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Second Fix Electrics: Sockets, Lights, and Final Wiring

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What second fix electrics costs for a UK extension (£1,500–5,000), why the bill doubles, and how to get your electrical certificate without delays.

Professional Only£500-1,0001-2 days

Your electrician will quote you a number. You'll pay significantly more than that number. This isn't a scam. It's how second fix electrics works on every extension project, and understanding why is the difference between a budget blowout that blindsides you and one you planned for.

Second fix is when all the cables your electrician buried in the walls during first fix finally get connected to something visible. Faceplates go onto sockets and switches. Light fittings get hung. The consumer unit gets completed, tested, and certified. Your extension goes from a shell with wires poking out of walls to a space with working power.

The work itself takes 3 to 5 days for a typical kitchen extension. But the invoices will arrive over weeks or months, because second fix electrics rarely happens in one clean visit.

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