New Extension & Renovation Wiring in Birmingham – First & Second Fix Electrics for Your Build

At House Rewiring Birmingham, we specialise in electrical installations for new extensions and home renovations across Birmingham and the surrounding areas. Our team wires single and double storey extensions, loft conversions, garage conversions and full refurbishments, delivering safe, certified installations that keep pace with your build schedule. We also design lighting layouts, install dedicated circuits for kitchens and underfloor heating, and upgrade consumer units where your project demands extra capacity, blending modern convenience with complete compliance. Experienced domestic electricians carry out first fix wiring while your walls are open and return for second fix once plastering is complete, coordinating directly with your builder so the electrics never hold up the job. Where your renovation uncovers older wiring, we can integrate partial rewiring seamlessly into the project, bringing the whole installation up to one consistent standard.

Getting the electrics right at the design stage is one of the smartest investments in any building project. Sockets, switches, lighting and data points are cheap to install while walls are open — and expensive to add afterwards. A well-planned electrical layout makes your new space genuinely work for the way you live, supports future additions like EV chargers and smart home tech, and ensures the finished build passes building control without delays. At House Rewiring Birmingham, we plan and install extension and renovation wiring to BS 7671 standards and Part P building regulations with precision.

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Comprehensive Extension & Renovation Wiring Services

Our extension and renovation wiring services cover every electrical aspect of your building project in Birmingham. From the initial layout design to final testing and certification, we work as part of your build team — reliable, tidy, and always on schedule.

Electrical Design and Layout Planning

Every project starts with a planning visit, ideally before your build begins. We walk through your architect's drawings or your own plans, mapping out where every socket, switch, light fitting, TV point and outdoor connection should go based on how you'll actually use the space.

We'll also assess whether your existing consumer unit has the capacity for the new circuits your project needs — flagging any upgrade early so it's costed into your build from day one, not discovered halfway through.

First Fix Wiring

Once your extension is watertight or your renovation is stripped back, we carry out the first fix — running all cabling through the new walls, floors and ceilings, and fitting back boxes for every socket and switch before the plasterers arrive.

We coordinate timing directly with your builder, working around joists, steels and stud walls, and making sure everything is photographed and documented before it disappears behind plasterboard.

Second Fix and Finishing

After plastering and decorating, we return for the second fix — fitting faceplates, sockets, switches, downlights, pendants and outdoor fittings, then connecting everything back to the consumer unit.

This is where your new space comes to life: kitchen appliance circuits energised, lighting zones working from the right switches, and every finish aligned and level. We treat the finished decoration with the same care your decorators did.

Testing, Certification and Building Control

New circuits in extensions and renovations are notifiable under Part P of the Building Regulations, and building control will expect proper electrical certification before signing off your project. Every circuit we install is fully tested and certified to BS 7671.

You receive an Electrical Installation Certificate on completion, and we handle the building control notification — so your project signs off smoothly and your paperwork is ready for future surveys or sales.

Projects We Wire Across Birmingham

From modest single storey extensions to complete house refurbishments, we provide the electrics for building projects of every size.

Single and Double Storey Extensions

Kitchen extensions are Birmingham's most popular project, and they're also the most electrically demanding — appliance circuits, downlights, extractor fans, island sockets, bifold-friendly switching and often underfloor heating. We design and install it all, working to your builder's programme.

Double storey extensions add bedrooms and bathrooms into the mix, with their own lighting circuits, shaver points, heated towel rails and smoke alarm integration.

Loft and Garage Conversions

Loft conversions need careful electrical planning — lighting that works with sloped ceilings, sufficient sockets for bedrooms or home offices, mains-interlinked smoke alarms, and often extraction for new en-suites. We wire lofts at the right stages of the conversion so nothing is missed before boarding.

Garage conversions and garden rooms frequently need new sub-main supplies, and home offices benefit from dedicated data cabling alongside the power — all of which we install and certify.

Full House Renovations

Renovating a whole property is the ideal moment to get the electrics exactly right. We wire complete refurbishments from stripped-back shell to finished home — and where the existing wiring is dated, we combine renovation wiring with partial or full rewiring so the entire installation meets one modern standard.

For landlords and developers, we work to project deadlines and provide all certification needed for building control sign-off, EICRs and onward sale or letting.

What Our Customers Say

Homeowners and landlords across Birmingham trust us with their full house rewires.

“House Rewiring Birmingham completely rewired our 1930s semi in Erdington. The team were tidy, kept us informed at every stage, and the price matched the quote exactly. Couldn’t fault them.”

Sarah T. — Erdington

“We bought a Victorian terrace in Kings Heath that failed its survey on the electrics. The full rewire was done in just over a week, with far less mess than we expected. Highly recommend.”

James P. — Kings Heath

“As a landlord with several properties, I needed a rewire after a failed EICR. The work was completed between tenancies, fully certified, and my letting agent was impressed with the paperwork.”

Michael R. — Solihull

“Brilliant service from start to finish. The survey was thorough, the quote was clear, and the electricians even worked around our new kitchen installation. Our home finally has enough sockets!”

Priya K. — Sutton Coldfield

Extension & Renovation Wiring FAQs

When should I involve an electrician in my extension project?

As early as possible — ideally at the design stage, before your build starts. Planning the electrical layout early means sockets and lighting end up where you actually need them, any consumer unit upgrade is costed in from the start, and the first fix slots neatly into your builder’s schedule.

How much does extension wiring cost in Birmingham?

It varies with the size of the project and the number of circuits. As a rough guide, wiring a single storey extension typically ranges from around £1,500 to £3,500, with kitchen extensions at the higher end due to appliance circuits. We provide a fixed written quote from your plans, free of charge.

What are first fix and second fix electrics?

First fix is all the work done while walls and ceilings are open — running cables and fitting back boxes. Second fix happens after plastering, when we fit the visible parts: sockets, switches, lights and the final connections. Splitting the work this way is standard practice on every building project.

Can my existing fuse board handle an extension?

Sometimes, but many older consumer units have no spare ways for new circuits. We check this at the planning stage — if an upgrade is needed, it’s far better to know before the build starts. A modern consumer unit also gives you capacity for future additions like an EV charger.

Does extension wiring need building control approval?

Yes — new circuits are notifiable under Part P of the Building Regulations, and building control will want electrical certification before signing off your extension. We test and certify everything we install and handle the notification for you, so sign-off goes smoothly.