Expert guidance in Energy Efficiency, Decarbonisation and Building Performance
Specialist consultancy for Net Zero Carbon, Dynamic Simulation Modelling and Energy & Sustainability solutions across the UK and Europe
About BeLeaf Consulting
BeLeaf Consulting is an independent energy and sustainability consultancy supporting fellow consultancies and project teams to improve building performance, reduce carbon, and achieve Net Zero and ESG objectives.
We translate ambitious energy targets into clear, technically robust, and financially viable strategies for both as-designed and operational buildings.
Our work is grounded in engineering expertise and asset-specific analysis, ensuring practical, measurable outcomes aligned with real-world performance.
Working across the full asset lifecycle, we specialise in energy efficiency, decarbonisation and building optimisation, acting as a trusted technical partner through specialist modelling, independent review and additional technical capacity when required.
Jose Alvarez Arregui
Founder & Managing Director
Mechanical Engineer (MCIBSE, CEng) specialised in Energy Efficiency and Sustainability in Building Design
13+ years of experience in building physics and energy consultancy
Former Head of Building Physics at top-tier UK consultancies
Our Services
Comprehensive energy and sustainability consulting services to transform your buildings and achieve your Net Zero goals.
What sets us apart
We combine technical rigour with commercial thinking — because the best sustainability strategy is also the most financially sound one.
Profitability at the core
Every measure is assessed for economic return, not just carbon impact. Sustainability must make financial sense — and with the right analysis, it always can.
Competitive differentiation
Energy efficiency is not just regulatory compliance. It is a competitive advantage, a stronger commercial proposition and long-term protection of asset value.
High-level technical rigour
CEng MCIBSE, IES VE, CIBSE methodologies. Every recommendation is grounded in real asset data and advanced energy modelling — not generic reports.
Fully independent
No commercial affiliations, no product bias. Our advice is always aligned with the client's technical and financial interests — nothing else.
How we work
A structured, practical process — from initial building assessment through to implementation support.
Understand the building
We analyse consumption data, installed systems, operational schedules and technical constraints of each asset.
Identify real opportunities
We detect energy saving measures, carbon reduction potential and comfort improvements specific to each building.
Prioritise investment
We evaluate impact, estimated cost, payback period, complexity and implementation risk for each measure.
Define a roadmap
We deliver clear, phased strategies aligned with the client's sustainability targets and financial objectives.
Support implementation
We support clients through technical review, proposal validation and ongoing performance monitoring.
Projects & Results
Proven expertise across diverse building types and sectors, delivering measurable results for our clients.
Let's Work Together
Ready to transform your buildings into sustainable, high-performance assets? Get in touch to discuss your project requirements.
Book a Consultation
Schedule a free 30-minute call to discuss your sustainability goals.
Book a Call