Sewage backups and biohazard incidents are a different problem from ordinary water damage. Raw sewage carries bacteria, viruses and parasites, so the job isn't just about drying carpets, it's about removing contaminated materials, disinfecting surfaces, and confirming the space is safe to live or work in again. The same applies to other biohazard situations: flooding that's picked up contamination, sewer line backups, or property affected by trauma or long-term neglect. We list 7 businesses in London that handle this category.
A proper sewage or biohazard job follows a sequence: containment of the affected area, extraction of standing waste and water, removal of porous materials that can't be fully disinfected (carpet, underlay, drywall, sometimes insulation), cleaning and disinfection of remaining surfaces, and a drying-out phase with monitoring to make sure moisture doesn't linger in walls or subfloor. Waste has to be bagged and disposed of correctly, not just hauled to a regular bin, because it's classed as biohazard material.
We score each business on responsiveness, technical process, and how clearly they document and communicate the work, so you're not just picking a name off a list. See how we weigh these factors on the methodology page, or compare the full set of local specialists in our ranked guide to water damage restoration services in London.
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7 businesses, scored on recent reviews. The order weighs each business's overall score by how much of its reviewed work is sewage & biohazard cleanup, so a lower-scored specialist can rank above a higher-scored generalist.
First Onsite arrives quickly to ice storms, floods, and fires, often within an hour of the call. Staff walk homeowners through each step, handle insurance details without hassle, and ensure property protection and daily cleanup throughout the job.
Fast, professional response and expert guidance through water damage and fire restoration. Mo and his team consistently help homeowners navigate insurance approval, complete mitigation work quickly, and restore property to like-new condition. Reviews highlight thorough assessment, clear communication, and work done ahead of schedule.
Reviewers across water damage, mold, and fire calls report arrival within 40 minutes to an hour, with crews that work efficiently and update them throughout. One recent complaint alleges flooding caused by the company itself with no follow-up. Staff handle basement floods, attic mold, kitchen water damage from appliances, and fire aftermath. The owner personally checks in on jobs. Drying equipment stays on-site for full remediation.
London Extreme Clean earns consistent praise for speed and professionalism across challenging jobs: mold removal, trauma cleanup, and odour elimination. Reviewers often name the team by role, noting both technical skill and genuine compassion during difficult moments. Two complaints document missed callbacks on rental and service inquiries, a notable gap in an otherwise responsive operation.
All four reviewers praised fast arrival times and professional handling of late-night water emergencies. The team used equipment like blowers and dehumidifiers, tracked drying daily, and explained each step clearly.
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Strong emergency response and project coordination have won over many customers, particularly those facing major floods and fires. The team, the team, and other named project managers earned consistent praise for responsiveness and attention. However, pricing complaints surface repeatedly-reviewers report 50% markups and hidden fees that feel opportunistic during crisis situations. Service quality varies sharply by crew: some deliver immaculate work and keep properties clean; others leave jobs only partially finished or conduct themselves unprofessionally on-site. The 3.8-star rating reflects this split, with nearly two-thirds five-star reviews offset by a substantial block of one-star accounts.
Five-star reviews highlight fast response times, clean job sites, and capable crews who handle water damage and fire restoration with respect and care. Two one-star reviews describe extended timelines, poor finishing work, unfinished repairs, and inadequate materials handling on sewage backup jobs, leaving customers frustrated despite insurance payments. Most recent projects show consistent professionalism: teams bring protective covers, deploy equipment promptly, coordinate subcontractors quickly, and maintain open communication. However, isolated cases reveal inconsistency in workmanship quality, particularly in post-damage finishing and material accountability.
Enquiries from our forms may be passed to partner providers who can do the work. We may earn a referral fee, but our rankings and scores are based only on our published method, never influenced by fees.
Last updated 2026-08-12