The short answer: the installation itself usually takes one to two days. From accepting a quote to generating electricity typically takes a few weeks, and longer if your system needs approval from the network operator first.
Time on site, by number of panels
| System | Typical time on site |
|---|---|
| 6 panels | Half a day to one day |
| 10 to 12 panels | One day |
| 16 to 20 panels | One to two days |
| Any system with a battery | Add up to half a day |
These are typical times for a straightforward roof.
The whole timeline
| Stage | Typical time |
|---|---|
| Survey and quote | A few days to two weeks |
| Network operator approval, if needed | Up to several weeks |
| Scaffolding | Goes up a day or two before |
| Installation | One to two days |
| Testing and handover | Same day |
| Scaffolding removal | Within a few days |
| MCS certificate | Usually within days of completion |
| Export tariff set up | A few weeks, depending on the supplier |
What slows an installation down
- Larger systems. Bigger inverters need the network operator's approval before work starts.
- Awkward roofs. Slate, steep pitches, several roof faces and three-storey homes all take longer.
- Weather. High winds and heavy rain stop roof work.
- Busy periods. Spring and summer are the peak season. Expect longer waits ahead of the VAT change on 31 March 2027.
- No smart meter. You need one to be paid for exports.
Will the power be off?
Only briefly, while the system is connected to your consumer unit.
For what happens at each stage, see how solar panels are installed.