sips novice

Thanks so much everyone for your replies. To answer the queries: no, no pictures of VCL during construction unfortunately. sadly no room to retrofit an MVHR as there is no loft space. But we could always change the bathroom extractors for better ones. windows are by ID systems. Don't think they are humidity activated vents currently but good idea - I could change them if I can find them colour-matched. I reckon he must have been cost saving - but odd, because he chose to spend £14k on a bespoke front door...Priorities, priorities...! Thanks again

Hi everyone. Hope you don't mind me reaching out. I'm not a self-builder (yet -though I'd love to be sometime) but am hoping to buy a house built by a self-builder and would appreciate some thoughts. The house is built using SIPS - and it's the first time this builder has used them. It is 3000ft2 and on the EPC it has an air tightness reading of 2.9m3. But there is no MVHR - just trickle vents, so I'm worried about air quality, condensation and mould (though there is none there visible currently). I asked the guy why he didn't put in an MVHR and he said that he didn't want the smells of BBQs from neighbouring properties being drawn in, and that the bathroom extractor fans have a background ventilation setting. He also said he put more windows in to ensure enough trickle vents. But I'm struggling to get comfortable with this because everything online recommends a mechanical ventilation system when you build with SIPS. Any thoughts appreciated. Thank you.