It depends on what became wet

Solid masonry, plasterboard, insulation, suspended timber floors and concrete all behave differently. A shallow brief flood can affect a house differently from water that remains for days.

Why the surface can mislead

A wall may feel dry while moisture remains deeper within it. Covering damp materials with new finishes can trap moisture and delay recovery.

Controlled drying

Ventilation, heating and dehumidification may form part of a planned programme once the building is safe and contamination has been dealt with. Professional monitoring helps avoid guesswork.

What about plaster?

Some finishes can be retained after appropriate assessment; others may have to be removed due to contamination, damage or trapped water. Decisions should be based on condition, not a fixed height on every wall.

Do not redecorate early

Before reinstatement, ask for appropriate moisture assessment of the affected construction. A single electrical moisture meter reading cannot establish the condition of every material.

Insurance and records

Keep drying logs and records of work where possible. If your insurer is managing the claim, agree the drying and reinstatement specification before appointing separate contractors.

Why drying times vary so much

A solid brick wall, timber floor, plasterboard lining and insulated cavity will not all dry at the same speed. Flood depth and duration matter, as do water contamination, the weather and what has been trapped behind cabinets and skirtings. A heated room can feel comfortable while concealed materials remain wet. That is why promises that every flooded house will dry in a fixed number of days should be treated cautiously.

Ask for an actual drying record

Professional drying often involves controlled ventilation, dehumidification and regular checks, but equipment must be used safely and matched to the building. Ask which areas have been measured, where access openings were needed and how the contractor decided that rebuilding could begin. Do not cover damp walls with impermeable finishes or refit a kitchen over wet construction. Where historic solid walls are involved, recovery choices should reflect their moisture behaviour rather than importing details intended for modern cavity walls.

Hidden moisture changes the timetable

Water rarely stays only on the visible floor surface. It can pass under fitted units, enter the base of plasterboard partitions and collect beneath suspended timber floors. It may travel through insulation or remain behind skirting boards after the room feels comfortable again. This is why the length of the drying period cannot sensibly be predicted from the depth of water alone. Construction type, temperature, ventilation, contamination and how quickly the water was removed all play a part.

Professional drying may involve targeted opening-up, dehumidifiers, air movement and repeated measurements in the same locations. The aim is controlled progress, not simply heating the building as much as possible. Some materials will need removal because they are contaminated or cannot be reliably dried in place. Others can be kept if their condition is sound and they dry appropriately.

How to tell whether the work is complete

Ask for a drying record that identifies which parts of the building were checked, what instruments were used and what criteria supported the decision to stop. A single surface reading, particularly without context, is not proof that all hidden voids are dry. When a timber floor or cavity wall was affected, consider whether access was sufficient to check the vulnerable areas. If a musty smell develops after the equipment is removed, it deserves investigation rather than simply covering it with paint.

Before refitting a kitchen, laying new flooring or replastering, check that the responsible contractor or insurer has signed off the relevant stage. Keep copies of readings and photographs. If the original route of entry has not been dealt with, discuss that separately; drying the house successfully once does nothing to stop another flood arriving by the same route.

Avoid sealing wet construction too early

Finishing materials are often ordered while drying is still taking place. That is sensible for planning, but installation should wait for evidence that the affected areas are ready. Plaster, adhesives and flooring products have their own substrate requirements. Covering damp construction can cause lifting, staining or mould and make it harder to identify where moisture remains. Ask the contractor who will check the surfaces immediately before the finish is applied, and record that decision alongside the other drying evidence.

Reliable further information

For current warnings, official flood-risk maps and safety advice, use the relevant government service. This website cannot assess live conditions at your home.

Government flood guidance · National Flood Forum · Citizens Advice