The Township of Wellesley maintains current street maps for the entire Township and each of the settlement areas within it.
List of street maps
Other mapping resources
With the Region of Waterloo's GIS Locator you can view property lines and current air photos for any area within the Region of Waterloo.
With the Grand River Conservation authority's mapping, you can view your property and see if it is in the floodplain, contains wetlands, or otherwise environmentally constrained.