Landlord drainage obligations: what the law expects and what tenants owe

What section 11 says

Under section 11 of the Landlord and Tenant Act 1985, a landlord must keep in repair and proper working order the installations for the supply of water, gas and electricity, and for sanitation, which expressly includes basins, sinks, baths and sanitary conveniences, and the drains serving them.

This cannot be contracted out of in a standard assured shorthold tenancy. A clause making the tenant responsible for drain repairs does not override it.

Where tenant liability genuinely arises

A tenant must use the property in a tenant-like manner. A blockage clearly caused by misuse, wipes, sanitary products, cooking fat poured down a sink, can reasonably fall to them.

The practical difficulty is evidence. A blockage cleared without anyone recording what came out is very hard to attribute afterwards. If you intend to recharge, ask the contractor to record the cause. We note it as standard because it comes up constantly.

What is never the tenant’s: a collapsed clay drain, root ingress, a shared run, or a defect that predates the tenancy.

Houses in multiple occupation

An HMO puts several times the normal load through pipework sized for one household: more bathrooms, more laundry, more kitchen use, more wipes and fat. Blockages are more frequent and that is a design reality rather than a tenant failing.

For HMO landlords, planned inspection is materially cheaper than reactive call-outs, and it produces the maintenance record that licensing regimes tend to ask about. The pattern is heaviest in Clapham, Brent and Hackney.

Practical steps that prevent disputes

• Put in writing at the start of the tenancy what must not be flushed. One page prevents a lot of expensive call-outs.
• Fit strainers in baths, showers and sinks. They cost very little and remove most hair and food debris.
• Respond quickly to reports of slow drainage. A slow drain reported and ignored becomes an emergency and a disrepair complaint.
• Keep the contractor’s report. It is your evidence either way.

When it is not your pipe at all

Before recharging a tenant or paying yourself, check whether the fault sits on a shared run or beyond the boundary, in which case it is generally the water company’s responsibility. See who is responsible for a blocked drain.

In converted flats, the shared stack is usually the freeholder’s rather than any leaseholder’s: how that works.

If the problem is on your doorstep, we cover blocked toilets in Brent.