The downloads listed on this page provide the latest interfaces to all UK NCMs and Ireland NEAPs. If you require a previous interface for an existing Building Regulation calculation, please check the Previous Versions page.

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• For a free evaluation install DesignBuilder then select Help->License... and click the Evaluate button. Enter your contact details and you will be emailed an evaluation code valid for 30 days.
• If you have a previous version of DesignBuilder installed you must uninstall it from Control Panel -> Add or remove programs before running this download to install the new version.