SJI Electrical carries out consumer unit and fuse board upgrades across Johnstone, Renfrewshire and the wider Greater Glasgow area — from a Paisley base.
The consumer unit is the central control point of your property's electrical system. We inspect first, then explain honestly whether an upgrade is needed.
Three quick questions, then it goes straight to SJI on WhatsApp.
Johnstone's building stock spans an 18th-century planned core around Houstoun Square and estates added from the 1930s onwards, including Johnstone Castle and Cochrane Castle, built out through the 1950s and 60s. Older-style fuse boards still turn up across both, and an upgrade is one of the most common and cost-effective improvements a property can have. We never assume a board needs replacing just because it's old — a proper inspection tells us whether it's genuinely due an upgrade or still doing its job safely. Common signs an upgrade may be worth considering:
A modern consumer unit brings your property's electrical control point up to current standards.

Better protection and increased capacity for the demands of a modern household or workplace.

Improved compliance with modern standards and clearer circuit identification throughout the property.

Fewer nuisance trips and better circuit organisation for day-to-day use.

Every upgrade is fully tested with certification issued on completion.
Considering a full rewire? →Every upgrade follows the same structured approach, whether it's a terraced property near Johnstone's historic centre or a house on one of the town's later estates. Nothing is rushed and nothing is skipped — the sequence below is the same regardless of how straightforward or involved the job turns out to be.
We ensure you understand every stage before work begins.
Send us the details of your Johnstone property and the fuse board it currently has.
We inspect the existing installation and clearly explain our findings.
A clear, written quotation provided before anything is booked in.
An installation date agreed at a time that works for you.
Professional installation, full testing, and certification on completion.
Common signs include an older-style fuse board still fitted, electrical faults or frequent tripping, planned renovation or extension work, a property being prepped for rental, or simply wanting more circuits and improved safety protection. We'll inspect and advise honestly.
Most installations are completed within one day, depending on the property.
Safe isolation of the supply, inspection of existing circuits, removal of the old fuse board, installation of a modern consumer unit, full system testing, and certification on completion.
The supply is safely isolated while the old board is removed and the new consumer unit is installed and tested. We agree the installation date with you in advance so you know exactly what to expect.
Yes. Every fuse board upgrade includes full system testing, and certification is issued on completion by qualified electricians.
It's common, particularly around the town's older core and its 1950s–60s estate housing, but not universal. We inspect the existing board properly before recommending anything.
If your fuse board is older, faulty, or due an upgrade ahead of renovation or rental, contact SJI Electrical for an honest assessment and a clear quote.