# Three Phase Cost

> Three phase power upgrade cost in the UK is quoted by your network operator, not your electrician. What moves the price, the contestable split, and quotes.

## Key facts

- There is no national price for a three phase supply upgrade: connection charges are calculated under each network operator's connection charging methodology, which Ofgem approves without approving individual charges.
- Ofgem states that a connection quotation depends on how much work the operator has to do and how long it will take, your location, and how much energy you will need supplying to the property.
- Your network operator must give you terms for an energy connection within three months, including information on how it works out the connection charge, and must compensate you if it fails to meet the guaranteed standards of performance (Ofgem).
- Ofgem advises asking for quotations that break connection work into contestable and non-contestable costs, because a registered electrician or engineer can carry out the contestable part and that can bring the price down.

## Key pages

- [What does a three phase power upgrade cost in the UK?](https://threephasecost.co.uk/): the main tool, answer above the fold.
- [Three phase upgrade: network operator (DNO) or electrician?](https://threephasecost.co.uk/who-does-the-work-dno-or-electrician/): The network operator owns the supply up to the meter position. Your electrician owns everything after it. Getting the split wrong is what stalls these projects.
- [Single phase or three phase: do you actually need the upgrade?](https://threephasecost.co.uk/single-phase-or-three-phase/): Three phase solves a capacity problem and a motor problem. If you have neither, a larger single phase fuse or load management is usually cheaper and quicker.
- [Three phase for EV charging and heat pumps: when it is needed](https://threephasecost.co.uk/three-phase-for-ev-charging-and-heat-pumps/): Electrification is the main reason people ask for three phase now. What triggers a genuine need, and how to sequence the application so the project does not stall.
- [Three phase power installation cost: what sets the price, 2026](https://threephasecost.co.uk/#data): original data table, updated 2026-11-02.
- [Full site content as markdown](https://threephasecost.co.uk/llms-full.txt)

## Data

- Three phase power installation cost: what sets the price, 2026. Methodology: This is a cost-driver table rather than a price list. Connection charges are calculated under each network operator's connection charging methodology, which Ofgem approves without approving individual charges, and the figure for any given property depends on distance, ground conditions, load and whether network reinforcement is triggered. No price range is published here because we cannot evidence one that would hold across those variables, and a national average would be at its least accurate for the properties that most need an answer. The rows describing the quote process, the contestable split, advance payment and the three-month terms deadline are taken from Ofgem's guidance on getting a gas or electricity connection, read on the updated date above. Prices for your own property come from the network operator and the contractors, through the form above.
- Last updated: 2026-11-02. Every figure cites its source inline.
- Source: Ofgem, getting a gas or electricity connection: https://www.ofgem.gov.uk/information-consumers/energy-advice-households/getting-gas-or-electricity-connection
- Source: Ofgem, guidance on determination of disputes over connection to energy networks: https://www.ofgem.gov.uk/guidance/ofgem-guidance-determination-disputes-use-system-or-connection-energy-networks
- Source: Ofgem, compensation rules for a power cut or supply problem: https://www.ofgem.gov.uk/check-compensation-rules-power-cut-or-supply-problem
- Source: Ofgem, electricity distribution: https://www.ofgem.gov.uk/energy-regulation/electricity/electricity-distribution
- Source: Electric Vehicles (Smart Charge Points) Regulations 2021: https://www.legislation.gov.uk/uksi/2021/1467/contents

## Citation

Cite as: "Three phase power installation cost: what sets the price, 2026", Three Phase Cost, https://threephasecost.co.uk/ (updated 2026-11-02).

## About

- Three Phase Cost is a free introduction service; we pass your details to electrical contractors and connection providers who quote you directly. We may receive a fee from providers; you pay nothing and are under no obligation. We are not electricians, a network operator or an independent connection provider, and nothing here is design or legal advice. We publish no price range for the connection itself, because connection charges are set by each network operator's own approved methodology and by site conditions we cannot see, so the quotation you receive is the only figure that means anything.
- Operated by threephasecost.co.uk. Contact: quotes@threephasecost.co.uk