Do you need a new consumer unit for solar?
Some homes need a new or upgraded consumer unit (fuse board) for solar, typically costing £300 to £600, if the existing board is old, full, or lacks the right protection. Many modern boards are fine as they are. Your installer confirms this at the roof survey, so ask for it to be itemised in the quote.
When an upgrade is needed
- The existing board is an older type without modern protective devices.
- There is no spare way to connect the solar circuit.
- The earthing arrangement needs improving for safety.
- A battery is being added that requires its own protected circuit.
Make sure it is in the quote
A new consumer unit is a common 'extra' that can surprise people if it is left out of an initial estimate. Ask each installer whether your board is suitable and, if not, see the upgrade cost itemised so you can compare quotes fairly.
Frequently asked questions
- Will every home need a new fuse board for solar?
- No. Many modern boards are suitable. Older or full boards may need upgrading, which the survey will confirm.
- How much does a consumer unit upgrade cost?
- Typically £300 to £600 depending on the work and any earthing improvements needed.
Related questions
Indicative estimates based on UK average data. Last updated 27 May 2026.