Do UK Homes Make Allergies Worse? 

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Thank you, very informative. I don't live in the same region so the building tendencies are different but I still feel like the components that go into building are a bit less mysterious now

I wonder if it's the case that after some period of time the off-gassing from these products becomes tolerable? Kind of in the way that new paint smell dies down. Or is it a problem for eternity? Maybe an older property would be better than a new one for that reason, although they are more likely to be dusty. I know that modern properties with MHRV systems and/or air-air heat pumps or air conditioning often have air purifiers which can use HEPA filters that might help. I remember there was a Grand Designs years ago where a family in London built a hypoallergenic house and I think they used lots of concrete and an air purifier for that reason. Natural materials like clay based plasters and paints have a good reputation for allergy sufferers and also regulate moisture well. All of these solutions sound pretty bespoke and expensive though, and probably require retrofitting extensively or self-building. I don't know how good the portable air purifiers (like the stylish Dyson models) are but maybe they would help in the interim. I don't know if I have allergies per se but I am sensitive to dust, so I prefer not to live with wall to wall carpets and so on. Hopefully your client finds something suitable but finding anything at all with enough space at a reasonable price is the first challenge in the UK.