Stop Treating the Symptom.
We Diagnose and Fix
the Cause.
Forensic mould diagnosis and remediation for homes and businesses across Northern Ireland, based on how your building actually behaves.
Wiping mould off the wall never fixes it.
Northern Ireland’s damp maritime climate, its older solid-wall housing stock and decades of piecemeal extensions make condensation and mould a year-round problem here. Treating the visible growth without correcting the conditions behind it is the reason mould keeps coming back.
Ongoing humidity imbalance
Indoor humidity that sits above the safe 40 to 60% band for long periods gives spores the moisture they need to take hold on cool surfaces.
Ventilation deficiencies
Extractor fans that are undersized, blocked or simply never switched on. Moist air lingers in kitchens and bathrooms instead of leaving the building.
Cold bridging
A familiar problem in Belfast terraces, extensions and around window openings. Cold spots fall below the dew point and pull moisture out of the air.
Heating control limitations
Heating that runs in short bursts lets wall surfaces cool and re-warm repeatedly. Each cycle condenses fresh moisture in the same rooms.
Hidden moisture within materials
Wet plaster, brickwork or insulation hidden behind finishes. Invisible to the eye and only found with capacitance, pin and thermal instruments.
Diagnosis before treatment. Every single time.
Cleaning is the last step, not the first. Each project begins with a structured survey of how the property is behaving, so the cause of the growth is identified and evidenced before anything is treated.
Moisture mapping
Pin and capacitance readings taken across walls, floors and adjacent rooms build a picture of where moisture sits and how far it has travelled.
Across: walls · floors · ceilings · concealed substrates
Dew point analysis
We measure surface temperatures against the calculated dew point for the room. Any surface sitting below it is actively condensing water.
Output: condensation risk by surface
Airflow review
Extract rates, fresh air supply and dead spots are checked room by room against how the property is actually occupied and used.
Across: mechanical · trickle · purge ventilation
Thermal imaging
Infrared survey cross-referenced with the moisture data. Cold bridges, insulation gaps and hidden moisture routes show up clearly.
Output: annotated thermal record
Environmental readings
Humidity and temperature loggers record how conditions move over time, giving a baseline that post-works results are checked against.
Output: RH/temperature evidence record
Delivered as a full package, not individual services.
Everything is delivered as one remediation package. The point is not simply removing what you can see; it is closing off the conditions that allow it to return. We do not sell standalone surveys or inspection-only visits.
Diagnostic assessment
A full instrumented survey of the property, following the diagnostic process above.
Root cause identification
The moisture route is named and evidenced in writing before treatment starts.
Professional mould removal
Containment, safe removal and substrate restoration in line with recognised standards.
Antimicrobial treatment
Treated surfaces are neutralised to deal with any contamination left after removal.
Whole-property sanitisation
Applied across the affected areas of the building where the diagnosis requires it.
Environmental stabilisation
Humidity, ventilation and temperature brought back within specification before sign-off.
Hygiene verification
Before and after readings recorded, documented and signed off against the evidence.
Surveys and inspection-only visits are not sold separately.
Investigation, works and verification are one engagement. Splitting them between different companies is exactly how causes get missed and mould returns.
The goal is not a clean wall next week. It is a property that stays clear.
* Scoping visits are available for housing associations, the Housing Executive, local councils and property managers.
Independent,
diagnostic-led approach.
Much of the damp industry in Northern Ireland exists to sell an install: positive input ventilation, insulation, injected damp courses. We sell none of these, so our diagnosis is never bent toward a product.
Ventilation systems (PIV)
Insulation upgrades
Damp proof courses
Roofing works
Where building improvements are needed we set them out in plain written guidance, and you take it to whichever contractor you trust.
Independent
No product line and no commission. The diagnosis has nothing to sell you.
Evidence-based
Every conclusion is tied to instrument readings and logged data collected on site.
Focused on diagnosis
We are paid for diagnosis and remediation. Nothing else.
Aligned to recognised professional standards.
Our remediation work follows the recognised standards for mould, moisture and building performance used across the UK, documented to a level suitable for social landlords and public bodies in Northern Ireland.
ANSI/IICRC S520
Mould Remediation Standard — the recognised reference for assessment, containment, removal and verification.
BS 5250
Management of Moisture in Buildings — informs how condensation risk is assessed and remedied.
Technical Booklets C, K & F
Resistance to moisture, ventilation and conservation of fuel under the Building Regulations (Northern Ireland).
Structured, compliance-ready remediation for housing associations, councils and property managers across Northern Ireland, delivered to public-sector documentation standards.
Our specialist services.
Three specialist services for owners, landlords and managers. Environmental monitoring and protective coating are delivered inside the remediation package, while qPCR DNA testing is available on its own as a lab-processed service.
Environmental Monitoring
Logs how the property behaves once works are complete, showing whether conditions have genuinely stabilised.
— Humidity and temperature trends, logged
— Identification of ongoing moisture risks
— Documented environmental evidence
— Supports landlord, manager & compliances cases
Available only as part of full remediation package
UV / photocatalytic protective coating
A light-activated coating applied after works to give ongoing protection on surfaces that stay at higher risk.
— External walls & window reveals
— Wardrobes and enclosed spaces
— Bathrooms and high-humidity areas
— Reduces regrowth risk on treated surfaces
Available only as part of full remediation package
qPCR DNA mould testing
A lab surface test that finds hidden contamination and names the species present at DNA level, even where nothing is visible.
— Detects contamination not visible to the eye
— Identifies mould at DNA / species level
— Used by environmental professionals & insurers
— Sample kit dispatched · result returned by report
Standalone. delivered remotely. Lab-processed.
Professionally managed. Personally delivered by Sebastian.
Meet Sebastian, Specialist in Mould Diagnostics & Remediation
Sebastian McCluskey founded Mould Removal Northern Ireland and personally leads its remediation work across Northern Ireland, from Belfast to the north coast.
Diagnosis comes first in every job. Whether the issue is visible growth, suspected hidden moisture, or recovery after fire, smoke or water damage, the cause is identified and evidenced before treatment begins.
Sebastian is IICRC accredited, fully insured and experienced in domestic, commercial and public-sector settings. Each project runs through the same sequence: assess, evidence, remove, treat, verify.
If you want mould investigated and resolved rather than wiped over, Sebastian will assess the situation and give you a straight answer on what happens next.
Mould Removal Northern Ireland is part of Causeway Cleaning Group, alongside Cleaning Contractors NI and Causeway Cleaning.
- Belfast
- Lisburn
- Derry / Londonderry
- Newry
- Bangor
- Ballymena
- Coleraine - and right across Northern Ireland
Just want the wall wiped down? Then we are probably not the right fit.
If you want the cause found, fixed and documented as part of a structured remediation, we should talk.
+44 2895 600 105
info@mouldremovalbelfast.co.uk
The Mount, 2 Woodstock Link,
Belfast, BT6 8DD