Consumer Unit Upgrade
Walthamstow

Yes, on socket-outlet final circuits rated ≤32A — the current edition of BS 7671 §421.1.7 (September 2022 enforcement). For a Walthamstow HMO around Hoe Street or Forest Road, that means AFDD-RCBOs on every sockets ring including bedroom sockets, kitchen sockets, utility, and any communal-area sockets. Lighting and shower circuits stay on standard RCBO. Where partitions have split a circuit between let areas, we re-segregate before fitting AFDDs. EIC pack formatted for Waltham Forest Council's Selective and Additional licensing format.

Yes — Waltham Forest Council operates both Selective Licensing (covering the whole borough) and Additional Licensing (for larger HMOs). Both schemes accept BS 7671-certified fuse box upgrades when the pack includes the EIC, the schedule of test results, and an in-date EICR. We issue the certificate pack as a single PDF formatted for both scheme submissions. If you're licensing a new property alongside the upgrade, we sequence work so the EIC and EICR are dated within the licence application window.

Depends on the conversion type. Single-household HMOs use one consumer unit. Properly converted-flat HMOs in Walthamstow — common in Edwardian terraces split into 2-3 units around Hoe Street and Markhouse Road — need a separate consumer unit per let unit on a properly segregated supply. Many 1990s-2000s E17 conversions were done with shared supply tails and partial inter-flat segregation; we check at the cutout before quoting and bring in UK Power Networks where a new segregated supply is needed.

Both protect against electric shock and electrical fire. The difference is granularity.

• RCD consumer unit (typically dual-RCD): Two big trip switches, each protecting a group of circuits. If one circuit faults, the whole RCD group trips — you lose the kitchen, lights, and sockets together.
• RCBO consumer unit (one RCBO per circuit): Each circuit has its own combined trip switch. If the kitchen socket faults, only that circuit goes off — the rest stay live.

Why we recommend RCBO for most Walthamstow installs:

• Faster fault diagnosis — you know immediately which circuit is faulty
• Less disruption — one bad iron doesn't kill the whole upstairs lighting
• Better with modern electronics — RCBOs are more sensitive and reliable

When dual-RCD is fine: small flats with simple circuit layouts, properties on a tight budget, short-term landlord-let where cost beats convenience.

Cost difference: typically £150 between dual-RCD (£800) and full RCBO (£950). For most homeowners we recommend the RCBO upgrade — it pays for itself the first time a fault localises rather than killing half the house.

This is the most common scare we see in Walthamstow — the fear-driven upsell to landlords.

Honest answer: plastic fuse boxes fitted before 1 January 2016 are still legal and don't automatically fail an EICR. They were the standard at the time of fitting. They become a problem only when:

• The plastic enclosure shows signs of overheating or burn marks (genuine C2)
• The board has no RCD protection on socket circuits (the fail reason isn't the plastic — it's the missing RCDs)
• The original installation was non-compliant when fitted

Since 1 January 2016, all new consumer units in domestic properties must be made of non-combustible material (typically metal). This is a forward-looking requirement — your existing plastic fuseboard doesn't get retrofitted just because the rules changed for new installs.

What you should worry about: not the colour of the box. Worry about RCD coverage, the age of the wiring, whether the existing fuse box has been properly maintained, and whether your EICR has C1/C2 codes against the consumer unit specifically. If an electrician quotes you for "a metal consumer unit because plastic fails EICR" without that nuance — get a second opinion.

Code-driven. C1 (danger present) must be remediated before re-energising — typically same-day on install. C2 (potentially dangerous) is folded into the fuse box upgrade scope; EICR re-test issued the same day. C3 (improvement recommended) doesn't block Waltham Forest licensing on its own. Typical Walthamstow HMO flow: EICR fail → upgrade booked within 7 days → EIC + re-test EICR on install day → council portal resubmission. Inside 14 days is normal for the Waltham Forest licensing window.

Almost always yes. The new consumer unit is the brain; your existing circuits are the nervous system. We connect to your existing circuit cables — they don't get rewired.

What we test before we commit:

• Insulation resistance on every circuit (must be at or above 1MΩ; healthy 1990s+ installs typically read above 200MΩ)
• Earth continuity — needed for RCD/RCBO to work safely
• Loop impedance — the circuit's ability to clear a fault

If a circuit fails any of these tests, we tell you before we commit. Options:

• Single circuit fix (£100-£300) — repair the fault and continue
• Targeted partial rewire of just that circuit (£300-£600)
• Hold the upgrade and discuss whether a partial or full rewire is now better value

Common Walthamstow scenarios where wiring fails: 1950s-60s rubber-insulated cable in upstairs lighting circuits (Hoe Street and Markhouse Road Victorian terraces), borrowed neutrals between bathroom and ground-floor circuits in Edwardian semis, undersized cables on extension circuits.

