Rewiring an old house

Alan Tierney explains how to update the electrics on a period property – without compromising the character and fabric of the building

If a period property hasn’t been updated in the last 30 years, it probably needs rewiring to meet modern safety standards. Pictured are Davey Lighting York wall lights, £239 each from Original BTC (www.originalbtc.com)

Rewiring can be disruptive to the fabric and finishes of a property – but if you’re dealing with a faulty or inadequate installation, it will be a sound investment. After all, poor electrics are a common cause of fires in historic homes.

If possible, it’s well worth having the existing wiring inspected before you buy. This should give you a sense of what work might be required and, importantly, how much it’s likely to cost – which may help you assess whether a project is financially viable.

Is it always necessary?

As a rule, if a property hasn’t been rewired since the late 1980s then it’s likely at least part of the infrastructure will need to be upgraded to ensure it’s safe (particularly in terms of fire risk) and complies with current standards. The consumer unit is often a tell-tale sign: if there is an old-fashioned fuse box, the chances are that rewiring will be necessary.

QUICK GUIDE: THE REGULATIONS

Electrical works are covered by Part P of the Building Regulations. This sets out minimum standards for new work – as well as under what circumstances you will need to upgrade existing installations. Basically, any alterations or additions to the electrical installation constitute new work and must therefore conform to Part P.

If you’re planning a major renovation or the current setup is unsafe, then Part P will require you to rewire at least part, if not all, of the property – including the consumer unit. This work will have to comply with the regulations and be certified on completion. The regs may also demand that the existing wiring is improved to ensure that is able to carry any additional loads, as well as make certain that it is earthed to current standards and that earth bonding is satisfactory.