1 guide

Electrical Infrastructure Guides

Every electrical infrastructure guide from the SMS engineering team — practical, factual, and from the people who fit the systems.

2026-05-14· 9 min read

Three-Phase DNO Upgrade UK 2026 — Process, Costs, and When It's Worth It

A practical 2026 guide to the Distribution Network Operator (DNO) three-phase upgrade process for UK homes. Costs, timelines, when 22 kW EV charging or 12 kWp+ solar PV make the upgrade worth it.

Where to go next

Doing both at once? solar and battery installation.
On the modular side, EcoFlow PowerOcean.
If you have settled on Tesla, Tesla Powerwall.
Large roof on a farm or agricultural building? solar for farms and agricultural buildings.

Is your system worth upgrading? Find out free.

Tell us your postcode and what you have. A real engineer reviews it and comes back within one working day with an honest answer — including when the answer is "leave it alone".