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Hi guys Would really appreciate any advice on building a big basement with indoor pool (400sqm, 3m high ceilings, 10m*4m pool) The swimming pool would have 1m below ground and 50cm above ground level Early considerations include: the plot is a 1.1acre and luckily there are no considerations of neighbouring boundaries etc access is good Ground investigations have been completed for my house, and the house next door, they show the same thing more or less, these can be uploaded as requested Without going into loads of detail, summary: Windlesham formation units: silty glauconitic sand to around 4.5m, then clay Encountered water around 2-2.5mbgl in areas (not everywhere) On the basis of the above shoring recommended, perhaps sheet piling needed (ground collapses around the dig quite fast in areas) dewatering needed (it looks like there is perched water around 2-2.5mbgl) We (the groundworks team and my appointed SE) have concluded so far that: We dig out 1.5mbgl - this area would be stable. Then dewater and pile below this (keeps piling cost down). We need to get to around 4.5-5.5mbgl for the basement (to include services etc and headlight approx 3m and 1m for the pool) Main areas of advice please to relate to potential costs of: Potential Piling needed Basement construction Also any recommendations of contractors around the Windlesham, Surrey area? I have received a quote from Glatharr prefabricated basements at around £500K (10 week build time) Other traditional builds are running at around £400K-£1mill! (4-6months build time) Prices include waterproofing and 10 year warranties etc Everyone so far has recommended against ICF, although the nudura rep seems to think its totally possible I think I want to go with the germans - because: They are German This is specialised work Basements leak in our area The house on top will only be as good as the basement below etc Much quicker build and I want to get on with the rest of the house BUT Is £500K a crazy price? Many thanks in advance for any help/advice Best Raju