Hi, I have a loft room that has no insulation.
Because it can get cold in winter tenants often close the hatch and leave it like that which can cause some damp condensation issues
If I understand correctly, it sounds as if you have a non-habitable loft space that is entered by a hatch.
Your tenants have access to the loft space, and you currently wish the hatch to remain open, to avoid condensation issues?
Yes, the loft should probably have some ventilation - soffit vents, tile vents etc., but many older houses don't have these and are perfectly fine.
By leaving the loft hatch open, you are going to cause more condensation issues in the loft, allowing warm moist air from the occupied areas to condense on the cool loft surfaces.
If the house has condensation issues with the loft hatch shut, then ventilation within the house can be looked at and if that fails, try a PIV unit.
In my experience of rented accommodation, loft spaces were always kept locked and out of bounds to tenants.
You may have issues allowing access to this non-habitable space whilst still conforming with a landlords fire safety responsibilities.
