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Service
Mould Removal London & South East
Aridom Sanex responds to mould contamination in homes, social housing, commercial premises, healthcare and heritage settings across London, Kent and the South East. We combine targeted cleaning of visible growth with, where an assessment justifies it, dry fogging of the surrounding space using Paqualyte, our hypochlorous acid (HOCl) product.
Neither cleaning nor fogging deals with the cause. The moisture source still has to be found and repaired by the building owner or a contractor.
Settings we work in: homes and HMOs; offices and schools; healthcare and care settings; hospitality and leisure venues; retail and transport; dental and veterinary clinics; food-adjacent environments, including farms, greenhouses and cold stores, by assessment; and heritage and historic buildings, including archives and collections.
For landlords: act quickly, document everything
Awaab’s Law sets fixed timescales for social landlords in England to investigate and make safe significant hazards, including damp and mould.
Damp and mould duties have applied since 27 October 2025. From 30 November 2026 further hazards are added, including excess cold and excess heat. For significant hazards the landlord must investigate within 10 working days, give the tenant a written summary within 3 working days of the investigation concluding, and complete safety work within 5 working days of the investigation ending. Emergency hazards must be investigated and made safe within 24 hours.
These duties sit with the landlord. We can support with an assessment of visible mould and its likely causes, documented cleaning and, where justified, dry fogging. We do not replace the landlord’s duty to investigate and repair.
Read the GOV.UK guidance on Awaab’s Law
What we do
Assessment first, then targeted cleaning and, where justified, dry fogging
- Assessment: visual inspection of the affected areas, with photographs. We do not carry out air sampling. Where it would answer a defined question, an independent laboratory can.
- Targeted cleaning: removal of visible growth using methods that minimise spore spread.
- Dry fogging, where an assessment justifies it: our automated dry fogging devices produce droplets under 5 microns, so fog can reach areas that are hard to treat by hand, using low volumes of liquid.
- Evidence pack for your file: before and after photographs, a record of the cleaning and fogging, product name and batch, safety data sheet, safe system of work, and re-entry criteria agreed with you.
- Environmental approach: Paqualyte is a hypochlorous acid product. Discharge and ventilation requirements are considered for each site.
Our standard HOCl product is classified as set out in its current safety data sheet, which we supply on request. Ventilation, dosing and re-entry criteria are set for each job. We make no medical claims.
Who we prioritise
Landlords, agents and managers who need a documented response
- Social landlords: councils, ALMOs and housing associations, including documentation to support hazard assessments and complaint handling.
- Private landlords and agents: including HMOs and multi-unit blocks.
- Occupied buildings with vulnerable residents: we treat these as a priority for response times. Anyone with a health condition should take medical advice.
Heritage buildings and collections
Mould assessment and remediation for historic buildings and collections
Lime plaster, timber, stone, historic paints, textiles, books and manuscripts can be damaged by wet methods and by some chemicals. We assess each site and agree the approach with you and, where appropriate, your conservator.
Collections need particular care. Treating a room is not the same as treating a collection, and conservation advice comes first. Read our guide to mould in archives and heritage collections, then request a confidential assessment.
How we approach heritage settings: dry fogging uses low volumes of liquid and does not soak surfaces. Compatibility with the specific materials in your building is assessed before any treatment, with your conservator where one is involved. Protective measures are agreed for each site.
Typical challenges: protecting irreplaceable materials; working within conservation guidelines and tight access windows; maintaining architectural authenticity and breathability.
We serve London, Kent, Surrey, Sussex and the wider South East. Other UK regions by arrangement (additional costs might apply).
Dry fogging as part of mould remediation
Used after cleaning, and only where an assessment shows it would help
How it is used: dry fogging is normally carried out after the visible mould has been physically cleaned, and only where an assessment shows it would help.
Recurrence: fogging does not stop mould returning. Whether it returns depends on whether the moisture, ventilation or building problem has been resolved. We record what we find and make recommendations to the building owner.
Maintenance fogging: where regular fogging is appropriate, for example in a controlled environment, we can agree a schedule after assessment. It supports routine cleaning. It does not replace cleaning and does not remove the cause of contamination.
Request an assessment
How we work
Assessment, cleaning and, where justified, dry fogging
- Survey: heritage-aware visual inspection and risk assessment, with a test patch where appropriate.
- Cleaning: targeted cleaning of visible growth using techniques that minimise spore spread.
- Dry fogging, where justified: treatment of the room volume to reach difficult areas.
- Documentation: before and after photographs, a record of the cleaning and fogging, product name and batch, safety data sheet, safe system of work and re-entry criteria.
What to expect: we do not claim total eradication, because spores exist in outdoor air. We record the visible condition before and after, and advise on the conditions that allow mould to return. The building repairs that stop the damp are for your contractor.
What we can and cannot promise
Where we draw the line on claims
We cannot remove all mould from any environment, because spores are present in outdoor air. We do not offer guarantees of elimination or of non-recurrence.
We can treat the contamination within an agreed scope, document the work, and tell you what in the building is likely to be driving the problem.
We do not carry out air sampling. Where it would help answer a defined question, an independent laboratory can.
Heritage building enquiry