The Building Services Portal is here to shine a light on the ‘dark art’ of building services engineering. The guidance and design tools have been produced by UK based Chartered CIBSE Engineers and are designed for anyone from DIY amateurs to fellow building services professionals and architects. Our most popular design tools include the water efficiency calculator (for demonstrating Part G compliance), the pump sizer and fan sizer spreadsheets. We have been helping engineers and architects for over 5 years now, and have adapted and expanded our products to suit the market demand.