My architect just came out to review our extension before certifying it meets the building regulations and planning permission. All is well bar one item – ventilation. We need to add ventilation in three rooms.
Options seem to be either drilling holes in walls and fitting ventilation grills (not the prettiest), or retro-fitting trickle vents into the frames of the white uPVC windows.
Does anyone have any thoughts on vents built into the window frames? If anyone knows a company that does them (company I got the windows from don’t do them) and will retro-fit, I’d appreciate any info.