Congratulations in order for the Ecovert Solutions team on site – all the work to make the existing bungalow and the new extension air tight paid off with a great result of 1.59 m3/m2.h – less than the target of 2.00 set by the AECB’s Carbonlite retrofit standard https://aecb.net/aecb-carbonlite-retrofit-standard/ The design of course looks at all details and junctions to ensure buildable air tight and thermal bridge free construction; but needs a careful and thorough team on site to do the physical work at all junctions.