How Much Does a Fuse Box / Consumer Unit Replacement Cost in North London?
Honest, up-to-date pricing for fuse box replacement (also called consumer unit replacement) across Edmonton, Enfield, Muswell Hill, Palmers Green, Southgate and the wider N London area. Real prices, no hidden costs, RCBO + SPD as standard.
A typical fuse box (consumer unit) replacement in North London costs £800–£1,200.
A fuse box replacement (consumer unit replacement) for 1-bed flats starts at £800 (5–7 way RCBO or 10-way Dual RCD board with SPD). 2-3 bed semis are typically £950 (10-way Full RCBO + SPD). Larger 4+ bed homes and period properties range from £1,200–£1,500 for 16-20 way Full RCBO boards. All prices include the new board, surge protection (SPD), full circuit-by-circuit testing, NICEIC certification, and Building Control notification under Part P.
The biggest factors that move price: property size (more circuits = larger board = next tier), HMO licensing (mandatory AFDDs at £85–£120 per socket circuit), and scope add-ons (bonding upgrade, EICR-failed circuit repair).
Fuse Box / Consumer Unit Replacement Pricing by Property Size
The biggest cost driver is property size — more circuits need a larger board. These ranges reflect typical North London housing stock as of 3 May 2026 with all prices including SPD as standard.
| Property Type | Typical Fuse Box Replacement | Time on Site |
|---|---|---|
| 1-bed flat (purpose-built or converted) | £800 | 4 – 6 hrs |
| 2-bed terrace / flat | £900 | 6 – 8 hrs |
| 3-bed semi-detached (typical N London) | £950 | 6 – 8 hrs |
| 4-5 bed detached / large period | £1,200 – £1,500 | 1 day |
| HMO (any size — AFDDs on socket circuits) | £1,500 – £2,500+ | 1 – 2 days |
All prices include the new RCBO board, Type 2 SPD (surge protection), full circuit-by-circuit testing, NICEIC EIC certificate, Part P Building Control notification, and a 12-month workmanship guarantee.
Pricing by Board Specification
Not every property needs the same board spec. The £150 difference between Dual RCD and Full RCBO matters when a single fault decides whether you lose one circuit or three.
| Board Specification | Typical Cost | What’s Included |
|---|---|---|
| Dual RCD board (entry-level, like-for-like) | £800 | Up to 10-way Dual RCD board, Type 2 SPD, full circuit testing, EIC certificate |
| Full RCBO + SPD (modern standard, recommended) | £950 | 10-12 way Full RCBO board, Type 2 SPD, RCBO per circuit, EIC certificate |
| Full RCBO + SPD (large) | £1,200 | 12-16 way Full RCBO + SPD, RCBO per circuit, suitable for larger semis |
| Full RCBO + SPD (period properties) | £1,400 – £1,500 | 18-20 way Full RCBO + SPD, ample spare ways, suitable for period homes |
| HMO-spec board (RCBO + SPD + AFDDs) | £1,500 – £2,500+ | 18-way+ RCBO + SPD + AFDDs on socket circuits, full HMO landlord cert pack |
Pricing by Scope Add-ons
Most fuse box replacements (around half of jobs) are clean like-for-like swaps with no extras. The cost adders below apply only when a specific scope item is needed — quoted upfront, never sprung mid-job.
| Scope Add-on | Cost Adder | When It Applies |
|---|---|---|
| Board only swap (like-for-like — ~50% of jobs) | Standard tier price | Existing main earthing + bonding adequate. Re-terminate all circuits, full testing, EIC. |
| + Main bonding upgrade (10mm to gas/water) | +£100 – £200 | Required if existing bonding is missing or undersized. Common on pre-1990 properties. |
| + Per-circuit fault repair (EICR-failed) | +£100 – £300 per | Failed insulation testing identified during pre-install survey. We show readings, you decide. |
| + AFDD per socket circuit (HMO licensing) | +£85 – £120 per | HMO licensing requires AFDDs on bedroom socket circuits per current landlord regs. |
| + EV-ready spare way (during install only) | marginal cost | Adding a 32A spare way during the upgrade is near-free. Retrofitting later: £400–£600. |
Standard vs Premium vs Large Board
Most homeowners ask which tier to choose. Here’s the practical difference between the three options — and which one fits which property.
What Actually Affects Cost
Beyond the headline tier price, these are the property-specific variables that shift a quote up or down. Most quote conversations come down to these factors.
Existing board age
Pre-2008 fuse-wire boards take longer to remove than 2015 dual-RCDs. Adds time, not material cost.
