Blocked Drains in Andover Rental Properties - Common Causes and How to Get Them Fixed

Published October 2026 | Blocked Drains

Blocked drains are one of the most reliably contentious issues in the rental sector. Water backs up in the shower, the kitchen sink stops draining, or the outside gully overflows - and within hours, both landlord and tenant are arguing about who's picking up the bill. The answer depends on what caused the blockage, and that's not always obvious without a proper look at the drainage system.

Our engineers deal with drainage callouts across Andover and the wider Hampshire area on a regular basis, and the same patterns come up time and again. This guide breaks down the legal position, the common causes, and the practical steps both landlords and tenants should take when a blocked drain becomes a problem in a rental property.

Landlord Obligations Under Current Regulations

The legal starting point for any repair dispute in a rented property is the Landlord and Tenant Act 1985, specifically Section 11. This places a clear duty on landlords to keep the structure and exterior of a property in repair - and that includes the drainage pipes, gutters, and external drains serving the property.

In practice, landlords must:

• Maintain the main drainage infrastructure, including underground pipes, inspection chambers, and connections to the public sewer
• Fix blockages arising from structural defects such as collapsed or cracked pipes, root ingress from trees, or deterioration caused by the age and condition of the pipework
• Address drainage issues that make the property uninhabitable or unusable
• Respond within a reasonable timeframe - for a complete drain blockage affecting a kitchen or bathroom, that typically means 24 to 48 hours, not several days

The Housing Health and Safety Rating System (HHSRS) adds another layer. A blocked drain that causes flooding, sewage backup, or damp can constitute a Category 1 hazard, giving local councils the power to issue improvement notices. If those are ignored, councils can arrange the works themselves and recover the cost from the landlord.

For landlords managing properties in Andover, it's also worth understanding the distinction between private and public drains. Shared drains serving more than one property are typically the responsibility of the relevant water authority rather than the individual landlord. Southern Water manages the public sewer network across much of Hampshire, so blockages in public sewers are their remit - report them to Southern Water directly rather than engaging a private contractor.

What Tenants Are Expected to Handle

Tenant responsibility covers blockages that result from how the property is used day to day. Most tenancy agreements make this explicit, but even where the wording is vague, common law principles apply.

Tenants are generally expected to:

• Avoid pouring fat, oil, and grease down kitchen drains - these cool in the pipes, set solid, and accumulate into serious blockages over time
• Use drain covers or hair catchers in showers and baths, and clear them regularly
• Only flush toilet paper - not wet wipes (including those marketed as "flushable"), cotton wool, sanitary products, or nappy liners
• Keep outdoor gullies reasonably clear of leaves and garden debris, particularly in autumn
• Report drainage problems promptly rather than waiting until they become a serious blockage

If a drainage engineer attends a callout and finds the cause is a build-up of cooking grease, wipes, or other items that should not have gone down the drain, the tenant can typically be held liable for the cost. A simple drain rod clearance typically costs between 80 and 150 pounds. A stubborn blockage requiring high-pressure water jetting can reach 250 to 300 pounds, and if the situation has been left to worsen, costs climb further still.

The critical word is "caused." If a tenant has used the drains responsibly but the system still blocks due to an underlying structural problem, responsibility shifts back to the landlord. Blocked drains can start as a nuisance and turn costly fast - and assigning responsibility to one party alone is rarely as clean-cut as it first appears.

Grey Areas - Where Disputes Happen

The most common source of landlord-tenant friction around drainage is causation. Who actually caused the blockage? In a property that has been tenanted for three years, is the fatberg in the kitchen drain the result of the current tenant's cooking habits, or was it building up before they even moved in?

Some of the most frequently contested scenarios include:

Tree root ingress: Roots from trees in the garden or on neighbouring land can work their way into drain joints and cause serious, recurring blockages. This is almost always a landlord responsibility because it's a structural issue entirely outside the tenant's control. If a CCTV drain survey shows roots have been growing unchecked for years, that strengthens the tenant's position considerably and weakens any attempt to apportion blame.

Shared or communal drains: In converted flats and HMOs - of which there are a number across Andover and the surrounding area - multiple households share the same drainage stack. When that blocks, pinpointing which tenant contributed to the problem is often impossible. Landlords typically carry the cost in these situations, which is precisely why regular maintenance inspections are worthwhile rather than reactive-only management.

Pre-existing problems: A tenant who moves into a property with partially blocked drains and reports them promptly is in a clear position - they are not liable. A tenant who notices a drainage problem and ignores it for months while it deteriorates is in murkier territory. This is exactly why prompt reporting and written documentation matter so much to both parties.

Old or degraded pipework: Clay drainage pipes common in older properties are prone to cracking and joint failure over time. If the pipes themselves are failing, careful tenant behaviour alone won't prevent blockages from recurring. The landlord is responsible for maintaining the integrity of the pipework, and repeated blockages in an older property are often a sign that the infrastructure needs proper assessment rather than another temporary clearance.

How to Report This Issue - Tenant Perspective

If you're a tenant in an Andover rental property dealing with a blocked drain, the way you report it matters almost as much as reporting it at all. Done properly, it protects your legal position and gets the problem resolved faster.

1. Document the problem first. Take photos or a short video showing the blocked drain, any water backing up, and the condition of the surrounding area. Your phone timestamps this automatically, which matters if a dispute arises later.
2. Report in writing. Text or message your landlord or letting agent, then follow up with an email. Do not rely solely on a phone call. You need a written record of when you reported it and what you said.
3. Be specific. State exactly which drain is affected, when you first noticed the problem, and whether it's getting worse. If there's a sewage smell or water backing up into a room, say so clearly - that changes the urgency.
4. Follow your tenancy agreement's repair reporting process if one is specified. Deviating from it can complicate your position later.
5. Set a reasonable deadline. A blocked drain affecting your ability to use a bathroom or kitchen is urgent. Asking for acknowledgement within 24 hours and a repair appointment within 48 to 72 hours is entirely reasonable for a serious blockage.
6. Escalate if there's no response. Contact the letting agent's management team, then the local authority's environmental health department. They have powers to intervene where drainage issues create a health hazard in a rented property.

