24/7 emergency & reactive maintenance · London
Emergency drain unblocking in London
Toilet overflowing, wastewater backing up or several drains blocked?
Homes, businesses, landlords and managing agents. One number for the fault, the visit and the next repair step.
1-hour arrival aim, subject to availability. Give us your postcode and fault for the available visit time and charge. Call for an active emergency; the form does not dispatch help.
A blockage affecting several fixtures or sending wastewater back into a building needs prompt attention. Explain what is overflowing, whether there is another usable toilet and whether neighbouring properties are affected. We arrange drainage investigation and suitable clearance for private drainage.
When to call
Problems we can help with
- Overflowing or blocked toilets, especially the only toilet
- Wastewater returning through sinks, baths or showers
- Private external drains backing up
- Recurring blockages after a previous clearance
Safety first
While you arrange help
Stop using affected fittings and keep people and pets away from sewage. Do not mix drain chemicals or enter inspection chambers. Report public sewer flooding to the water company; Thames Water can be contacted on 0800 316 9800.
What the visit can include
- Assess the affected fixtures and accessible drainage route.
- Use suitable clearance methods for the obstruction and pipe condition.
- Check flow and advise whether recurring faults need a camera survey or repair.
A collapsed pipe, roots, inaccessible chambers or a public sewer fault may require a different repair route. Clearance is not a guarantee against recurrence when the underlying defect remains.
Detailed drainage repair guides & local areasTell us these details when you call
- Which fittings are blocked and when did the backup start?
- Is sewage entering the building or affecting neighbours?
- Has anyone used drain chemicals or recently cleared the same drain?
Add the full postcode, a safe contact number and who can arrange entry. Send photos only if you can take them safely.
Know the next step
Your emergency visit and price
Call for the charge for your fault and attendance time, including VAT and what the visit covers. Our small-repair offer starts from £85 including VAT for eligible accessible jobs; it is not a fixed price for every emergency. Parts, specialist equipment and further work are priced separately and need your approval.
We explain the expected arrival and charge when arranging your visit. If the problem needs a temporary make-safe measure first, we explain the permanent repair separately.
From the call to the repair
- Tell us the fault, postcode and any immediate risks.
- Agree the available attendance, access and price.
- The appropriate trade investigates and carries out suitable work, with extra work approved by you.
All 32 boroughs & the City of London
Emergency repair coverage across London
Call with your full postcode, whether you are in Mayfair, Marylebone, Kensington, Fulham, Camden, Islington, Stratford, Greenwich, Croydon or another London neighbourhood. The groups below help you find the existing local repair guides; postcode districts can cross borough boundaries and some postal areas extend beyond London.
Central London
Postcode areas include W1, WC1, WC2, EC1, EC2, EC3, EC4, SW1. Give the full address for attendance.
City of Westminster drainage guide City of London drainage guide Camden drainage guide Kensington and Chelsea drainage guideNorth London
Postcode areas include N, EN. Give the full address for attendance.
Barnet drainage guide Enfield drainage guide Haringey drainage guide Islington drainage guide Camden drainage guideNorth West London
Postcode areas include NW, HA. Give the full address for attendance.
Brent drainage guide Harrow drainage guide Barnet drainage guide Camden drainage guideWest London
Postcode areas include W, UB, TW. Give the full address for attendance.
Kensington and Chelsea drainage guide Hammersmith & Fulham drainage guide Ealing drainage guide Hounslow drainage guide Hillingdon drainage guideEast London
Postcode areas include E, IG, RM. Give the full address for attendance.
Hackney drainage guide Tower Hamlets drainage guide Newham drainage guide Waltham Forest drainage guide Redbridge drainage guide Barking and Dagenham drainage guide Havering drainage guideSouth East London
Postcode areas include SE, BR, DA. Give the full address for attendance.
Southwark drainage guide Lewisham drainage guide Greenwich drainage guide Bexley drainage guide Bromley drainage guideSouth West London
Postcode areas include SW, KT, SM, CR, TW. Give the full address for attendance.
Wandsworth drainage guide Lambeth drainage guide Merton drainage guide Richmond upon Thames drainage guide Kingston upon Thames drainage guide Sutton drainage guide Croydon drainage guideFor a managed building, tell us who can provide access to shared supplies, plant rooms or neighbouring premises. A shared-system fault may need the building manager involved.
Reactive repairs for commercial properties
Report the affected equipment or area, impact on trading, access hours and the person authorised to approve work. We help offices, shops, hospitality premises and managed buildings arrange maintenance around their operational needs.
Commercial maintenance solutionsEmergency repair questions
Can I call Mayfair 24 hours a day?
Yes. Contact Mayfair 24/7 for emergency and reactive maintenance across London, including evenings, weekends and bank holidays. Describe the fault and give your full postcode so attendance can be arranged.
How quickly can someone arrive?
We aim for arrival within 1 hour where available. Timing depends on your postcode, the specialist required, current availability and travel conditions. Safe access and weather also affect roofing and other external work. We explain the expected attendance when you call.
How much does an emergency repair cost?
Call for the charge for your fault and attendance time, including VAT and what the visit covers. Our small-repair offer starts from £85 including VAT for eligible accessible jobs; it is not a fixed price for every emergency. Parts, specialist equipment and further work are priced separately and need your approval.
Will you need a CCTV drain survey?
Not every simple blockage needs one. Repeated blockages, suspected damage or uncertainty about the route can justify a camera survey after access and flow conditions are assessed.
Can I send an emergency through the form?
Call for an active emergency. The form is useful for supporting details or a non-immediate repair, but it does not dispatch an engineer or book attendance.
Speak directly to Mayfair
Request your service quote.
Tell us what’s happening and where. We’ll help you work out the next step and what it costs.
No account needed. No payment to send an enquiry.
For an active emergency, call our 24/7 line on 020 4571 4235. This form does not dispatch an engineer. For immediate danger to people, call 999.
How your repair quote worksOther emergency repair services
Emergency plumbingBurst pipe, water pouring through a ceiling or a leak you cannot stop?24/7 contact · Scope & safety advice 
Emergency electrical repairsPower gone, circuits repeatedly tripping or a damaged electrical fitting?24/7 contact · Scope & safety advice 
Boiler & heating breakdownsNo heating or hot water, a leaking boiler or pressure that keeps dropping?24/7 contact · Scope & safety advice 
Roof leaks & storm damageRain coming in, damaged roof covering or a gutter overflowing into the building?24/7 contact · Scope & safety advice 
Doors, windows & make-safeDamaged door or window leaving your property exposed or unable to close?24/7 contact · Scope & safety advice Official safety and utility guidance
Cadent: gas emergencies · 105: power cuts · Thames Water: sewer flooding. Guidance reviewed 12 September 2026.