Thank you for your enquiry to the Municipal Property Assessment Corporation (MPAC).
The structure measurement we have on file is an exterior measurement of your house. In other words, if you were to measure around the outside of your house with a tape measure, that is the measurement we would use, not including any attached garage, deck or porch.
This may be different from your structure floor plan, which may reflect the interior or room to room measurement.
Please visit our web site at www.mpac.ca or contact us at 1 866 296-MPAC (6722) if you have any questions.