Cleaning Up After a Flood: A UK Step-by-Step Recovery Guide

Cleaning up after a flood is one of the hardest parts of the whole ordeal. The water has gone, but it has left behind contaminated silt, ruined belongings and a building that is soaked through. Our work at Unda is mostly about stopping floods before they start, through flood risk assessment and drainage design, but flooding still happens, and when it does the recovery is dirty, slow and often distressing. This guide takes you through it in the right order: how to stay safe, what to record for your insurer, how to get the water out, what you can save and what has to go, how to dry the building out properly, and how to make sure you are never in this position again.

Work through it in sequence, and get cleaning and drying started within 24 to 48 hours where it is safe to do so, because that is the window in which mould is most likely to take hold.

Floodwater is not clean water. UK Health Security Agency guidance is blunt that it can carry human and livestock waste, sewage, and household, medical and industrial hazardous waste, along with sharp debris and spilled fuel or oil. So the order of these steps matters. Safety first, evidence second, then the physical clean-up, then drying, and only then repairs. If the damage is serious, professional flood restoration firms can do the heavy lifting, and your insurance may well pay for it.

Is floodwater dangerous? Stay safe first

Yes. Treat all floodwater and everything it has touched as contaminated, even once it looks clear. Before you re-enter, make sure the building is structurally sound and the electricity and gas are switched off at the mains; moving water shifts walls, lifts floors and hides sharp debris underfoot. Do not use any electrical appliance that has been wet until a qualified electrician has checked it.

Once you are inside and working, the single most protective thing you can do is also the simplest. UKHSA describes hand washing as the most important way to get rid of harmful bugs. Wash with warm clean water and soap whenever you take a break, before eating and before preparing food.

• Cover up. Wear rubber gloves, sturdy waterproof boots and a face mask, and a waterproof apron or overalls if you have them.
• Protect broken skin. Cover any cuts, grazes or sores with a waterproof plaster before you start, and keep them covered.
• Keep it out of your mouth and eyes. Do not eat, drink or smoke while cleaning, and wash your hands before you do any of those things.
• Wash work clothes separately. Keep the clothes you clean in away from the rest of the household wash.
• Mind the fumes. Never run a petrol or diesel generator, pump or pressure washer indoors: the exhaust contains carbon monoxide.

For the full health picture, the Government's own advice is the authority to read: see the UKHSA guidance on how to recover from flooding.

Document the damage before you start

Before you move, bin or clean anything, record it. Insurers can and do query claims where there is no evidence of what was damaged and how badly, so your photographs and notes are what turn a stressful clean-up into a paid claim. Spend twenty minutes on this and it pays for itself.

1. Photograph and video every affected room, including the depth the water reached; a tide mark on the wall is powerful evidence.
2. Photograph damaged contents individually where you can, and note makes, models and rough ages of appliances and furniture.
3. Phone your insurer's emergency line before you throw anything away, and ask what they need and whether they will send a loss adjuster.
4. Keep receipts for anything you spend during the emergency: pumps, dehumidifier hire, temporary accommodation, replacement essentials.
5. Only dispose of ruined, unhygienic items once you have logged them; if in doubt, photograph first and set them aside rather than binning them.

The rule of thumb: never throw a damaged item away until you have photographed it and checked with your insurer, because undocumented losses are the easiest for a claim to lose.

Getting the water and silt out

Once the outside water level has dropped below the level inside, you can start removing what is left. Pump out standing water where it is more than ankle-deep, then shovel and sweep out the silt while it is still wet, because it sets like concrete once it dries and is far harder to shift. A wet vacuum is useful for the last of it; dispose of the dirty water down a foul drain (a toilet or a soil-stack gully), not into a river, ditch or surface-water gully.

Speed really does matter here. The sooner the standing water and saturated silt are gone and air is moving through the building, the less damage the structure takes and the smaller the mould risk. Open windows and doors if the weather allows, and get fans and a dehumidifier going as soon as the power supply has been checked and declared safe.

