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Energy Modelling Software

Faster HEM modelling. Better project insight.

Vulcan helps teams create, check and analyse detailed Home Energy Model inputs faster for design decisions and building regulations compliance.

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Customers include

DESNZ logo
Energiesprong UK logo
FES logo
Etude logo
Knauf Energy Solutions logo
Savills logo
VOR logo
Archio logo
Building Energy Experts logo
Energy House 2.0 logo

Product capabilities

Home Energy Model software for faster modelling and better design decisions.

HEM has many more inputs than SAP, and its outputs can change design decisions rather than simply confirm compliance. Vulcan makes HEM inputs faster to create, more auditable and easier to turn into design insights.

Model faster

Create HEM inputs faster

Import or trace geometry, reuse defaults and bulk-edit repeated inputs to cut modelling time.

  • Trace plans or import CAD

    Trace plans quickly, or start from CAD geometry.

  • Auto-create thermal bridges

    Generate junctions from geometry, then inspect and edit them.

  • Suggest ductwork and pipework

    Get suggested MVHR duct and primary pipework runs, then add one or all of them.

  • Pro

    Share and work together

    Share by email or with your whole organisation, follow each other's cursors live, and restore a recent save. Anyone you share with can view; Pro members can edit.

  • Bulk edit models

    Update repeated values across elements, models and project batches.

  • Apply project defaults

    Reuse U-values and model assumptions across similar dwellings.

  • Pro

    Customise editor

    Adjust themes and naming to suit your preferences.

Check earlier

Catch issues before submission

Spot geometry, schema and SAP differences while they are still quick to fix.

  • Validate 3D elevation

    Use the 3D view to spot base heights, window dimensions and shading issues.

  • Run automatic checks

    Catch geometry and schema issues before late rework.

  • Compare SAP files

    Compare SAP PDFs or XML to the HEM model to add or vary elements.

  • Pro

    Review draft submissions

    Attach evidence, request review and resolve comments before submission.

  • Pro

    Choose your HEM version

    Run simulations on the HEM:FHS version you choose. ECaaS submissions need the default version.

Explain better

Turn HEM outputs into design decisions

Run unlimited local simulations, compare scenarios and inspect the half-hourly detail behind compliance results.

  • Pro

    Test design scenarios

    Set up fabric, system or operating changes. Run unlimited local simulations.

  • Understand granular detail

    Review half-hourly outputs to better understand compliance results.

  • Add project-specific metrics

    Count unmet demand hours or define custom checks with SUMIFS and COUNTIFS.

  • Add and test tariffs

    Test project-specific energy prices in cost metrics.

Connect tools

Connect Vulcan to your wider workflow

Keep HEM model data usable across local files, spreadsheets, APIs and AI models.

  • Work with local files

    Models, SAP data and outputs live in a normal folder on your machine. Models you share, with their SAP files and overlays, also save to Vulcan.

  • Edit via spreadsheet

    Move geometry through a documented CSV format you can open in Excel.

  • Enterprise

    Integrate via API

    Connect lodgements, dwellings and evidence to project systems.

  • Pro

    Use AI models

    Use AI models to set up scenarios, run simulations and summarise results faster.

Trusted by Energy Professionals

Leading organisations are using Vulcan

Working with Vulcan has been a great experience. As we've begun developing and testing models of properties, the support from the Vulcan team has been invaluable. They've been responsive, knowledgeable, and proactive in helping us understand and prepare for HEM.
Energiesprong UK
Zack Gill and Beck Hartley
Vulcan was very easy to learn and use. It made it much faster to create a reliable model by streamlining the key steps. The Vulcan team were extremely responsive, clarifying differences compared with SAP, and addressing any questions or feedback we shared. Working with Vulcan has genuinely helped us prepare for the introduction of HEM.
Savills Earth
Alexandros Chalkias and Dan Jestico
Vulcan's interface helped us generate baseline models quickly before moving into more detailed parametric analysis. Vulcan was responsive throughout, including resolving issues specific to our institutional setup and acting on our feedback. Vulcan has grown significantly in capability over the past year, showing a technically strong team that listens.
Salford Energy House
Richard Fitton

Latest Insights

Stay updated with the latest energy modelling insights, tutorials, and industry analysis.

Technical9 min read

Introducing Vulcan Open Source

Vulcan's editor for importing, creating, editing and validating Home Energy Model inputs is now open source and free forever to use, with a Pro tier for professional workflows.

Opinion12 min read

How to use the HEM transition well

What Vulcan and Savills Earth's HEM vs SAP analysis suggests about using the transition period to reduce compliance, workflow and energy-use evidence risk.

Opinion9 min read

Vulcan's take on FHS and HEM consultation responses

The Future Homes Standard and Home Energy Model consultation responses make clear why firms should prepare for HEM now, not later.

View all posts

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