Cost Guide
How Much Does a Legionella Cost? (2026 Guide)
A Legionella typically costs between £75 and £200 for a standard property. Here is what drives the price and how to get good value.
Legionella Price Range
From
£75
To
£200
A standard domestic Legionella risk assessment costs £75–£150 for a typical house or flat. Larger properties, HMOs, or properties with complex water systems (multiple tanks, long pipe runs) cost £150–£200. Some compliance companies offer combined packages with gas safety checks and EICRs at a reduced rate. The assessment itself takes 30–60 minutes on site.
Annualised cost: £38–£100/year (renewed every 24 months)
What Affects the Price
The exact cost of your Legionella depends on several factors:
Property size
Larger properties with more rooms, circuits, or appliances take longer to inspect and cost more.
Property age
Older properties often have more complex or outdated systems that require more thorough inspection.
Location
London and the South East are typically 20-30% more expensive than the national average. Rural areas may attract travel surcharges.
Professional availability
Booking during peak periods (spring, end of financial year) can increase prices due to high demand.
Remedial work
If the inspection reveals defects, repair costs are additional. Always budget for potential remediation.
Regional Price Differences
Legionella costs vary across the UK. Urban areas with more competition tend to have lower prices, while rural and remote locations may charge a premium for travel.
| Region | Typical Range | Notes |
|---|---|---|
| London | £94–£260 | Higher labour costs and parking charges |
| South East | £86–£240 | Slightly above national average |
| Midlands | £75–£200 | National average range |
| North | £68–£180 | Generally lower than national average |
| Scotland | £71–£190 | Similar to North England |
| Wales | £68–£190 | Below national average; rural areas may charge more |
How to Get a Good Price
- Get at least 3 quotes — prices can vary significantly between professionals in the same area
- Bundle multiple properties — if you manage several rentals, negotiate a portfolio rate for inspecting all of them
- Book off-peak — avoid the spring rush and end-of-year deadlines when demand pushes prices up
- Verify qualifications first — the cheapest quote is worthless if the professional is not properly registered. A competent person with knowledge of water systems and Legionella risks
- Ask about combined services — some professionals offer discounts when you combine the Legionella with other inspections
Cost of a Legionella vs Cost of a Fine
Cost of compliance
£75–£200
Cost of non-compliance
£20,000
The maths is simple. A Legionella costs a maximum of £200. The fine for not having one can be £20,000 — plus the loss of Section 21 eviction rights (for some certificates), the cost of emergency remediation, and the reputational damage of a prosecution.
Every pound you spend on compliance saves you hundreds in potential penalties. It is not an expense — it is the cheapest insurance you can buy.
Track Legionella costs across your portfolio
CertWatch logs every certificate cost and reminds you before renewals are due. See your annual compliance spend at a glance and budget accurately.
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Start tracking LegionellaFrequently Asked Questions
How much does a Legionella cost in 2026?
A Legionella typically costs between £75 and £200. A standard domestic Legionella risk assessment costs £75–£150 for a typical house or flat. Larger properties, HMOs, or properties with complex water systems (multiple tanks, long pipe runs) cost £150–£200. Some compliance companies offer combined packages with gas safety checks and EICRs at a reduced rate. The assessment itself takes 30–60 minutes on site. Prices vary by region, property size, and the specific professional you use. London and the South East tend to be at the higher end of the range.
Is a Legionella tax deductible for landlords?
Yes. The cost of a Legionella is an allowable expense that can be deducted from your rental income for tax purposes. Keep the receipt and invoice as evidence. This applies whether you are a sole trader landlord or operate through a limited company.
Can I get a cheaper Legionella by using an unregistered professional?
No — and attempting to do so puts you at serious legal risk. A Legionella must be issued by a qualified, registered professional to be legally valid. A certificate from an unqualified person is worthless in the eyes of the law, and you would be treated as non-compliant. The cost of getting it right is always less than the fine for getting it wrong.