Testing & Inspection FAQs

Testing and Inspection
Part P Explained
Part L Explained

Testing and Inspection

It is recommended that all electrical installations should be tested and inspected periodically to ensure compliance with BS7671 (Requirements for Electrical Installations) to ensure that the installation is fit for purpose and safe to use.

All consumer units whether they are in a domestic setting or within a commercial/industrial setting, should be clearly labeled and have inspection stickers clearly showing the date of the last inspection and the date of when the next inspection is due.

Frequency for Testing:

Although this is dependent on the type of installation to be inspected, it’s use and operation, the frequency and quality of any maintenance work being undertaken on the installation and any external influences which it may be subjected to, as a general rule of thumb frequency for testing will be as follows:

Domestic Installations, every 10 years
Rented Premises, every 5 years
Commercial & Industrial Premises, every 5 years
Swimming Pools, annually

Other times when you might want to consider a Test and Inspection on your property are:

• Prior to selling/purchasing a property
• When a property is being prepared for renting purposes

What do you get from a Test and Inspection?

• A Periodic Inspection Report for your property’s electrical installation – BS7671 Compliant
• Schedule of Test Results
• A description of any remedial works required and a no obligation quotation for your consideration
• Professional and Technical advices from a qualified engineer
• All work guaranteed

Why must you have a Periodic Inspection and Test?

Periodic inspection and testing is necessary because all installations will deteriorate due to a number of factors:

• Age
• Wear and Tear
• Corrosion
• Damage
• Overloading of electrical circuits
• Changes in legislation

Therefore, legislation requires that electrical installations are maintained in a safe condition and manner and must be periodically tested to check compliance.

Commercial and Industrial Installations by law, and in accordance with the Electricity at Work Regulations 1989, must ensure that precautions are taken against the risk of death or personal injury from electricity at work activities. Neglecting faulty electrical systems could result in injuries to employees, loss of income and fines from organisations found to be in breach of statutory responsibilities. In some instances it may invalidate insurance claims and there is also a move towards custodial sentences for Directors of Companies found to be in breach of their obligations.

Insurance companies, mortgage lenders, public bodies, licensing authorities etc may require period inspection and testing of electrical installations to ensure compliance with BS7671 and the Electricity at Work Regulations 1989.

Periodic inspection and testing should also be considered when the following occurs:

• There is a change of tenants to rented premises
• There is a change of ownership to a property
• There is a change to the use of a property
• When there have been any alterations, additions, changes to the current electrical installation
• If there has been any damage caused e.g. overloading a circuit or changing the loading significantly.

What is the cost?

Costs will vary depending on the installation, size and number of circuits within a property.

Therefore, for your free, no obligation quotation for a test and inspection on your property, please contact our offices.

Part P Explained

With effect from 1 January 2005 it became a legal requirement for electricians, kitchen, bathroom, gas installers and all other trades involved in carrying out domestic electrical installation work in dwellings to comply with the new electrical safety law – Part P of the Building Regulations (BS7671:2001) Standards.

The purpose of Part P is to reduce the number of deaths, injuries and fires caused by faulty electrical installations and make if harder for “cowboys” to leave electrical installations in an unsafe condition.

The list below informs you of the type of electrical installation work and locations that must comply with Part P requirements:

Type of work


  • New installation, rewire or partial rewire
  • New consumer unit
  • One or more new circuits
  • Extension to circuit (in kitchen, special location*/installation**)
  • Main/supplementary equipotential bonding
  • Ring/radial power
  • Lighting circuit
  • Heating (central heating/room heating/hot water/boiler/controls
  • Air conditioning/ventilation system/extractor fan
  • Shower (electrically heated or pumped)
  • Cooker
  • Fire/security/environmental control system
  • Vertical lift or stair lift (within dwelling)
  • Special installation*
  • Building sharing supply with dwelling
  • Building extension or conservatory
  • Common area of block of flats
  • Flat
  • Dwelling house
  • Detached shed, garage or greenhouse
  • Kitchen
  • Garden
  • Special location**

* Special installation: electric floor/ceiling heating; garden lighting/power; ELV lighting; generator
** Special location: a room containing bath or shower, swimming pool, sauna

If you do not use a Part P registered Person or Company then:

•You will have no guarantee that the electrical installation is safe
•You will have no official record of the work that has been carried out
•You may have difficulty selling your home if you do not have the correct electrical safety certificates
•The building control department of your local authority can insist that any faulty work is put right
Ambassador Electrical Services Ltd is a member of

Tel: 0845 634 9043
Fax: 0845 634 9039
E-mail: enquiries@elecsa.co.uk
Website: http://www.elecsa.co.uk
Our Certificate Number is : EPP1725

As a registered and approved contractor for Part P, we offer all our customers the option of taking out an ECA insurance-backed guarantee for the work we install.

What is Part L?

Part L of the Building Regulations was first introduced in 1995 and concerns the efficient use of energy within buildings. The revised version of Part L took effect from 6 April 2006.

Part L has been revised as part of the Government's drive to reduce greenhouse gas emissions. One important way of achieving this is by improving the energy efficiency of buildings.

What are the Changes to Part L?

The new requirement is as follows: Part L of the Building Regulations imposes the requirement on building work that:

Reasonable provision shall be made for the conservation of fuel and power in buildings by:

1. Limiting heat gains and losses:

i. through thermal elements and other parts of the building fabric; and
ii. from pipes, ducts and vessels used for space heating, space cooling and hot water services;

2. Providing and commissioning energy efficient fixed building services with effective controls; and

3. Providing to the owner sufficient information about the building, the fixed building services and their maintenance requirements so that the building can be operated in such a manner as to use no more fuel and power than is reasonable in the circumstances.

Why has Part L been introduced?

Part L has been introduced in order to reduce greenhouse gas emissions as part of the Government’s strategy to address global warming.