An energy audit is a structured, end-to-end review of how your buildings and sites use energy – from equipment and systems to daily operations and consumption patterns. By combining data analysis with on-site surveys, it identifies where energy is being wasted and highlights opportunities to improve efficiency.
The outcome is a clear, practical report showing what to fix, what to improve and what it will save – helping you reduce costs, boost performance and support your sustainability goals. A high-quality audit also provides the evidence needed for mandatory compliance schemes such as ESOS and SECR, giving you a solid, data-led foundation for your wider energy and carbon strategy.
For large organisations, energy assessments may be required under the Energy Savings Opportunity Scheme (ESOS), which runs in phases and requires a compliant assessment and evidence pack.
For SMEs, they’re optional, but often incredibly valuable. Even a single audit can uncover hidden inefficiencies, reduce costs and create a structured path for long-term energy management.
An audit is especially worthwhile if:
Whether you operate a single site or a complex multi-site portfolio, the scope is fully tailored to your business, ensuring you get insight that’s relevant, actionable and aligned with your goals.
We start by gathering and analysing your energy data - invoices, half-hourly profiles, BMS trends and sub-metering where available. This highlights how your sites use energy, reveals unusual patterns and helps us agree which systems and processes to focus on during the on-site review. The result is a clear baseline and a targeted approach that avoids time wasted on low-value areas.
We visit site to review how key systems actually operate in practice – HVAC, lighting, controls, compressed air, process loads and other significant energy users. We speak with site teams to understand constraints, comfort requirements and operating patterns, then identify no- and low-cost improvements (setpoints, scheduling, control strategy, maintenance actions) alongside larger opportunities where capex is justified. The outcome is a clear list of practical measures with indicative costs, savings and paybacks.
We then prioritise each opportunity based on savings potential, payback, ease and operational impact. Measures are grouped into practical projects with clear business-case inputs, and we outline how progress can be tracked through KPIs, monitoring and regular reviews. The outcome is a practical roadmap aligned with your budgets, net-zero goals and wider energy strategy.
Clear visibility of where energy is used and wasted, helping you reduce consumption, improve performance and cut long-term cost.
A prioritised set of engineered actions with quantified savings and carbon impact, supporting credible progress toward Net Zero.
Evidence and outputs that support ESOS, SECR and internal reporting, giving you a data-led foundation for investment decisions.
Practical recommendations that improve reliability, comfort and control—designed to work in the real world, not just on paper.
Our team prioritises your satisfaction, providing personalised solutions and expert guidance to ensure a seamless experience that exceeds expectations every time.
Join our extensive network of existing customers who have benefited from substantial cost savings through tailored solutions and strategic approaches.
Our proven strategies and dedicated support has already helped our existing customers save more than £3.2m on their energy bills. Join us and discover how much you could save.
An energy audit reviews buildings, plant, processes and controls to identify where energy is being wasted and how to fix it.
An audit is useful if:
DES tailors the scope to single sites or complex portfolios.
No. Most work is observational and coordinated with site teams to avoid disruption to production or operational activity.
Yes. DES supports business cases, supplier selection, installation and verification of savings.
Most organisations benefit from an audit every 1–3 years or after major operational changes.
