How Solar Panels Are Installed in the UK (2026 Guide)

Working out how solar panels actually get onto your roof is one of those things nobody explains properly before you sign. You get a quote, you get a sales pitch, and then a van turns up one morning. This guide fills the gap in between.

Here’s the honest version of what happens, from the first survey to the moment your system switches on. The good news is that most home installs are quicker and less disruptive than people expect – the panels themselves usually go up in one to two days. The paperwork and planning around that day is where the real work sits, and knowing how it works puts you in control.

We’ll walk through the full process step by step, how long each part takes, what you need to sort before the installers arrive, and the legal boxes that have to be ticked. We’ll also cover the things most guides skip – like what to ask before you sign, how to spot a dodgy installer, and what “commissioning” actually means when it appears on your quote.

Survey day vs installation day: they’re not the same

First thing to clear up, because it trips people up: you’ll have at least two separate visits, and they do very different jobs.

Why does the difference matter? Because a proper survey is your early warning system. A good installer will tell you at survey stage if your roof needs repairs, if shade is a problem, or if your fuse box needs upgrading – before you’re committed. If a company tries to skip the survey and go straight to fitting, that’s a red flag. The survey is where problems get caught cheaply, rather than discovered halfway through the install when the scaffolding’s already up.

What happens before installation day

Plenty goes on between signing your contract and the van arriving. Here’s the run of it.

• System design. Using the survey, the installer designs your exact layout – panel count and position, inverter location, cable routes and battery position. This is where your quote turns into a real plan.
• Ordering the kit. Your panels, inverter, mounting rails and any battery get ordered in. Lead times vary, and this is often what sets your install date.
• DNO notification. Before anything connects to the grid, your Distribution Network Operator has to know. For most home systems your installer sorts this.
• Scheduling and scaffolding. You agree a date, and scaffolding typically goes up a few days beforehand. It stays until after sign-off, so expect it around longer than the install.
• Any prep work. If the survey flagged roof repairs or a consumer unit (fuse box) upgrade, that usually needs sorting before or on the day.

The whole sequence, from signing to switch-on, often takes a few weeks. The fitting is quick; it’s the ordering and scheduling that fills the calendar.

The full installation process, step by step

This is the part you came for. Here’s exactly what happens once the work begins, in order.

1. Scaffolding goes up. Safety first on any pitched roof. It usually arrives a few days before the fitters, giving safe access to work at height. This is included in a proper quote – if scaffolding is listed as a vague “extra,” ask for a firm figure.
2. Fitting the mounting system. The first roof job is the metal rails and roof hooks your panels bolt onto. The fitters lift a few tiles, attach brackets securely to your rafters, then refit the tiles around them. Done right, it’s weather-tight and won’t leak for decades.
3. Installing the panels. Once the rails are solid, the panels clamp onto them, angled for the best generation your roof allows. On a typical 10-panel home this stage moves fairly quickly – it’s the mounting and wiring that take the real care.
4. Installing the inverter. The inverter is the brain of the system, converting the DC electricity your panels make into the AC your home uses. It’s a box, usually in your loft, garage or on an outside wall – somewhere cool and accessible.
5. Wiring and electrical connections. A qualified electrician runs cabling from the panels to the inverter, then into your consumer unit, fitting safety devices, isolation switches and often a generation meter. This must meet UK wiring regulations – not a corner anyone can cut.
6. Fitting a battery (if chosen). Battery storage usually goes in during the same visit, adding a few hours or up to a day. It’s cheaper and tidier than a separate job later.
7. Commissioning. The formal testing and switching-on. The installer powers everything up, runs safety and performance checks, confirms the panels, inverter and battery all talk to each other, and sets up monitoring. Think of it as the final MOT before the system is officially live.
8. Handover. The fitters walk you through the system, show you the monitoring app, explain the inverter’s signals, and hand over your paperwork – then clean up and clear out. Your scaffolding usually comes down a few days later.

How long does it all take?

For most homes, the actual fitting takes one to two days. A straightforward install on a simple pitched roof with a standard system can be done in a single day – fitters arriving in the morning, finished by mid-afternoon. Two days is common once you factor in a larger system or a bit of roof complexity. Some jobs run longer:

• A larger system with more panels takes more time to mount and wire.
• Complex, steep or hard-to-access roofs slow the fitters down.
• Adding a battery on the same visit adds hours or a day.
• Electrical upgrades, like a new consumer unit, add time.
• Poor weather can pause roof work for safety.

Remember the fitting is only part of the timeline. Once you add scaffolding going up and coming down, plus the weeks of ordering and scheduling, the full journey from signing to switch-on is usually a few weeks.

