CPD: Materials management plans

UK construction is under growing pressure to deliver projects more sustainably while simultaneously reducing waste, lowering carbon emissions and controlling escalating development costs. Developers and contractors are increasingly expected to demonstrate responsible resource management alongside regulatory compliance.

While the CL:AIRE Definition of Waste: Development Industry Code of Practice (DoWCoP) is often associated with the movement of materials between sites, many of its greatest benefits are realised on brownfield developments where excavated materials are reused entirely within the same site planning boundary. 

Whether soils are being regraded, processed, treated or relocated to engineered fill areas, a materials management plan (MMP) provides the framework for demonstrating that those materials remain a valuable resource rather than becoming waste.

A significant opportunity lies in the management and reuse of excavated materials. Traditionally, large volumes of soils and made-up ground generated during construction projects have been disposed of as waste, often at substantial financial and environmental cost. This led to the development and now widespread adoption of DoWCoP, which has transformed the way excavated materials are managed across the UK construction sector.

At the centre of this framework is the MMP. When properly implemented, an MMP can significantly reduce landfill disposal, minimise imported fill requirements, improve project sustainability credentials and generate major commercial savings. For many projects, effective materials management is a core component of successful construction delivery rather than simply an environmental add-on.

DoWCoP was developed by CL:AIRE in collaboration with the Environment Agency and industry stakeholders to provide a clear framework for the reuse of excavated materials.

Under waste legislation, excavated soils and made ground can automatically become classified as waste once removed from their original position. Once classified as waste, materials become subject to extensive regulatory controls covering storage, transportation, treatment, permitting and disposal.

The DoWCoP framework provides an alternative route whereby materials can remain outside waste regulation provided certain conditions are met. In simple terms, the framework allows excavated materials to be reused as a resource rather than discarded as waste.

To comply with DoWCoP, materials must satisfy several key principles:

Since its introduction, the DoWCoP framework has become firmly established across UK construction and brownfield redevelopment.

An MMP is a project-specific document that sets out how excavated materials will be managed, assessed, tracked and reused during construction works.

The plan demonstrates that materials are being reused in a controlled and sustainable manner rather than being discarded as waste.

An MMP is typically prepared during the pre-construction phase and evolves throughout the project as further information becomes available from site investigation, earthworks operations and validation activities.

The level of detail required will vary depending on the scale and complexity of the development, but a compliant MMP generally includes:

The MMP effectively becomesthe operational framework governing how materials are managed throughout the construction process. 

Many MMPs are prepared for projects where every tonne of excavated material remains within the site boundary. This is particularly common on brownfield developments where remediation works require soils to be excavated from one area of the site before being reused elsewhere as part of the permanent development.

Examples include:

In these situations, the materials have been excavated and moved from their original position. Without an appropriate management framework, there is a risk they could be considered waste.

An MMP provides the documented justification demonstrating that the materials have a clear purpose, are suitable for their intended use and are being managed in accordance with the DoWCoP principles.

One of the primary drivers behind the adoption of MMPs is the significant cost associated with offsite disposal.

Landfill tax rates increase annually, while disposal capacity in some regions has become increasingly constrained. In addition to landfill charges, projects must also absorb:

By enabling materials to remain on site for beneficial reuse, an MMP can dramatically reduce these costs. On large earthworks projects, the commercial savings can be substantial and may significantly influence overall project viability.

Construction remains one of the UK’s largest consumers of raw materials and producers of waste. Reusing excavated materials plays a major role in reducing the environmental impact of development by cutting the volume of material sent to landfill, reducing demand for virgin aggregates, limiting vehicle movements and fuel consumption, and lowering the carbon emissions associated with transporting waste and imported fill.

Effective materials management also supports wider industry objectives around achieving net-zero carbon, embedding circular economy principles and demonstrating strong environmental, social and governance (ESG) performance. In addition, it can contribute towards BREEAM and other sustainability assessments while promoting more responsible and efficient use of natural resources.

Increasingly, clients and public sector bodies expect demonstrable sustainability performance as part of procurement and project delivery, as a result of the Procurement Act 2023.

In addition, the availability of disposal facilities and imported aggregates can create programme risks for construction projects, particularly during periods of high development activity.

Where projects rely heavily on offsite disposal, delays can occur due to limited landfill availability, haulage shortages, regulatory restrictions, or capacity limitations at treatment facilities.

An effective MMP reduces dependence on external waste infrastructure and allows contractors greater control over earthworks operations and material logistics.

For developers, contractors, regulators, insurers and investors, environmental compliance is now a major consideration. A properly implemented MMP demonstrates that excavated materials are being managed responsibly and in accordance with recognised industry guidance.

Robust documentation can also provide important protection in the event of future regulatory scrutiny or legal challenge.

The reuse of materials under DoWCoP does not end once earthworks are completed.

Verification and validation are essential to demonstrate that the works were carried out in accordance with the MMP.

Typical validation evidence includes photographic records, earthworks records, material movement logs, as-built drawings, validation sampling results and, where applicable, certification for imported materials.

This information is often incorporated into final verification or validation reports submitted to regulators or planning authorities.

A defining feature of the DoWCoP framework is the requirement for oversight by a qualified person (QP).

The QP is an independent competent specialist who reviews the MMP and confirms that it complies with the requirements of the DoWCoP.

The QP does not supervise the works directly, but provides an independent declaration confirming that the proposed materials reuse strategy is appropriate.

Projects operating under DoWCoP generally require the QP declaration to be completed before material reuse activities commence.

Despite the benefits of the DoWCoP framework, implementation challenges remain common across the construction industry. 

One of the most frequent problems is the late consideration of materials management during project design.

Where earthworks and remediation strategies are developed too late, projects often miss opportunities to maximise reuse and minimise disposal. Thus, early engagement between project stakeholders is essential.

DoWCoP compliance also relies heavily on accurate records. Missing testing data, incomplete movement logs, or poor validation evidence can create compliance risks and potentially invalidate the reuse strategy.

Projects should establish clear document control procedures from the outset.

Furthermore, failure to segregate materials correctly on-site can compromise reuse opportunities.

Mixing clean and potentially contaminated materials can lead  to increased disposal requirements and additional testing costs.

Site teams must understand the materials management strategy and maintain strict operational controls throughout the site work.

Unexpected contamination or variable ground conditions remain a significant challenge, particularly on brownfield developments.

The MMP should therefore include contingency procedures covering unexpected contamination discoveries, additional testing requirements, temporary quarantine procedures, and alternative disposal routes where necessary.

Projects that achieve the greatest success with MMPs typically adopt several common best-practice principles:

Materials management should be viewed as an integral part of project delivery rather than a standalone environmental exercise.

As landfill costs continue to rise and sustainability expectations intensify, the ability to manage materials efficiently will become increasingly important across the sector.

For developers, contractors and consultants, effective materials management is no longer simply good environmental practice, it is a fundamental requirement for successful project delivery.