What to throw away and what you can save

The hard truth of cleaning up after a flood is that porous, soft and food items that have been in contaminated water usually cannot be salvaged safely, while hard, non-porous and sealed items often can be cleaned and kept. When you are deciding, err toward disposal for anything that touches food, skin or bedding, and toward cleaning for solid, wipeable things. The table below is the quick version.

Wooden furniture is often worth saving: take it outside, clean the mud off with warm water and washing-up liquid, and let it dry slowly and evenly so it does not crack or warp. Wash all clothing and textiles you intend to keep, whether or not they were wet, and use a launderette if your own machine was affected. UKHSA advises a wash at 60°C or above for soft items.

Cleaning and disinfecting your home

Once the building is clear of water, silt and ruined contents, clean it from the top down and from the cleanest room to the dirtiest. Wash hard surfaces (walls, floors, skirtings, worktops) with hot water and a household detergent first to lift the dirt, then disinfect with a bleach solution or a proprietary disinfectant. Cleaning and disinfecting are two separate steps: detergent removes the grime, disinfectant kills what is left.

• Give bleach time to work. Leave it on the surface for the contact time on the manufacturer's instructions, then wipe the residue off.
• Detergent first, disinfectant second. Disinfectant does little on a dirty surface, so clean first, then kill.
• Hot-wash soft items. Curtains, cushion covers and bedding you are keeping want a wash at 60°C or above, or steam cleaning.
• Pressure-wash outdoors only. Hose down paths, walls and hard standing outside, and collect the run-off rather than flushing it to a watercourse.
• Ventilate as you go. Keep air moving so cleaning chemicals and moisture clear, and never mix bleach with other cleaning products.

How do you dry out a house after a flood (and stop mould)?

Drying out a flooded house is the longest phase and the one people underestimate. Getting the surfaces touch-dry takes days; getting the fabric of the building dry (plaster, brick, screed and timber) can take weeks, and solid masonry walls can take months. Rushing it is the single most common way to turn one flood into a second, hidden problem, because sealing damp into a wall invites rot and mould behind fresh plaster.

Heating, dehumidifiers and good ventilation are what dry a home out. Keep all three running, and keep going well past the point where the walls merely feel dry to the touch.

1. Ventilate: open windows and internal doors whenever the weather is dry to let moist air out.
2. Run dehumidifiers in closed rooms to pull moisture from the air, and empty them regularly.
3. Add gentle background heat. Steady warmth helps, but do not blast wet walls with a domestic heater without professional advice.
4. Lift floorboards and open up boxed-in voids where you safely can, so air reaches trapped damp.
5. Treat small patches of mould with a proprietary mould remover as they appear, and call a specialist if growth is extensive.

Most people will not have health problems from short-term contact with a little mould, but prolonged exposure to large amounts can irritate the airways and worsen asthma, so tackle it early and speak to your GP if anyone in the home is affected. The temptation to redecorate quickly is understandable, but a wall that is re-plastered or painted while still wet will simply hold the damp, so wait for it to dry to the core first.

Food, water and hygiene

Do not eat any food that has been in contact with floodwater, and that includes sealed tins and jars, which can be contaminated around the seams and lids. If the power has been off, judge the fridge and freezer by time and temperature.

• Fridge, four hours. If the power was off for more than four hours with the door closed, throw the fridge contents away.
• Freezer, keep it shut. A full freezer holds temperature longer; discard food that has warmed above 8°C, though meat and fish still cold can be cooked or refrozen.
• Wash before you cook. Clean all work surfaces, plates and pans, and bin wooden chopping boards and spoons that met floodwater.
• Check your water. If your supply tastes, smells or looks odd, or your water company issues a "boil" or "do not drink" notice, follow it and use bottled or boiled-and-cooled water.
• Take extra care with babies. Use bottled water (sodium under 200mg per litre) that has been boiled and cooled for infant formula if the tap supply is in doubt.

