Commercial Rewires & Electrical InstallationsWhat Shropshire Businesses Should Know

Whether you're taking on a warehouse, refreshing a retail unit or upgrading machinery supplies, commercial electrical work has to meet BS 7671, support your operations and keep downtime under control. Here's a practical overview of full and partial rewires, distribution boards and three-phase installations — and how to plan them properly.

When Does a Commercial Premises Need a Rewire or Major Upgrade?

Unlike homes, commercial buildings often evolve: new plant, extended opening hours, extra IT load or a change of use can outstrip what the original installation was designed for. Warning signs include frequent nuisance tripping, warm distribution equipment, insufficient spare ways, or an EICR that records C1, C2 or FI observations. If you're fitting out or changing the layout, it's the right time to review the whole strategy — not just add circuits ad hoc.

Full vs Partial Commercial Rewires

A full rewire replaces cabling and accessories across the installation (or a defined part of the building). A partial rewire targets specific areas — for example a new production line, an extended mezzanine or a single floor of an office block. The right approach depends on the condition of existing wiring, your growth plans and budget. We always start with a site survey and, where useful, existing test records or the latest EICR.

Distribution Boards, Sub-Mains and Three-Phase Supplies

Commercial sites often use a mix of single-phase and three-phase supplies for motors, large HVAC plant and heavy kitchen equipment. Upgrading the main or sub-distribution boards may be essential before adding load. That can include RCBO protection, surge considerations, selectivity between devices and clear labelling for maintenance. Getting this right upfront avoids expensive rework when you expand.

Minimising Disruption to Your Business

We work with your site or project manager to sequence power-offs, phased handovers and out-of-hours working where needed. Clear communication about which areas are affected — and when — helps you plan stock, staff and customer access. For critical systems, temporary supplies or generator coordination can sometimes be arranged; we'll flag options at quotation stage.

Certification and Compliance

Notifiable work must be completed by a competent person and certificated appropriately — typically an Electrical Installation Certificate (EIC) for new work or an EIC/MIN depending on scope. As NICEIC Domestic Installers, we self-certify where applicable and provide the documentation insurers and landlords expect.