"It's just a bit of mould." It isn't. The real cost of letting damp and mould go untreated — especially as a landlord — can run into the tens of thousands once you factor in fines, claims, void periods, and structural damage.
1. Regulatory Fines
Under the Housing Health and Safety Rating System (HHSRS), local authorities can issue improvement notices, prohibition orders, and financial penalties. Penalties include:
- • Civil penalties from local authorities
- • Unlimited fines through the courts for the most serious cases
- • Rent Repayment Orders requiring rent to be paid back
- • Banning orders preventing the landlord from letting properties
- • Criminal prosecution in cases of serious neglect
Recognise this in your own property? Book a survey or call 07453 527 205.
2. Tenant Compensation Claims
Housing disrepair claims have exploded in recent years. Tenants can claim for:
- • Damage to personal belongings (ruined clothes, furniture, electronics)
- • Health-related damages (respiratory conditions, sleep disruption)
- • Inconvenience and distress
- • Rent reductions for the duration of the disrepair
Settlement amounts vary depending on the severity and duration of the disrepair. Landlords usually also pay the tenant's legal costs.
3. Void Periods
A property with obvious damp and mould won't let quickly. Letting agents report:
Longer
Void Period
Additional void period for properties with visible damp issues
Lost
Rent
Rent lost during an extended void on a Lincoln property
Lower
Rent Achieved
Discount tenants expect on properties with historic damp problems
Where a property has a history of damp, a dated record of its condition at the start of the next tenancy makes it far easier to show whether damp was there before the tenant moved in. Our sister brand The Surveyor Co, also a trading name of LW Renovation Group Ltd, carries out an Inventory and Schedule of Condition for exactly that.
4. Structural Damage
Ignored damp doesn't stay still — it spreads and causes progressive structural decay:
- • Timber decay: wet rot and dry rot in joists, skirtings, and structural timbers. Dry rot alone can be costly to remediate once it spreads.
- • Plaster failure: contaminated plaster needs full removal and replacement.
- • Brickwork damage: long-term saturation leads to frost damage and spalling, requiring costly repointing or rebuilding.
- • Electrical hazards: moisture in walls compromises wiring and consumer units.
5. Property Value
Survey reports noting damp issues can reduce market value, meaning a meaningful amount off the sale price. Mortgage lenders may also refuse to lend on properties with significant untreated damp, shrinking the buyer pool further.
6. Insurance Implications
Most buildings insurance policies exclude damage caused by long-term damp and gradual deterioration. Once a problem is identified, the window to act under warranty or insurance closes quickly. Ignoring it means you're uninsured for the consequences.
Worked Example (Illustrative Figures)
Imagine a Lincoln landlord ignored tenant complaints about bedroom mould for 14 months. The likely outcome:
- • Tenant claim: £4,800 settlement + legal costs of £3,200
- • Local authority improvement notice: £1,200 admin charge
- • Remediation (once escalated): £6,500 — vs ~£2,500 if caught early
- • Void period during works: £2,100 lost rent
- • Reduced rent at re-let (stigma): £600/year
Total first-year cost: £17,800+ — all avoidable with a £250 survey and prompt action.
The Cheap Option Is to Act Early
A comprehensive damp and mould survey costs £250+VAT. Early remediation of condensation issues can be as simple as installing a PIV unit and improving bathroom extraction. Compared to the costs above, it's the cheapest decision you can make as a landlord.
And with HHSRS enforcement well established, "we didn't know" is no longer a defence. The legal, financial, and reputational cost of inaction has never been higher.
FAQ · Frequently Asked
Common Questions
What fines can landlords face for ignoring mould?+
If a council serves an improvement notice and it isn't complied with, local authorities can issue civil penalties, and the courts can impose unlimited fines in the most serious cases. Landlords can also face Rent Repayment Orders, banning orders preventing them from letting properties, and criminal prosecution for serious neglect.
How much can a tenant claim for mould-related disrepair?+
Settlement amounts vary depending on the severity and duration of the disrepair, and landlords usually also cover the tenant's legal costs. Claims can cover damaged belongings, health-related damages, distress, and rent reductions for the period of disrepair.
Does mould affect a property's rental or sale value?+
Yes. Survey reports noting damp issues can reduce market value, and properties with visible damp typically face extra void time plus tenants expecting a rent discount on properties with a history of damp problems.
Is mould damage covered by buildings insurance?+
Usually not. Most buildings insurance policies exclude damage caused by long-term damp and gradual deterioration, so once a problem is identified and left untreated, you're typically uninsured for the consequences.
What's the cheapest way to avoid these costs?+
Act early. A comprehensive survey costs £250+VAT, and simple condensation fixes like a PIV unit and improved bathroom extraction are inexpensive next to the alternative. In the worked example elsewhere in this guide, a landlord who ignored a mould complaint for 14 months faced significant first-year costs from claims, fines, remediation and lost rent.
