What this job involves and what it costs
Surge protection installations from £500–£700 (typical Medway cost, inspection-based). Work meets BS 7671 with coordinated Type 2 SPDs as required; we isolate safely, install, label and complete verification tests, provide relevant electrical certification and a written fixed quote, and include warranty transfer/support where applicable.
Around Medway the housing we see most is dense Victorian terraces in Strood, Chatham and Gillingham, dockyard-era housing, large post-war estates and new-build on the riverside and at Rochester Riverside. That shapes the work we are called to: dense rental and HMO stock across five towns, landlord EICRs and fire alarms, riverside new-build snagging and EV chargers. Every job is priced in writing before we start, and the same NICEIC standards apply whether the property is a period terrace or a new-build flat.
When you need it
- Your consumer unit is being replaced and you’re told surge protection might be needed.
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Usually means the electrician’s risk assessment found a chance of damaging surges from the supply or nearby events.
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Your lights flicker or dim when you turn the kettle or other heavy appliance on.
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Usually means voltage fluctuations or switching surges that can stress sensitive electronics.
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New or expensive electronics (computers, TVs, smart home devices) fail shortly after a nearby lightning storm or power fault.
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Usually means they were exposed to an overvoltage or transient spike.
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Your alarm, heating controls or EV charger behave erratically or stop working after power interruptions.
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Usually means surges or switching events are affecting their sensitive circuitry.
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Networked appliances or smart devices lose settings or become unreliable after routine switching on the supply.
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Usually means repeated small surges or poor supply quality are upsetting them.
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You’ve had a flood and afterwards appliances or sockets around the incoming supply smell, spark, or trip repeatedly.
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Usually means incoming supply, earthing or equipment may have been damaged and now allow unsafe voltages or faults.
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An electrician mentions the need to check coordination with RCDs, earthing and manufacturer instructions while doing work.
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Usually means proper protection needs to be matched to your system and device requirements so surge protection will work correctly.
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You’re told a Type 2 surge protection device might be appropriate and that the decision will be recorded.
- Usually means a contractor thinks a point-of-entry or distribution-level SPD could reduce the risk to your installation and will note it in the electrical paperwork.
What it costs in Medway
If a surge protection device (SPD) is needed, we’ll carry out a free survey and provide a fixed written price before work starts. Below are typical charges and what’s included.
| Job | Price | What's included |
|---|---|---|
| SPD installation | Quoted per job after a free survey | Parts, labour, VAT, testing and certification; specification of surge monitoring applicability and SPD coordination; warranty terms and 12-month workmanship guarantee |
| Labour | £80 per hour | Time on site for installation, testing and certification |
| Day rate | £600 | Full-day on-site labour and testing |
| Emergency attendance | £120 per hour (first hour minimum) | Urgent attendance and repair work, testing and certification |
Not included: plaster repairs, decoration, asbestos removal, DNO supply‑upgrade charges, scaffold or access equipment.
What is involved on the day
On the day, we survey your installation, confirm the earthing arrangement and safely isolate the relevant consumer unit circuits. We install the correctly specified surge protective device, keeping conductor lengths and connections compliant with BS 7671 requirements. We then test the installation and provide the appropriate electrical certificate.
Survey and isolation
Before fitting surge protection, we survey the installation to confirm the supply arrangement, earthing and bonding, consumer unit condition, available ways and cable routes. Our survey checklist also considers the incoming service position, main protective bonding conductors, existing RCD arrangement and whether the enclosure provides suitable space and access. We identify signs of overheating, damage, obsolete wiring or aluminium conductors that could affect safe work, particularly in older Medway properties.
We then explain the proposed interruption to supply and agree a suitable time for isolation. Following recognised isolation procedures, we identify the correct point of isolation, secure it against reconnection where practicable, prove the tester, test for dead, and re-prove the tester. You’ll need to plan for equipment that must remain powered, including alarms, refrigeration, broadband and medical devices.
Installation
With the installation safely isolated, we fit the specified surge protective device (SPD) at the consumer unit in accordance with BS 7671 and the manufacturer’s instructions. We position it to keep connecting conductors as short and direct as practicable, maintaining the required conductor sizes, protective-device arrangements and enclosure integrity. Where the survey identifies incoming services or sensitive circuits, our surge mapping informs the SPD location and any coordinated protection requirements. We install the correct Type 1, Type 2 or combined device specified for your installation, ensuring compatibility with the consumer unit and earthing arrangement. We label the installation clearly and retain manufacturer documentation, including warranty terms, for your records. If the existing consumer unit cannot safely accommodate the device, we’ll explain the compliant options before proceeding.