If you think you may have contributed to the blockage, it's still worth reporting it promptly. The longer a partial blockage is left, the worse and more expensive it becomes - and that's in nobody's interest.

Getting It Fixed Quickly in Andover Rental Properties

When a drain needs clearing, the method depends on what's causing the blockage and how serious it is. Our engineers work through a process of diagnosis before recommending a fix, rather than defaulting to the most expensive option.

Plunging and manual rodding is the starting point for localised blockages close to a sink outlet or toilet pan. It's quick, low cost, and a tenant can often attempt this themselves using equipment from a hardware shop. If it doesn't clear within a few attempts, stop - pushing a blockage further into the system can make it harder to clear professionally.

High-pressure water jetting is the standard professional response for blockages further into the drain runs. A powerful jet of water breaks up the obstruction and flushes it through the system. This typically costs between 100 and 250 pounds for a residential property, depending on how serious the blockage is and how accessible the drain is. For older drainage layouts, costs can sit towards the upper end of that range.

CCTV drain surveys are used where the cause isn't clear from manual inspection, or where blockages keep coming back. A camera is pushed through the drain on a flexible cable, giving engineers a real-time view of the pipe condition. In rental properties where there's a dispute over who is responsible, a CCTV survey is strongly advisable because it produces an objective record that both parties can refer to. Surveys typically cost between 150 and 350 pounds.

Pipe relining or excavation is required where the drain itself has failed - cracked, collapsed, or heavily root-infiltrated. Pipe relining without digging typically costs between 500 and 1,500 pounds for a short section; full excavation and replacement is considerably more, depending on depth and site access.

If you're using the Voltrade GoFIX diagnostic tool, you can log the symptoms, the location, and attach photos before the engineer arrives. That lets us identify the most likely cause before we're on site, which speeds up diagnosis and reduces the time the property is disrupted.

Blocked drains are a common but preventable problem, and catching a slow drain early is always cheaper than dealing with a complete blockage that has backed up into the property.

Documentation You Should Keep

Both landlords and tenants benefit from keeping a clear paper trail around drainage issues. If a dispute ends up before a deposit adjudicator or in the county court, documented evidence is what wins cases.

Landlords should keep:

• Pre-tenancy drain inspection reports, including any CCTV survey results carried out between tenancies
• Records of any drainage maintenance or repair work, with dates and contractor details
• Written communications with tenants about reported drainage issues and the response taken
• Invoices from drainage contractors, itemising the work done and the cause identified
• The inventory and check-in report, noting the condition of visible drains and external gullies at the start of each tenancy

Tenants should keep:

• Written records of every drainage problem reported, with the date and method of reporting
• Photos and videos taken when the problem was first noticed
• Any written responses from the landlord or letting agent
• Notes of verbal conversations, followed up immediately by email to create a written record
• Receipts if you arranged and paid for drain clearing yourself after the landlord failed to act within a reasonable timeframe

For landlords managing multiple properties across Andover and the surrounding area, a simple maintenance log recording when drainage issues were reported and how they were resolved is a useful habit. It demonstrates responsible property management and makes any tenancy dispute much easier to navigate - for both sides.

Landlord and Tenant Questions

Is a landlord legally required to fix a blocked drain in a rental property?

Yes, in most cases. Under Section 11 of the Landlord and Tenant Act 1985, landlords must maintain the structure and exterior of the property, which includes the drainage system. Where a blockage results from the condition of the pipes, tree root damage, or any structural cause, the landlord is responsible for the repair. The exception is where the blockage was clearly caused by the tenant's misuse of the drainage system, which the contractor's report should confirm.

What if the tenant caused the blockage - does the landlord still have to fix it first?

In practical terms, yes - particularly where the blockage is preventing the property from being used normally. A landlord cannot leave a property with sewage backing up while a liability dispute is resolved. The sensible approach is to arrange the repair promptly, document what the engineer finds, and then seek to recover costs from the tenant if misuse is confirmed. Do not withhold the repair as leverage - that can expose the landlord to a claim for breach of covenant.

How long does a landlord have to fix a blocked drain?

There is no single fixed legal timeframe, but courts and deposit adjudicators apply the test of "a reasonable time." For a blocked drain affecting the use of a kitchen or bathroom in an Andover rental property, that means arranging a repair within 24 to 72 hours of being notified. Failing to act promptly on a serious drainage issue can give tenants grounds to arrange repairs themselves and deduct the reasonable cost from rent, though tenants should take advice before doing so.

Can a tenant arrange their own drain repair and deduct it from rent?

In certain circumstances, yes. If a landlord fails to respond to a written report within a reasonable timeframe, and the blockage is clearly their responsibility, a tenant may be able to arrange and pay for the repair, then offset the cost against rent. This carries legal risk if handled incorrectly, so tenants should document the landlord's failure to act thoroughly before proceeding and consider seeking advice from a housing solicitor or Citizens Advice.

Who is responsible for a blocked drain in a shared house or HMO in Andover?

In a house in multiple occupation, the landlord is responsible for shared drainage infrastructure. If a blockage in a shared drain can be attributed to one tenant's misuse, the landlord may seek to recover costs from that tenant - but proving individual responsibility in a shared system is often difficult. Regular maintenance of shared drainage is a sensible precaution for any HMO landlord in Andover. It reduces the frequency of blockages and limits the disputes that tend to follow them.