Engineering-Led Energy, Compliance & Building Performance Consultancy

Zerith’s energy efficiency consultants are true multi-disciplinary specialists, not single-skill auditors. They work alongside your teams to understand how your buildings, processes, and people actually operate—then design solutions that deliver real, measurable performance improvement.

Rather than producing standalone reports, our consultants combine technical expertise, operational insight, data analytics, and compliance knowledge to create innovative, practical solutions that can be implemented and sustained. This includes energy management, audits, process optimisation, digital tools, and Net Zero strategy.

Most importantly, Zerith consultants focus on capability building, not dependency. By working collaboratively with your teams and leveraging the ZECO AI platform, we embed knowledge, unlock innovation, and deliver long-term energy efficiency gains—well beyond a traditional consultancy engagement.

The honest answer: it depends on what you're willing to implement and how quickly.

You can start saving within weeks through operational improvements like BEMs optimization, heating controls, and lighting schedules. These typically require minimal investment and can deliver 5-15% reductions immediately.

Within 3-12 months, low-cost measures like LED upgrades and heating system optimization can add another 10-25% savings with paybacks under 3 years.

Beyond 12 months, capital projects like heat pumps, HVAC replacements, and renewables deliver the deepest savings (30-60%+) but require planning, funding, and longer payback periods.

What makes Zerith different:

Traditional consultancies spend 8-12 weeks producing reports before any action begins. Our platform enables your team to start implementing quick wins from week one while we simultaneously develop your longer-term strategy.

You're not paying for reports that sit on shelves—you're building capability that delivers immediate and sustained value.

Bottom line: Quick wins within weeks. Meaningful savings within months. Transformational change within 1-3 years. And unlike traditional consultancy, your team owns the capability to keep finding and delivering savings long after our engagement ends.

The cost of an energy consultancy in the UK varies depending on the scope of work, number of sites, and whether the focus is on compliance, technical audits, or long-term energy strategy.

As a general guide:

• Hourly or daily rates typically range from £600 to £1,500+ per day for experienced consultants

• Compliance schemes such as ESOS, SECR, or CCA commonly cost between £3,000 and £20,000+, depending on organisational size and complexity

• Broader energy strategy or Net Zero consultancy for multi-site organisations can run into the tens of thousands of pounds annually

For many organisations, these costs are recurring, as consultants are re-engaged each compliance cycle or audit period.

At Zerith, we take a different approach. By using the ZECO AI platform and enabling internal teams to self-deliver compliance and performance activity, organisations can reduce external consultancy costs by up to 70%, while gaining better visibility, control, and long-term value from their energy data.

Zerith’s ZECO AI sustainability platform provides a single, standardised system for managing energy, carbon, and compliance across one or multiple sites.

The platform guides internal teams through data capture using information already held within the organisation, then applies AI-driven structure and validation to produce consistent insights and compliant outputs. ZECO supports schemes such as ESOS, SECR, CCA, and Heat Networks, while also tracking energy performance and carbon reduction over time.

By centralising data, standardising processes, and embedding knowledge within teams, ZECO reduces reliance on external consultants, lowers costs by up to 70%, and gives organisations long-term control over their sustainability and Net Zero journey.

Yes. ESOS Phase 4 compliance is a core part of the Zerith offering.

Zerith supports ESOS in two flexible ways, depending on how much control and capability you want to retain internally:

1. The Zerith Approach (Self-Delivery, Supported)
Using the ZECO AI platform, Zerith enables your internal teams to manage data capture, analysis, and ESOS submission using information already held within your organisation. We provide training, guidance, quality assurance, and the required sign-off—reducing reliance on external consultants and lowering costs by up to 70%.

2. Traditional Consultancy Delivery (End-to-End)
For organisations that prefer a conventional approach, Zerith can deliver ESOS Phase 4 in full. Our team will complete the energy audits, analysis, and reporting, and manage the submission process on your behalf.

Whichever route you choose, Zerith ensures ESOS Phase 4 compliance is delivered accurately, efficiently, and in a way that supports your wider energy management and Net Zero objectives—not just a tick-box exercise.

Yes. Zerith works extensively across the public sector, supporting organisations with complex estates, tight budgets, and demanding compliance requirements.

Our experience includes NHS estates, custodial environments, defence sites, and education portfolios, where energy performance, resilience, and regulatory compliance are critical. We understand the operational, governance, and funding challenges unique to public sector organisations.

Zerith supports public sector clients through energy management, compliance (including ESOS and SECR), building and process performance improvement, and deliverable Net Zero pathways—using a partnership approach that builds internal capability while delivering measurable cost and carbon savings.