Electrics and Electrical Work in London Home Renovations in 2025: Part P, Testing, EV Charging, and Costs

Part P Building Regulations, EICR electrical testing, consumer unit upgrades, and the first and second fix electrical sequence for London home renovations in 2025: PART P BUILDING REGULATIONS — WHAT GOVERNS ELECTRICAL WORK IN LONDON HOMES: PART P of Schedule 1 to the Building Regulations 2010 (England and Wales) requires that all DOMESTIC ELECTRICAL WORK is designed and installed to be safe and that certain types of work are NOTIFIED to the local authority (Building Control); WHAT IS NOTIFIABLE UNDER PART P: the following domestic electrical work is NOTIFIABLE (it must be either self-certified by a PART P REGISTERED COMPETENT PERSON or notified to and inspected by Building Control): CONSUMER UNIT REPLACEMENT OR UPGRADE; NEW CIRCUITS (any new circuit from the consumer unit to wherever it terminates); REWIRING (replacement of all fixed wiring throughout a property — a full rewire is notifiable); ADDITIONS TO CIRCUITS WITHIN KITCHENS OR BATHROOMS (Part P specifically treats kitchens, bathrooms, and areas with a shower as SPECIAL LOCATIONS where higher risk applies — even adding a socket in a kitchen or a new bathroom light fitting is notifiable); ADDING A CIRCUIT OR OUTLET IN A SPECIAL LOCATION (within 0.6m of sinks, WCs, showers, baths, or where there is a risk of contact with earthed metalwork); WHAT IS NOT NOTIFIABLE (NON-NOTIFIABLE WORK): adding a socket or switch on an existing circuit OUTSIDE a kitchen or bathroom; replacing a socket, switch, or light fitting like-for-like (no new circuit required); replacing a damaged or faulty cable in the SAME LOCATION as the existing cable (not involving the consumer unit); IMPORTANT NOTE: even non-notifiable work MUST still comply with BS 7671 WIRING REGULATIONS (18th EDITION — the current edition as of 2025) — the difference is not in the standard that applies (it always does) but in whether notification to Building Control is required; BS 7671 18TH EDITION (THE IET WIRING REGULATIONS): the technical standard that governs all UK electrical installation; updated regularly by the IET (Institution of Engineering and Technology); the AMENDMENT 2 (2022) to BS 7671 18th Edition introduced significant changes including UPDATED REQUIREMENTS FOR RCBO PROTECTION (increased requirement for RESIDUAL CURRENT DEVICE protection), updated ARC FAULT DETECTION requirements (AFDDs — Arc Fault Detection Devices — now recommended in dwelling bedrooms and living areas), and updates to ELECTRIC VEHICLE CHARGE POINT WIRING; REGISTERED COMPETENT PERSONS SCHEMES (THE ROUTE TO SELF-CERTIFICATION — THE STANDARD ROUTE FOR ALL DOMESTIC ELECTRICAL WORK IN LONDON): the preferred route for compliance with Part P is to use a contractor who is REGISTERED with a COMPETENT PERSONS SCHEME (the most common is NICEIC, NAPIT, ELECSA — these are government-authorised schemes for self-certification of electrical work); a NICEIC-REGISTERED ELECTRICIAN can self-certify the work and issue an ELECTRICAL INSTALLATION CERTIFICATE (EIC) or a MINOR WORKS CERTIFICATE (MWC for small additions to existing circuits) without the need for Building Control notification; the EIC is the key document confirming compliance and must be kept — it is required when the property is sold or let; THE ALTERNATIVE — BUILDING CONTROL ROUTE: if the electrician is NOT registered with a competent persons scheme, the electrical work must be NOTIFIED TO BUILDING CONTROL before it starts; BC will inspect and certify — this is SLOWER and more EXPENSIVE than the competent persons self-certification route; PRACTICALLY SPEAKING: all professional electricians doing domestic work in London in 2025 should be registered with NICEIC, NAPIT, or ELECSA; verify this at the USELF REGISTER CHECK at electricalcompetentperson.co.uk before engaging an electrician; EICR — ELECTRICAL INSTALLATION CONDITION REPORT (THE PRE-RENOVATION ASSESSMENT): WHAT IS AN EICR: a formal assessment of the EXISTING ELECTRICAL INSTALLATION in the property; a registered electrician inspects and tests the fixed wiring, consumer unit, sockets, switches, earthing, and bonding throughout the property and records the condition of each element against the BS 7671 standard; the EICR will contain: C1 CODES (immediate danger — immediate remedial action required); C2 CODES (potential danger — remedial action required); C3 CODES (improvement recommended — not a safety issue but below best practice); FI CODES (further investigation required); a C1 or C2 on an EICR means the installation is UNSATISFACTORY and the property cannot be let until it is resolved (legal obligation on landlords under the ELECTRICAL SAFETY STANDARDS IN THE PRIVATE RENTED SECTOR (ENGLAND) REGULATIONS 2020); WHEN TO GET AN EICR BEFORE A LONDON RENOVATION: BEFORE a rewire or consumer unit upgrade, the EICR tells you the EXISTING CONDITION and helps the electrician specify the scope of the upgrade; for a LONDON VICTORIAN TERRACED HOUSE (many have original or partially original 1960s wiring): the EICR will often reveal: unsleeved earth conductors (old green insulation, not green-and-yellow); rubber or lead-sheathed cables at the end of their service life; outdated consumer units (old rewirable fuse boards without RCDs); INADEQUATE EARTHING (the earthing may have been via the old lead water main — since replaced with plastic — and the earth bonding may not now be complete); absence of residual current device protection; the EICR scope typically costs: approximately £200-£600 for a 3-bedroom terraced house in London depending on the number of circuits; CONSUMER UNIT UPGRADE: almost all London Victorian terraced houses that are being renovated should have the CONSUMER UNIT (FUSE BOARD / DISTRIBUTION BOARD) UPGRADED as part of the renovation; the current requirements under BS 7671 18th Edition Amendment 2 mean that a MODERN CONSUMER UNIT should have: A MAIN SWITCH (ISOLATOR) to disconnect all circuits; RCBO (RESIDUAL CURRENT BREAKER WITH OVER-CURRENT PROTECTION) ON EACH CIRCUIT: an RCBO combines the overload and short-circuit protection of an MCB (miniature circuit breaker) with the 30mA earth leakage protection of an RCD (residual current device) in a single unit; RCBO per circuit means one circuit tripping does not knock out an entire bank of circuits; METAL CONSUMER UNIT ENCLOSURE (required by BS 7671 since 2016 for all new installations to reduce the risk of fire spreading from an internal electrical fault — replacing old plastic consumer units with metal-enclosed units is the required standard); AFDD (ARC FAULT DETECTION DEVICE) PROTECTION: now recommended (and increasingly required) for bedroom and living area circuits; AFDDs detect arc faults (the early warning sign of cable damage that can cause fire) at the consumer unit; SIZE AND CAPACITY OF THE CONSUMER UNIT: a typical 3-bed London terrace after a renovation will typically have: lighting circuits (at least 2 — upstairs and downstairs); 2.5mm² ring main socket circuits (typically 2 — one per floor, or one per floor plus a kitchen circuit); kitchen dedicated circuits (including a cooker circuit at 6-10mm² twin-and-earth, a dishwasher spur, a fridge spur); bathroom extractor fan circuit; immersion heater circuit (if applicable); EV charge point circuit; a DOUBLE-POLE ISOLATOR for the EV charger; utility room or garden outlet; ELECTRICAL WORK SEQUENCE IN A LONDON RENOVATION: FIRST FIX ELECTRICAL WORK (BEFORE PLASTERING): the FIRST FIX stage involves: installing back-boxes for sockets and switches (set into the stud wall or surface-mounted on masonry); chasing CABLE ROUTES into solid masonry walls (or running inside stud walls before boarding); installing CONSUMER UNIT POSITION (the new consumer unit is positioned in the cupboard under the stairs or the utility room — the cable run to all circuits starts here); running CABLE (typically 2.5mm² TWIN-AND-EARTH for ring main sockets; 1.5mm² for lighting; 6mm² or 10mm² for cooker; 6mm² or 10mm² for EV charger dedicated circuit) through the fabric of the building BEFORE PLASTERBOARD GOES UP or walls are skimmed; IMPORTANT SEQUENCING RULE: all cable runs must be complete and correctly positioned before plastering starts — repositioning a socket or light point after plastering requires hacking out and re-chasing (time and cost); use a DRAWING or SCHEDULE OF SOCKET AND LIGHT POSITIONS before first fix to minimise repositioning; SECOND FIX ELECTRICAL WORK (AFTER PLASTERING AND DECORATING — BEFORE FLOORING): the SECOND FIX stage involves: FITTING AND WIRING SOCKETS AND SWITCHES (the plates are fitted to the back-boxes, the cables connected); FITTING PENDANT LIGHT FITTINGS, DOWNLIGHTS, OR WALL LIGHTS; connecting and commissioning the CONSUMER UNIT; TESTING AND CERTIFICATION: at the end of second fix, the electrician carries out TESTING OF ALL CIRCUITS (insulation resistance test; earth continuity test; polarity check; RCD test) and issues the ELECTRICAL INSTALLATION CERTIFICATE.