Do you need to be home?

Yes – at least for the beginning and the end. The installers need access to your roof, loft and consumer unit, and someone needs to confirm final positions for the inverter and battery. There’s also the handover, where they show you how everything works. You don’t have to hover all day – once they’re set up, the middle of the job is theirs. But plan to be around at the start and for the final walkthrough.

The DNO notification, explained simply

This sounds like red tape, and it sort of is, but it’s important and easy to understand once you strip out the jargon. DNO stands for Distribution Network Operator – the company that owns and runs the electricity network in your area (different from your energy supplier, who just bills you). When you install solar, you’re potentially feeding power back into the grid, so the DNO needs to know to keep the local network stable and safe. There are two ways it works, depending on system size.

• Smaller systems (most homes): your installer notifies the DNO after the install, under a “connect and notify” arrangement. You can switch on without waiting.
• Larger systems: you may need DNO approval before installation, which can add time.

For a typical home setup, your installer handles the DNO paperwork – but it’s ultimately your responsibility to make sure it’s done. Ask them to confirm it’s sorted, and keep a copy. Skipping it isn’t an option: an unregistered system can cause problems for you and the network, and it can block you from getting paid for the power you export.

MCS and Flexi-Orb certification: why it matters

If you take one thing from this guide, make it this. Use an installer certified by MCS or Flexi-Orb, and don’t budge on it. MCS – the Microgeneration Certification Scheme – is the UK’s quality mark for small-scale renewables like solar. Flexi-Orb is a second scheme meeting equally high standards, and it’s accepted by most export-payment providers. A certified installer has proven they meet strict technical standards, use approved products, run a proper business, and belong to a consumer protection code.

• Export payments. To get paid for solar you send back to the grid through the Smart Export Guarantee, your system almost always needs MCS or Flexi-Orb certification. That’s worth hundreds a year – lose the certificate, lose the income.
• Quality and safety. Certification means the job was done to a recognised standard, with kit that’s been properly tested.
• Warranties. Many manufacturer warranties require certified installation to stay valid.
• Home value. A certified system is easier to prove and sell on when you move.

Checking is simple. Search the installer’s name on the MCS “Find an Installer” tool before you sign, and check again just before work starts to make sure their certification is still current. An installer without MCS or Flexi-Orb isn’t worth the risk, however good their patter or cheap their price.

What’s actually in the MCS certificate and handover pack

Another thing rarely spelled out: what paperwork you should walk away with. The MCS certificate should reach you within 10 working days of the job finishing. It’s the official record that your installation was done by a certified installer using certified products, confirming your system size and expected generation – and you’ll need it to sign up for export payments, so keep a digital copy. The handover pack, handed over on the day, is your system’s instruction manual and warranty file rolled into one. A proper pack includes:

• Product details for your panels, inverter and battery.
• Your workmanship warranty from the installer.
• A simple maintenance guide.
• Basic troubleshooting – what the inverter’s lights and signals mean.
• System performance and generation estimates.
• Wiring and system diagrams.

If either doesn’t turn up, chase it. The MCS certificate in particular is your key to export income.

Planning permission: do you need it?

Good news for most people: you almost certainly don’t need planning permission for standard roof-mounted solar. It counts as “permitted development,” meaning it’s pre-approved as long as it’s within normal limits – panels sitting reasonably close to the roof slope and not sticking up dramatically. The exceptions are worth knowing:

• Listed buildings – you’ll likely need consent, and panels may have to sit where they can’t be seen from the street.
• Conservation areas – extra rules often apply, especially on street-facing roofs.
• National parks and World Heritage Sites – similar restrictions.
• Flats and maisonettes – can have different rules.

If any apply, a quick call to your local council planning office settles it, and a good installer will flag it during the survey. When in doubt, check before you order anything – it’s a five-minute call that saves a lot of grief.

Roof requirements: is your home suitable?

Most UK homes work fine for solar, but a few factors decide how well.

• Direction. South-facing is the gold standard, but east and west-facing roofs still work well, just producing a bit less. North-facing alone is the one to avoid.
• Pitch (angle). The sweet spot is a 30 to 40 degree slope, which happens to be the angle of most UK roofs – the surveyor measures this, not you.
• Space. A standard system needs roughly 15 to 20m² of roof – enough for around 10 panels. More space means more generation.
• Shade. Shade from chimneys, trees or nearby buildings cuts output, sometimes sharply. A good survey checks where shadows fall across the day and seasons.
• Condition. Your roof needs to be sound enough to carry the panels for 25-plus years. If it needs repairs, sorting that first saves taking panels off later.

