For the last few years all the brands have standardised the distance between wall and toilet trap (hole) to be 9 Inches (210 to 220 mm). If your trap distance is set as this then you can replace it with the new model in 8 to 10 years without any civil work. Renovation becomes easy.

If you are renovating you might have to increase the existing pipe which could be 3 inches to 9 inches.

Buy original western toilets at wholesale price with bill and warranty at Better Home: 
Western Toilet - Parryware, Jaquar, Roca and Essco.

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