The short answer: a professional installation takes one to two days on site. The whole process, from first survey to generating power, usually takes a few weeks.
This page explains what a certified installer does. If you are thinking of doing it yourself, read can you install solar panels yourself first.
The eight steps
1. Survey and design
The installer measures the roof, checks its condition and direction, assesses shading and looks at your consumer unit. You should receive a design showing where the panels will go and an estimate of how much electricity they will generate each year.
2. Quote and contract
The quote should name the panel, inverter and battery models, itemise the costs and state the system size. See how to choose an installer.
3. Network operator approval
Your installer deals with the local electricity network operator. Smaller systems are simply notified after installation. Larger systems need approval in advance, which can add several weeks.
4. Scaffolding
Scaffolding normally goes up a day or two before the installation.
5. Mounting
Installers lift a few tiles, fix brackets to the rafters, replace the tiles and attach rails to the brackets. On flat roofs, panels sit in angled frames.
6. Panels
The panels are clamped to the rails and wired together.
7. Inverter and electrics
The inverter, which turns the panels' output into usable household electricity, is fitted in the loft, garage or utility room and connected to your consumer unit. A battery, if you have chosen one, goes in at this stage.
8. Testing and handover
The system is tested and switched on, and the installer shows you how to monitor it.
The paperwork you should receive
- MCS certificate
- Confirmation that the network operator has been notified or has approved the system
- Building regulations compliance certificate for the electrical work
- Warranties for the panels, inverter, battery and workmanship
- An insurance-backed guarantee
Keep them safe. You need the MCS certificate to claim export payments, and a buyer's solicitor will ask for all of them if you sell.
After installation
Apply for an export tariff as soon as you have your MCS certificate. See Smart Export Guarantee rates.
More on installation
- How long does it take to install solar panels?
- Best time of year to install solar panels
- Can you install solar panels yourself?