Mould Surveys in North London
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.
What does a mould survey involve? A mould survey inspects all affected and at-risk areas, maps the growth, measures humidity, surface temperatures and ventilation performance, and profiles wall moisture to establish the cause — condensation in most cases, fabric damp in some. It grades severity by extent, location and occupant vulnerability, and concludes with a written report specifying remediation and the moisture fix, with indicative costs. In North London a mould survey costs £150–£300 for homeowners; landlord compliance versions with HHSRS-aware reporting run £300–£500.
Understanding the problem
Mould disputes fail for lack of evidence. A tenant reports mould; a landlord's contractor wipes it off; it returns; positions harden. A homeowner buys a mould-treated flat and inherits the untreated cause. What resolves these situations is the same thing that fixes the mould: an independent, documented diagnosis.
Since Awaab's Law set fixed investigation timescales for damp and mould hazards in social housing — with private-sector extension planned — a professional survey has also become the compliance instrument: it evidences that a report was investigated competently and that works address cause, not just appearance.
When to commission a mould survey
- Recurring mould that returns after cleaning or redecorating
- A tenant's damp and mould report requiring documented investigation
- Health concerns in the household — children, respiratory conditions
- Pre-purchase: visible or suspected concealed mould in a property you're buying
- Dispute over responsibility between tenant and landlord
- Extensive growth (more than patchy spotting) anywhere in the home
Getting the diagnosis right
The survey method: visual mapping of all growth including concealed checks (behind furniture, inside wardrobes, under window boards); environmental measurement — relative humidity, surface temperatures, dew-point margins; extraction flow tests; and moisture profiling to separate condensation from penetrating or rising damp. Severity grading follows the pattern used in our free Mould Severity Checker, weighting extent, room type and occupant vulnerability. Where required for compliance, findings are framed against HHSRS damp-and-mould hazard criteria.
What you receive
The report specifies:
- The diagnosed cause with the supporting evidence
- Severity grading and any urgency indicators
- A remediation scope — what is cleaned, what is removed and replaced (see black mould removal)
- The moisture remedy — ventilation works, insulation, or damp repair, with indicative costs
- For landlords: documentation aligned to Awaab's Law timescales and HHSRS reporting; see landlord mould compliance
What does it cost in North London?
| Item | Indicative range |
|---|---|
| Homeowner mould survey | £150 – £300 |
| Landlord compliance mould inspection + report | £300 – £500 |
| Pre-purchase mould inspection | £200 – £400 |
| Follow-up verification visit | £100 – £180 |
Survey fees are often offset against remediation if you proceed with the same provider — confirm when booking. Figures are indicative for North London (2026) and vary with property, access and scope — written quotations follow a survey. See the North London Damp Cost Guide or try the Damp Proofing Cost Calculator.
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
£150–£300 for a standard homeowner survey in North London; £300–£500 for landlord compliance inspections with HHSRS-aware written reporting; £200–£400 for pre-purchase inspections.
If mould is the presenting problem, a mould survey covers it — and includes the moisture diagnosis. If you have damp without significant mould (tide marks, rain-related patches), a damp survey is the right instrument. Combined inspections are available for properties with both.
It establishes the cause — which is the factual basis responsibility turns on. Condensation driven by inadequate ventilation provision points one way; unreported spillages or blocked vents another. The report documents the evidence; how it's used in a tenancy dispute is then a matter for the parties and, if needed, their advisers.
Standard surveys diagnose by inspection and environmental measurement, which is sufficient for almost all residential cases. Laboratory air or surface sampling can be arranged where specifically needed — for example medical correlation — at additional cost.
Tell us the deadline when you book. Compliance-driven inspections are prioritised, and the written report can typically be turned around within the investigation window when booked promptly after the tenant's report.
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.