Can You Sell a House with a Septic Tank? What You Need to Know

Selling a Property with a Septic Tank

Yes, you can absolutely sell a house with a septic tank — but since the General Binding Rules came into force in January 2020, conveyancing solicitors now routinely check septic tank compliance as part of the property transaction process. Being prepared can mean the difference between a smooth sale and months of delays.

What Buyers' Solicitors Will Ask

When selling a property with private drainage, expect the buyer's solicitor to request:

• Confirmation of the drainage type — septic tank, cesspit, or sewage treatment plant
• Where the system discharges — drainage field, watercourse, or stored (cesspit)
• Proof of compliance with the General Binding Rules (if applicable)
• Maintenance records — emptying receipts, service records
• Waste transfer notes — proving waste was disposed of by a licensed carrier
• Details of the drainage field — location, size, condition
• Tank age and condition — any inspection reports or assessments

This information is typically requested through form CON29DW (the drainage and water search) and the TA6 Property Information Form.

Common Issues That Delay or Derail Sales

1. Tank Discharges to a Watercourse

This is the most serious issue. Since 2020, septic tanks in England must not discharge into rivers, streams, or ditches. If yours does, the buyer's solicitor will flag this as a compliance failure. You'll need to either:

• Replace the tank with a sewage treatment plant (£4,000–£10,000)
• Redirect the discharge to a drainage field (if soil conditions allow)
• Connect to the mains sewer (if available within 30 metres)

Some sellers negotiate a price reduction to cover the cost of work rather than doing it themselves before the sale.

2. No Maintenance Records

Buyers want assurance that the system has been properly maintained. If you can't produce emptying receipts or service records, the buyer may:

• Request a professional tank inspection (at your cost)
• Negotiate a price reduction as a contingency
• In rare cases, withdraw from the purchase

Start keeping records now — every emptying receipt and waste transfer note adds value to your property file.

3. Failed or Waterlogged Drainage Field

A drainage field that shows signs of failure — waterlogging, sewage surfacing, foul odours — is a significant concern. Replacing a drainage field costs £2,000 to £5,000, and buyers will expect this to be reflected in the sale price.

How to Prepare Your Property for Sale

If you're planning to sell a property with a septic tank, take these steps in advance:

1. Book an emptying — a freshly emptied tank makes a much better impression during a survey
2. Gather your records — collect all emptying receipts, waste transfer notes, and any installation or service records
3. Check compliance — confirm your tank discharges to a drainage field, not a watercourse
4. Walk the drainage field — check for waterlogging, odours, or surface sewage
5. Consider a professional inspection — this costs £100–£300 and gives you a report to share with buyers proactively

Being proactive about compliance shows buyers that the property has been well maintained and can significantly speed up the conveyancing process.

What If the Tank Is Non-Compliant?

If your septic tank doesn't meet current regulations, you have several options:

Many sellers find it more cost-effective to fix the issue before listing rather than having it discovered during conveyancing, which can lead to renegotiation from a weaker position.

Does a Septic Tank Affect Property Value?

A compliant, well-maintained septic tank system typically has no significant negative impact on property value. Rural buyers expect private drainage and understand the maintenance requirements. However, a non-compliant system or one in poor condition can reduce the asking price by the cost of remediation — typically £3,000 to £10,000.

Need to get your tank in order before selling? Get a free quote for emptying and assessment from a local operator.