We have an old end terraced house. With the heavy rain we have water coming through our concrete floor.?

You are going to have to put in some sort of drainage system against the house. It sounds like you will need to do some grading to make the outside level lower than the house.

You really need to hire technical engineer to design a system that will work with your soils and situation.

You say that the stair banister is embedded into the concrete? Did the previous owners pour another slab on top of the original trying to stop the water? If they did I would remove the second slab because your sills are going to rot from the concrete to wood contact.

there is a TEMPORARY solution to seal the concrete floor. purchase a product called brakewater 700/ silasec and a bag of cement follow instructions to make waterproof putty and push into cracks/joints etc. really get it into the cracks, push it in with a blunt stick scraper etc. this will stop the problem on a temporary basis, there is no substitute to fixing the real cause, which appears to be a higher ground level outside. recommend you call a waterproofer and obtain a quote. good luck and a happy new year

Re directing water away will definitely make a difference in keeping a dry basement. I found that installing a sump pump was the best thing for my old home. I removed water from under the floor and even reduced some floor bulging. We were able to enjoy our basement worry free after that. If you are concerned about power failure, there are battery back up systems and even a water powered unit. (you must be connected to city water since a power outage would render your well supply useless)

the leak is caused by pressure build up under the concrete floor, water takes the easiest path, my floor leaked when it rained hard, so i took a 1/4 drill bit and drilled a hole in my floor drain until you hit rock or dirt, it looked like a fountain spewing up about a foot until the pressure was relieved, that was about fifteen years ago no leak since

I had this problem too and solved it by adding downspouts to my gutters. The downspouts carried the water farther away from the house and the basement floor doesn't leak anymore. I'd at least try this before spending alot of time and money digging.

Dig 3-4 feet down next to the foundation and put a layer of plastic sheeting then rock then plastic tile drain pipe then rock to cover that. Then back fill. Make sure you drain the water from the pipe away from the house.

edit=== the plastic tile drain pipe with holes in it.

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