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Nan's bathroom

My Nan's bathroom has water damage around her shower floor area due to water getting under the shower tray and possibly in the walls were needing a builder to do a Winz quote on how much it will cost to fix any water damaged floor/wall, to even the whole bathroom floor surface and to install our new shower. Our current shower is 900 × 900 mm and the new shower my Nan wants installed is 900 × 1200 mm . Note: the vanity in pics won't be in the bathroom. Thanks in advance