New electricity connection costs in the UK range from around £1,200 for a simple domestic service to well over £500,000 for a large commercial HV connection with a dedicated substation. The variation is not random. It is driven by load size, distance from the existing network, the ownership route chosen, and a set of site-specific factors that can be priced in advance.
This guide explains the cost drivers and gives realistic pricing for 2026.
What Is Contestable and What Is Not
Under the UK electricity connection regime, the work splits into two parts.
Contestable work is the design, installation, and commissioning of assets that sit on the customer’s side of the point of connection. It includes service cables, customer substations, and metering infrastructure. Any Independent Connection Provider (ICP) can compete to deliver it.
Non-contestable work is the interface with the existing Distribution Network Operator (DNO) infrastructure. It includes the tie-in to the existing network, capacity allocation, and system protection settings. Only the DNO can do this.
The pricing effect is that you can compete the contestable portion (sometimes up to 70 per cent of the total cost) between providers. The non-contestable portion is a fixed cost set by the DNO’s published charging methodology.
Domestic Connection Costs
A new domestic electricity connection on a property with an existing LV cable in the street typically runs:
Single-phase connection (up to 100A): £1,200 to £3,000.
Three-phase connection (for heat pumps, EV chargers, or larger homes): £2,500 to £6,000.
Cable run of more than 10 metres from the main to the meter position: add £80 to £150 per metre.
If the existing network needs reinforcement (for example, a new pole transformer or a cable upgrade), costs climb into the £8,000 to £25,000 range.
Small Commercial Connections
Small commercial connections (up to around 200 kVA) on LV typically run £5,000 to £20,000. The main drivers are cable length, whether the existing LV network has capacity, and the complexity of the customer’s internal panel board.
Some typical examples:
A new retail unit with a 100 kVA LV connection on an existing service road: £6,000 to £12,000.
A small commercial kitchen with a three-phase 200 kVA connection: £10,000 to £18,000.
A light industrial unit with LV supply to a single panel board: £8,000 to £22,000.
Medium and Large Commercial Connections
Above 500 kVA, connections typically move from LV to HV, and the cost profile changes.
An HV connection with a new customer substation (ground-mounted) runs £60,000 to £150,000 for a typical 11kV connection serving 500 kVA to 1 MVA.
A large HV connection with a dedicated DNO substation, a ring main unit, and transformer capacity above 1 MVA can run £150,000 to £500,000.
Very large industrial connections above 5 MVA are priced project-specifically and can exceed £1,000,000.
Housing Development Connections
Housing developments are priced per plot once the main LV network is designed through the estate.
Typical per-plot costs range from £700 to £1,500 for standard plots on a site with reasonable cable runs.
For sites using an Independent Distribution Network Operator (IDNO) asset adoption model, the developer’s upfront cost is reduced because the IDNO pays an asset value and recovers revenue over time through the end users’ bills.
For sites served directly by the incumbent DNO (adopted network), the upfront per-plot cost is higher but the end-user bill structure is simpler.
On a 100-plot site, the total cost difference between IDNO and DNO routes can be £40,000 to £80,000 in favour of the IDNO model.
What Drives the Cost
Six factors drive most of the cost variation on electricity connections.
Load size in kVA. Larger load means larger cables, larger transformers, and in many cases a move from LV to HV.
Distance from the existing network. Cable costs £30 to £80 per metre for LV and more for HV, plus civils.
Ground conditions. Soft verges are cheap. Tarmac roads are expensive. Footpaths sit in between.
Traffic management. Road closures on main routes add significant cost.
Network reinforcement. If the existing network cannot support the new load, upstream reinforcement costs get passed on.
Substation requirements. A customer substation, GDN-adopted DNO substation, or a ring main unit can add tens of thousands to the price.
How to Reduce the Cost
Get quotes from at least two ICPs, and from the incumbent DNO. Compare like-for-like on what is included.
Fix the load early and accurately. Overestimating load inflates the cost. Underestimating it means an expensive upgrade later.
Consider an IDNO asset adoption model on housing developments and large mixed-use sites.
Coordinate with other utility contractors for shared trenches and traffic management.
Ask for a detailed cost breakdown rather than a headline figure. This reveals where costs can be negotiated.
The Bottom Line
Electricity connection costs are predictable once you know the load, the distance, and the site conditions. The biggest difference between a low quote and a high quote on the same site is usually whether the design has been optimised and whether you have compared the contestable portion across providers. Both are worth doing on any project where the connection cost is material, and we cover the wider savings levers in our guide to reducing utility connection costs on development.