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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

Morning everyone, I have made an offer on a piece of land subject to satisfactory sub-soil survey which I need to get done. I am keen on exploring the idea of adding a basement to the build and need to get a survey done that gives me sufficient information. Naturally, I want to save as much money as possible as well. I also want to have all the information I need to them get quotes, work out costs, etc., to then decide whether or not I want to build a basement. I've read posts where people have had to get a second survey and I want to avoid such costs. This is all new territory for me so any advice and information will be very helpful, including recommendations for good companies who serve the North London area. Questions that come to mind: To what depth do the samples need to be taken from? How many holes need to be dug and where? What details do I need to have included in the report? I'm sure there's more. The plot is at the end of a terrace so there's a pavement and then a road next to it. My goal is to include a basement under the main footprint of the house which is about 11 metres long and 6 metres wide. There will be a further 2.5 metres between that and the border of the property/pavement where I will try to get permission for a single story side extension separately. I'm attaching a picture of the outline of the property. Any other general advice for this stage will be helpful. Thanks