Electrical Testing Intervals: A Quick Guide

All electrical installations can deteriorate with age and use. Regular electrical safety testing, conducted by a registered electrical contractor is therefore essential to ensure that electrical equipment and installations remain safe.

How often do I need to test my Electrical Installation?

The guidelines vary between different types of electrical installation. Domestic, industrial and commercial electrical installations command a different recommended schedule.  There are also variations depending on the environment where the installation is used, with public facilities often requiring more regular inspection. 

The table below provides guidance on the frequency of formal inspections of electrical installations as well as routine checks:


Type of Installation

Routine check

Maximum period between 
inspections and testing 
as necessary

General installation      
Domestic accommodation – 
Domestic accommodation – 
rented houses and flats

change of occupancy/10 years 
change of occupancy/5 years

Commercial 1 year change of occupancy/5 years  
Educational establishments 6 months 5 years  
Hospitals and medical clinics – 
general areas 
Hospitals and medical clinics – 
medical locations
1 year 

6 months

5 years 

1 year

Industrial 1 year 3 years  
Residential accommodation (Houses of 
Multiple Occupation) – halls of residence, 
nurse’s accommodation, etc.
1 year Change of occupancy/5 years  
Offices 1 year 5 years  
Shops 1 year 5 years  
Laboratories 1 year 5 years  
Buildings open to the public      
Cinemas 1 year 1-3 years  
Church installations 1 year 5 years  
Leisure complexes 
(excluding swimming pools)
1 year 3 years  
Places of public entertainment 1 year 3 years  
Restaurants and hotels 1 year 5 years  
Theatres 1 year 3 years  
Public houses 1 year 5 years  
Village halls/Community centres 1 year 5 years  
Special and specific installations 
(for medical locations see above)
Agricultural and horticultural 1 year 3 years  
Swimming pools 4 months 1 year  
Caravan parks
1 year 
6 months
3 years 
1 year
Highway power supplies as convenient 6-8 years  
Marinas 4 months 1 year  
Fish farms 4 months 1 year  
Emergency lighting daily/monthly 3 years  
Fire alarms daily/weekly 1 year  
Launderettes monthly 1 year  
Petrol filling stations 1 year 1 year  
Construction site installations 3 months 3 months


For many businesses, ensuring compliance in the face of increasingly complex regulation and codes of practice can be something of a challenge.

Mobius can take care of all your compliance and maintenance needs, including electrical testing, ensuring that you don’t fall foul of legislation and that you protect the health and safety of your employees, customers and the wider public.

Contact us

Talk to us about your fit out requirements today