Circuit count
More circuits = next tier up. 6 circuits → 10-way; 10 circuits → 12-16 way; 14+ circuits → 18-way+.
HMO licensing requirement
Bedroom socket circuits in HMOs need AFDDs at £85–£120 each per circuit per landlord regs.
Main bonding age
Old or missing 10mm bonding to gas/water adds £100–£200 to bring up to current spec.
EV / heat pump prep
Spare 32A way during the install adds little. Retrofitting later costs £400–£600 due to wall chasing.
Period property cable runs
Long cable runs from the board to existing circuits add labour but not materials. Common in Victorian/Edwardian semis.
EICR-driven scope
Failed circuits identified during testing add £100–£300 per circuit for repair before re-certification.
Real North London Fuse Box / Consumer Unit Case Studies
Anonymised real jobs from the past 12 months. Property type, scope, final price, time taken — exactly as they happened. No marketing inflation; no cherry-picked best cases.
10-way Full RCBO + SPD upgrade pre-tenancy
What we found: Pre-2008 split-load fuse board with cracked breaker housings. Failed EICR — borrowed neutrals on the lighting circuit, missing 10mm bonding to gas. Existing main earth tail intact and adequate.
What we did: Replaced with a 10-way Full RCBO board + Type 2 SPD. Re-terminated and tested every circuit. Repaired the borrowed-neutral fault on the lighting circuit. Upgraded main bonding to 10mm on gas (water bond was already adequate). Issued EIC + EICR pass. Property re-let within a week.
Nuisance-tripping board → 10-way Full RCBO + SPD
What we found: 2018-spec dual-RCD board nuisance-tripping the shared kitchen/bathroom RCD every time the dishwasher and shower drew current together. Customer wanted modern protection without major scope creep.
What we did: Replaced with a 10-way Full RCBO board + Type 2 SPD. Each circuit now on its own RCBO — no more shared trip events. Identified a spare 32A way and labelled it ‘EV future’ for when they go electric on next car cycle. Same-day finish, family had power back by 5pm.
18-way Full RCBO + SPD with EV-ready spare
What we found: 1990s split-load board with no SPD and a borrowed neutral on the upstairs lighting circuit. Customer had a Tesla on order and wanted the EV charger circuit ready before delivery in 6 weeks.
What we did: Replaced with an 18-way Full RCBO + Type 2 SPD board. Repaired the borrowed-neutral fault. Installed a dedicated 32A way labelled and tested for the upcoming EV charger install. Issued EIC and a separate readiness note for the EV installer. Customer scheduled the charger install for 4 weeks after our completion.
All consumer unit installations include a full RCD/insulation/earth/continuity test pack and Electrical Installation Certificate (EIC). Photos available on request.
Why Fuse Box / Consumer Unit Replacement Prices Vary So Much
If you’ve collected 3 quotes for the same fuse box replacement and they range from £450 to £1,500, you’re not being fleeced — you’re seeing the difference between fair and underbidding. Here’s why prices spread:
- Cheap quotes that skip SPD: some installers fit a basic dual-RCD board without surge protection — cheaper upfront, but every modern electronic in your home is vulnerable to grid voltage spikes.
- Cheap quotes that skip Part P: Part P Building Control notification is legally required and adds ~£100 to every quote. Quotes that skip this leave you with unsigned work and resale issues.
- Cheap quotes that skip RCBO: a dual-RCD board groups circuits — when one trips, several go down. RCBO (one breaker per circuit) costs more but isolates faults to a single circuit. Both are 18th edition compliant; the experience is very different.
- Cheap quotes that skip testing: a proper consumer unit upgrade includes full insulation, earth, RCD/RCBO, and continuity testing on every circuit. Some installers skip steps — the new board is fitted but you don’t know which existing circuits passed.
- Fixed price vs day rate: the cheapest quotes are usually day-rate based, where the installer races the clock to protect their margin. We quote fixed prices for the outcome: scope is agreed upfront, the price doesn’t change, and we’re accountable to the finished result regardless of how long it takes us.
Our approach: we quote on a fixed-price basis after a free site survey. The price you see in the quote is the price you pay. Scope changes only happen on your written agreement, never as a surprise mid-job.
Cost FAQ
Direct answers to the cost questions we get most often during free site surveys.
How much does a fuse box (consumer unit) replacement cost in North London?
A typical fuse box (consumer unit) replacement in North London costs £800 – £1,200, including the new RCBO board, surge protection (SPD), all materials, labour, NICEIC certification, and Building Control notification under Part P.
