Commercial Drainage Farnborough | Landlord & Business Guide

Your kitchen porter calls at 7 a.m. on a Saturday. The floor drain is backing up, the prep area smells, and you've got a lunchtime service booked. Or your letting agent rings because a tenant in your Cove Road HMO has no working toilets and the manhole outside is overflowing. Either way, the day has taken a sharp turn.

Most of those calls are avoidable. Not all of them, but most. What usually causes them isn't bad luck, it's the absence of a plan. Commercial drainage and rental property drainage are not the same animal as a domestic blocked sink. The volumes are bigger, the legal obligations are real, and the cost of getting it wrong lands somewhere between 'expensive' and 'trading standards letter'.

So here's what you actually need to know if you run a business or own rental property in Farnborough and the surrounding GU postcodes.

Grease Traps: What They Are and Why Farnborough Kitchens Need Them

If you run any kind of food operation, a café in Farnborough town centre, a takeaway on Queensmead, a pub kitchen in North Camp, a sandwich unit on the Southwood business park, you are almost certainly producing fats, oils and grease (FOG) every single service. That FOG goes down the drain warm and liquid. It cools, it solidifies, it sticks to the pipe walls, and it builds up layer by layer until the pipe is blocked.

The water company can, and does, issue fixed penalty notices and cost-recovery orders for FOG blockages in the public sewer that trace back to a commercial premises. 'I didn't know' is not a defence.

A grease trap, also called a grease interceptor, sits between your kitchen drainage and the main sewer. Warm water slows down as it passes through the trap, fats float to the surface and are retained, and the cleaner water passes through. Simple in principle. The catch is maintenance.

The three things that kill grease traps

• Infrequent emptying. Once a trap is full it stops intercepting. The FOG bypasses it completely and goes straight into the drain. Depending on the volume of your kitchen, emptying frequency varies from weekly for a busy restaurant to monthly for a small café, but your engineer can advise after a survey.
• Hot water and chemicals. Staff pouring boiling water or degreasers down the drain melts the FOG temporarily, gets it past the trap, and it re-solidifies further down the pipe where you can't reach it easily.
• Wrong size for the kitchen. A trap specified for a ten-cover lunch spot won't cope with a fifty-cover evening restaurant. If your grease trap was installed by a previous tenant and you've never had it checked, get it surveyed. It may be undersized.

High-pressure water jetting clears the downstream pipe when FOG has already built up. A CCTV drain survey then shows you exactly where the worst accumulation is sitting and whether the pipe wall has been damaged. That combination, a jet and a camera, is the starting point for any commercial kitchen drainage we haven't looked at before.

Planned Maintenance Contracts: The Business Case

Here's the honest argument. A reactive call-out at 7 a.m. on a Saturday costs more than a scheduled visit on a Tuesday morning. It always will. Beyond the engineer's time, there's your lost trading time, your staff standing around, potentially a food hygiene inspection triggered by the incident. A single bad Saturday can wipe out months of what a maintenance contract would have cost.

Planned drainage maintenance for a commercial premises in the GU14 area typically covers:

• Scheduled high-pressure jetting of kitchen drains and grease trap outlet pipes
• Grease trap inspection and coordination of emptying (we can advise on licensed waste carriers for the FOG itself)
• Gully and manhole clearance in car parks, loading bays and external yards
• CCTV surveys at agreed intervals so you can see the condition of your underground pipes before they fail
• Root cutting if your site has mature trees. The business parks around Southwood and Farnborough Park have some significant tree coverage, and roots are a slow, patient enemy of clay drainage pipes
• Descaling of pipework where limescale or grease has narrowed the bore

When you're looking at a maintenance contract, push the contractor on what the intervals actually are, what's included versus what triggers an extra charge, and whether they hold records of every visit so you have a paper trail if a water company ever questions your FOG management.

For food businesses, that paper trail is genuinely valuable. It shows due diligence.

Landlord Obligations: What the Law Actually Says

This is where a lot of Farnborough landlords get caught out, particularly those with older terraced housing in South Farnborough or Farnborough Street, HMOs in the streets around North Camp, or commercial lets on smaller industrial units in the Rafborough area.

The short version: you are responsible for the drains within your property boundary, and in most cases that includes the drains that serve your property up to the point they connect to the public sewer. Thames Water and South East Water won't touch private drains. That's your liability.

Residential landlords

Under the Landlord and Tenant Act 1985 and the Homes (Fitness for Human Habitation) Act 2018, you must keep drains and sanitation in proper working order. A blocked drain that makes a property unfit for habitation is a breach. If a tenant reports it and you ignore it, they can apply to the courts. The local authority can also issue improvement notices.

Practical consequences:

• A recurring blockage reported by a tenant is not a tenant problem. It's yours to investigate. If they're flushing wet wipes, that's a conversation to have with them. But if CCTV shows a collapsed pipe, root ingress or a belly in the line, you're paying to fix it.
• Houses in multiple occupation (HMOs) carry additional weight here. The HMO licensing conditions in Rushmoor Borough Council's area include requirements for drainage to be adequate for the number of occupants. An undersized or deteriorating system in a four or five-person HMO is a licensing risk.
• Section 11 of the Landlord and Tenant Act covers 'drains, gutters and external pipes'. If a drain blockage causes water ingress or damage to the structure, you're into disrepair territory quickly.

