A Specifier's Guide to Responsible Natural Stone Sourcing

Natural stone is one of the world's oldest building materials, valued for its durability, longevity and natural character. It can also offer relatively low embodied carbon, but the environmental impact of one natural stone can be very different from another depending on where it is extracted, processed and how far it travels before reaching the project.

Responsible specification therefore goes beyond choosing a stone for its appearance and technical performance. Understanding its provenance, processing route, transport impacts and verified environmental credentials can help architects make better informed material choices.

A Specifier's Guide to Responsible Natural Stone Sourcing has been created to help architects and specifiers ask the right questions, understand the information provided by stone suppliers and consider the complete journey of a material from extraction to project.

Why Specify Natural Stone?

Natural stone offers a combination of durability, longevity and low embodied carbon. Unlike many manufactured materials, it requires comparatively limited processing from extraction through to the finished product.

Research published by MPA Dimension Stone identified an average A1 to A3 carbon impact of approximately 0.09 kgCO₂e/kg across the natural stones reviewed.

Its long service life and potential to be reclaimed, recut, refinished and reused can further support responsible material selection.

What is Responsible Natural Stone Sourcing?

Responsible sourcing means looking beyond the appearance and technical performance of a stone to understand where it comes from and the journey it takes to reach the project.

This includes considering where it is extracted, where it is processed, how it is transported and whether independently verified environmental information is available.

For architects and specifiers, greater transparency makes it easier to compare materials and make informed choices based on both performance and environmental impact.

Don't just ask what the stone is. Ask where it has been.

Where Was the Stone Extracted?

Understanding exactly where a stone was extracted is an important part of responsible specification. Knowing the actual quarry of origin provides greater transparency and traceability, rather than relying solely on a stone name or stated country of origin.

It also provides the starting point for understanding the stone's complete journey from extraction to project

Ask for the origin of extraction, not just the country of origin.

Where Was the Stone Processed?

Knowing where a stone was extracted does not necessarily reveal its full journey. Stone can be transported elsewhere for processing before being shipped to the project, adding considerably to the distance travelled.

The MPA report highlights this with a modelled example of Brazilian stone transported to China for processing before reaching the UK, demonstrating why the processing location should form part of responsible sourcing decisions

Ask where the stone was processed, not just where it was extracted.

How Far Has the Stone Travelled?

Transport can have a significant impact on the carbon footprint of natural stone. The distance travelled, route taken and combination of road and sea transport should therefore be considered as part of responsible specification.

The MPA Dimension Stone naturally low carbon report demonstrates how substantial this difference can be. Under the study's weighted transport scenarios, Portland Limestone recorded approximately 36 kgCO₂e per tonne, compared with approximately 451 kgCO₂e per tonne for Portuguese Moleanos Limestone.

A natural stone may be low carbon to produce, but transporting it long distances can significantly change the picture.

Understanding Embodied Carbon

When comparing the carbon impact of building materials, it is important to understand which stages of their life cycle are included in the figures.

For natural stone, the initial stages are typically:

A1 Raw material extraction
A2 Transport to the manufacturer
A3 Manufacturing and processing
A4 Transport to the construction site

Carbon figures should always be compared on a like for like basis, with the same life cycle stages included.

Always check what is included in a carbon figure before making a comparison.

Look for Verified Environmental Evidence

Environmental claims should be supported by clear, independently verified information wherever possible.

Environmental Product Declarations provide standardised information on a product's environmental impacts and allow specifiers to better understand and compare materials.

Responsible sourcing and environmental management certification can provide further evidence of how the stone is extracted, processed and managed throughout its supply chain.

Look beyond environmental claims. Ask for the evidence behind them.

Is There a Suitable British Stone?

When selecting natural stone for a British project, consider whether a technically and aesthetically suitable British stone could meet the project requirements before specifying an imported alternative.

Where appropriate, sourcing closer to the project can shorten the supply chain, improve transparency and reduce transport-related carbon emissions.

Before specifying an imported stone, ask whether a suitable British alternative is available.

Choosing the Right Stone for the Application

Responsible specification also means selecting a stone that is technically suitable for its intended use. Different applications place different demands on the stone, from exposure and loading to slip resistance, weathering and appearance.

The stone's technical performance should therefore be considered alongside its provenance and environmental credentials.

Whether specifying cladding, masonry, stone bricks, paving, flooring or bespoke architectural stonework, the material should be selected to suit the particular application and project conditions.

A responsibly sourced stone must also be the right stone for the job.

Responsible Natural Stone Specification Clause

Natural stone should be selected with consideration given to its provenance, environmental impact, technical suitability and complete supply chain.

The supplier should be able to identify the quarry of origin, principal processing location and transport route to the project. Where independently verified environmental information is available, this should be provided to support the specification.

Where imported stone is proposed, consideration should be given to whether a technically and aesthetically suitable British stone could meet the project requirements with a shorter and more transparent supply chain.

The specification should consider not only what the stone is, but where it comes from and how it reaches the project.

How Albion Stone Supports Responsible Specification

Throughout this guide, we have highlighted the importance of understanding where a stone is extracted, where it is processed, how far it has travelled, the environmental evidence available and whether it is technically suitable for the intended application.

Albion Stone can provide this information at every stage, offering architects and specifiers a transparent British supply chain from quarry to finished stone.

Our Portland Stone is extracted and processed in Britain, supported by verified environmental information, technical data and specification guidance. For British projects, this provides architects with a durable natural stone with clear provenance and a considerably shorter journey than many imported alternatives.

Standard Specifications

Ready to specify Portland Stone?

Download our NBS aligned standard specifications for a range of Portland Stone beds and applications.