There is actually quite a range of sizes depending on the country of origin and its purpose... http://en.wikipedia.org/wiki/Brick Who knew! Nice to see you btw, missed you about the place lately.

Single - 250mm x 120mm x 65mm 1,5*Single - 250mm x 120mm x 88mm Double - 250mm x 120mm x 103mm In post-USSR countries

My current home is built with a standard Canadian metric size - about 70mm x 80mm x 230mm. However, bricks vary widely in size. Many of the sizes available are made to national or regional standards and can be different from those in other countries or in other regions within the same country. I worked in a brickyard for a few years, around the time that metric sizes were introduced in Canada (late 70s). The company produced, or had produced, several sizes, including: - Quebec size: about 8" long, with core holes or without (pavers). - Ontario size: slightly larger than Quebec size. - Norman: similar to Quebec, but 11" or 12" long. - TTW (Through-The-Wall): similar to Norman, but twice as deep for building free-standing walls. - Metric small. - Metric large: 40% or 50% longer than the metric small. Variations included double-width and bullnose bricks (rounded at one end for use at the outside corner of a wall). Bricks can be custom-made in a wide range of sizes. There are two stages in the production process that affect the size: - The size of the die that can be fitted to the extruder. - The spacing of the cutter wires. The die controls the maximum length of the face and header as the slug (extruded wet clay) exits the extruder. The slug has a smooth face and headers at this point. Various surface effects may then be introduced (e.g., wire-cut face, rough face, corduroy). The slug is chopped to length and the bricks are cut to width by a row of cutter wires. A double-width brick, for example, is made by removing every second wire.