We never "just power it back up" with a circuit that failed testing — that's how fires start. Honest tradeoffs only.

Honest answer: the £800 is fixed for the standard scope. Any extras are quoted upfront, never sprung on you mid-install.

What's covered in £800 (no surprise add-ons):

• The new consumer unit / fuse board (quality metal, 6-10 ways)
• RCD protection on socket and lighting circuits
• Re-terminating every existing circuit, properly labelled
• Full insulation, earth, and RCD testing on every circuit
• The Electrical Installation Certificate (EIC)
• Plaster patching with bonding plaster around the install

What CAN add to the price (we tell you before we start, with a fixed quote):

• Circuits failing insulation testing — we'll show you the readings, and you decide: targeted repair (£100-£300 per circuit) or hold the upgrade for a partial rewire conversation
• Incoming supply needs upgrading — rare; happens when adding heavy load like an other high-load equipment or heat pump. We tell you upfront if your supply is borderline
• You opt for the premium tier — £950 (RCBO every circuit + surge protection) or £1,200+ (larger split-load board)

What we never do: discover a "problem" mid-install and charge you for it without your sign-off first. If we find something during testing, work pauses until you've decided. No scope creep.

Walthamstow HMO supplies are predominantly TN-C-S across E17 — some pre-1980 stock on Markhouse and Forest Road still TT with corroded earth rods. Main bonding to gas and water entry required on both. Supplementary bonding in shower rooms unless every metallic service bonds back to the main earthing terminal and the room is on a 30 mA RCD — most E17 HMOs get the supplementary route. Per-flat gas or water entries bonded per-unit. Earth electrode resistance tested and recorded; new TT rod fitted where the existing exceeds 200Ω.

Single-CU Walthamstow HMOs: one 2-3 hour mid-morning isolation window — every let unit off during that window only. Multi-CU HMOs (one per converted flat): sequenced one flat at a time so only one unit is off at any moment. Tenants notified 7 days ahead. Power back same evening — no overnight outages. Temporary kitchen-ring supply available for the lunchtime window if tenants need the kettle and microwave during the main isolation.

Yes — and we set up Walthamstow consumer units for it as standard. What we include:

• Spare 32A way on the fuseboard, labelled and ready for a 7kW or 22kW dedicated high-load circuit installation
• Adequate supply headroom — we check your incoming supply and tell you upfront if a heat pump or other high-load equipment needs a supply upgrade (often the headroom is fine, but worth confirming)
• SPD (surge protection) on the premium tier (£950) — protects every modern electronic in the house from voltage spikes
• Smart-home-ready circuits — neutrals to switch positions if you specify (most period houses don't have these, blocking smart switch installs later)

What gets retrofitted later costs more. Adding extra circuits to an existing fuse box later — chasing walls, lifting floor coverings, isolating the supply again — is more disruptive and costs more than specifying spare ways during the consumer unit upgrade itself, which is marginal cost only.

Tell us at the survey stage what you might add in the next 5 years — future high-load equipment, heat pump, hot tub, garden room, second other high-load equipment, home office. We size the board around your plans, not just your current circuits.

Almost never. Unlike a rewire, a consumer unit replacement is contained to the meter cupboard — usually under the stairs, in a hallway recess, or in a kitchen cupboard. The work stays in that one spot.

What we do during the install:

• Disconnect existing circuits at the old fuse box, label every cable
• Remove the old fuseboard from its mounting point
• Mount the new consumer unit in the same position (same screw holes where possible)
• Re-terminate every circuit into the new board
• Test, certify, and label every circuit on the new unit's chart

What we don't do:

• Chase walls
• Lift floorboards (unless an existing cable is too short to reach the new connection point — rare)
• Disturb skirting, sockets, or switches anywhere else in the house
• Affect any decoration outside the meter cupboard

The only plaster work: if the new board is a different physical size than the old one, we may need to patch a small area of bonding plaster around the mounting position. That's included; finishing coats and any decoration are a decorator's job.

Walthamstow properties with the original fuse box in a tight under-stairs space sometimes need a little extra work to fit a wider modern board — we'll show you the position before we start so you can decide whether to keep it where it is or relocate.