LCA A5 reporting for construction site. A Practical Guide
The article below is a more extensive, in-depth guide to LCA A5.
For our complete guide to LCA A4 → click here.
If you preferred a shorter overview that covers both A4 and A5 → you can find it here.
What is LCA A5?
In a building’s life cycle assessment, the process is typically divided into modules following EN 15978. Module A5 covers the construction process stage, specifically: transport, on-site assembly, construction site operations, waste, and any energy used during construction.
In Denmark, this means we are responsible for documenting the climate impact from the construction phase, especially from activities and transport not already covered under A1–A3 or later operational and end-of-life phases.
Why A5 matters
- Stricter Danish Building Regulations
Under BR18/BR25, modules A4 and A5 must be documented. There’s also a specific limit for A4 and A5 — approximately 1.5 kg CO₂e/m²/year for transport and the construction phase. - Compliance and cost risk
Overlooking the A5 phase can lead to exceeding regulatory limits, extra documentation rounds, redesign, or even financial penalties.
What construction managers need to track for LCA A5 — a practical checklist
- Construction site energy
Track electricity and fuel use on site (machinery, heating, lighting, drying equipment, temporary offices). - Construction waste
Record waste quantities, transport to treatment, recycling vs. landfill. Material waste = extra CO₂. - Time and logistics
The longer the site operates with frequent deliveries and machines running, the higher the A5 impact. Efficient logistics reduce emissions. - Data and standard values
Use EPDs or national default values for transport, energy, and waste.
Note that:
- Only construction processes related to the building’s built-up area, cf. the BBR Executive Order, are included.
- Water consumption and the use of non-permanent materials during the construction process (in module A5) are excluded.
✓ Agree on data collection responsibilities with all subcontractors upfront
✓ Register consumption continuously, not at project end
✓ Keep all invoices and documentation organized by category
✓ Clearly document when actual data vs. table values are used
✓ Prioritize actual data for largest impact categories
How to make A5 reporting easier
Looking at the full A5 data list, it’s clear that reporting can become time-consuming: invoices from suppliers, fuel and electricity data, waste slips, transport distances, and constantly updated emission factors.
To reduce this workload, Acembee’s platform automates the parts of A5 that typically take the most time:
- On-site consumption tracking. Electricity and fuel can be monitored via IoT meters, so A5 energy data is collected continuously instead of reconstructed later.
- Structured, ready-to-use documentation. AI processes invoices, waste documentation, and meter data and converts them into A4/A5-ready reporting.
- Real-time CO₂ overview. Emissions are calculated automatically with updated factors, giving the team a clear view of progress against the 1.5 kg CO₂e/m²/year limit.
If you’d like a clearer picture of how much time this could save on your site, book a quick demo. It’s an easy way to explore whether this approach fits your setup.
Common pitfalls
- Underestimating temporary site energy (heating, drying, site offices, etc.) — it can add up fast.
- Using generic values without checking if they fit the site’s reality. Using defaults just to save time can make results misleading.
- Adding LCA too late: if A5 is considered only at the end, it’s often too late to optimize logistics or equipment use.
- Missing documentation: municipalities or clients may require proof for A5 — missing data means extra work.
- Using generic "mixed waste" categories instead of properly sorted waste fractions. Mixed waste has worse climate impact than sorted fractions
What if our A4 and A5 emissions exceed 1.5 kg CO₂e/m²/year?
Authorities advise a pre-dialogue with the municipality if special building conditions (e.g., labs, sports halls, industry) make compliance difficult. The municipality decides how (and whether) a non-compliant build can be legalised; the starting point is that limits must be met.
Non-compliance with §298 (including the 1.5 kg A4 and A5 limit) = violation of the Building Regulations. The municipality can require legalisation (administrative and/or physical changes) and fines may be imposed.
Strategies to reduce A5 impact
Energy Reduction
- Use electric-powered machinery instead of diesel
- Install motion sensors and automatic shut-off controls
- Use Energy Saving tool to reduce energy use off working hours
- Use solar panels for site energy production
- Connect to final building heating source early
- Reduce machinery idling and use multifunctional equipment
Waste Reduction
- Order exact material quantities (avoid over-ordering)
- Protect materials on site with proper covering
- Establish return agreements with suppliers
- Reuse formwork and temporary structures
- Sort waste correctly into specific fractions (lower emission factors)
Behavioral & Planning
- Train employees and subcontractors on energy-saving practices
- Involve all parties early in reduction planning
- Focus on economic savings alongside climate benefits
Who’s responsible
Which projects must comply with the new rules?
- If the building permit (or equivalent application) is submitted on or after 1 July 2025, then the new, stricter climate requirements (including the A4 + A5 modules and the 1.5 kg CO₂e/m²/year limit for construction processes) apply.
- If the application was submitted before 1 July 2025, then the rules in force at that time continue to apply. In other words, buildings in construction at 1 July 2025 may fall under the earlier regime provided their permit application was submitted before that date.
Most construction managers already have a full plate, coordinating suppliers, keeping the site running, handling safety, schedules, unexpected delays, and everything in between.
Adding detailed A4 + A5 reporting on top of that can feel almost impossible to fit into the day. That’s exactly why we built Acembee’s platform.
It collects the data automatically, organises it, and turns it into complete, regulation-ready LCA A4 and A5 documentation, while still leaving you fully in control of the results. You get the overview, the accuracy, and the compliance without the manual workload.
Book a demo and see how it works in practice.