New home wiring in Seville, Spain: complete electrical installation for new builds

What new home wiring includes

The electrics of a new build are not just about pulling cables: they are the design of how you will use electricity in your home for decades. They include:

• Main control and protection board (fuse board, consumer unit), with a main switch, RCDs shared out by area, a circuit breaker per circuit and a surge protector where applicable. We go into detail on fuse board replacement.
• Independent circuits for lighting, general sockets, cooker and oven, washing machine and dishwasher, bathroom and, with high electrification, air conditioning, heating, tumble dryer and other uses.
• Light points, switches, two-way switches and sockets in every room, including TV and data sockets if you need them.
• Earthing with its main line and every circuit connected. See earthing.
• Recessed conduits with tubing and accessible junction boxes.
• Installation certificate (CIE) and legalisation with the Junta de Andalucía, so the supply can be connected.

Basic or high electrification

The Spanish Low Voltage Electrotechnical Regulation, in ITC-BT-25, defines two electrification levels for homes:

• Basic: minimum power of 5,750 W and five circuits (C1 to C5).
• High: minimum power of 9,200 W and additional circuits up to C12, for air conditioning, heating, tumble dryer, more sockets or home automation.

In Seville, where almost every home has air conditioning, an induction hob (cooktop) and a water heater or heat pump, high electrification is the reasonable choice. Current developments in the province are already handed over that way. If you design a new house with basic electrification, you will probably end up adding circuits before long.

How we work

1. Study of the plans. We review with you the layout of light points, sockets and circuits according to how you will live in the house: where the TV, the kitchen island, the study or the car charger will go.
2. Fixed quote with the number of points, the electrification level and the switches and sockets chosen.
3. Chases, conduit and boxes in the shell phase, coordinated with the bricklaying, plumbing and air conditioning trades.
4. Wiring and fitting the fuse board, with the cross-sections and protections set by ITC-BT-25 and earthing under ITC-BT-18 and ITC-BT-26.
5. Switches, sockets and testing. We fit switches and sockets and measure insulation, earthing and RCDs.
6. Paperwork. We write the technical design report (ITC-BT-04), issue the electrical certificate (boletín) and register it with the Junta de Andalucía. With it you can request your new electricity connection from the distributor.

Only a registered electrical contractor can sign the boletín. A self-builder, or a tradesman qualified in another country, cannot certify the installation in Spain, however good the work is.

What to plan for from the start

It is much cheaper to leave things ready now than to open walls later:

• EV charging. In new residential buildings, CTE HE 6 (Royal Decree 450/2022) requires charging conduit in 100 % of spaces. In a villa, leave a line to the garage ready for a home EV charger.
• Aerothermal heat pump (aerotermia), with its own line and protection. If you are going to install one, see heat pump electrics.
• Solar panels and batteries, with room in the fuse board and conduit up to the roof. See solar panels.
• Motorised blinds, awnings and home automation, with cable or conduit to every opening. See motorised blinds and awnings.
• Outdoor sockets and garden and pool lighting, with the right protection rating. See outdoor lighting.

New builds in Seville: where we work most

The Seville area is going through a period of intense new building. As well as the big developments, such as Entrenúcleos in Dos Hermanas, Isla Natura in Palmas Altas or Hacienda del Rosario in Sevilla Este, which you can see in our new-build section, there are many self-built detached houses in towns such as Utrera, Carmona or Los Alcores, where activity is mostly small local developments. A common case: a family building their villa on a plot in Mairena del Alcor who want the heat pump, the solar panels and the charger ready from the start. Planning those lines on the plans avoids secondary fuse boards and visible trunking later.

If you are a builder, developer or architect, we also work on complete projects with a phased schedule. See builders, developers and for professionals.

Guide price

These are guide prices. The final quote depends on the number of points, the electrification level, the range of switches and sockets and the extras you want to plan for. You get it as a fixed price from the plans. You can see the rest of our work on the electrical installations page.