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As I look again it probably is only 10 mm. Looks unfinished to me, BUT the main reason for asking is whether rain ingress would cause damage to render or inside house damp? What fo you think re potential damage. Thanks for help so far. This is one of about 7 pipe holes

Thanks for your help. But is it a necessity or a preference. My builders have left. Not sure if they’ve forgotten to go it?

Q. I have a number of waste pipes ( soil stack and general waste pipes) exiting through newly rendered external walls. The pipes have about 20mm gap round them . Should this void be filled or left. I think rain water may seep in?