1-bed flats start at £800 (5–7 way RCBO or 10-way Dual RCD). 2–3 bed semis are typically £950 (10-way Full RCBO + SPD). 4+ bed and large period properties run £1,200–£1,500 for 16–20 way boards. HMOs cost more (£1,500–£2,500+) because of mandatory AFDDs on socket circuits.
Why are some quotes £450 and others £1,500 for the same job?
The cheap quotes typically skip something legally required: Part P Building Control notification, full RCD/insulation/earth testing, or RCBO specification. Some installers use undersized cables, omit SPD, or quote for an RCD-only board when the property needs RCBO protection.
Our pricing always includes a Type 2 SPD as standard, RCBO per circuit (on the £950 tier and up), full circuit-by-circuit testing, EIC certificate, and Part P notification. If a quote doesn’t itemise these, it will grow.
Do I need a Full RCBO board, or is a Dual RCD board good enough?
Both are 18th-edition compliant. The difference is what happens when a fault occurs:
• Dual RCD (£800 tier): one fault trips multiple circuits at once. If a kettle fault trips the kitchen RCD, your fridge and freezer go off too.
• Full RCBO (£950 tier): each circuit has its own RCBO. A kettle fault only trips the kitchen ring — your fridge keeps running.
For modern homes with lots of appliances, RCBO is worth the £150 difference. For 1-bed flats or simple budgets, Dual RCD is fine.
What’s the difference between RCD, RCBO, and SPD?
• RCD (Residual Current Device) detects earth faults — protects against electric shock. Required since 2008.
• RCBO (Residual Current Breaker with Overcurrent) is an RCD plus a circuit breaker — protects against earth faults AND short circuits / overload. One RCBO per circuit means only the affected circuit trips.
• SPD (Surge Protective Device) absorbs voltage spikes from the grid — protects every electronic in your home (boiler controls, smart-home gear, TVs, computers). Type 2 SPD is now standard on every board we install.
Will a fuse box upgrade make my home safer?
Yes — significantly, especially if your existing board is older than 2008.
Pre-2008 boards typically have no RCD protection on socket circuits. Today’s regulations require RCD protection on every cable buried in a wall and every socket — a modern RCBO board protects you from electric shock if a cable is damaged (e.g. picture nail through hidden cable) or an appliance develops an earth fault.
The SPD also protects against grid voltage spikes — common in older N London streets where overhead supply is being upgraded.
Can I get this done the same day, or does it take longer?
For 1-bed flats and 2–3 bed semis, same-day install is standard. We’re typically on site for 4–8 hours and you have full power back by early evening.
For 4–5 bed detached homes and large period properties, expect 1 day. For HMOs requiring AFDDs and full landlord cert pack, allow 1–2 days.
If we discover something unexpected during testing (failed circuit, damaged tail), we’d stop, tell you, and agree the next steps — never a surprise on the invoice.
Will my power be off all day during the swap?
Power is off for the bulk of the install — typically 3–6 hours for the active swap and testing phase. We isolate at the main cutout, swap the board, re-terminate every circuit, then test every circuit before re-energising.
For occupied properties we plan around your day — start early, leave power on as long as possible during prep, work efficiently during the isolated phase, and re-energise as soon as testing passes. Fridges and freezers stay safe during a 4–6 hour window. For longer jobs (1–2 day HMO installs) we restore power overnight between days.
Does the price include making good walls and decoration?
Our price includes bonding plaster patching at any chases — the wall is left ready for a decorator to skim and finish. We do not quote for skim, paint, wallpaper, or matching original finishes — that’s a decorator’s job.
Most fuse box swaps don’t require chasing at all (existing cables are already in the wall — we just re-terminate at the new board). The board itself sits in the same location as the old one, so no decoration impact in 90% of cases.
What’s NOT included in the fuse box replacement price?
Our fuse box replacement price covers the new board, all materials, labour, full testing, certification, and bonding plaster patching. Not included:
• Per-circuit fault repair if EICR testing identifies failed circuits (£100–£300 per circuit, quoted upfront before we proceed)
• AFDDs for HMO socket circuits (£85–£120 per AFDD — required only for HMOs)
• Skim plastering and decoration (decorator’s job; rare anyway)
• EV charger installation (the spare way is included; the charger and cable run is a separate quote)
• Heat pump connection (similar to EV — we leave a labelled spare way; the heat pump installer connects)
Explore Fuse Box / Consumer Unit Replacement by Area
All 13 North London areas covered, plus related upgrade and diagnostic services. Each area page has local property type guidance and example pricing.
Ready to get a fixed-price quote?
Free site survey, fixed quote within 48 hours, no obligation. I’m Rudi — I’ll come out, look at your existing board, and tell you exactly what it’ll cost.