage Conversion

When we survey an older garage, checking for the possibility of asbestos cement roofing is a standard part of the process, not an afterthought, in the same way we’d flag an existing fuse box or boiler in the garage as something to plan around rather than something that stops a conversion. If asbestos is present, we’ll make sure it’s dealt with by contractors trained and equipped to handle it safely and in line with current regulations, covering both correct removal and compliant disposal, before the rest of your conversion goes ahead. It’s factored into your project properly from the outset rather than becoming a surprise partway through.

Large garage conversion in Bury transformed into a home gym with weights, exercise equipment, feature mirrors and modern interior lighting. — This large garage conversion in Bury gave our customer a dedicated home gym, turning previously unused garage space into a practical room for exercising at home.

What This Means For Your Conversion Timeline

Dealing with asbestos cement roofing generally adds a distinct stage to the start of your project, since it needs to be assessed and, if present, safely removed before the new roof structure and insulation can go in. The exact impact on your timeline depends on the size of the roof and its condition, which is something we’ll be able to give you a clear picture of once we’ve actually seen your garage, and it’s exactly the kind of early stage we build into the garage conversion checklist we work through with every customer. It’s also one of the reasons the figure in our guide on how much you should expect to pay for a garage conversion can vary between older and newer properties, since asbestos assessment and removal, where needed, is factored into the wider cost picture rather than treated as a hidden extra.

Common Misconceptions About Asbestos And Garage Conversions

A lot of homeowners assume that finding asbestos automatically means a fully HSE-licensed contractor is legally required. For garage roof sheeting specifically, that’s often not the case, since asbestos cement is generally classed as non-licensed work, though it still has to be handled by someone properly trained and following the correct procedure.

Another common misconception is that if the roof looks intact and undamaged, there’s nothing to worry about and it can simply be left alone. Undamaged asbestos cement in good condition is genuinely lower risk while it’s undisturbed, but a conversion involves altering or removing the roof structure, which means it needs to be properly assessed and handled as part of the project rather than left in place and worked around.

Large garage conversion in Wigan transformed into a modern snug, with wide bifold doors opening the new living space onto the garden. — A large garage in Wigan converted into a comfortable family snug, with bifold doors bringing more natural light into the finished space and connecting it with the garden.

Questions Homeowners Often Ask Next

A few practical questions tend to come up once people understand the basics.

Can we just leave the asbestos roof in place and build the new structure underneath it? This isn’t usually a suitable approach for a genuine conversion, since the room needs proper insulation and a compliant roof structure to meet Building Regulations, which generally means the existing roof needs to be safely removed rather than built around.

Does having asbestos identified affect our building insurance or Building Control approval? Handling it correctly and keeping proper documentation of safe removal and disposal is the important part. This is something we manage as part of the wider Building Control process on your conversion.

Will finding asbestos significantly delay our start date? It adds a distinct early stage rather than derailing the project, and we’ll give you a realistic picture of the impact once we’ve properly assessed your garage.

Frequently Asked Questions

Can you convert a garage if the roof contains asbestos?

Yes. It needs to be properly assessed and, if present, safely removed in line with UK asbestos regulations before the rest of the conversion proceeds, but it doesn’t rule out converting the garage.

Do you need a licensed contractor to remove an asbestos cement garage roof?

Not always. Asbestos cement is generally classed by the HSE as non-licensed work, though it must still be carried out by someone properly trained and following correct procedure, and some jobs are classed as notifiable non-licensed work depending on condition and scope.

What law covers asbestos removal in the UK?

The Control of Asbestos Regulations 2012 governs work involving asbestos. Disposal is covered separately under hazardous waste regulations, which require use of a registered waste carrier.

How do I know if my garage roof contains asbestos?

Garages built before the UK’s 1999 asbestos ban, particularly those with grey or off white corrugated roof sheets, are worth having properly assessed. Visual inspection alone can’t confirm it with certainty.

Will asbestos in our garage roof delay our conversion?

It typically adds a distinct early stage to the project for safe assessment and removal, rather than stopping the conversion altogether. We’ll give you a clear picture of the impact once we’ve surveyed your garage.

Why Choose Convert Your Garage

We treat older garage roofs with the care they need, assessing for asbestos cement as a standard part of our survey process rather than an afterthought, and making sure it’s handled by contractors properly trained and compliant with current regulations before the rest of your conversion begins. Since 2002 we’ve completed over 4,315 garage conversions across Greater Manchester, many of them older properties, and every project comes with a 10 year warranty.