Commercial landlords and lease interpretation

Commercial leases vary enormously and the drainage obligations depend on what the lease actually says, so this is general guidance rather than legal advice. That said, some patterns are consistent.

Full repairing and insuring (FRI) leases put most maintenance obligations on the tenant, including drains. But 'most' is not 'all'. In a multi-let building, shared drainage runs, inspection chambers and manholes that serve more than one unit are usually the landlord's responsibility. A shared kitchen extract drain in a food-let building is a common flashpoint.

If you're renting to a food business, specify in the lease what FOG management the tenant must carry out, and make a grease trap maintenance schedule part of the lease conditions. Without that, you're relying on the tenant doing the right thing, and when they don't, the damage is in your foul drainage system.

Get a CCTV survey done at the start and end of a tenancy. It's your baseline evidence. If a tenant has caused FOG damage to the pipework and you can show pre-tenancy pipe condition versus post-tenancy pipe condition, you have a dilapidations case. Without it, you're arguing.

CCTV Drain Surveys for Farnborough Commercial Properties

A CCTV survey is a camera pushed through your drainage system on a flexible rod, recording footage of the internal pipe condition. It sounds straightforward and in execution it is, but what you get out of it is significant.

The survey identifies:

• Cracks, fractures and joint displacements (common in older clay pipe systems on Edwardian and pre-war commercial streets in Farnborough town and Aldershot)
• Root intrusion. Tree roots follow moisture and find their way into cracked joints. Once inside, they grow.
• Displaced pipes and bellies. A belly is a low point in the pipe where wastewater pools rather than flowing away. Grease and solids accumulate there first.
• Collapsed sections
• Incorrect connections, sometimes a surface water drain has been connected into a foul drain, which is an Environment Agency issue
• The condition of inspection chambers and manholes

For a landlord doing a periodic check, a CCTV survey of the main drain runs every three to five years is reasonable. For a food business with heavy drainage demand, annually makes sense alongside the jetting programme. For a property you've just acquired, before completion if possible, or as soon as you take ownership.

The survey produces a report and footage you can keep on file. If you're carrying out drain repairs or relining, the CCTV is the diagnostic step that tells the engineer exactly where to work.

Drain Repairs and Relining: No-Dig Options

If a survey finds a cracked or fractured pipe under a car park, a commercial kitchen floor or a landscaped area, the old answer was excavation. Dig it up, replace the section, reinstate the surface. Expensive, disruptive, and in a trading premises, potentially trading-stopping.

Drain relining avoids most of that. A resin-impregnated liner is inserted into the damaged pipe, positioned and then cured in place, creating a new pipe within the old one. No digging, the surface stays intact, and the repair is structurally sound. The work carries a 20-year guarantee on remedial work of that type.

It's not suitable for every situation. A completely collapsed pipe needs excavation. But for cracked joints, fractures and moderate root damage, relining is usually the faster, cheaper and less disruptive choice for a working commercial property.

Gullies, Manholes and External Drainage

The drains inside the building get attention when they block. The ones outside tend to get ignored until they're a problem.

Car park gullies on business park sites around Farnborough airport, Solartron Road, the Invincible Road area, they fill with leaf debris, grit, oil contamination and general sediment. A blocked car park gully in a heavy rainfall event backs surface water up onto the car park and potentially into the building. It's also a slip hazard and a Health and Safety Executive concern if staff or customers are walking through standing water.

Manhole covers on commercial sites need periodic inspection too. A cover that's deteriorated or a chamber with debris accumulation can become a confined space issue or a structural problem if a vehicle drives over a compromised cover.

Gully clearance and manhole clearance are routine parts of a maintenance schedule. On their own they're quick work. Left indefinitely, they become expensive problems.

What to Do Right Now if You've Never Had Your Drains Looked At

If you're a Farnborough landlord or business owner who's been operating on the 'if it ain't broke' principle, here's a sensible starting point.

For a food business: 1. Find out if you have a grease trap, where it is, and when it was last emptied and inspected. 2. Ask your kitchen staff what goes down the drain. Hot grease, boiling water poured down after service, chemical degreasers. All of those are problems. 3. Book a CCTV survey of the kitchen drain runs. You'll find out the current state of the pipe and whether you have FOG buildup downstream. 4. Use that survey to set a jetting and inspection schedule that makes sense for your volumes.

For a residential landlord: 1. Pull out your tenancy agreements and check how drainage maintenance is referred to. 2. If you haven't had a CCTV survey of the main drain, particularly for older properties in South Farnborough, Farnborough Street or North Camp, book one. Clay pipe in those streets is old and the joint condition can be poor. 3. If tenants have reported slow drains, recurring blockages or smells, take it seriously now rather than after a council notice. 4. For HMOs, check your licence conditions and make sure your drainage can realistically cope with the number of occupants.

For a commercial landlord: 1. Re-read the drainage clauses in your leases. 2. If you let to food tenants, make sure their FOG obligations are written in and being followed. 3. Get a baseline CCTV survey if you don't have one. 4. Check the external gullies and manhole covers on the site. Have someone walk them.

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Drainsco covers Farnborough and the full range of GU postcodes, with engineers available 24 hours a day, seven days a week. We handle emergency call-outs and planned commercial contracts. You'll get a clear price before any work starts and there's no call-out fee. If you want to talk through what a maintenance agreement or a one-off survey would look like for your site, give us a call.