Common Electrical Problems in Sidcup Homes and Flats

Sidcup and the surrounding DA14 and DA15 postcodes have a varied housing stock — from Victorian and Edwardian terraces through post-war semis and maisonettes to modern flats and extended family homes. Each type of property comes with its own set of common electrical issues. This guide covers the problems we find most frequently when working across Sidcup properties, what causes them, and when to call an electrician.

Older Wiring

Properties built before the 1970s may still have older wiring types that have long since been superseded. Rubber-insulated cables from the 1960s and earlier become brittle and crack with age, reducing insulation resistance and creating a risk of short circuits. Aluminium wiring, used in some properties during the 1960s and 70s, expands and contracts at a different rate to copper connections and can loosen over time if connections are not properly maintained.

If your Sidcup property has never been rewired and was built before 1970, an EICR will give you a clear picture of the condition of the wiring and whether action is needed.

Old Fuse Boards

Rewirable fuse boards — where a fuse wire is replaced when a circuit blows — are no longer installed in new properties and present a number of issues in older homes. They offer no RCD protection, which means there is no automatic disconnection in the event of a current leakage to earth (which can cause electrocution). They are also prone to being incorrectly fused, either with the wrong rating of fuse wire or with non-standard materials inserted by previous occupants.

Early plastic consumer units from the 1990s are an improvement on rewirable boards but often use a single RCD to protect half the circuits in the property. If one circuit on that side faults, the RCD trips and takes out all the circuits it protects — including the fridge, freezer or boiler.

Modern RCBO consumer units give each circuit its own individual protection, so a fault on one circuit only trips that circuit. Consumer unit upgrades are one of the most common jobs we carry out across Sidcup properties.

Nuisance RCD Tripping

RCD tripping is one of the most frequent calls we receive from Sidcup homeowners and landlords. The RCD (Residual Current Device) is designed to trip when it detects current leaking to earth — this can be caused by a genuine fault in the fixed wiring, a failing appliance, moisture ingress in an accessory, or a combination of small leakage currents from multiple sources.

The key is to identify whether the tripping is caused by the fixed installation or by a connected appliance. We test each circuit individually to identify which one is causing the trip, then test within that circuit to locate the specific fault. Simply resetting the RCD without diagnosing the cause means the underlying problem remains.

Overloaded Sockets and Circuits

Ring main circuits in older Sidcup properties were designed for the electrical load of their era. Modern homes use significantly more power — more appliances, home office equipment, electric vehicle chargers and more. Overloading a circuit by plugging too many high-draw appliances into a single ring main via adaptors and extension leads is common and creates heat at connection points that can cause damage over time.

The solution is usually to add additional circuits or sockets rather than continuing to extend existing ones. We can advise on the most practical approach for your specific property.

Lighting Faults

Flickering lights, lights that won't come on or lights that trip the circuit when switched on are all common issues across Sidcup properties. The cause can be as straightforward as a failing lamp or as complex as a deteriorating connection in a lighting circuit junction box. Modern LED lighting also presents specific issues — LED drivers can fail, and some LED lamps are not compatible with older dimmer switches.

We diagnose lighting faults on all types of circuit — standard loop-in systems, junction box wiring, two-way switching, LED driver circuits and smart lighting.

Damaged Accessories

Sockets, switches and light fittings that are cracked, discoloured, loose or sparking are a common finding in both owner-occupied and tenanted properties. Damaged accessories should be replaced rather than left in use. A cracked socket face is not just cosmetic — it may expose live components, and a loose connection can arc and cause localised overheating.

For landlords, damaged accessories in tenanted properties are often identified during EICR inspections as C2 observations that must be addressed.

Poor DIY Alterations

Extensions and renovations carried out without proper electrical work, or DIY alterations made by previous occupants, are a frequent finding in Sidcup properties. Common issues include sockets added to ring mains incorrectly (creating spur loops rather than genuine spurs), additional lighting circuits wired without proper earthing, and accessories installed without isolating the supply first, leading to reversed polarity.

These alterations are often not visible to the untrained eye but will be picked up during an EICR. Where we find non-compliant work, we advise on the most practical approach to remediation.

Mixed Old and New Wiring in Extended Homes

Many Sidcup properties have been extended or significantly altered over the years — rear extensions, loft conversions, garage conversions and kitchen renovations all typically involve electrical work. In older properties, this can result in a mix of old and new wiring types, different cable sizes and varying standards of installation — particularly where work was carried out without notification under Part P of the Building Regulations.

This mixed wiring can create difficulties for circuit testing and makes it more important to have a proper EICR carried out to establish the condition of the full installation.

Lack of RCD Protection

Properties wired before 2008 are unlikely to have RCD protection on all socket circuits as standard. The 17th Edition of the Wiring Regulations (2008) introduced requirements for RCD protection on socket circuits used by ordinary persons. Properties wired before this change may not have this protection, which is why it commonly appears as an EICR observation.

Adding RCD protection to existing circuits without a consumer unit upgrade is possible in some cases (using plug-in RCDs or RCD socket outlets), but a consumer unit upgrade to an RCBO board is usually the most practical and comprehensive solution.

When to Call an Electrician

You should contact an electrician in Sidcup if you notice any of the following:

• RCD or MCB tripping repeatedly and not staying on
• Burning smell from sockets, switches or the consumer unit
• Sockets or switches that are warm, discoloured or sparking
• Flickering lights that persist after changing the lamp
• Loss of power to part of the property
• Sockets with reversed polarity (appliances behave unusually)
• An EICR that has returned an Unsatisfactory outcome