Mould & Condensation Services in North London
Black mould and streaming windows are the most common moisture complaints in North London homes — and the most permanently fixable, once the cause is treated instead of the symptom.
How do you fix mould and condensation permanently? Mould grows where surfaces stay damp, and in the vast majority of London homes that dampness is condensation: indoor moisture meeting cold surfaces in under-ventilated rooms. The permanent fix pairs professional mould remediation with a moisture remedy — extraction that meets Part F rates, background or positive input ventilation (PIV), warmth to cold-bridge surfaces — rather than repeated cleaning. Typical North London costs: mould remediation £200–£600 per room, ventilation remedies £300–£1,500, PIV systems £800–£1,500 installed. For landlords, Awaab's Law now sets fixed timescales for investigating and fixing reported damp and mould.
Our mould & condensation services
Black Mould Removal
Black mould is a health issue as well as a building defect. We arrange professional removal that treats the growth safely — and fixes the moisture source so it doesn't come back.
Learn moreCondensation Control
Streaming windows every winter morning, mould creeping across cold corners — condensation is the most common moisture problem in North London homes, and the most fixable.
Learn moreVentilation Solutions (PIV)
The permanent fix for condensation and mould isn't cleaning — it's air movement. We arrange PIV systems, extraction upgrades and whole-home ventilation design across North London.
Learn moreMould Surveys
A mould survey answers the three questions that matter: what's causing it, how serious is it, and exactly what will stop it — in a written report you can act on or rely on.
Learn moreMould in Bathrooms
Black sealant, spotted ceilings, peeling paint above the shower — bathroom mould is the most common mould problem in any home, and almost always an extraction problem in disguise.
Learn moreMould in Bedrooms
You spend a third of your life in the bedroom — which is why mould behind the wardrobe or creeping across the window reveals deserves more than a wipe with bleach.
Learn moreLoft Condensation
Damp lofts are usually condensing, not leaking: warm moist air from the house meets a cold roof and rains back down. We diagnose which it is — and stop it.
Learn moreLandlord Mould Compliance
Damp and mould in rented homes is now a compliance matter with fixed timescales. We give landlords the documented investigation, diagnosis and remediation trail the law expects.
Learn moreLocal stock, local problems, local answers
Converted Victorian flats, draught-proofed terraces, internal bathrooms, sealed windows: North London's housing has been made warmer and more airtight for decades without replacing the ventilation that airtightness removed. The moisture a household produces — ten litres or more a day — now condenses on the coldest surfaces available, and mould follows within weeks.
We treat this as a building-physics problem with a health dimension, not a cleaning task. Assessment measures humidity, surface temperatures and extraction performance; remediation removes existing growth safely; and the ventilation remedy stops regrowth permanently. Where mould traces to fabric damp instead — a leak, penetrating damp, a failed DPC — the diagnosis says so and the right repair follows. And for landlords, every step is documented to the standard Awaab's Law and HHSRS enforcement now expect.
Our process
Tell us the problem
Call or use the contact form — describe what you're seeing and where. Photos help.
Survey & diagnosis
An independent qualified surveyor inspects the property and identifies the true cause, with a written report.
Clear written quote
You receive a costed scope for exactly what the property needs — no more, no less.
Treatment & verification
Works are carried out by vetted independent specialists, with guarantees where applicable and verification that the fix worked.
Frequently asked questions
Winter combines closed windows, cold surfaces and unchanged moisture production — so condensation forms on the coldest spots and mould colonises them. It's the dwelling's ventilation-and-warmth balance, not bad luck, and it's correctable: extraction, background ventilation or PIV, and warming persistent cold bridges.
NHS and UK government guidance link damp and mould with respiratory problems, allergies and asthma, with children, older people and those with existing conditions most at risk. Extent and exposure matter: small spotting should be treated promptly; extensive or recurring growth warrants professional assessment — especially in bedrooms.
For whole-home condensation, positive input ventilation (PIV) has the strongest retrofit track record: £800–£1,500 installed, pence a day to run, and it works continuously without occupant effort. Room-specific problems may need only proper extraction. The assessment tells you which yours is.
Rented homes must be free of serious damp and mould hazards (HHSRS) and fit for habitation; Awaab's Law adds fixed investigation and remediation timescales, applying to social landlords now with private-sector extension planned. Our landlord compliance service provides the documented investigation and works trail the law expects.
We can arrange remediation alone, but we'll tell you plainly: without a moisture fix, regrowth is a matter of weeks. The assessment quantifies the cause so you can decide with full information — usually the ventilation remedy costs less than repeated remediation would.
Worried about damp, mould or a wet basement?
Speak to us today or book a survey — we'll arrange the right independent specialist for your property.