How Long Does Solar Panel Installation Take?
A typical UK residential solar panel installation takes 1–2 days on site. The full end-to-end timeline — from initial quote to commissioning and DNO sign-off — is usually 4–8 weeks. Commercial installations take longer depending on system size and planning requirements.
Quick Answer
The physical installation of solar panels on a UK home takes 1–2 days. The full process including surveys, DNO approval, and MCS certification takes 4–8 weeks. Large commercial systems can take several months.
Full UK solar installation timeline
Get quotes (week 0)
Compare 3–4 quotes from MCS-certified installers. Most installers quote within 2–5 days of your enquiry. Some offer remote quotes using satellite imagery; others require a site visit.
Site survey (week 1–2)
If not done at quoting, the installer sends a surveyor to measure the roof, check the loft, inspect electrics, and confirm feasibility. Takes 30–90 minutes.
DNO notification (week 2–4)
For systems up to 3.68kW single-phase (or 11.04kW three-phase), the installer submits a G98 notification to your Distribution Network Operator after installation. Larger systems need G99 pre-approval before installation, which can take 3–8 weeks. See our DNO application guide.
Scaffolding (1–2 days before install)
Most UK installers erect scaffolding 24–48 hours before install day to meet working-at-height regulations.
Installation day(s) (1–2 days)
The actual panel mounting, inverter and battery fitting, and electrical connection usually takes 1–2 days for a residential system.
Commissioning (same day)
The installer tests the system, confirms it is generating, and configures monitoring. This typically happens at the end of install day 2.
MCS certificate (1–2 weeks post-install)
Your installer submits the installation details to MCS. You receive the MCS certificate within 1–2 weeks — this is required to apply for SEG payments.
SEG sign-up (week 6–8)
Once you have the MCS certificate and smart meter, register for the Smart Export Guarantee with your chosen energy supplier. Payments begin from sign-up date.
What happens on installation day?
On install day, an MCS-certified installer team (typically 2–3 people) will:
- Mount roof rails to rafters or battens
- Fix panels to the rails (typically 10–14 panels for a 4kWp system)
- Install DC cabling back to the inverter location
- Mount and wire the inverter (and battery if included)
- Install AC isolators, RCDs, and generation meter
- Commission the system and confirm generation
- Set up monitoring app and hand over the MCS paperwork
Your power may be switched off for 1–2 hours during the AC connection. Most of the day is work you can ignore from inside the house.
Why does the paperwork take so long?
UK solar installations are regulated by three bodies: MCS (installer certification), DNO (grid connection), and the energy supplier (SEG payments). Each has its own timeline:
- MCS certificate: 1–2 weeks after install
- DNO G98 notification (most homes): within 28 days after install
- DNO G99 pre-approval (large systems): 3–8 weeks before install
- SEG registration: 1–4 weeks after MCS certificate
See our MCS certification guide and DNO application guide for full detail.
Frequently Asked Questions
How long does it take to install solar panels on a house?
The physical installation takes 1–2 days on site for a typical UK home. The full process including quotes, surveys, paperwork, and DNO approval takes 4–8 weeks.
How long does it take to install a solar battery?
A solar battery is usually installed at the same time as the panels, adding 2–4 hours to the install day. Retrofitting a battery to an existing system typically takes half a day.
Do I need to be home during installation?
Yes, for at least the start of the first day and the commissioning. Someone needs to grant access and be present for the power interruption. You do not need to watch the whole install.
Can I install solar panels myself?
Technically yes for DIY kits, but you will not qualify for MCS certification, SEG payments, or 0% VAT. See our DIY solar panels guide for the trade-offs.
What can delay a solar panel installation?
Common delays: DNO G99 pre-approval for large systems (3–8 weeks), scaffolding availability, bad weather (most installers reschedule in rain or high winds), and stock shortages for specific panel or battery models.
Related Guides
Sources
- MCS — Installer Certification — mcscertified.com
- Energy Networks Association — G98 and G99 — energynetworks.org
Last updated: April 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
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