Ventilation is the key, any moisture laden air needs to be evacuated at source, so in bathrooms after bathing showering make sure the door is closed and open the window for 5 minutes after you have showered, extractors can help here. Same thing in kitchens, keep the door shut when cooking and use extractors or open a window. If your property has concrete floors and ceilings (a flat for example) and is double glazed the moisture from everyday living has nowhere to go apart from the coldest surface in your property (your concrete lintels) in an older house with a sprung floor and chimneys there are lots of opportunitys for the air to escape (exchange)but in modern dwellings there are not so many opportunities. Consider a dehumidifier. When drying clothes use one room for this, dont scatter damp clothes over all radiators, use an airer in one room and kep the door shut and the window open a bit to allow an exchange of air.