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⚠ FLOODING EMERGENCY — Electrical hazards present. Do not wade through water near electrical outlets. Turn off power at the consumer unit first.

Emergency Guide

Home Flooding Emergency — Step-by-Step Action Guide

Flooding in your NW London home can come from several sources: burst pipes, blocked drains, sewage backup, or surface water from extreme rainfall. The period properties common in Hampstead, Belsize Park, and West Hampstead are particularly vulnerable due to original Victorian drainage systems. Whatever the cause, the priority is always safety first, then damage limitation.

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Available 24/7 — average 47-minute response

Step-by-Step Emergency Guide

  1. 1

    Eliminate electrical hazards first

    Before entering any flooded area, turn off the electricity supply at your consumer unit (fuse board). If water has reached the level of sockets, do not enter the room at all until a qualified electrician has confirmed it is safe. Water and electricity are a deadly combination.

    ⚠ If your consumer unit is in a flooded area, call an electrician immediately — do not attempt to access it yourself.

  2. 2

    Stop the source of flooding

    Identify the source. If it is a burst pipe, turn off the main stopcock immediately (usually under the kitchen sink). If it is a blocked drain or sewer backup, avoid flushing toilets or using any drains until the blockage is cleared. If it is surface water, you cannot stop it but can redirect it using sandbags.

  3. 3

    Call for emergency help

    Call our emergency plumbers on +44 20 8054 8756 for internal water sources. For sewer flooding, also contact Thames Water on 0800 316 9800. If the flooding is from an external source affecting multiple properties, call your local council's emergency line — Camden: 020 7974 4444, Westminster: 0800 358 3783.

  4. 4

    Protect your belongings

    Move valuables, documents, electronics, and furniture to upper floors or raised positions. Lay down old towels or sandbags at doorways to slow spread. Do not attempt to vacuum water with a standard vacuum cleaner — use a wet-and-dry vacuum only if there is no electrical hazard.

  5. 5

    Document everything for insurance

    Before any cleaning begins, photograph and video all damage from multiple angles. Include water levels marked on walls, damaged items, and affected areas. Contact your insurer immediately — most home policies cover sudden flooding from internal sources and some cover external flooding too.

  6. 6

    Ventilate and begin drying out

    Once flooding is controlled, open windows and doors to ventilate. Use fans (only when no electrical hazard exists) to improve airflow. Professional drying equipment may be needed for significant incidents — insurers often arrange this. Damp not properly dried within 24–48 hours can lead to mould.

Emergency Numbers

Emergency FAQs

Does home insurance cover flooding?▼
Most home insurance covers sudden, accidental flooding from internal sources (burst pipes, overflowing baths). External flooding (rivers, surface water) is covered by some policies but not all — check your documents. Building insurance covers structural damage; contents insurance covers possessions. Keep photographic evidence of all damage.
How long does it take to dry out a flooded room?▼
A mildly affected room with good ventilation can dry in 3–7 days. Significantly flooded rooms with soaked subfloors, plaster, or timber often require 2–6 weeks and professional drying equipment. Your insurer can arrange specialist drying firms. Do not redecorate until moisture readings confirm the structure is dry.
Is flooding from a blocked drain covered by Thames Water?▼
Thames Water is responsible for public sewers. If the blockage is within the public sewer, they will clear it free of charge. If the blockage is in your private drain (the section within your property boundary), you are responsible for clearing it. Our emergency drain unblocking service covers both scenarios.
How do I prevent flooding in my NW London property?▼
Key preventive measures include: annual drain jetting to clear roots and debris, checking and repairing gutter downpipes before winter, lagging pipes in loft spaces, fitting non-return valves to drains in flood-risk areas, and installing a water leak detector. Many NW London properties have Victorian drains that benefit from CCTV survey every few years.