A full house rewire or a consumer unit (fuse box) upgrade is one of the most critical safety investments a UK homeowner can make. As our reliance on electrical ...
Whether you are renovating a Victorian terrace or simply updating an ageing 1970s system, modernising your electrics ensures your home meets current BS 7671 safety standards. This guide outlines what to expect regarding costs, timelines, and essential regulations.
What Does the Work Involve?
- Initial Survey: An Electrical Installation Condition Report (EICR) to identify the extent of the work required.
- Safe Isolation: Disconnecting the existing supply and setting up a temporary power source for the duration of the work.
- First Fix: Lifting floorboards and "chasing" (cutting channels) into walls to install new cabling, back boxes, and conduits.
- Consumer Unit Installation: Replacing the old fuse box with a modern unit featuring RCDs (Residual Current Devices) and SPDs (Surge Protection Devices).
- Second Fix: Connecting the new wiring to sockets, switches, light fittings, and hardwired appliances.
- Testing & Certification: Comprehensive circuit testing to ensure everything is safe, followed by the issuance of an Electrical Installation Certificate (EIC).
Typical Costs
| Item | Low £ | High £ | Notes |
|---|---|---|---|
| Consumer Unit Upgrade | £450 | £950 | Includes materials, labour, and certification. |
| 1-Bedroom Flat Rewire | £2,800 | £4,500 | Assuming the property is empty during works. |
| 3-Bedroom Semi-Detached Rewire | £4,500 | £7,500 | Costs rise if the property is occupied. |
| 4+ Bedroom Detached Rewire | £7,500 | £12,000+ | Complex layouts and high-spec fittings. |
| EICR (Initial Inspection) | £150 | £350 | Depending on the size of the property. |
Pricing is primarily driven by the size of the property and whether it is occupied. Working around furniture and residents significantly increases labour time, while high-end decorative sockets and smart home integrations will push material costs toward the higher end of the scale.
How Long Does It Take?
- Consumer Unit Replacement: 4 to 6 hours.
- Partial Rewire (e.g., Kitchen only): 1 to 3 days.
- Full Rewire (Unoccupied Property): 5 to 8 working days.
- Full Rewire (Occupied Property): 10 to 14 working days.
DIY or Professional?
House rewiring is not a DIY project. In England and Wales, major electrical work is "notifiable" under Part P of the Building Regulations, meaning it must be carried out by a competent person who can self-certify the work.
Attempting to rewire a property yourself is not only extremely dangerous but can also invalidate your home insurance and make it impossible to sell the property in the future without a valid Electrical Installation Certificate.
Choosing the Right Tradesperson
- Check Registrations: Ensure they are registered with a government-approved scheme such as NICEIC, NAPIT, or STROMA.
- Insurance: Verify they hold valid Public Liability Insurance (minimum £2 million is standard).
- References: Ask to see recent examples of rewiring projects in similar property types.
- Detailed Quotes: Ensure the quote specifies if "making good" (plastering over chases) is included, as many electricians leave this to a separate plasterer.
Questions to ask:
- "Will you handle the Building Control notification on my behalf?"
- "How many 'points' (sockets/lights) are included in this quote?"
- "Will my power be off overnight, or will you set up a temporary supply?"
UK Regulations
- BS 7671 (18th Edition): The national standard for electrical installations. Your rewire must comply with the latest amendment.
- Part P (Building Regulations): Requires that most electrical work in dwellings is designed and installed to protect people from fire and electric shocks.
- Certification: You must receive an Electrical Installation Certificate (EIC) and a Building Regulations Compliance Certificate once the work is complete.
Common Problems
- Asbestos: Older properties may have asbestos in textured ceiling coatings (Artex) or floor tiles, which must be professionally tested before chasing or drilling.
- Floorboard Damage: Victorian or Edwardian tongue-and-groove boards are prone to splintering when lifted; factor in potential repairs.
- Hidden Junction Boxes: Old, inaccessible junction boxes under floors can make "partial" rewires difficult and may necessitate a full rewire.
- Decorative Mess: Rewiring is invasive. Unless "surface mounting" (which looks untidy), expect significant dust and the need for full redecoration.
Frequently Asked Questions
Do I have to move out during a full rewire?
You don't have to, but it is highly recommended. The process is extremely dusty, noisy, and involves lifting floorboards in every room. If you stay, the electrician will have to reinstate power every evening, which adds significant labour costs.
How often should a house be rewired?
Most electrical installations have a lifespan of 25 to 30 years. If your home hasn't been touched since the 1990s, or if you still have a wooden-backed fuse box, it is time for an inspection.
What is an RCD and why do I need one?
A Residual Current Device (RCD) is a life-saving switch that trips the circuit in milliseconds if it detects a leak to earth (e.g., if you cut through a cable with a hedge trimmer). Modern consumer units use RCBOs to ensure that a fault in one circuit doesn't lose power to the whole house.
Does a rewire include plastering?
Usually, no. Most electricians will "patch" with a base coat of plaster (bonding), but few include a professional finish. Always clarify this in your quote to avoid unexpected costs for a plasterer.
Can I just replace the fuse box instead of a full rewire?
Yes, but only if the existing wiring is in good condition. An electrician will perform an EICR first; if the old wires are crumbling or lack an earth, a new consumer unit will simply keep tripping, making a rewire necessary.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
