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Flood Restoration

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Flood restoration is the long version of water damage work. A flood puts contaminated water through the structure rather than down through one ceiling, it usually arrives with silt and debris, and it wets materials that were never designed to get wet at all — chipboard flooring, plasterboard, mineral wool in a stud, chipboard kitchen carcasses, the insulation under a screed. The drying alone can run for months, and the decisions made in the first fortnight determine how long that is.

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It is also the one restoration job where the rebuild is an opportunity. Putting a flooded house back exactly as it was recreates a property that will be damaged in exactly the same way next time. The British answer to that is property flood resilience: reinstating with materials and details chosen so that water either does not get in, or does less damage and dries faster when it does.

Two documents carry that thinking. BS 85500:2025, Flood resilient construction, improving the flood performance of buildings, guide, published on 27 March 2025, replaced the 2015 edition and covers new buildings, extensions, conversions and retrofits. Alongside it, CIRIA's code of practice for property flood resilience, C790, sets out six standards covering hazard assessment, property survey, options development and design, construction, commissioning and handover, and operation and maintenance. Between them they describe what a good flood reinstatement should look like.

Floodwater is not clean water, and the house is not safe by default

  • Check with the emergency services that it is safe to return before you go back into a flooded property.
  • Do not turn the water, gas or electricity back on: get the utility company or a qualified engineer to confirm they are safe before anything is re-energised.
  • Any water from outside the property is treated as contaminated, so avoid direct skin contact, wash hands thoroughly before touching food and cover any cuts with a waterproof plaster.
  • Wear gloves and suitable protective clothing when handling flood-affected materials, and keep children and pets out of the working area.
  • Contact the environmental health department at the local council to dispose of anything polluted by chemicals or sewage, rather than putting it in the household bin.
  • Take photographs of the damage and of the flood water line before moving or discarding anything, and check with the insurer about what can be thrown away.
  • Expect mould to start once the building has been wet, so getting drying under way is a safety measure as well as a repair one.

The sequence after a flood, and why it is slow

First the water comes out and the silt goes with it, because silt holds moisture and contamination against every surface it is left on. Then comes the strip-out: floor coverings, saturated plaster up to an agreed height, wet insulation, kitchen units whose carcasses have swelled, and often the lower part of stud partitions. This stage feels destructive and is the one homeowners find hardest, but leaving wet material in the building is what turns a six-month reinstatement into a two-year one.

Cleaning and decontamination follow, and only then does drying begin in earnest. A flooded masonry wall, a screed and the ground beneath a suspended floor all hold very large amounts of water, and they release it slowly. Drying is managed with dehumidification and air movement and measured against targets; the honest answer to how long it takes is that the readings decide, not the calendar.

Reinstatement is last and is where the resilience decisions get made. This is the moment to raise sockets, choose a floor finish that survives wetting, use a plaster or board specification that can be dried rather than replaced, and fit non-return valves or covers on the routes water used last time. Doing that during a reinstatement that is happening anyway is a completely different proposition from retrofitting it later.

Resistance and recoverability are two different aims

  • Resistance measures try to keep water out: flood doors, barriers across openings, airbrick covers, sealed service entries and non-return valves on drainage.
  • Recoverability measures accept that water may enter and limit what it ruins: raised sockets and services, resilient floor finishes, replaceable skirtings and wall build-ups that can be dried.
  • Resistance has a limit. Holding water out against a significant depth can put pressure on a wall or floor that was never designed to resist it, which is why a hazard assessment comes before a product choice.
  • Recoverability is what shortens the time out of the house, which for most households is the cost that actually hurts.
  • The CIRIA code of practice C790 sequences both the same way: hazard assessment, then property survey, then options development and design, then construction, then commissioning and handover, then operation and maintenance.
  • Most real schemes are a mixture, with resistance used up to a depth the building can take and recoverability carrying everything above it.

