Types of construction waste: the UK professional’s guide
What are the main types of construction waste under UK law?
UK construction and demolition waste is classified using the European Waste Catalogue (EWC) system, which assigns a six-digit code to every waste stream. That code, not a descriptive label, determines your legal disposal obligations and duty of care liabilities. Getting it wrong exposes you to enforcement action and significantly higher disposal costs.
The most common construction debris types and their EWC codes include:
- Concrete — EWC 17 01 01 (non-hazardous unless contaminated)
- Bricks — EWC 17 01 02 (non-hazardous in standard condition)
- Tiles and ceramics — EWC 17 01 03
- Untreated timber — EWC 17 02 01
- Metals — EWC 17 04 series (steel, copper, aluminium, and others)
- Excavated soil — EWC 17 05 04 (non-hazardous) or 17 05 03* (hazardous if contaminated)
- Plasterboard/gypsum — EWC 17 08 02
- Plastics — EWC 17 02 03
- Glass — EWC 17 02 02
- Hazardous bituminous mixtures — EWC 17 03 01* (coal tar-containing)
The asterisk (*) denotes hazardous waste. Under UK duty of care obligations, every waste producer must classify waste accurately, store it safely, use only authorised carriers, and document each transfer with a waste transfer note recording the description, volume, and destination.
Pro Tip: A pre-demolition survey is the most reliable way to identify hazardous materials before work begins. Gcscontractors recommends commissioning one on every strip-out or demolition project — see the pre-demolition survey guide for a structured approach.
Table of Contents
Common building waste materials: what you will find on site
Concrete, bricks, and masonry
Clean concrete and brickwork are non-hazardous under EWC 17 01 01 and 17 01 02 respectively, and both carry strong recycling routes: crushed as aggregate, used as sub-base material, or processed into new concrete products. The challenge arises with older structures. Concrete or brick containing coal tar, asbestos, or lead falls under EWC 17 01 06*, requiring specialist handling that goes well beyond visual inspection. Testing is not optional on pre-1980s buildings.
Timber and wood products
Untreated structural timber (EWC 17 02 01) can be recycled into engineered wood products, mulch, or compost. Treated timber, including posts, decking, and railway sleepers containing preservatives or creosote, is a different matter entirely and must be managed as hazardous waste. On demolition sites, nails and fasteners can complicate recovery, though large-section timbers are often worth denailing and replaning for reuse.
Metals
Metals across the EWC 17 04 series, covering steel, copper, aluminium, and brass, are among the most straightforward recycling construction materials on any site. They carry genuine commodity value, so segregating them properly pays for itself. Lead is the exception: EWC 17 04 03 classifies it as hazardous, and lead-based paint debris adds further complexity during strip-out.
Excavated soil and groundwork arisings
Soil is one of the most variable waste streams in groundwork and civil engineering. Clean, uncontaminated material sits at EWC 17 05 04 and can often be reused on site or transferred to another project. Contaminated soil, classified at EWC 17 05 03*, requires laboratory testing to confirm hazardous substance levels before any disposal decision is made. Mixing the two creates a single hazardous load, which is both a regulatory and a cost problem.
Plasterboard and gypsum
Gypsum warrants particular attention on mixed demolition sites. When plasterboard contacts biodegradable waste in landfill, it produces hydrogen sulphide gas, a hazardous reaction that can reclassify an entire load. Keeping gypsum (EWC 17 08 02) segregated from mineral waste is a legal requirement, not just good practice. Separate collection skips are the practical solution on most sites.
Plastics and glass
Plastics (EWC 17 02 03) and glass (EWC 17 02 02) are non-hazardous in clean condition but contamination quickly changes their disposal route and cost. Segregating these materials at source keeps them recyclable and avoids landfill gate fees on mixed loads.
Hazardous mixtures and specialist waste
Coal tar-containing bituminous mixtures (EWC 17 03 01*) appear regularly on road and car park demolition projects. Contaminated soil, lead flashing, and materials containing asbestos or mercury all require specialist contractors and site hazard identification before removal begins. Mixing any of these with non-hazardous waste means the entire consignment is treated as hazardous, with disposal costs rising sharply as a result.
| Waste type | EWC code | Hazard status | Recommended route |
|---|---|---|---|
| Concrete | 17 01 01 | Non-hazardous | Crush and recycle as aggregate |
| Bricks | 17 01 02 | Non-hazardous | Recycle as fill or sub-base |
| Contaminated concrete/brick | 17 01 06* | Hazardous | Specialist disposal |
| Untreated timber | 17 02 01 | Non-hazardous | Recycle or reuse |
| Glass | 17 02 02 | Non-hazardous | Recycle |
| Plastics | 17 02 03 | Non-hazardous | Recycle where market exists |
| Metals (general) | 17 04 series | Non-hazardous | Commodity recycling |
| Lead | 17 04 03 | Hazardous | Licensed disposal |
| Clean soil | 17 05 04 | Non-hazardous | Reuse on site or transfer |
| Contaminated soil | 17 05 03* | Hazardous | Laboratory test, specialist disposal |
| Gypsum/plasterboard | 17 08 02 | Non-hazardous | Segregated collection, recycle |
| Coal tar bitumen | 17 03 01* | Hazardous | Specialist disposal only |
Gcscontractors manages waste classification and segregation across strip-out, demolition, and groundwork projects as standard. For a detailed look at compliant demolition practice, including waste handling protocols, the Gcscontractors resource library covers the full process.
Working with a contractor who understands EWC classification from day one reduces both your legal exposure and your disposal bill. Gcscontractors brings that compliance focus to every project, whether strip-out, demolition, or groundworks. Visit gcscontractors.co.uk to discuss your next project.
Key takeaways
Accurate EWC classification is the single most important step in managing construction waste compliantly and cost-effectively in the UK.
| Point | Details |
|---|---|
| EWC codes govern disposal | Every waste stream needs a six-digit EWC code; the code, not the material name, sets your legal obligations. |
| Segregation controls costs | Mixing hazardous and non-hazardous waste reclassifies the entire load as hazardous, increasing disposal costs significantly. |
| Gypsum needs its own skip | Plasterboard mixed with mineral waste produces hazardous landfill gas and can trigger reclassification of the whole load. |
| Duty of care requires documentation | Waste transfer notes must record description, volume, and destination for every consignment leaving site. |
| Old structures carry hidden hazards | Pre-1980s concrete, brick, and timber may contain asbestos, coal tar, or lead, requiring testing before classification. |