In 2026, the UK’s electrical standards received another significant update. BS 7671:2018+A4:2026, the latest amendment to the IET Wiring Regulations, introduced new requirements reflecting technologies such as stationary battery storage and Power over Ethernet.
For property owners planning new electrical work, this matters because modern installations increasingly have to accommodate technologies that were far less common in traditional buildings.
Why Electrical Regulations Need to Evolve
Electrical systems are not static.
Decades ago, most properties had relatively straightforward electrical requirements. Today, a building may have an EV charger, solar PV, battery storage, smart controls, network-powered devices and increasingly sophisticated heating systems.
These technologies can change:
- Electrical loads
- Power-flow arrangements
- Protection requirements
- Installation design
- Equipment locations
- Control systems
The IET states that BS 7671 applies to new low-voltage installations as well as additions, alterations and periodic inspection and testing of existing installations.
Stationary Batteries Are Now a Major Consideration
One of the most notable additions in Amendment 4 is a dedicated chapter covering stationary secondary batteries.
Battery storage is becoming increasingly relevant because homeowners and businesses may use batteries alongside renewable generation or as part of broader energy-management systems.
The updated requirements address areas including battery systems, power-conversion equipment, bidirectional energy flow and protective devices. They also address battery location, ventilation and fire-risk considerations.
This reflects an important change in electrical installation: electricity may no longer flow in only one direction.
What Is Bidirectional Energy Flow?
Traditional electrical installations generally operate around electricity moving from the grid into the building.
A property with solar panels and battery storage can work differently.
Energy may be:
- Generated by solar panels
- Used immediately
- Stored in a battery
- Drawn from the battery later
- Supplied by the grid when necessary
Some systems can also interact with EVs and future vehicle-to-home or vehicle-to-grid applications.
This is why modern installation design needs to consider how different energy sources interact.
Power Over Ethernet Is Also Included
Another interesting development in Amendment 4 is the introduction of Section 716 for Power over Ethernet.
PoE allows compatible low-power equipment to receive electrical power through network cabling.
This is increasingly relevant to connected buildings where data and low-power electrical requirements overlap.
Potential applications include:
- LED lighting
- Sensors
- Small connected devices
- Security technology
- Communication equipment
The addition of PoE requirements demonstrates how the definition of electrical infrastructure is expanding beyond conventional mains circuits.
New Installations Need a Broader View
When planning Electrical Installation Shropshire, property owners should consider more than their immediate list of sockets and lights.
It can be useful to ask:
Will the property have an EV charger?
If an EV is likely in the future, planning cable routes and electrical capacity early may simplify later installation.
Could solar panels be added?
Renewable generation can affect the design and protection of the electrical system.
Is battery storage a possibility?
If so, the installation may eventually need to accommodate another energy source and bidirectional power flow.
Will heating become more electric?
Electric heating and heat pumps can increase electrical demand.
Heat Pumps Are Also Changing Electrical Demand
Heat pump adoption has increased substantially over recent years. Government statistics show that 2025 retrofit heat pump installations were 9% higher than in 2024 and more than four and a half times the 2020 figure.
Although installation levels can vary from year to year, the broader trend shows increasing electrification of heating.
This creates another reason to consider future electrical demand when planning property upgrades.
Why Older Installations Can Be Challenging
Adding modern technology to an older property is not always a straightforward matter of connecting new equipment.
An existing installation may have:
- Older protective devices
- Previous alterations
- Limited capacity
- Outdated wiring
- Unclear circuit arrangements
- Historic DIY modifications
Before major additions are made, the existing installation may therefore need assessment.
Professional Installation Is More Than Connecting Equipment
A modern electrician needs to understand how the new equipment interacts with the rest of the installation.
That means considering:
- Existing electrical infrastructure.
- Expected electrical demand.
- Protective devices.
- Cable routes.
- Earthing and bonding.
- Future additions.
- Testing and documentation.
This approach can reduce the chance of discovering avoidable installation limitations halfway through a project.
Why Businesses Should Pay Attention Too
These changes are not limited to homes.
Commercial properties are also adopting:
- EV charging
- Solar generation
- Battery storage
- Smart building systems
- Network-powered equipment
- Electric heating
For businesses planning Electrical Installation Telford, understanding the interaction between these systems can be important when expanding or modernising a property.
The Value of Working With an Experienced Contractor
Severn Volts Limited provides electrical installation, repair and maintenance services for domestic and commercial customers across Telford and Shropshire.
The company states that it has around 20 years of electrical engineering experience and undertakes projects ranging from smaller jobs to larger installations.
For modern electrical work, experience is particularly valuable when a project combines conventional wiring with newer technologies.
Conclusion
The 2026 changes to BS 7671 highlight how quickly electrical installations are evolving. Battery storage, Power over Ethernet, EV charging, renewable generation and electric heating are creating systems that are much more complex than traditional domestic wiring.
For anyone arranging Electrical Installation Shropshire, understanding these developments can help when planning new work or major alterations.
Likewise, property owners considering Electrical Installation Telford can benefit from discussing not only what the property needs today, but also which technologies may become part of the building in the future.
