Bad plumbing in new-ish house?

bjorn_toby_wilde

You’re normally responsible for the foul water sewer from your property to where it joins the main sewer (which is the responsibility of the water company).

The first call should be to the water company, not a plumber. They will normally send someone out to inspect and deal with the issue the same day and there should be no charge if it’s in the shared sewer.

Don’t forget that the water company’s sewer can run on your property. If it serves 6 houses for example and runs under the back gardens of all of them you would only be responsible for the branch from your house to the inspection cover.

GDB2222

https://www.nhbc.co.uk/warranties/buildmark

Jumblebumble

Ectophile said:

If the problem turns out to be in a drain that's shared with your neighbours, then it's probably the water company's problem.

If it's in a drain that only serves your house, you'll need to call a drain expert.

Top tip
my understanding is that some water companies will come an fix as a paid job even if they are not responsible
This will likely be far cheaper than an independent
 The last time I have a blockage I called out the water board and the man who came said it was not their responsibility. However he said that for £40.00 he would plunge it which I accepted.