Insurance, loss adjusters and Build Back Better

For most households the clean-up runs in parallel with an insurance claim, so understanding how that works takes a lot of the pressure off. Contact your insurer's 24-hour claims line as early as you can. On a larger claim they will usually appoint a loss adjuster to assess the damage and manage the repair, and they can often arrange emergency drying, a surveyor and, where your home is uninhabitable, temporary alternative accommodation under your policy. Keep every receipt and every piece of correspondence.

There is one opportunity that is easy to miss in the chaos. When flood-damaged parts of your home are being repaired, that is the cheapest moment you will ever get to make it more resilient to the next flood, and a scheme called Build Back Better exists to help pay for exactly that.

Through Flood Re's Build Back Better scheme, participating insurers can pay up to £10,000 over and above the cost of repairs to fit flood-resilience measures as your home is put back together.

That £10,000 can go toward things like flood doors and barriers, raised electrics and appliances, and hard flooring in place of carpet. Those measures mean the next flood costs less and displaces you for less time. Not every insurer offers it, so ask specifically whether your policy includes Build Back Better. The details are set out on Flood Re's Build Back Better page, and our guide to what Flood Re is and how it works explains the wider scheme behind it.

Renting? What your landlord should do

If you rent, the responsibility for the building itself sits with your landlord, not you. Report the flooding to them or the letting agent immediately and in writing, keep a copy, and let them deal with the buildings insurance claim, the structural drying and the repairs. Your own contents (furniture, clothing and electricals) are yours to claim on your contents insurance if you have it, so photograph and log them exactly as an owner-occupier would.

Where a rented home cannot be lived in, talk to your landlord about alternative accommodation and about a fair position on rent while you cannot live there. If you cannot reach agreement, your local council's housing team and Citizens Advice can help you understand your rights.

Look after yourself: the toll a flood takes

The clean-up is physical, but the hardest part is often emotional, and it is important to name that. Being flooded is a real shock. The loss of irreplaceable things, the upheaval, the months of disruption and the fear of it happening again all weigh heavily, and the effect can last long after the house is dry.

The scale of it is well evidenced. UKHSA points to research finding that people who had floodwater in their homes were up to six times more likely to report probable PTSD, depression or anxiety than those who were not flooded. Its advice is that distress in the weeks after a flood is normal, but that you should seek professional support if it lasts more than two weeks without easing. Lean on friends and family, talk to your GP or NHS 111, and use the specialist support that exists.

The National Flood Forum, an independent charity, runs a support line on 01299 403055 and helps people through both the practical recovery and the stress of it. You do not have to manage the recovery, the insurer and your own wellbeing entirely alone.

Stop it happening again: property flood resilience

Once the worst is over, the recovery is also the best possible moment to reduce the damage the next flood does, because the building is already open and the works are already under way. Property flood resilience splits into two ideas: keeping water out, and limiting the harm when it gets in anyway.

• Resistance: keep water out. Flood doors and barriers, airbrick covers, non-return valves on drains and sealed low-level walls buy time and keep shallow floods at bay.
• Resilience: limit the damage. Hard flooring, raised electrical sockets, moveable or water-resistant kitchen units and lime-based plaster mean a flood that does get in dries out faster and costs far less to put right.
• Know your risk. Understand which sources threaten you, whether river, surface water, groundwater or sewer, before you spend, so the measures match the threat.
• Keep drains clear. Simple, regular maintenance of gullies and drains reduces the surface-water flooding that now affects more English homes than any other source.

It is worth knowing your starting point: you can check a property's long-term flood risk on our flood risk map and postcode checker, read our companion guide on how to prepare for a flood and protect your home, and see practical steps in our articles on property flood resilience and maintaining your drains to prevent surface-water flooding. Because surface water is now the largest single source of flood risk in England, small measures around the outside of a home are rarely wasted.

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