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I do have building plans from an extension we had built (which doesn't have the water issue) and they tried to keep the flooring design the same as the house. It consists of (top to bottom) Laminate flooring 22mm Chipboard 50mm Recitcel Eurothane (insulation) 125mm concrete slab with 1 layer A193 mesh top 30mm cover 100mm Recitcel Eurothane (insulation) 1200 gauge DPM 50mm sand blinding Foundations If the rest of the house is the same as the extension then I feel like the water must be in the concrete slab and/or 100mm insulation. So either DPM has a hole in it, or water is getting in over the top. I have checked the drains leading away from the property, all water levels way below ground level. Checked the downpipes and all look in tact and leading away from the property. I feel like it really doesn't need much rain to start hearing it so it must have a pretty direct path in. Not sure if water could be getting in between the walls? In that case I would expect to see water damage on the walls?

Sorry for delay in replies, have been out for work. I do not recall seeing any insultation. We had an extension put on the rear of the house a few years ago and so I was able to see the flooring. I wish I'd taken photos but from memory there wasn't any foam type insulation. That would seem to be the obvious answer, but not sure why it only occurs mainly at the front door/living room. Whatever way the water is getting in, it can clearly take the same route to exit the house. I don't and I don't remember seeing any insulation. I went to their sales office nearby but they said - conveniently - that they've changed the way they lay floors and the original site managers are no longer around. Basically no flex, although I do feel that since this has happened a few times in the past 2 years the floor in the lounge feels a bit like whatever is under the carpet is maybe a tiny bit warped? When I saw the flooring contractors laying the floor they put screed down, then cut plywood to go over the top of that. Then basically glue the laminate down (a quick check on youtube for "laying amtico spacia" seems like that is normal?). If I move away the gravel I eventually get down to some hard concrete type material (not smooth, but "chunky"). Probably about a foot. ...and Sparrowhawk replied: My thought too. If you can hear it as you move, how much flex are you feeling in the floor? As per the OP's description The construction of the flooring is (bottom up): Concrete Plastic Membrane Plywood Laminate (glued down) The 'squidge' appears to be occurring between the concrete and the plastic immediately on top of it. I don't think there is any suggestion that the concrete is moving. I agree. Also, the squidging noise doesn't occur at the walls, its always either in the centre of the room or hall/front door entrance. That could just be where it's pooling however. I may have the plastic under the plywood wrong actually. We had the same original contractor install flooring in our extension a few years ago and they used screed to level off then just put plywood and flooring down. What is the LA, I'm not familiar with that? Trying NHBC again, but first step is always asking for photos of any damage. Unfortunately(?) in my case it's based on sound rather than visuals. Really appreciating all the good suggestions here.

Tried NHBC but they said without visual water damage they wouldn't cover anything. The wheelchair accessible part of the path is just a gravelly substrate with lock-block on top. Not sure about insulation. Can't take up flooring easily as it is glued to underlying plywood with some water-tight adhesive (it's Amtico Spacia or soemthing like that). Probably not obvious from the photos, but there are drainage channels around the house already filled with gravel, show no signs of filling up. I will try to dig down a bit deeper and see if water is pooling. New build by Cala Homes, they have done hundreds of copy/paste designs in my area in the last years and are still actively building. Have asked a few neighbours but none so far seem to have the issue. Issue started to occur after 5 years of the house being built. Sloshing is only when walking around/putting pressure on an area of the floor (e.g. rocking from foot to foot to create pressure difference). Not sure how I would investigate if it's an issue with downpipes? Any suggestions? Only when moving about. Issue started to occur after 5 years of the house being built. That was my thought, given everything is still dry. Maybe DPC is chanelling from outside onto the DPM? No idea how I could check if DPM has failed short of digging a hole in my house!

The Problem I've got an issue whereby water is getting into my house whenever there is moderate-heavy rain. This is a new build from 2015. Current theory is that water is getting trapped between either the DPC and flooring or DPC and concrete underneath. I suspect it is coming in via the front door area, but there is no visual evidence of water ingress anywhere. However, walking around there is a very audible sloshing under the floors. But the flooring itself (including carpets) is bone dry. The builder is not very helpful as warranty period is passed so I'm on my own. No signs of damage anywhere that would clearly point to ingress and only occurs during periods of rain (so think that rules out pipe issues). The Pictures The construction of the flooring is (bottom up): Concrete Plastic Membrane Plywood Laminate (glued down) I've tried to make a schematic below of where the water can be heard in the house. I believe it enters at the front and then is channeling/pooling at low points. The heavier the rain, the further into the house the sloshing can be heard and then drains away after a few dry days. The garage which is at a lower level is bone dry. I've investigated for cracks, poor/broken sealant, any way the water can get in but can't find any. I removed the lock-blocks at the threshold and concrete is still intact with no obvious damage or cracks. Front path is level. If I move aside some of the gravel at the side, there is the DPC visible. Not sure if this is a possible entry point for water? The garage (white door on left) which is at a lower level than the front door is completely dry, even during heavy rain. There is no pooling of surface water anywhere. Everything is very level (build to wheelchair standards).