1. When should you replace your consumer unit?

Five clear triggers: (1) fuse board without RCDs — common in pre-1980 Luxembourg homes and increasingly refused by insurers; (2) full board with no spare capacity for new circuits (EV charger, heat pump); (3) undersized board for a modern home’s consumption; (4) board over 25–30 years old showing physical deterioration; (5) as part of a complete renovation where the electrician is already on site. There is no legal periodic replacement obligation in Luxembourg, but compliance becomes mandatory across all affected circuits whenever modification work is carried out under the Technical Connection Conditions (CTR) of Creos and Sudstroum.

2. Anatomy of a modern consumer unit: components and roles

A modern Luxembourg consumer unit consists of DIN-rail mounted modules inside a housing. Key mandatory components: the main circuit breaker (60–130 €), 30 mA RCDs — type A for sensitive circuits (kitchen, bathroom), type AC for standard circuits (30–80 € each), and individual MCBs for each circuit (5–20 € each). Optional but recommended: a type 2 surge protector (50–150 €). Pre-wired boards (150–600 €) save installation time; bare boards (40–200 €) offer more flexibility for complex or custom installations.

3. How many rows does your consumer unit need?

Standard guidance: 2 rows for under 35 m², 2–3 rows for 35–70 m², 3–4 rows for 70–100 m², 4 rows minimum for 100–150 m², 4–5 rows or a sub-board for 150 m²+. Always plan for 20% spare capacity. From installation, add dedicated circuits for an EV charger (16 or 32 A), heat pump, and solar inverter — far cheaper to plan now than retrofit later. Most Luxembourg homes are single-phase; three-phase requires a prior declaration to Creos or Sudstroum and may trigger a meter upgrade.

4. Consumer unit replacement prices in Luxembourg (2026)

Luxembourg electricians charge 75–100 €/h for renovation work — 20–30% above French rates. A 2-row board costs €900–1,400 HT; 3 rows €1,300–2,000 HT; 4 rows €1,800–2,800 HT; 4–5 rows with sub-board €2,500–4,000 HT. All figures include supply and installation. Earthing creation adds €1,000–2,200; EV charger circuit adds €500–1,200; surge protection adds €150–300 installed.

5. Legrand, Schneider, Hager: which brand in Luxembourg?

All three dominate the professional market. Hager is often the first choice of Luxembourg electricians due to cultural proximity with German VDE standards and spare-parts availability. Legrand (Drivia range) is very common in Kirchberg and city centre apartments. Schneider Electric (Resi9) is valued for robustness in detached houses. Always avoid uncertified entry-level brands — they are not guaranteed compatible with Luxembourg standards and are difficult to service by local professionals.

6. 3% VAT on consumer unit replacement: what the AED says

The official AED FAQ (pfi.public.lu) explicitly states that consumer units are covered by the Grand-Ducal regulation of 30 July 2002 and eligible for the 3% super-reduced VAT rate. Conditions: home over 20 years old, primary residence, Luxembourg-registered electrician with AED pre-authorisation. Excluded: dimmers and EV charging stations. The saving on a €2,500 HT board is €350. Claim via direct application (electrician requests AED authorisation before works) or post-works reimbursement within 5 years. Global cap: €50,000 per dwelling.

7. How the work unfolds: from removal to commissioning

Consumer unit replacement typically takes 2–8 hours depending on installation size and wiring complexity. The six steps are: (1) preliminary inspection and wiring diagram update; (2) power cut and old board removal, carefully labelling each circuit; (3) new board installation with mandatory 20% spare capacity; (4) earthing verification (max 100 Ω per VDE 0100) — mandatory creation if absent; (5) commissioning tests: continuity, insulation resistance, RCD trip time (<30 ms at 30 mA); (6) circuit labelling, updated diagram and invoice with applicable VAT rate.

8. Smart consumer units and home automation

A board replacement is the ideal moment to add smart features. Connected modules (Legrand Netatmo, Schneider Wiser, Hager Coviva) enable per-circuit consumption monitoring via smartphone (add €200–600). A smart load-shedder (€150–400 installed) manages simultaneous power peaks — increasingly relevant since the ILR’s January 2025 power-based network tariff reform. KNX/EIB interface for full home automation: €300–800 supply + programming, eligible for 3% VAT (confirmed by AED FAQ).

9. Choosing your electrician for board replacement in Luxembourg

Four essentials: (1) BT concession verified on chambre-des-metiers.lu; (2) detailed quote naming exact board model, number and type of modules, labour hours, applicable VAT, and a commitment to supply the updated wiring diagram; (3) at least 3 comparative quotes — 30–40% price differences are common; (4) valid professional liability insurance for Luxembourg. Book 3–4 months in advance: qualified electricians in Luxembourg are chronically overbooked.

FAQ — Consumer unit replacement in Luxembourg