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the buyers of our house have brought this up
Drainage and waste disposal: Approved Document H
If they are that fussed, they can buy insurance to indemnify themselves against any issues caused by possible non-compliance.
Waste pipe work is fairly easy though - route it, cut it, dry fit it, then solvent weld it.
NotThamesWater
Our bathroom and kitchen grey waste connect into the same pipe before going into the drain - this pipework was there when we bought the house. Is this compliant with building regs/planning as the buyers of our house have brought this up. If not how big of a job is it to fix?