Commercial Damp Survey
Damp in a commercial property is more than a maintenance issue — it threatens stock, equipment, staff wellbeing, lease obligations, and the value of the asset itself. Our commercial damp surveys give building owners, occupiers, and managing agents a precise diagnosis of moisture problems and a clear, costed path to resolving them.
Commercial buildings present different damp challenges to housing: flat roofs, parapet walls, concrete frames, suspended ceilings that hide leaks for months, and intensive internal environments from kitchens, gyms, or production processes. Our surveyors are experienced across London's commercial stock — from converted Victorian shopfronts to modern office floors — and know where moisture hides in each.
We work around your trading hours wherever possible, including early morning, evening, and weekend inspections, so the survey doesn't interrupt your business.
What the Commercial Damp Survey Covers
- Moisture investigation of all affected and at-risk areas, including behind fixtures and above suspended ceilings where accessible
- External envelope review: roof line, parapets, copings, render, cladding junctions, and rainwater goods
- Assessment of below-ground areas — basements, cellars, and storage vaults — for penetrating and ground moisture
- Environmental monitoring of humidity and condensation risk in intensive-use areas
- Identification of moisture sources: leaks, penetrating damp, rising damp, condensation, or services failures
- Practical assessment of impact on stock, finishes, and building fabric
Signs You Need This Survey
- Staining or damp patches on walls, ceilings, or ceiling tiles
- Musty odour in back-of-house, storage, or basement areas
- Blistering paint or failing plaster on internal walls
- Mould growth in staff areas, kitchens, or washrooms
- Damage to stock or packaging stored against external walls
- Complaints from staff or customers about air quality
Who This Survey Is For
Commercial landlords and property managers investigating tenant reports; occupiers concerned about the condition of their demise or their repairing obligations under a lease; buyers and investors wanting damp risks quantified before acquisition; and facilities managers who need an independent specialist assessment before committing to remedial expenditure. Our reports are written to be usable in landlord-tenant discussions, dilapidations contexts, and insurance claims.
Our Survey Process
1. Scoping call
We discuss the premises, the symptoms, access arrangements, and any lease or transaction deadlines, then agree the survey scope and a time that works around your business operations.
2. On-site moisture investigation
Our surveyor inspects all agreed areas using calibrated moisture meters, thermal imaging, and hygrometry — tracing moisture to its source rather than just recording where it shows. Suspended ceilings, risers, and concealed areas are checked where access allows.
3. External and roof-level review
Commercial damp frequently originates at roof level or from external envelope defects. We review parapets, flashings, flat roof coverings, copings, and rainwater goods to identify the external defects driving internal symptoms.
4. Business impact assessment
We assess what the moisture problem means practically — risk to stock and equipment, staff welfare considerations, and whether the issue engages repairing obligations under the lease.
5. Report and remedial strategy
You receive a clear written report with photographs, findings, diagnosis, and a prioritised remedial strategy — separating urgent works from planned maintenance, so expenditure can be budgeted sensibly.
What You Receive
- A professional written report with photographic evidence and moisture data
- Clear diagnosis of each moisture issue and its source
- Prioritised remedial recommendations: urgent, short-term, and planned
- Guidance suitable for lease, dilapidations, and insurance discussions
- Practical advice on protecting stock and operations while works are arranged
Why Choose Henderson Wood?
- Surveyors experienced across London's commercial building stock
- Out-of-hours inspections available to avoid business disruption
- Independent findings — no remedial sales agenda
- Reports written for commercial audiences: landlords, agents, insurers, and solicitors
- Fast turnaround to meet transaction and lease deadlines
- Follow-up support to interpret contractor quotations
Frequently Asked Questions
How much does a commercial damp survey cost in London?
Commercial survey pricing depends on the size and complexity of the premises — a single retail unit is very different from a multi-floor office building. Contact us with the property details and we'll give you a fixed quotation before any commitment.
Can you survey outside business hours?
Yes. We regularly carry out commercial inspections early morning, in the evening, or at weekends so trading isn't interrupted. Let us know your constraints when booking and we'll work around them.
Who is responsible for damp in a leased commercial property?
It depends on the lease — repairing obligations vary significantly between full repairing and insuring (FRI) leases and internal-only demises. Our survey identifies the source and location of the moisture, which is usually the key fact in determining whether landlord or tenant is responsible. Many clients commission our report precisely to clarify this.
Will the survey disrupt our business?
Minimal disruption is a design goal of our commercial surveys. Inspection is non-destructive, the surveyor works around your staff and customers, and areas are inspected in a sequence agreed with you on arrival.
Can the report be used for an insurance claim?
Yes. Our reports document the cause, extent, and severity of moisture damage with photographs and readings — the evidence insurers typically require. If the damage stems from an insured peril such as an escape of water, the report supports your claim; if not, it tells you that before you spend time on one.
When to Book
- • A tenant or staff member has reported damp or mould
- • Damp staining has appeared on ceilings or walls
- • Before acquiring or leasing a commercial unit
- • Ahead of a dilapidations negotiation
- • Stock or equipment is being damaged in storage areas
- • An insurer or landlord has requested professional evidence