What documents matter for private drainage when selling?

Private drainage is material information

Where mains drainage is not connected, buyers need clarity on condition, maintenance, and compliance with environmental protection rules. Poor evidence can delay conveyancing.

Documentation to assemble

Install and design pack: manufacturer model, capacity, location plan, and soakaway or discharge arrangement.

Emptying and service records: tanker receipts and service visits for treatment plants.

Mapping: site plan showing inspection covers, access routes, and any watercourses.

Environmental permits or registrations: where applicable for your area and discharge type.

Building regulations: where installation was notifiable.

Be explicit about shared systems with neighbours if any pipes cross boundaries.

Using Property Passport UK

Start from the address on [Property Search](/search). When you own or manage the home, [claim your Property Passport](/claim/start) and upload Documents with clear dates and sources. Browse more explainers in the [Property Guides library](/guides). This article is general information, not legal, tax, mortgage, or survey advice.