Older properties do tend to have damp problems, usually in the ground floor walls. In more serious cases, the damp will rise and may also affect rooms higher up the house.
It is common for a period property not to have damp proof courses or floor membranes. They also typically have had modern gypsum and cement applied to the walls internally and externally over the years. These non-breathable products trap the moisture within the walls; this is the cause of almost all damp problems.
The good news in that by using traditional lime materials, you can eliminate the damp by allowing the walls to breathe and the moisture to evaporate. This will involve the removal of all modern cement and gypsum. External stone walls often look nice left exposed, but if you decide to replace your render, we would do this using natural lime plasters and renders.
For more information about damp issues within older properties, please visit my other Advice pages.