BS 85500:2025 and the property flood resilience code of practice

BS 85500:2025, Flood resilient construction, improving the flood performance of buildings, guide, was published on 27 March 2025 and superseded BS 85500:2015. Its subject is improving the resilience of buildings through resistance and recoverability, reducing the impacts of flooding from all sources using suitable materials and construction details, and it explicitly covers retrofit as well as new build, extensions and conversions.

It is worth knowing what it deliberately leaves out, because that shapes who you need on the job. The standard excludes detailed structural engineering design, site layout, temporary flood protection products, the design of watertight concrete, amphibious and floating properties, structures on stilts, and measures that avoid flooding externally rather than at the building. Anything in that list is somebody else's specialism.

CIRIA's C790 covers the delivery side. It is aimed at property owners, managers, engineers and flood risk professionals, sets out six standards for delivering property flood resilience, and is published with supporting guidance, including a free fact sheet for households and businesses and separate guidance for local authority planners. If you are commissioning resilience work, asking a contractor how their proposal maps onto those six stages is a fair and revealing question.

Reinstating so that the next flood costs less

  • Floor finishes that tolerate wetting and can be lifted and re-laid, rather than fitted carpet over chipboard that swells and is never the same again.
  • Wall build-ups chosen so the lower metre can be dried or replaced on its own, instead of a construction that has to be stripped from floor to ceiling.
  • Services raised: sockets, consumer unit, boiler and controls lifted above the likely water line where the layout and regulations allow.
  • Kitchen and utility carcasses in a material that survives immersion, with plinths that come off rather than having to be cut out.
  • Non-return valves on foul drainage and covers on airbricks, so the routes water used last time are closed the next time.
  • Doors and thresholds specified for flood performance where the assessment supports it, rather than as a default purchase.
  • Insulation that does not act as a sponge in the vulnerable zone, chosen with an eye to drying rather than only to thermal performance.

Where flood reinstatement goes wrong

The commonest failure is finishing to a date rather than to a moisture reading. Everyone involved wants the household home, and plaster and flooring are the visible signs of that, so they go on while the structure behind them is still holding water. The consequence surfaces a winter later as blistered paint, blackened skirtings and a smell that will not lift, and by then it is a dispute about whether the second loss was caused by the first.

The second is reinstating like for like without anybody raising resilience. If nothing in the specification changed, the property has been restored to precisely the condition in which it flooded, and the next event will produce the same bill. A reinstatement is the cheapest possible moment to build in recoverability, because the walls and floors are already open.

The third is buying products before assessing the hazard. Barriers, doors and airbrick covers are sold as solutions, but the depth, duration and source of flooding at your property determine whether resistance is appropriate at all — and holding water out above a certain depth can put loads on the structure that the building was never designed for. C790 puts hazard assessment and property survey first for that reason.

What drives a flood restoration quote, and how LokalMatch fits in

Depth and duration drive everything downstream. The variables are how high the water reached and how long it stood, whether the floor is suspended timber or a screed over insulation, how much silt and contamination came in with it, how much of the building has to be stripped back before drying can start, how many weeks of dehumidification the readings demand, whether the household can stay in part of the property, and whether the reinstatement is like for like or includes resilience measures. Two houses in the same street can differ by months because one has a solid floor and one does not.

LokalMatch is only the connection point. Describe the property, the depth and source of the flooding and where you have got to, add your postcode, and flood restoration firms working in your area reply to you. It is free for homeowners, and the pros pay for the requests they receive. LokalMatch does not carry out restoration, does not set prices and does not vet, rank or recommend anyone, so ask each firm how they will evidence drying and whether their reinstatement proposal addresses resilience or only replacement.

Flood Restoration: frequently asked questions

How long does a flooded house take to dry?

Longer than almost anyone expects, and the readings decide rather than the calendar. Masonry walls, screeds and the ground beneath a suspended floor hold very large volumes of water and release it slowly, so drying is managed with dehumidification and air movement and measured against agreed targets. Ask for the moisture readings at intervals; that record, rather than a promised date, is what tells you when the finishing trades can start.

Can I get flood cover if my home has flooded before?