Don’t have a suitable roof? Solar can also go on a flat roof, a garden frame, or an outbuilding like a garage – so a tricky main roof doesn’t rule you out.

Flat roofs: what’s different

Flat roofs are entirely doable, with a couple of differences. Panels can’t lie flat – they’d generate poorly and never rain-clean themselves – so they’re mounted on angled frames that tilt them toward the sun, either ballasted (weighed down) or fixed to the roof. The trade-offs: flat-roof panels tend to need a bit more cleaning, since they don’t get the same rain run-off, and frame mounting adds a little to the cost. Not every installer offers flat-roof work, so check before you get too far down the line.

What it costs

Prices vary with system size, panel choice and whether you add a battery, but here’s the realistic range for 2026. A typical home solar system costs between £5,800 and £10,000 installed. As a rough guide, a common setup for a three-bedroom house lands around £7,000 to £8,000 – and that price should include the panels, inverter, all mounting, scaffolding, wiring, certification and the surveys.

• System size – more panels cost more, but the price per panel drops as you scale up.
• Panel type and style – discreet “in-roof” panels or premium brands cost more than standard on-roof panels.
• Roof complexity – steep, tall or awkward roofs mean more scaffolding and labour.
• Battery storage – a battery is a separate cost on top, often £3,000 to £6,000 depending on size.

Can you install solar yourself?

Technically, if you’re a qualified electrician, yes. For everyone else, the honest answer is don’t – and here’s the straight reasoning, not just a warning.

• You can’t get it certified. A DIY install can’t receive MCS or Flexi-Orb certification, which means no export payments – you’d throw away hundreds a year in income before you start.
• The legal requirements are real. Solar electrical work must be done by a certified electrician, comply with the 18th Edition IET wiring regulations, and meet Part P of the building regulations.
• The risks are serious. You’re working at height, with electricity, on your own roof. Get the mounting wrong and you get leaks; get the wiring wrong and you risk fire or shock – and can invalidate your insurance and void warranties.

Once you factor in the lost export income, the warranty risks and the safety exposure, the modest saving on labour isn’t worth it. Use a certified professional and keep both your money and your peace of mind.

Adding a battery: do it on the same day?

A battery stores the solar you generate in the day so you can use it in the evening, instead of buying pricier grid power. Paired with a smart tariff, it’s where a lot of the real savings live – but it’s a meaningful extra cost, usually £3,000 to £6,000 on top of the panels.

On balance, fitting the battery during your solar install is the smart move if you know you want one. It’s cheaper than a separate visit, the wiring and inverter setup are already being done, and you avoid a second round of disruption. The downside is a slightly longer install and a bigger upfront bill.

What to ask before you sign

Most guides tell you the process. Few tell you how to protect yourself. Run through these before you commit to any installer.

• “Are you MCS or Flexi-Orb certified?” Then check it yourself on the MCS website. Non-negotiable.
• “Is scaffolding included, and at what cost?” It should be in the quote as a firm figure, not a vague extra.
• “Who does the electrical work, and are they a certified electrician?” Some firms subcontract – you’re entitled to know who’s in your home.
• “Will you handle the DNO notification?” For most homes they should, but confirm it.
• “What warranties do I get?” Ask about the panels, inverter, battery, and the installer’s own workmanship warranty separately.
• “Will you carry out a proper shade survey?” If they wave this off, be wary.
• “Does my consumer unit need upgrading?” Better to know now than as a surprise cost on the day.
• “When will I get my MCS certificate and handover pack?” The certificate should arrive within 10 working days.

A confident, certified installer will answer all of these without flinching. Hesitation or vagueness is your cue to get another quote.

How to spot a bad installer

Trust the process, not the pitch. The best installers explain things clearly, welcome your questions, and never rush you.

What to do after installation

The van’s gone, the panels are on – a few loose ends to tie up.

• Sign up for the Smart Export Guarantee (SEG). This is how you get paid for the solar you send back to the grid. You apply directly to an energy supplier offering an SEG tariff – and they don’t have to be your current supplier, so shop around for the best rate. You’ll need your MCS certificate.
• Store your paperwork. Keep your MCS certificate and handover pack safe, with digital copies. You’ll want them for export payments, warranty claims, and when you sell.
• Get to know your monitoring. Watching your app for a week or two teaches you when your panels produce most – so you can run the washing machine, dishwasher or immersion heater in daylight and use free solar.
• Keep it lightly maintained. Solar is low-maintenance. Keep panels reasonably clean, shade trimmed back, and follow the checks in your handover pack. The inverter is the part most likely to need replacing across the system’s 25-plus year life.

Frequently asked questions