We routinely work with other PH professionals to expand their capabilities and support delivery of their own projects. Indeed, seasoned professionals often engage us for highly technical advice they struggle to find elsewhere. We complement their role, filling in gaps in knowledge or experience to ensure projects meet the Passive House requirements. This is particularly the case with the Passive House modelling software (PHPP). Having helped developed the software, we have an intimate knowledge of PHPP and can readily adapt the calculation engine to the specific needs of each project.