The short answer
A building footprint is the outline of a building at ground level seen from above, and its area is the ground-floor square footage. Insurance to value compares a building's limit of insurance with the cost to rebuild it. Premium leakage is premium an insurer should have collected but did not because rating information was wrong. The full list is below.
Building footprint · Footprint square footage · Site diagram (property diagram) · Plot plan · Plot map · Sketch diagram · COPE · Excess and surplus (E&S) lines · Builder's risk · Clear space · Aerial imagery · Machine-detected building outline · Parcel (tax parcel) · Building coverage · Insurance to value (ITV) · Underinsurance · Premium leakage · Coinsurance clause · Replacement cost value (RCV) · Actual cash value (ACV) · N/C (not covered) · Statement of values (SOV) · Errors and omissions (E&O) · Loss control · Exposure (fire spread) · Outbuilding (appurtenant structure)
- Building footprint
- The outline of a building at ground level as seen from above. Its area is the ground-floor square footage.
- Footprint square footage
- The area inside a building footprint: one floor. Upper floors and basements are not included.
- Site diagram (property diagram)
- A scaled plan of a property showing each building, its dimensions and its position relative to lot lines, streets and other buildings. Also called a plot plan, plot map or sketch diagram.
- Plot plan
- In insurance, a drawing of the property from above showing each building, its size and its position. Underwriters request one for complex commercial, E&S and high-hazard risks. Not the same as a surveyed plot plan filed for a building permit.
- Plot map
- Another name for a plot plan or site diagram, common for farm and rural properties with several buildings.
- Sketch diagram
- A drawing of the premises requested on an application or supplemental questionnaire; the same thing as a site diagram or plot plan.
- COPE
- Construction, Occupancy, Protection and Exposure: the four things an underwriter weighs when evaluating a property.
- Excess and surplus (E&S) lines
- Insurance written by non-admitted carriers for risks the standard market declines or cannot classify, such as unique occupancies, vacant buildings and high-hazard risks.
- Builder's risk
- Property insurance for a building while it is under construction.
- Clear space
- The open distance between buildings, or between a building and a hazard, that limits how far a fire can spread.
- Aerial imagery
- Photographs of the ground taken from aircraft or satellites, corrected so that distances can be measured on them.
- Machine-detected building outline
- A building footprint traced automatically from aerial imagery by a computer vision model, as opposed to one drawn by a person or measured on site.
- Parcel (tax parcel)
- The piece of land a county assessor maps and taxes as one unit. Parcel lines are approximate and are not a legal boundary survey.
- Building coverage
- The share of a lot covered by building footprints, shown as a percentage.
- Insurance to value (ITV)
- The relationship between the limit of insurance on a building and the cost to rebuild it. Insured to value means the limit matches the replacement cost.
- Underinsurance
- A limit of insurance that is less than the cost to repair or replace the property.
- Coinsurance clause
- A policy condition requiring the insured to carry a limit of at least a stated percentage of the property's value (often 80, 90 or 100 percent). If the limit is lower, a partial loss is paid in proportion.
- Replacement cost value (RCV)
- The cost to repair or replace property with new material of like kind and quality, without deduction for depreciation.
- Actual cash value (ACV)
- Replacement cost less depreciation. The usual valuation basis for older or lower-value buildings.
- N/C (not covered)
- A mark on the PropDiagram building schedule showing that a building was identified and is not insured.
- Statement of values (SOV)
- The list of locations and buildings on a commercial property policy with the value, construction and occupancy of each.
- Errors and omissions (E&O)
- Professional liability for mistakes in the service an insurance agent or broker provides, such as failing to place the coverage requested or placing inadequate limits.
- Loss control
- The inspection and advice an insurer or agency provides to identify hazards on a property and reduce the chance or size of a loss.
- Exposure (fire spread)
- The risk a building faces from a fire in a neighbouring building, judged largely by the distance between them.
- Outbuilding (appurtenant structure)
- A building on the property other than the main one: a detached garage, barn, shop, shed or pole building.
See how these come together in a building footprint report, or how they apply to insurance to value and premium leakage.
A PropDiagram report is a diagram and reference record. Measurements are approximate ground-footprint estimates from aerial-imagery-derived building outlines. A report is not an appraisal, survey, replacement cost estimate or insurance valuation; verify anything a decision depends on.