EV charge point installation, smart home electrical requirements, and realistic electrical costs for London home renovations in 2025: EV CHARGE POINT INSTALLATION AT LONDON RESIDENTIAL PROPERTIES: EV CHARGE POINT PENETRATION IN LONDON IS GROWING RAPIDLY: with the UK government banning the sale of new petrol and diesel cars from 2030, and with EV take-up already significant in London, installing a home EV charge point during a renovation is increasingly treated as a STANDARD FEATURE rather than an optional extra; TYPES OF EV CHARGE POINT: SLOW CHARGER (3-PIN HOUSEHOLD SOCKET): the cheapest option (no dedicated installation beyond a standard 13A socket) but the SLOWEST (approximately 8-12 miles of range per hour of charging from a standard 13A supply — this is inadequate for most EV drivers as a sole charging solution); NOT RECOMMENDED for day-to-day EV charging use; FAST CHARGE POINT — 7kW SINGLE-PHASE (THE UK HOME STANDARD): the 7kW DEDICATED CHARGE POINT is the STANDARD HOME EV CHARGER in the UK (it operates on a SINGLE-PHASE 32A circuit at 240V = approximately 7kW output — approximately 25-30 miles of range per hour of charging); suitable for most electric cars; a full overnight charge can provide 100-150 miles of range; the 7kW charge point is the STANDARD RECOMMENDATION for a London property renovation; POPULAR BRANDS IN LONDON 2025: OHME (smart charge point with OCTOPUS AGILE or TIME-OF-USE TARIFF integration — the smart tariff integration is the main selling point in London where time-of-use tariffs like Octopus Go (5p/kWh overnight) can dramatically reduce charging costs vs day rates); ZAPPI (MYENERGI — integrates with solar PV if installed); HYPERVOLT; ANDERSEN A2 (aesthetically designed — popular in London premium renovations); EASEE ONE; FAST CHARGE POINT — 22kW THREE-PHASE: requires a THREE-PHASE SUPPLY (most London residential properties are SINGLE-PHASE — the 22kW charger is rarely appropriate for domestic London properties unless the property has been specifically upgraded to three-phase supply); EV CHARGE POINT BUILDING REGULATIONS AND PLANNING — LONDON SPECIFIC: PART S OF BUILDING REGULATIONS (INFRASTRUCTURE FOR THE CHARGING OF ELECTRIC VEHICLES): Part S requires that where RESIDENTIAL BUILDINGS are being renovated with PLANNING PERMISSION and the renovation includes WORK ON THE BUILDING'S FIXED ELECTRICAL INFRASTRUCTURE, and the building has ASSOCIATED PARKING, the renovation must include EV CHARGE POINT INFRASTRUCTURE (at minimum, the wiring and consumer unit capacity to support a future charge point, if not the charge point itself); PRACTICALLY SPEAKING: any significant renovation on a London property with off-street parking (common in some outer London boroughs) should now include EV charge point provision; PLANNING PERMISSION (IN LONDON, AN EV CHARGE POINT AT THE FRONT OF A PROPERTY VISIBLE FROM THE HIGHWAY MAY REQUIRE PLANNING PERMISSION in some conservation areas — check with the LPA's pre-application team; charge points installed in rear gardens or side walls not visible from the highway are typically PD); OFFICE FOR ZERO EMISSION VEHICLES (OZEV) GRANT: the EV Chargepoint Grant (formerly OZEV Homecharge Scheme) provides a subsidy of up to £350 off the cost of a home charge point for owner-occupiers who own or lease a new eligible EV; administered via the charge point manufacturer; CABLE RUN FOR AN EV CHARGE POINT IN A LONDON TERRACE: the charge point is typically installed on the FRONT ELEVATION or SIDE OF THE PROPERTY; the cable run from the consumer unit (typically under the stairs at the rear of the hall or in the cellar) to the front or side wall can be SIGNIFICANT — typically 10-25m of 6mm² or 10mm² twin-and-earth run through the floor void or ceiling void; THIS CABLE RUN IS SIGNIFICANTLY EASIER AND CHEAPER TO INSTALL DURING A RENOVATION (when floorboards are up and walls are chased) than as a retrofit after the renovation is complete (retrofitting requires either surface trunking or significant additional chasing); STRONGLY RECOMMENDED: install the EV charge point circuit cable run during the renovation first