Testing
Once the SPD is installed, we test the consumer unit and associated circuits to confirm correct operation, continuity of protective conductors, polarity, earthing arrangements and protective-device performance in accordance with BS 7671. We isolate and reinstate supplies safely, then verify that the SPD is correctly connected, suitably protected and installed with conductor lengths kept as short as practicable. We measure earth fault loop impedance where applicable and confirm prospective fault current remains within the ratings of installed protective devices.
Surge testing does not normally involve applying destructive voltage impulses to a live domestic installation. Instead, we check the SPD’s status indication, configuration, upstream overcurrent protection and manufacturer requirements. Our transient analysis considers the supply arrangement, bonding, cable routing and whether sensitive equipment needs additional point-of-use protection. Any identified defect is addressed before the installation is left energised.
Certificate
Following satisfactory testing, we’ll issue the appropriate BS 7671 certification for the surge protection work, normally an Electrical Installation Certificate or a Minor Electrical Installation Works Certificate depending on the extent of alteration. Your document records the consumer unit details, SPD type and location, protective-device coordination, earthing arrangement, test results and any observations requiring attention. We’ll identify the installation as compliant only where inspection and testing confirm conformity with the relevant requirements of BS 7671.
This surge certification provides an auditable record for future electrical work, property files and insurers where requested. We’ll explain the SPD status indication and the need to replace a unit showing end-of-life or fault indication. You’ll also receive our written invoice and workmanship warranty terms, including the 12-month guarantee and any manufacturer conditions applying to the device.
Options and what we recommend
We’ll assess the incoming supply arrangement, earthing system and consumer unit before specifying surge protection, as the correct device type and installation position depend on the property’s risk profile and existing equipment. For most Medway homes, we recommend a Type 2 SPD at the origin, coordinated with the consumer unit’s protective devices and connected using suitably short conductors.
| Property situation | Recommended approach |
|---|---|
| Standard domestic supply | Type 2 SPD at consumer unit |
| Overhead-line exposure | Type 1+2 coordinated SPD |
Where sensitive electronics, heat pumps or chargepoints are present, surge monitoring can identify an end-of-life device promptly. We’ll select equipment with the appropriate nominal discharge current, voltage protection level and follow-current rating. A manufacturer warranty extension may be available where compatible SPDs are fitted and registered. We’ll explain replacement indicators and expected service life.
Rules and certificates
Surge-protection work should be assessed against Part P of the Building Regulations and the condition of the existing installation. Fitting an SPD within an existing consumer unit is not automatically notifiable; however, associated work (for example creating a new circuit, replacing the consumer unit, or doing work in a bathroom or other special location) may be notifiable under Building Regulations and therefore requires notification.
We confirm the scope of work before starting and use the appropriate certification route. As NICEIC-registered competent persons we can self-certify notifiable work and make the necessary notification to Building Control; if work is carried out by installers who are not registered competent persons, you will need to arrange and pay for any required Building Control inspection.
Documentation depends on the work carried out: a new circuit or consumer-unit replacement is typically accompanied by an Electrical Installation Certificate (EIC); additions to an existing circuit are usually covered by a Minor Electrical Installation Works Certificate. An Electrical Installation Condition Report (EICR) is an inspection/report on the condition of an existing installation and is not an installation certificate.
Older homes around Medway
In Medway we take a condition-led approach before we specify surge protection for older homes. In the Victorian terraces around Brompton and the town centre — many built in the late 19th century — we still encounter VIR (vulcanised Indian rubber) and other rubber‑insulated cables.
When we attend properties we inspect the consumer unit, earthing and bonding, protective devices, cable condition and available space at the specific Medway address before determining whether an SPD can be installed safely to BS 7671 requirements for that dwelling. We will identify defects in the Medway installation first and advise on proportionate upgrades appropriate to that neighbourhood property.
Where practicable in Medway’s historic properties we aim to retain original fabric, but electrical safety and compliance for that particular building remain decisive.
How long it takes and whether you lose power
Installation time and any interruption depend on the condition and layout of the existing consumer unit. For a modern, accessible unit with spare capacity, we can usually fit and connect an SPD within a short installation timeframe. The work includes safe isolation, checking the earthing and bonding arrangements, fitting suitable overcurrent protection where required, and testing in accordance with BS 7671.
A power interruption is normally necessary because we must safely isolate the consumer unit before altering its internal wiring. We’ll advise you beforehand to save computer work, switch off sensitive equipment and plan around appliances that need continuous supply. Older units, restricted cable space, damaged accessories or inadequate earthing can extend the visit, particularly in Medway’s older properties. Once testing and certification are complete, we restore supply and confirm the SPD’s status indication.