Electrical Upgrades in Cardiff — The Foundation of a Safe Solar System
A solar or battery installation is only as good as the electrical infrastructure it connects to. Many Cardiff homes — particularly older properties in areas like Roath (CF24), Canton (CF5), Splott (CF24) and Grangetown (CF11) — have ageing consumer units, insufficient cable capacity or outdated wiring that needs upgrading before a solar system can be safely installed. Cardiff's Victorian and Edwardian housing stock in particular often requires a full consumer unit replacement before any modern renewable energy system can be commissioned.
GL Solar's NAPIT-approved electricians carry out all the electrical upgrade work needed to support your solar or battery installation. From consumer unit replacements and cable upgrades to full rewires and earthing improvements, we ensure your home's electrical system is safe, compliant and ready for renewable energy. Our electricians are registered with NAPIT — the National Association of Professional Inspectors and Testers — meaning all our work is certified and complies with BS 7671 (the IET Wiring Regulations 18th Edition).
We can also carry out electrical upgrades as a standalone service — not just in connection with solar installations. If your home has an old fuse board, insufficient circuits or any electrical safety concerns, our Cardiff team is here to help. We cover all Cardiff postcodes including CF1, CF3, CF5, CF10, CF11, CF14, CF15, CF23, CF24 and the wider South Wales region including Penarth CF64, Barry CF62, Newport NP18/NP19, Caerphilly CF83 and Pontypridd CF37.
As GL Solar's NAPIT-registered electricians, we hold the appropriate qualifications and insurance to notify all work to Building Control — a legal requirement for consumer unit replacements and new circuits. Every job comes with an Electrical Installation Certificate and, where required, an updated EICR. We're proud to be the Cardiff area's trusted single-contractor solution for solar, battery storage, EV chargers and all the electrical upgrade work that comes with them.
What's Included
Consumer Unit Replacement
Replace your old fuse board with a modern consumer unit with RCD and RCBO protection — required for most solar and battery installations in older Cardiff homes.
Cable Upgrades
Upgrade cable sizes to support solar inverters (6–10mm2), battery systems and EV chargers (6mm2 minimum) — ensuring safe, compliant connections.
Earthing & Bonding
Earthing and bonding upgrades to meet current BS 7671 regulations — essential for properties with older wiring systems in Cardiff.
Additional Circuits
Dedicated circuits for solar inverters, battery systems, EV chargers and heat pumps — all notified to Building Control with full certification.
EICR Inspection
Electrical Installation Condition Report (EICR) to identify existing issues before solar installation — required by many Cardiff mortgage lenders and insurers.
Electrical Certificates
All work certified with EIC (Electrical Installation Certificate) and Minor Works certificates — Building Control notification included.
Our Process
Free Electrical Assessment
We assess your existing electrical installation to identify any upgrades needed for solar or battery — usually completed during the solar survey.
Fixed Price Quote
We provide a clear, itemised quote for all required electrical upgrades — no hidden charges or surprises.
Consumer Unit Upgrade
If required, we replace your consumer unit with a modern dual RCD or RCBO unit — typically takes 4–8 hours and requires a power outage.
Cable & Circuit Work
We install any new cables and circuits required for your solar inverter, battery system or EV charger — neatly clipped or run in conduit.
Testing & Inspection
All electrical work is tested and inspected to BS 7671 standards before connection — insulation resistance, earth loop impedance and RCD testing.
Certification & Notification
We issue all required EICs and notify Building Control as required by Part P of the Building Regulations — you receive copies of all documentation.
Why Choose GL Solar Cardiff?
NAPIT Approved
All electrical work carried out by NAPIT-approved electricians — legally qualified to self-certify under Part P of the Building Regulations.
BS 7671 18th Edition
All work complies with the latest IET Wiring Regulations — the 18th Edition (2022 amendment). We keep our training and qualifications fully current.
All Cardiff Postcodes
Local Cardiff team covering CF1–CF24, CF64, CF83 and all surrounding South Wales areas — fast response and no call-out charges.
Full Documentation
Every job includes an Electrical Installation Certificate — your legal proof of compliant, certified electrical work for insurance and conveyancing purposes.
“Our house in Canton had a 1970s fuse board that definitely needed replacing before solar could be installed. GL Solar sorted the consumer unit upgrade on day one and had the solar panels up and running by lunchtime on day two. Everything was done to a really high standard, all the cabling was neat and tidy, and we got our certificates the same day. Absolutely brilliant service.”
Frequently Asked Questions
Areas We Cover in Cardiff & South Wales
GL Solar provides Electrical Upgrades services across Cardiff and the wider South Wales region. Whether you're in the city centre or the surrounding valleys, our local team is ready to help.