Flood Re is the reinsurance scheme that sits behind household flood cover in Britain, and eligibility is by criteria rather than by claims history. The trap is the build date: it only covers homes built and given a council tax band before 2009, so a property completed on or after 1 January 2009 is outside it. Business premises and homes let to people other than immediate family are excluded, and while some blocks of up to three flats may qualify, larger developments generally do not.

Is there a current British Standard on flood resilient building work?

Yes. BS 85500:2025, Flood resilient construction, improving the flood performance of buildings, guide, was published on 27 March 2025 and replaced the 2015 edition. It covers improving resilience through resistance and recoverability against flooding from all sources, for new buildings, extensions, conversions and retrofits. It deliberately excludes detailed structural engineering, watertight concrete design, temporary flood products and external avoidance measures.

Should I fit flood barriers and doors?

Possibly, but only after an assessment rather than before one. Resistance measures keep water out up to a point, and above that depth the pressure on walls and floors becomes a structural question in its own right. CIRIA's code of practice for property flood resilience, C790, deliberately puts hazard assessment and property survey ahead of options development and design, which is the right order for a homeowner too.

Can I clean up the flood myself?

Some of it, with care, but treat floodwater as contaminated because water from outside the property always is. Wear gloves and protective clothing, wash hands thoroughly before touching food, cover cuts with a waterproof plaster, and contact the council's environmental health department about disposing of anything polluted by chemicals or sewage. Do not turn utilities back on yourself; have them checked by the supply company or a qualified engineer.

Will my insurer pay for resilient reinstatement rather than like for like?

It depends on the policy and the insurer, and it is a conversation to have early rather than after the specification is fixed. Some household policies participate in arrangements that allow resilience measures to be installed during flood repairs; others settle on a like-for-like basis and treat any improvement as a homeowner contribution. Either way, the open-walls stage of a reinstatement is the cheapest moment to do it.

Sources

  1. BSI: BS 85500:2025, Flood resilient construction, improving the flood performance of buildings, guide
  2. CIRIA: code of practice for property flood resilience (C790)
  3. GOV.UK: what to do after a flood
  4. Flood Re: can Flood Re help me (eligibility criteria)
  5. South Wales Fire and Rescue Service: After the Fire (contaminated water precautions)

Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides

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What affects the cost of flood restoration

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Interior or exterior approach
  • Length of foundation wall to excavate or treat
  • Depth, soil conditions and access for equipment
  • Crack repair, underpinning or other structural work
  • Weeping tile, sump pumps and backwater valves
  • Restoring landscaping, driveways or finished basements
  • Testing and safe removal of mould or asbestos, where needed

How to compare restoration companies before you hire

  • Choose a contractor who finds the source of the water before recommending a fix, whether that's grading, eavestroughs, cracks or drainage.
  • Ask them to explain the difference between interior and exterior waterproofing for your home, and why they recommend one.
  • For foundation cracks that are wide, growing or uneven, ask whether a structural engineer should assess them first.
  • For mould, asbestos or radon, hire professionals qualified for that specific work, and don't disturb suspect materials yourself.
  • Get a written quote that lists excavation, membranes, weeping tile, sump pumps and restoration of landscaping or finishes.

Questions to ask restoration companies before you hire

  • Where do you think the water is coming from, and how did you confirm it?
  • Do you recommend interior or exterior waterproofing for my home, and why?
  • Should a structural engineer look at these cracks or this wall?
  • Does this work need a permit from my municipality?
  • Is your warranty transferable if I sell the house, and what does it cover?
  • How will you restore the landscaping, driveway or basement finishes afterwards?
  • If you find mould or asbestos, how will it be handled and by whom?

When to call a pro for flood restoration

  • Water on the basement floor or damp walls after rain or snowmelt
  • Foundation cracks that are growing, or walls that bow or lean, which should be assessed by a qualified professional
  • Musty smells or mould that keeps coming back
  • Suspected asbestos in insulation, flooring or pipe wrap: leave it undisturbed and call a qualified abatement professional.

Flood restoration permits and local rules

Some flood restoration work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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