Electrical work
Electrician in Castelldefels
New electrical installations, rewiring, fuse box upgrades and fault repairs for homes, shops and businesses. As an authorised electrical installer, we also issue the electrical installation certificate (the “boletín”).
- Authorised electrical installer
- We issue the electrical certificate
- Free, no-obligation quote

What we do
Electrical services
From adding a socket to wiring a whole home, always with approved materials and a tidy installation.
New electrical installations
For homes, shops and new builds, sized for how you are going to use them.
Extensions and alterations
New sockets, light points and circuits for the kitchen, air conditioning or charging equipment.
Fuse box upgrades
We replace old fuse boxes with new consumer units with RCDs and circuit breakers, neatly organised and labelled.
Bringing installations up to code
We update old installations so they comply with the Spanish low-voltage regulations (REBT).
Electrical certificate (CIE)
We inspect the installation and issue the certificate you need to connect the electricity supply or increase the contracted power.
Fault repairs
We find the cause of trips, power cuts or dead sockets and fix it.
When to call us
Signs your installation needs checking
- The trip switch goes off often, or the power cuts out when several appliances are on.
- Your fuse box still has screw-in fuses or no RCD.
- You are about to renovate the kitchen, the bathroom or the whole home.
- You need more sockets or light points where there are none.
- You need to connect the supply or increase the power and have been asked for the certificate.
- You notice a burning smell, warm sockets or sparks.
If you notice a burning smell or sparks, switch off the main switch and call us.

Our work
New sockets in a home
We added sockets where the client needed them, with the wiring recessed and the wall ready to paint.


How we work
From your first message to the finished job
One team from start to finish and direct communication at all times.
- STEP 1
Tell us what you need
On WhatsApp or by phone. If you can, send us photos of the fuse box or the area.
- STEP 2
We inspect the installation
We check its current condition and explain what should be done and why.
- STEP 3
Quote and work
We send you a clear quote and, if you accept it, we get to work.
Frequently asked questions
Your most common questions about electrical work
What is the electrical certificate and when do I need it?
It is the Electrical Installation Certificate (CIE, often called the “boletín”), the document that shows an installation complies with the Spanish low-voltage regulations. It is usually required to connect the electricity supply in a home or shop, after rewiring, or when increasing the contracted power. Your electricity company will tell you whether you need it.
Can you issue the certificate yourselves?
Yes. We are an authorised electrical installer: we inspect the installation, carry out any work needed and issue the certificate.
How do I know if my fuse box is outdated?
Common signs are screw-in fuses instead of switches, no RCD, frequent trips, parts that get warm, or an installation that is many years old and has never been updated. If in doubt, we will check it and tell you whether it is worth replacing.
Do you also work in shops and businesses?
Yes. We carry out installations, extensions and repairs in homes, shops and businesses.
Which areas do you cover?
We work in Castelldefels, Gavà, Viladecans, Sitges, Baix Llobregat, Garraf and Barcelona. If your project is somewhere else, just ask us, with no obligation.
How much does an electrical installation cost?
It depends on the size of the space, the condition of the installation and what you need. We look at your case first and then prepare a clear, no-obligation quote.
Need an electrician in Castelldefels?
Tell us what you need and we will prepare a free, no-obligation quote. We work from Castelldefels across Barcelona and the surrounding area.
+34 616 079 814instalacions@marin57.cat