How Asbestos Impacts Demolition Projects

If your building was constructed before 2000, there is a real chance asbestos is present somewhere in it. Not maybe. A genuine chance. And if you're planning demolition, this affects your timeline, your costs, and how the whole job is run.

Here's what you need to know.

Why it matters so much

Asbestos isn't dangerous just sitting there undisturbed. The problem is when it gets disturbed. During demolition, materials get broken, cut, and moved. If asbestos fibres become airborne, they can be inhaled. That causes serious and irreversible lung conditions, including mesothelioma and asbestosis. There is no safe level of exposure.

This is why you can't just crack on with demolition and deal with it as you go. The law requires asbestos to be identified and managed before any demolition work starts.

Where it tends to hide

People often think asbestos means roof tiles or insulation boards. But it turns up in a lot of places that aren't obvious.

• Textured coatings on ceilings, often called Artex
• Floor tiles and the adhesive beneath them
• Pipe lagging and boiler insulation
• Soffit boards and external panels
• Roof sheets on older garages and outbuildings
• Partition walls in commercial buildings built in the 60s, 70s, and 80s

A building can look perfectly normal and still contain multiple asbestos-containing materials across different areas. You won't know without a proper survey.

The survey comes first

Before any demolition contractor can legally start work on a pre-2000 building, a refurbishment and demolition survey must be carried out. This is a legal requirement under the Control of Asbestos Regulations 2012.

The survey is intrusive. The surveyor takes samples from multiple locations, including places that would be disturbed during demolition. Those samples go to a lab. Results typically take a few days to come back.

Cost is usually between £200 and £500 for a residential property. Larger commercial buildings cost more depending on size and complexity.

What happens if asbestos is found

This is where projects slow down and costs go up. If asbestos is found and it's in a condition where it poses a risk, it has to be removed by a licensed contractor before demolition proceeds.

There are two categories of asbestos work under UK law. Licensed work covers the most dangerous materials, like sprayed coatings and pipe lagging. This requires a licensed contractor, notification to the HSE at least 14 days before work starts, and strict controlled conditions throughout. Non-licensed work covers lower-risk materials but still requires trained operatives and proper disposal.

The removal process involves sealing off the affected area, using negative pressure enclosures in some cases, and air monitoring throughout. Once removal is complete, a clearance certificate is issued by an independent analyst before anyone else enters the area.

You cannot skip the clearance certificate. And you cannot start structural demolition until it's been issued.

What it does to your timeline

This is the practical impact most people feel.

A straightforward survey and clear result adds around one to two weeks to the start of your project. If asbestos is found and needs removing, add another one to four weeks on top of that depending on the volume and type. If it's a larger commercial building with significant contamination, the programme impact can be much longer.

The 14-day HSE notification period for licensed work alone means you can't rush it even if the contractor is available immediately.

Build this into your programme from the start. Contractors who tell you the asbestos side of things won't cause delays are either guessing or not being straight with you.

What it does to your budget

Asbestos removal is priced separately from demolition. It's specialist work carried out by a different team under different regulations.

For a typical house, asbestos removal can add anywhere from £1,500 to £10,000 or more to the overall cost depending on what's found and where. A garage roof made of asbestos cement sheets might cost £1,500 to remove. Extensive pipe lagging or heavily contaminated floor tiles in a commercial building can push into five figures.

The survey cost is fixed and relatively low. The removal cost isn't something anyone can accurately quote until the survey results come back. Any contractor who gives you a fixed asbestos removal price before seeing a survey report is guessing.

What good contractors do

A competent demolition contractor will tell you upfront that a survey is needed before they can give you a full programme or a firm price. They'll either arrange the survey themselves or point you to an independent surveyor.

At DCL, our operatives are UKATA licensed. We carry out asbestos surveys and removal as part of our overall demolition service so clients aren't left coordinating between separate companies. All waste is disposed of at licensed facilities with the correct documentation.

The bottom line

Asbestos is not a reason to panic. Millions of buildings in the UK contain it. It's managed safely every day.

But it does need to be treated seriously and dealt with in the right order. Survey first, removal if needed, clearance certificate issued, then demolition starts. Trying to cut corners on any of those steps is illegal, dangerous, and will likely cost you more in the long run than doing it properly from the start.

If you're not sure whether your building contains asbestos or what the process looks like, get in touch. We'll talk you through it.