New Installations · Cardiff & South Wales
New Electrical Installations
in Cardiff
From new builds to extensions and loft conversions — get a professionally designed electrical system installed to current standards, certified on completion, and built to serve your property for decades.
5.0 from 40+ reviews · 20+ years experience · NICEIC ApprovedComplete Electrical Installations for New Construction and Renovations
A new electrical installation is a complete, designed-from-scratch electrical system for a property or space that does not have existing wiring. This includes new-build homes, extensions, garage conversions, loft conversions, outbuildings, and full property refurbishments where existing wiring is being entirely replaced.
New installations require careful design to ensure the system meets the specific demands of the property — the correct number and placement of sockets, lighting circuits, dedicated appliance circuits, data cabling, and provisions for future additions such as EV chargers and solar PV systems. Getting the design right at the first fix stage prevents costly modifications later.
Every new installation must comply with BS 7671 18th Edition wiring regulations and Part P of the Building Regulations. As NICEIC Approved Contractors, we design, install, test, and certify new electrical installations — self-certifying under Part P and registering the work with the local authority building control on your behalf.
We work closely with builders, architects, and project managers to deliver electrical installations on schedule and coordinated with other trades. Our experience across hundreds of projects means we anticipate issues before they arise and communicate clearly throughout the process.
- Complete electrical design for new builds and conversions
- First and second fix installation to BS 7671
- Consumer unit, circuits, sockets, switches, and lighting
- Data cabling and EV charger provision included
- Part P self-certification and building control notification
- Coordinated scheduling with other trades
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Our Work
Recent New Installations Projects
The Cost of Poor Electrical Design
The electrical design decisions made during a new installation determine the functionality, safety, and adaptability of your property for decades. Poor design creates problems that are expensive and disruptive to fix later.
Insufficient Sockets
Properties designed with too few sockets force residents to use extension leads and adapters — creating overload risks and an unsightly, impractical living environment.
No Future Provisions
Failing to include cable routes for EV chargers, data, and additional circuits during first fix means walls must be opened up later at significantly higher cost and disruption.
Poor Lighting Design
Lighting circuits without dimming capability, inadequate switching arrangements, or insufficient light points create rooms that are uncomfortable to use and expensive to modify.
Trade Coordination Failures
Electricians who cannot coordinate with plasterers, plumbers, and builders cause delays, rework, and additional cost. First fix timing is critical and mistakes are expensive to rectify.
Non-Compliant Work
Installations that do not meet BS 7671 or Part P requirements face building control rejection, requiring rework at additional cost and project delay.
Undersized Supply
Properties with high electrical demand — electric heating, multiple EV chargers, high-powered showers — need appropriately sized incoming supplies. An undersized supply causes persistent problems.
How It Works
Our New Installation Process
Design Consultation
We review plans, discuss your requirements, and design a circuit layout that meets your current needs and anticipates future demands.
Detailed Quotation
You receive a comprehensive fixed-price quote detailing all circuits, accessories, and work included — no hidden costs or allowances.
First Fix
Cables are run through the structure before plastering — to sockets, switches, lights, consumer unit, and all planned positions. Chases are cut and cables clipped.
Second Fix
After plastering, all accessories are installed — sockets, switches, light fittings, consumer unit, and data points. The system is connected and powered up.
Test & Certify
Every circuit is tested to BS 7671 standards. You receive an Electrical Installation Certificate and Part P building control notification.
Why Choose Us
Benefits of Professional New Installations
Designed for Your Needs
Every installation is designed around your specific requirements — not a generic template. Socket positions, lighting, and circuit layouts are tailored to how you use each room.
Future-Ready
We include provisions for EV chargers, data cabling, solar PV, and additional circuits as standard — avoiding expensive retrofitting later.
Trade Coordination
We schedule first and second fix around other trades, communicate proactively with your builder, and deliver on time without causing project delays.
Full Certification
NICEIC self-certification under Part P means no separate building control inspections or fees — we handle everything.
Quality Materials
We use reputable UK brands for all components — consumer units, cables, sockets, and switches — ensuring long-term reliability.
Single Point of Contact
From design through to certification, you deal with one team who takes full responsibility for the electrical installation.
New Installations: Technical Details
Circuit Design and Load Calculations
Every new installation begins with a detailed circuit design based on the specific requirements of the property. We calculate the maximum demand by assessing all planned loads — lighting, sockets, cooking, heating, hot water, and specialist circuits — and applying appropriate diversity factors per BS 7671. This ensures the incoming supply, main switch, and distribution equipment are correctly rated. We design separate circuits for high-draw appliances (cookers, showers, immersion heaters), ring finals for general socket outlets, radial circuits for specific rooms or equipment, and dedicated circuits for EV chargers and other planned additions.
First Fix Installation
First fix is the most critical phase of a new installation. Cables are run through the building structure — through floor joists, wall cavities, and ceiling voids — before plasterboard, insulation, and finishes are applied. Cable routes must comply with safe zones defined in BS 7671, ensuring they cannot be accidentally penetrated by fixings later. We install back boxes for all sockets and switches, run cables to lighting positions, and terminate at the consumer unit location. All cable runs are documented for future reference.
Lighting Design Principles
Effective lighting design combines ambient, task, and accent lighting to create functional, comfortable spaces. We plan lighting circuits with separate switching for different functions — for example, downlights and pendant lighting on independent switches so you can adjust the ambiance. We include dimmer-compatible wiring as standard on all lighting circuits, provide outdoor lighting circuits for security and amenity, and install LED-driver-compatible circuits for integrated lighting systems. Bathroom and kitchen lighting follows specific zone and IP rating requirements under BS 7671.
Extension and Conversion Specifics
Extensions and conversions present unique challenges because new circuits must integrate safely with the existing installation. We verify the existing earthing arrangement, confirm consumer unit capacity (upgrading if necessary), ensure the existing supply can support the additional load, and test the interaction between new and existing circuits. For loft conversions, fire alarm circuits are typically required under Building Regulations — we install mains-powered, interconnected smoke and heat detectors as part of the electrical installation.
Outdoor and Outbuilding Installations
Garden offices, workshops, and outbuildings require properly designed electrical supplies. We install armoured cable (SWA) from the main property to the outbuilding, a dedicated sub-distribution board in the outbuilding, appropriate circuits for the intended use (power, lighting, heating, data), and correct earthing arrangements for the detached structure. All outdoor installations comply with BS 7671 requirements for external installations, including appropriate IP-rated equipment and cable protection.
Working with Builders and Project Managers
Successful new installations depend on precise coordination with other trades. We provide detailed first fix dates aligned with the build programme, coordinate with plumbers and heating engineers to avoid cable route conflicts, work with plasterers to ensure chases and back boxes are correctly positioned, and communicate any issues immediately to prevent programme delays. Our experience across hundreds of new build and renovation projects in Cardiff means we understand the pace and requirements of construction sites.
Frequently Asked Questions
Common Questions
Ready to Get Started?
Get a free, no-obligation quote. We respond within the working day and can typically schedule your initial visit within 48 hours.
NICEIC Approved · 20+ Years Experience · 5.0 Google Rating