If you live in a listed building, insurers typically want to know that grade or category of listing the building has. This is because the higher the grade or category the greater it may cost to repair damage.
The different regions of the UK have different rating systems:
In England and Wales
Grade I – Buildings of exceptional interest.
Grade II* – Particularly important buildings of more than special interest.
Grade II – Buildings of special architectural or historical interest (92% of all listed buildings).
Category A – Buildings of national or international importance, either architectural or historic, or fine little-altered examples of some particular period, style or building type.
Category B – Buildings of regional or more than local importance, or major examples of some particular period, style or building type which may have been altered.
Category C – Buildings or local importance, lesser examples of any period, style or building type, as originally constructed or moderately altered; and simple traditional buildings which group well with others in categories A and B.
In Northern Ireland
Grade A – Buildings of greatest importance to Northern Ireland including both outstanding architectural set-pieces and the least altered examples of each representative style, period and grouping.
Grade B+ – Buildings which might have merited Grade A status but for detracting features such as an incomplete design, lower quality additions or alterations.
Grade B – Buildings of local importance and good examples of a particular period or style. A degree of alteration or imperfection of design may be acceptable.