Most electrical demand in St John's Wood is not about failure. It is about load. The houses here have grown — a basement converted, a loft turned into bedrooms, a kitchen rebuilt with induction and three ovens, a garden room added, a car charger wanted, a gate motor, a pool or plant enclosure, lighting through the garden, cameras on the boundary, plus air conditioning and a media system that expects clean, uninterrupted power. Very little of that existed when the house was wired. The consumer unit and the incoming supply are frequently the oldest and least-considered part of the property, quietly carrying a house that has doubled its electrical appetite.
Start at the supply, not at the socket
When someone in NW8 asks for "a couple of extra circuits", the honest first question is whether the head, the meter tails and the main protective bonding can support what is already connected, let alone what is being added. This is not upselling — it is the only sequence that works. Adding a 32A charger and a garden supply to a board that is already near its limit does not produce a slightly stretched installation. It produces nuisance tripping, hot terminations, and a rewire in two years that could have been planned once.
So a proper first visit to a large house here looks at the intake position, the main earthing arrangement, the state of the bonding to gas and water, what type of board is fitted, whether the circuits on it are actually the circuits the labels claim, and how much headroom is genuinely left. Half the labelling on boards in this stock is fiction, written for an installation that has since been altered three times. Establishing the real picture is what allows a fixed price on everything that follows.
The 1930s blocks: conduit, cupboards, and no spare route
The mansion blocks are a different animal. Many are steel-framed with solid floors and walls, and the original wiring ran in steel conduit cast or chased into the structure. That has two consequences. The good one is that the conduit is often still serviceable and can be rewired through, which is far less destructive than it sounds. The bad one is that if you want a circuit where no conduit goes, you cannot simply chase a channel across a solid structural wall and make good — you are into surface containment, dropped ceilings, or a route that goes the long way round. In these blocks, the design question is not "where do I want the socket" but "what route can I actually get there".
Flat boards in the older blocks are frequently sited in a hall cupboard, behind a coat rail, next to the meter, or in a communal cupboard on the landing. Where the meter and the board are split across the flat boundary, any work touching the communal side needs the managing agent involved. As a general rule, treat anything outside your front door as not yours to alter without asking.
Garden supplies, outbuildings and EV — the NW8 speciality
Because so many properties here have real gardens, a large share of the electrical work is outdoors, and outdoor work is where corners get cut most often. A supply to a garden room, a studio, a garage, an irrigation controller, gate motors or lighting is a sub-installation, not an extension lead in a trench. Done properly it means an armoured cable at a sensible depth with warning tape above it, a correctly sized circuit that accounts for the run length, a means of isolation at both ends, an appropriate board in the outbuilding if it has more than one circuit, and equipment with a weather rating that matches where it actually sits — not the rating the box claimed on a dry day in a showroom.
The two failures we see most in garden electrics are undersized cable over a long run, which produces voltage drop and lights that dim when the kettle goes on in the studio, and enclosures that are IP-rated for splashing but installed where water pools. Both are avoidable at design stage and expensive afterwards, because the cable is under the lawn.
Car charging follows the same logic and adds one more consideration: the supply. Whether a charger can be installed at full output, at a limited output, or only with load management depends on what the property's main supply can carry alongside everything else. That is a calculation, not a guess, and it should happen before the charger is bought. If an upgrade to the incoming supply is needed, that involves the network operator and their timescales, which are outside any contractor's control — so it is worth finding out early rather than the week you take delivery of the car.
Conservation area and listed constraints
St John's Wood carries conservation area designation, which brings additional planning control over what appears on the outside of a building. That reaches electrical work more often than people expect: external lighting on a front elevation, a car charger position on a visible wall, cameras, a gate installation, cabling run externally rather than internally. If a building is listed, listed building consent is typically required for works affecting its special character, and that can include chasing into historic fabric or fixing to a principal elevation. These rules vary by property and by exactly what is proposed, so confirm the position with the council and, in a leasehold flat, with your freeholder — do not assume that because a neighbour has one, you may have one.
What the building imposes
In a porter-managed block, an electrical job is shaped by the building before it is shaped by the wiring:
- Contractors are booked in. Expect to log in with the porter and to work within the block's permitted hours, with noisy work — chasing, drilling, lifting floors — usually confined to a narrower window than general work.
- Lift and common parts get protected. Everything arrives and leaves through shared space. Protection is not a courtesy here, it is normally a condition of access.
- Power off can reach beyond your flat. If the isolation point is in a communal cupboard, it needs arranging with the porter or agent rather than flicking a switch.
- Dust discipline matters. Chasing solid walls in a block is dusty work in a building where the corridor is somebody's front hall. Containment and daily clearance are part of the job.
- Consent is likely for alterations. Most leases require freeholder or managing-agent consent — often a licence to alter — for anything beyond like-for-like work. Requirements differ between leases, and freeholds in this area sit with a range of owners including large estates, so read your lease rather than relying on a rule of thumb.
The rules that apply either way
Electrical work in dwellings falls under Building Regulations Part P, and installations are designed and tested to BS 7671. Certain work is notifiable, which means it must be certified and notified to building control — usually through a registered competent person scheme, which is the simple route. That certificate is not paperwork for its own sake: it is what a buyer's solicitor, a freeholder, or an insurer will ask for later, and its absence turns a completed job into a problem at the point of sale.
If a property in NW8 is let, two further duties apply. An EICR is required at least every five years for rented homes in England under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020, and any remedial work it identifies has to be carried out. Where there is gas, an annual gas safety check applies under the Gas Safety (Installation and Use) Regulations 1998. Landlords with a large house here should expect the inspection itself to be longer than a flat's, simply because there is more installation — garden circuits, outbuildings, pool or plant supplies and basement pumps all form part of it.
How we run it
Electrical work starts from £80, published and set. Small jobs are priced before we arrive. Anything larger — a board change, a rewire, garden and outbuilding supplies, a charger, an EICR followed by remedials — gets surveyed first, then a fixed quote covering scope, certification and making good, so there is no argument later about whether plaster repair was included.
Sequence matters on bigger works. Supply and board first, then circuits, then the second fix and the trades that depend on it. In a block, access, hours and isolation are agreed with the porter before the first day rather than negotiated on it. You get one point of contact who handles that, and a tidy site each evening.
Most jobs here overlap. A new bathroom needs certified electrics in the right zones — see bathroom refurbishment in St John's Wood. Pumps, cylinders and immersions sit across both trades, which is why our St John's Wood plumbers and electricians work off one scope. Broader detail is on the electrical services page, other NW8 work on the St John's Wood area page, and larger programmes on refurbishment. If you manage lettings and need EICRs and remedials handled without chasing, see working with us as an agent, or just send us the details.