Commercial Office Gatwick
Commercial office suite within a multi-tenanted landmark airport complex, featuring 1980s curtain-wall envelope modeling and high-efficiency heat pump integration.

📝 The Project
Accurately modeling an independent office suite situated within Concorde House, a major multi-wing commercial complex serving London Gatwick Airport. In standard SBEM software, sub-demise assessments in larger commercial buildings require precise boundary mapping to separate conditioned spaces, party elements, and external envelope interfaces without incurring unnecessary thermal penalties.
Our Approach & Solution
Certus Commercial conducted a comprehensive site audit and tailored thermal modeling strategy:
Complex Boundary & Envelope Modeling: Evaluated the 1980s curtain-wall structure, ensuring party wall boundaries and floor assemblies were correctly linked to standard NDEPC library records.
HVAC Performance Integration: Modeled high-efficiency Mitsubishi inverter heat pumps, accurately capturing seasonal heating and cooling efficiencies (SCOP/SEER) to optimize thermal output calculations.
Ventilation & Air Permeability Tuning: Applied NDEPC Convention 6.08 specific fan powers (SFP) for mechanical supply and extract systems, while aligning infiltration rates to the pre-1995 building age band.
🏢 Property Type:
Commercial Office (Sub-Demise)
📐 Building Size
62 m²
🏛️ Building Classification
B1 Offices and Workshop Businesses (SBEM Level 4)
🎯 Reason for Assessment:
Lease Renewal post Referbishment / Commercial Letting
📊 EPC Rating:
B
🛠️ Additional Services:
📍 Location:
Gatwick, West Sussex (RH6)
✅ Project Outcome:
Sub-demise assessment within a landmark multi-tenanted airport complex, navigating 1980s curtain walling and heat pump system integration.
Project Outcome
Accurate modeling of the high seasonal efficiency heat pumps—combined with precise envelope and ventilation boundary setup—delivered an outstanding asset rating.
MEES Compliance: Exceeds current and proposed Minimum Energy Efficiency Standards, maximizing leaseability for the asset manager.
Client Impact: Secured an optimal energy rating that reflects the true efficiency of the installed building services while fulfilling full NDEPC audit compliance.




Further Resources
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Need a Commercial EPC?
Whether you're selling, letting or refinancing a commercial property, Certus Commercial provides fast, professional EPC assessments across Sussex and the South East.
"Needed an urgent Commercial EPC for our premises in Bexhill-on-Sea and couldn't be happier with the service. George moved his schedule around to fit me in immediately and had the full report completed with incredible turn-around time. Professional, knowledgeable, and extremely efficient. Highly recommend!"
Jake - Property Developer

