Understanding the Home Energy Model (HEM)
From policy to performance — how developers can stay compliant and future-ready under the Future Homes Standard
Aligned by Design
Bringing the Home Energy Model to Life
The Home Energy Model marks a shift from theoretical assessment to performance-based validation. Hubb.Pro mirrors this approach — using dynamic, probabilistic simulations to replicate real-world conditions. Our platform helps developers test design scenarios, compare system strategies, and prove compliance early, so projects are ready for HEM before it becomes mandatory.
Turning HEM Data into Design Decisions
Hubb.Pro’s simulation engine is built on the same logic that underpins the Home Energy Model.
By combining real weather files, hourly data, and behavioural variability, it bridges the gap between compliance and constructability — helping teams plan, optimise, and verify energy performance with confidence.
Dynamic Design
System Diversity
Model how different homes interact across a single network.
Hourly Simulation
Reflect true performance under realistic operating conditions.
Variable Occupancy
Capture how usage patterns affect demand and capacity.
Design Optimisation
Find the most efficient, compliant pathway for every site.
Technology Comparison
Test heating, renewables, and control strategies side by side.
Compliance & Validation
HEM Alignment
Produce outputs structured to match HEM’s performance methodology.
Carbon Accuracy
Track emissions under grid decarbonisation and seasonal variation.
Evidence Generation
Supply transparent, data-backed reports for planners and investors.
Capacity Forecasting
Anticipate electrical demand and future connection needs.
Regulatory Readiness
Demonstrate compliance with upcoming FHS-linked benchmarks.
Why the Home Energy Model (HEM) Matters
From Estimates to Evidence
The move from SAP to the Home Energy Model represents a fundamental shift in how energy performance is measured and demonstrated.
Dynamic, Not Static
Where SAP relied on monthly averages and fixed assumptions, HEM introduces hourly, data-driven simulation. It accounts for how homes are actually used — changing weather, occupant behaviour, and the interaction between heating, storage, and generation systems.
Design Decisions That Count
For developers, this means design choices made at the earliest stages will have a direct impact on compliance outcomes. System sizing, grid capacity, and renewable integration will all need to be considered together — not as separate steps later in the process.
Turning Complexity Into Clarity
Hubb.Pro helps bridge that gap, turning complex modelling into clear, actionable insight for design teams, planners, and consultants.
Core Platform Capabilities
Hourly Energy Simulation
Model performance on an hourly basis to capture real-world variation in weather, occupancy, and energy use — exactly as the Home Energy Model does.
Behavioural Variability Modelling
Account for the real-world differences in how homes are occupied and used. Simulate heating, hot water, and appliance demand patterns that reflect genuine diversity across dwellings.
Future Homes Standard Alignment
Built around the same principles as the upcoming regulatory framework, ensuring every design pathway remains compliant and future-proof.
Data-Led Design Confidence
Instantly compare options for cost, capacity, carbon, and compliance — helping developers make confident decisions backed by dynamic simulation data.
Hubb.Pro enables smarter, faster decision-making at every project stage through a single, data-driven source of truth.
Transforming Housing Development
Project Stages
From early viability and scenario appraisal to detailed design and delivery.
Analysis Tabs
Capacity, Cost, Compliance, Carbon, and Comfort — integrated and always evolving.
Stakeholder Value
Transparent collaboration across developers, consultants, and providers, built on shared, evidence-based insight.
A high-tech yet user-friendly platform that simplifies complex trade-offs in housing energy strategy — helping teams achieve optimal outcomes while fostering clarity and collaboration from feasibility through to completion.
Home Energy Model (HEM): Key Questions Answered
Your practical guide to understanding what HEM means for developers, designers, and contractors.
What is the Home Energy Model (HEM)?
The Home Energy Model is the UK government’s new methodology for assessing the energy performance of homes. It replaces SAP and uses hourly, data-driven simulations to evaluate how heating, lighting, and renewable systems interact in real-world conditions. The model supports more accurate predictions of energy use, carbon emissions, and compliance under the Future Homes Standard.
When will the Home Energy Model replace SAP?
HEM is expected to come into effect alongside the Future Homes Standard in 2025–2026. Transitional arrangements are likely, but developers beginning design work now should start aligning their specifications and data models to HEM’s dynamic approach to avoid costly redesigns later.
How is HEM different from SAP?
While SAP uses monthly averages and fixed assumptions, HEM operates on an hourly basis and reflects variation in weather, occupancy, and energy use. It can model renewable integration, EV charging, and battery storage with far greater precision. This allows more realistic outcomes and encourages smarter system design from the earliest stages of planning.
What does HEM mean for developers and house builders?
HEM will make early-stage energy modelling critical. Developers will need to validate MEP strategies earlier in the design process, using real-time data and capacity-based simulations. Hubb.Pro’s modelling tools already follow this approach — helping developers stay compliant while optimising for cost, carbon, and connection efficiency.
How does Hubb.Pro help projects prepare for HEM?
Hubb.Pro applies data-led optioning and probabilistic simulations that mirror HEM’s methodology. By simulating multiple energy scenarios, we help identify compliant, cost-effective, and capacity-optimised solutions before designs are locked in. This reduces rework, de-risks approvals, and improves confidence in project viability.