The Effects of Construction Waste on the Environment: Best Recycling Methods

Construction, demolition and excavation activity generates around 61% of all waste produced in the UK, making it the country’s largest waste stream by volume (Defra/GOV.UK). In 2022, England alone generated 63.0 million tonnes of non-hazardous construction and demolition waste, with a recovery rate of 94.3%. Even so, several million tonnes still aren’t recovered each year, and poorly managed waste can damage soil, water and local ecosystems.

Thanks to our friends at Proskips for this post on construction waste and recycling. They offer skip hire across the UK.

The Environmental Effects of Construction Waste

Construction waste creates pressure across several environmental systems. Understanding those effects is the first step to managing them responsibly.

Landfill pressure and resource depletion

Landfill space in the UK is finite and increasingly scarce. Even with a non-hazardous construction and demolition recovery rate of 94.3% in England (2022), several million tonnes still weren’t recovered and went to landfill or other disposal, per government waste data. Every tonne landfilled at the standard Landfill Tax rate of £130.75 represents both an environmental cost and a direct financial one.

Soil and water contamination

Not all construction waste is inert. Disposing of hazardous materials improperly, or leaving non-hazardous waste unmanaged on site, can have consequences well beyond the immediate location. Solvents, oils, adhesives and chemically treated timber can leach harmful substances into surrounding soil and groundwater, affecting local ecosystems and, in some cases, drinking water sources.

Hazardous materials: a separate legal obligation

Some construction materials are classified as hazardous waste under UK law and must be handled separately from general site waste. Common examples include:

• Asbestos and asbestos-containing materials
• Lead-based paint
• Treated or preserved timber
• Adhesives and solvents
• Oils and lubricants
• Certain types of insulation or plasterboard

Businesses have a legal duty of care to identify, store and dispose of hazardous waste through authorised facilities. Mixing hazardous waste with general construction waste is not permitted and can result in enforcement action.

Reduce

The first step in cutting the amount of waste that ends up in the landfill is simply to reduce the quantity you produce in the first place. With a little careful planning, you can greatly reduce the amount that ends up in a skip. Here are some suggestions:

• Encourage designs that produce less waste.
• Avoid over-ordering materials.
• Use standard sizes and quantities of materials to reduce offcuts.
• Arrange for materials to arrive on site to match the work stages, to limit the chances of them being damaged through bad storage.
• Ensure storage areas are secure, safe and weatherproof.

With Landfill Tax currently at £130.75 per tonne for most waste (HMRC/GOV.UK), reducing the amount you produce also has a direct effect on project costs.

Reuse

In today’s industry, it’s simply unacceptable to throw away perfectly good materials. Surplus or salvaged materials should be stored in a safe place and used again, either on the same site or on another project. This is better for the environment and helps to cut costs. The following materials can be reused:

• Bricks and tiles (damaged items can be crushed).
• Inert materials (concrete, soils, stones and asphalt).
• Paint.
• Timber and wooden pallets.
• Plasterboard.
• Packaging.

Recycle

Recycling is crucial to prevent valuable materials ending up in the landfill. In England, 94.3% of non-hazardous construction and demolition waste was recovered in 2022 (Defra/GOV.UK).

The key to successful recycling is to segregate waste as you go, using different skips or containers for different materials. If you don’t have the space to do this, use a reputable waste company who will remove and sort your waste for you.

These are the most common recyclable construction materials and their uses:

• Wood is recycled for energy generation. It’s also used for animal bedding, mulch for gardens and golf courses, landscaping pellets and chipboard for new kitchen units.
• Inert materials such as bricks, concrete, soil and stones are crushed and used to produce aggregate materials and new concrete or asphalt.
• Plasterboard is expensive to throw away but can be reprocessed to make new plasterboard.
• Metal can be recycled to make new high-quality metals, a process that uses less energy than making metals from scratch.
• Cardboard and paper can be shredded for animal bedding or house insulation and can be used to make biodegradable coffins.
• Plastics waste can be recycled for use in construction projects, or to make street signs and landscaping materials.
• Glass can be recycled for multiple uses, including aggregate in concrete, and insulation.

Segregating construction waste materials for recycling is a simple action that goes a long way towards reducing the amount of unnecessary waste in the landfill, helping to minimise environmental damage and cut costs on construction projects.

Frequently asked questions

If you would like to read more, see our health and safety articles for businesses.