fix even if the charge point itself is fitted later; SMART HOME ELECTRICAL INFRASTRUCTURE IN LONDON HOME RENOVATIONS IN 2025: SMART LIGHTING (PHILIPS HUE, LUTRON, KNX, LOXONE): SMART LIGHTING SYSTEMS require planning at the DESIGN STAGE of the renovation; the choice of system determines the WIRING REQUIREMENTS: WIRELESS SMART LIGHTING SYSTEMS (PHILIPS HUE, LIFX): operate via SMART BULBS in standard pendant and downlight fittings; NO SPECIAL WIRING required (standard 1.5mm² lighting circuit); the hub or bridge connects via the home WIFI or ZigBee network; DOWNSIDE: the bulbs are expensive; the light switches must be either SMART SWITCHES or BYPASSED (in a Philips Hue setup, the standard wall switch must STAY ON and the light is controlled via app, voice, or smart switch); the standard light switch cannot be used normally; SMART SWITCH WIRED SYSTEMS (LUTRON CASETA, SHELLY, SONOFF): SMART SWITCHES fit in place of standard light switches; IMPORTANT WIRING DIFFERENCE: most smart switch systems require a NEUTRAL WIRE at the switch position; STANDARD UK 2-WIRE LIGHTING CIRCUITS DO NOT BRING THE NEUTRAL TO THE SWITCH POSITION — they use a switched live; if smart switches requiring a neutral are specified, the circuit must be wired with 3-CORE CABLE (TWIN-AND-EARTH PLUS A SWITCHED-LIVE WIRE — often achieved with 3-CORE-AND-EARTH CABLE) to bring the neutral to the switch; THIS IS A SIGNIFICANT REWIRING IMPLICATION — specify at design stage to avoid rewiring switch legs later; WHOLE-HOME WIRED SYSTEMS (LUTRON RADIO RA3, KNX, LOXONE): these professional-grade systems use DEDICATED WIRING (often CAT5E or CAT6 data cable for KNX and Loxone, or Lutron's proprietary 2-wire bus) for lighting and shading control; the wiring for these systems runs from a CENTRAL PROCESSOR to each switch position, light fitting, and sensor; THESE SYSTEMS REQUIRE SPECIALIST DESIGN AND INSTALLATION (a KNX or Loxone integrator) and are typically budgeted at £10,000-£50,000+ for a full London house installation; APPROPRIATE FOR HIGH-END LONDON RENOVATION (£1M+ properties); ELECTRICAL COSTS IN LONDON IN 2025: LONDON ELECTRICIAN DAY RATE: approximately £250-£450 per day (qualified electrician; London rates; varying by experience); EICR (ELECTRICAL INSTALLATION CONDITION REPORT — 3-BED TERRACE): approximately £200-£500; CONSUMER UNIT REPLACEMENT (SUPPLY AND FIT — METAL CONSUMER UNIT WITH RCBO PER CIRCUIT, 12-WAY): approximately £600-£1,500 including disconnection, new consumer unit, reconnection, and certification; FULL REWIRE (3-BED VICTORIAN TERRACE — LABOUR AND MATERIALS): approximately £4,500-£9,000 (this replaces all fixed wiring; includes new consumer unit, back-boxes, all socket and switch wiring, light points, testing and EIC certification); FIRST FIX AND SECOND FIX (ELECTRICAL PACKAGE IN A FULL RENOVATION — NOT A FULL REWIRE BUT SIGNIFICANT ADDITIONS): approximately £3,000-£8,000 for a 3-bed terrace depending on the number of new circuits and points added; EV CHARGE POINT INSTALLATION (7kW SINGLE-PHASE — SUPPLY, INSTALL, AND COMMISSION): approximately £800-£2,000 (supply and fit including dedicated circuit cable run); OZEV GRANT (UP TO £350) reduces the net cost; SMART LIGHTING WIRING UPGRADE (ADDITIONAL COST VS STANDARD LIGHTING WIRING — 3-BED TERRACE): approximately £500-£2,000 additional for 3-core cable and neutral-at-switch provision throughout; AFDD (ARC FAULT DETECTION DEVICES — ADD TO CONSUMER UNIT): approximately £50-£100 per AFDD device supply and install cost; SMOKE ALARMS AND HEAT ALARMS (PART B REQUIREMENT): a renovated London property must have interlinked mains-powered SMOKE ALARMS on each floor and a HEAT ALARM in the kitchen; the ELECTRICIAN installs these at second fix; approximately £80-£200 per alarm point supply and install; EXTERNAL LIGHTING AND GARDEN SOCKETS: an EXTERNAL SOCKET (IP-RATED — IP65 or higher) on the rear elevation: approximately £200-£500 per socket supply and install (including a dedicated circuit if not already run); a DOUBLE POLE ISOLATOR SWITCH and EXTERNAL WEATHERPROOF SOCKET for a garden outbuilding circuit: approximately £400-£800.