Life Cycle Assessment

Life Cycle Assessment (LCA) provides a quantified account of a building’s environmental burdens across its full lifecycle. This spans raw material extraction and manufacturing through to use, maintenance, and eventual demolition. Required under BREEAM Mat 01 and increasingly requested by planning authorities, LCA supports evidence-based material selection. It helps project teams demonstrate genuine whole-life sustainability credentials against embodied carbon targets.

Life Cycle Assessment (LCA) is a crucial tool for evaluating the environmental impact of buildings, materials, and construction methods.

Traditional assessment methods focus on operational carbon–the emissions produced by a building during its use. LCA goes further and examines embodied carbon, which includes the hidden emissions generated throughout a building’s lifecycle. These include raw material extraction and manufacturing to usage and disposal.

Incorporating LCA is crucial for evaluating the full environmental impact of buildings across their entire lifecycle. The LCA process thoroughly analyses every stage, from raw material extraction and construction processes to operational energy use and eventual demolition or recycling. This comprehensive approach uncovers the hidden environmental impacts and inefficiencies unique to each project.

For businesses and public sector clients in the UK, LCA provides valuable insights into adopting more sustainable building practices. It enables informed decision-making that reduces waste, optimises resource use, and lowers carbon emissions. This aligns with both sustainability goals and regulatory requirements.

Moreover, LCA plays a critical role in achieving certifications like BREEAM. It supplies the data needed to demonstrate a building’s environmental performance. This enhances sustainability credentials and supports the UK’s broader sustainability objectives.

The BREEAM UK New Construction 2018 guidelines emphasise the importance of LCA. The new credits related to low-carbon materials and the assessment of operational energy and water use. Specifically, the Mat 01 credit requires technical teams to conduct an LCA to ensure a comprehensive evaluation of a building’s environmental impact.

For projects aiming for BREEAM certification, conducting an LCA at the appropriate stages can contribute up to 10% of the total credits, making it a crucial part of the certification process.

At Build Energy, we specialise in conducting Life Cycle Assessments, particularly for projects targeting BREEAM certification. Our team guides you through the entire process, handling all necessary reports and calculations to meet BREEAM requirements.

Using approved software tools, we help you secure early credits during the concept design and pre-planning stages. We also revisit the LCA at the technical design stage. We also collaborate with your team to explore material substitutions that can reduce embodied carbon emissions.

BREEAM credits under the Mat 01 section are awarded as follows:

• Concept Design: Up to five credits and one exemplary credit are available
• Technical Design: Up to two credits and one exemplary credit are available
• Additional Credit: For aligning Life Cycle Costing (LCC) with Life Cycle Assessment

The LCA process includes four main phases:

1. Goal and Scope Definition

This phase sets the objectives and boundaries of the assessment. It defines which aspects of the product or construction method will be evaluated. The scope also determines which lifecycle stages to include, keeping the assessment focused and relevant.

2. Inventory Analysis

In this phase, we collect data on the inputs and outputs of the product or construction method. This includes information on material and energy use, as well as emissions throughout each lifecycle stage, providing the foundation for the assessment.

3. Impact Assessment

Here, we evaluate the environmental impacts based on the gathered data. We assess categories including resource depletion, greenhouse gas emissions, water usage, and waste generation. This helps quantify the product’s overall environmental footprint.

4. Interpretation

In the final phase, we review and analyse the results to draw conclusions about environmental performance. This step involves understanding the implications of the findings, identifying areas for improvement, and making recommendations to reduce environmental impacts.

LCA provides several key benefits for building projects:

1. Identifying Environmental Improvement Opportunities: LCA helps pinpoint stages in a building’s lifecycle with the highest environmental impacts. This enables stakeholders to target areas for improvement, such as choosing more sustainable materials or refining construction methods to reduce overall environmental impact.
2. Comparing Options: LCA allows for the comparison of different design choices, materials, and processes. By evaluating the environmental impacts of each option, decision-makers can select the most sustainable alternatives. The chosen solution thus offers the best environmental performance.
3. Meeting Regulatory Requirements: In the UK, LCA is often required for compliance with regulations and certification schemes like BREEAM. Conducting an LCA ensures adherence to these requirements and helps avoid penalties. It also demonstrates a commitment to environmental sustainability, enhancing the project’s green credentials.

In the UK, LCA is increasingly adopted by developers and designers being driven by the demand for sustainable buildings. As mentioned earlier, BREEAM, which is the most widely used rating scheme in the UK, incorporates LCA into its criteria.

Additionally, local authorities like the Greater London Authority (GLA) are leading the charge amongst planning authorities.

The GLA encourages Whole Life Carbon Assessments for major developments and mandates them for referable schemes. This ensures developers are considering both embodied and operational carbon emissions.

The Green Building Council’s Net Zero Whole Life Carbon Roadmap provides a clear trajectory for the industry and government towards a net zero future.

What is a Life Cycle Assessment and how is it used in construction?

A Life Cycle Assessment (LCA) is a standardised methodology for measuring the environmental impact of a building, product or material across its entire life – from raw material extraction and manufacturing through construction, operational use and demolition. In UK construction, LCA helps teams quantify embodied carbon, compare material options, satisfy BREEAM Mat 01 credits and meet planning requirements for low-carbon design strategies.

When is a Life Cycle Assessment required for a building project?

An LCA is mandatory for projects seeking BREEAM credits under the Mat 01 category, which awards points for demonstrating the whole-life environmental impact of materials and construction. Many planning authorities – particularly in London under GLA guidance – also require LCA as part of a sustainability statement for major developments. Requirements are growing as embodied carbon targets become standard planning conditions.

What methodology does a Life Cycle Assessment follow?

UK building LCAs typically follow EN 15978, the European standard for assessing the environmental performance of buildings. The assessment covers modules A (production and construction), B (use), C (end of life) and D (beyond boundary). Carbon impacts are calculated using Environmental Product Declaration (EPD) data, and results are benchmarked against industry targets such as the LETI and RIBA 2030 Climate Challenge carbon budgets.

How long does a Life Cycle Assessment take to complete?

For most new-build commercial or residential schemes, an LCA can typically be completed within two to four weeks from receipt of a design specification or bill of materials. The timeline depends on scheme complexity and completeness of design information. Build Energy works with design teams from RIBA Stage 2 onwards to ensure the assessment reflects live design decisions and maximises BREEAM credit potential.