Well in my opinion LABC are rubbish, for a start you have to pay the first £1,500 of any claim as an excess like car insurance. Basically it means you never claim. NHBC has a minimum claim value above which it will pay all costs for remedial works but under this (a value determined by them) it declines claims under the warranty.
Your best hope is to get the housebuilder to do any works before the 2-year period is up.
LABC make hard work of any attempt top claim.
At the end of the day, if you can put up with the noise then do so but don't because you feel you are wasting anyone's time. Unlike me, they are being paid to do a job, which it appears has not been done properly!