I've posted this in Chat as well, sorry, didn't realise there was a specific property thread and I think posters here may have some experience of this.
We have had some damp issues over the last few years which have now been resolved (something to do with lime plaster, unbreathable exterior masonry paint etc). I won't bore you with the details suffice to say these have now all been repaired, replastered etc.
One thing that came up was ventilation. There are no trickle vents on the windows and there are no ventilation bricks on the exterior walls. The windows are aluminium framed and very thin so can't fit them retrospectively I think? They are at least 20 years old as that is how long I've had the property but are absolutely fine apart from this one issue.
Do I need trickle vents or could I, for example, put a ventilation brick in the exterior wall rather than replacing windows? That would be a lot cheaper and would it effectively do the same thing?
Is there an easy, effective (and hopefully cheap) way of making sure the rooms are ventilated without having to replace the windows?
TIA