I've recently had a porch built. They have been out 3 times to fix the floor which they admitted wanst done right,sealed the external drainage where the window meets the sill in order to try and stop water ingress.again admitted that wasn't right and removed it. They have built 4 stairs as per the architect drawing. The last stair requires an 8" step to get over the front door (each step is 6") and the bottom stair lands onto a slab at almost 30 degrees. I'm led to believe anything over 600mm requires a 1m sq landing and hand rail but he refuses to do this and blames the architects drawing. He is proposing I correct all the defects myself and deduct them from his bill with the exception of the stairs. I'm refusing to pay until it's fixed to building control standard and he is contacting his solicitor.