I am very strict on this.
while living in the country one day my son said "what happened there Mum" and pointed to the ceiling. To my horror it was almost disintegrated -we had a beautiful pine ceiling in huge ranch style house.
It was white ants and in a week they had also gone to another area.
Luckily we had a barrier round the house and a contract so it only cost us to fix the actual timber and not to get rid of the white ants.
When I bought my city house I immediately had the firm from the country come down and instal the same system -quite unlikely to get them here but "once bitten, twice shy".
Every year they come and check thoroughly and spray for spiders.
Well worth the money I have spent after seeing how quickly white ants can destroy something.