Solar Panel Installation Process: What Homeowners Can Expect From Quote to Switch-On

If you’ve been putting off looking into solar because it sounds complicated, you’re not alone. Most homeowners picture weeks of scaffolding, a parade of tradespeople, and a filing cabinet’s worth of paperwork. The reality is usually far less dramatic.

The physical installation – panels on the roof, inverter on the wall, system switched on – typically takes one or two days. The full process, from first enquiry to receiving your MCS certificate, usually runs 4-8 weeks. But most of that time is surveys, design work, grid paperwork, and scheduling. Not drilling.

What tends to catch people off guard isn’t the installation itself. It’s not knowing what’s coming next. So here’s what actually happens, step by step:

• What happens at each stage, from initial enquiry through to switch-on
• Where delays are most likely to occur and why
• What paperwork you should receive and who handles it
• What good aftercare looks like, and what questions to ask before you sign anything

Step 1: Getting a Quote and Initial Assessment

You get in touch, and the installer starts working out whether solar is a good fit for your home. Some do this remotely – satellite imagery, your electricity bills, a few questions about your roof – while others prefer to visit early if the property is more complex.

Either way, you’re not committing to anything at this stage. You’re just getting a quote, which typically arrives within 2-5 days of your enquiry.

What to have ready when you make contact

Nothing complicated. Having the following to hand will speed things up:

• A recent electricity bill (annual usage in kWh is what matters)
• The rough orientation of your roof (south, south-west, or east-west facing works best)
• Whether you’re interested in battery storage alongside panels
• Any known roof issues, such as recent repairs or unusual materials
• Whether you’re in a listed building or conservation area

You don’t need to know your system size or panel count at this stage. That’s the installer’s job to work out.

Step 2: The Survey and System Design

Once you’ve accepted a quote, someone comes out to take a proper look at your home. The survey is where everything gets confirmed: the condition of your roof, where the cables will run, the best spot for your inverter, and whether your consumer unit needs any attention.

It sounds more involved than it is. A standard residential survey takes around 30-90 minutes, and most of it happens in your loft and on your roof – not in your living room.

What gets decided at survey stage

• Panel layout and system size (finalised based on actual roof measurements)
• Inverter and battery location (usually in a garage, utility room, or loft)
• Cable routing from roof to consumer unit
• Whether any roof repairs are needed before installation can proceed
• Grid connection requirements – relevant if your system is larger than 3.68kW

When extra checks are needed

Most homes fall under permitted development rights, meaning no planning permission is required. However, if your property is a listed building, in a designated conservation area, or has a flat, hipped, or vaulted roof structure, the survey may flag additional requirements before a date can be confirmed.

Step 3: Scaffolding, Installation Day, and What to Expect at Home

This is the bit most people dread. In practice, it’s usually the smoothest part of the whole process.

Scaffolding goes up a few days before the installation – sometimes 24-48 hours ahead, sometimes 4-5 days if the installer is coordinating a busy schedule. It comes down within a few days of the work being done. You don’t need to be home for that part.

On the day itself, the team will need access to your roof, loft, and the room where your inverter will live. Most residential systems are finished within a single day.

One thing worth knowing: your electricity will be off for roughly 1-2 hours while the AC connection is made at the consumer unit. Your installer should flag when to expect this, so you’re not caught off guard mid-cup-of-tea.

Most homeowners are pleasantly surprised by how tidy the team leaves things. Still worth confirming expectations around waste removal and access routes before the day – just so everyone’s on the same page.

Step 4: Paperwork, Grid Notification, and Switching On

Good news: your system can usually start generating electricity on the day it’s installed. The paperwork is a different story – it takes longer, and it’s where homeowners are most often left feeling like they’re waiting for something they don’t fully understand.

Your installer should handle the technical submissions. But it helps to know what you’re waiting for and roughly when to expect it.

The SEG is how you get paid for surplus electricity you export to the grid. You apply to an energy supplier of your choice once you have your MCS certificate and export MPAN. Your installer should explain this process at handover, but the application itself is yours to complete.

Step 5: Aftercare, Monitoring, and What a Good Handover Looks Like

Here’s something worth knowing before you choose an installer: research by Citizens Advice found that while most homeowners are happy with their solar system overall, satisfaction drops sharply around handover, aftercare, and maintenance information. The panels go up fine. It’s what happens next that lets people down.

A proper handover should cover all of the following:

• Monitoring app setup – so you can track generation, consumption, and export in real time
• Warranty documentation – panel, inverter, and battery warranties registered in your name
• EIC and system schematic – your electrical safety certificate and a diagram of your system
• Manufacturer registration – some warranties require direct registration with the manufacturer
• Clear support contact – who to call if the system underperforms, trips, or develops a fault
• Export tariff guidance – how to apply for SEG and which suppliers are worth comparing

A monitoring app is particularly valuable in the first year. It lets you spot underperformance early, before a minor issue becomes a bigger one. If your installer doesn’t offer this as standard, ask about it directly.

For ongoing support after installation, the Project Solar customer support page covers documentation, warranty sharing, and how to get help if something needs attention.

Common Delays and Homeowner FAQs

What’s most likely to delay my installation? G99 pre-approval for larger systems (which can add 3-8 weeks), scaffold availability, roof repairs flagged at survey, and equipment lead times. Weather can nudge installation day by a few days, but it rarely derails the project entirely.

Do I need planning permission? Probably not. Permitted development covers most residential rooftop solar. The exceptions are listed buildings, some conservation-area properties, and certain ground-mounted systems – your installer should confirm this at survey stage.

Do I need to be home on installation day? Yes. Someone needs to be there for access, the brief power-off period, and the walkthrough at the end of the day. It doesn’t have to be a stressful day – most homeowners just get on with things while the team works.

When will my export payments start? Not straight away. You’ll need your MCS certificate and export MPAN before you can register for the Smart Export Guarantee. Realistically, allow 4-6 weeks after installation before everything is set up.

Ready to See What’s Possible for Your Home?

The fitting itself is rarely what people should worry about. What makes the solar panel installation process feel smooth – or stressful – is how clearly your installer communicates at every stage: before the survey, on installation day, and especially after the scaffolding comes down.

If you’re choosing between installers, use that as your filter. The process is well-established. What varies is how well each company manages your expectations along the way.

The best next step is a survey – that’s where your property-specific design, system size, and realistic timeline become clear. Book a solar survey or request a quote from Project Solar UK and we’ll walk you through every stage from there.

Written By Kitty Dawbarn