How Are Solar Panels Installed? Step by Step
Wondering what actually happens when you get solar? Here’s the full UK process, step by step — survey, scaffolding, mounting, wiring, commissioning — what happens on the day, and how long it all takes.
The short answer
Solar panels are installed in a clear sequence: survey → design & quote → scaffolding → mount the rails → fit the panels → install & wire the inverter → test & commission → connect to the grid → paperwork. The physical work on your roof usually takes 1–3 days (the Energy Saving Trust says 1–2 is typical), carried out by a team of a roofer and two electricians. Crucially, installers don’t drill through your roof’s waterproof membrane — they hook the mounting to the rafters beneath the tiles, so your roof stays watertight. This guide follows the Energy Saving Trust and MCS installation guidance.
The one thing to understand: while the on-roof work is quick, the full project — from enquiry to a fully signed-off, generating system — takes around 4–8 weeks. Most of that isn’t installation; it’s the survey, equipment lead time, scaffolding, DNO grid approval and MCS paperwork. This guide walks through every step of exactly what happens, what to expect on the day, and how to prepare. (For the timeline in depth, see our how long does installation take? guide.)
What this guide covers
Getting solar can feel like a mystery — roof surveys, scaffolding, inverters, DNO approvals and paperwork all sound technical. But the process is genuinely straightforward once each step is laid out. Here’s exactly how solar panels are installed on a UK home in 2026, from first enquiry to switch-on.
The full process, step by step
The 9 steps of a solar installation
1. Survey. An initial desktop/satellite assessment gives a rough quote; then a physical technical survey (30–60 mins) checks your roof’s condition and structure, your electrics, and any shading.
2. Design & quote. The installer designs a system for your roof and usage, and gives a detailed quote — panels, inverter, mounting, cabling, with 0% VAT applied. (Get 3 quotes to compare.)
3. Order & lead time. Once you approve, the equipment is ordered — typically a 2–4 week lead time.
4. Scaffolding. Erected a day or two before the install, for safe working at height (takes about a day).
5. Mounting. The team fixes roof hooks or brackets to your rafters and bolts mounting rails to them — without penetrating the roof membrane (more below).
6. Panels & inverter. Panels are clamped onto the rails and DC-wired; the inverter is fitted (loft or garage) and connected, plus a battery if included.
7. Wiring. The AC cable is routed to your consumer unit/meter, and the system is earthed.
8. Testing & commissioning. Full electrical testing and safety checks, then connection to the grid — at which point it starts generating.
9. Sign-off & paperwork. You get your MCS certificate (5–10 days), DNO grid registration, warranties and handover docs, plus SEG tariff setup.
What happens on installation day
Installation day is the main event, and most homeowners are pleasantly surprised how quick and tidy it is. Your team — typically a roofer and two electricians — arrives early with all the kit. They’ll reassess and plan the day, then get to work: fixing the mounting brackets and rails to the roof, lifting and clamping the panels into place, and running the wiring from the panels down to the inverter. Meanwhile the inverter is installed in your loft or garage and connected to your consumer unit, along with a battery if you’re having one. The power may be turned off briefly while they connect to your fuse box. On the first day, they’ll want to agree the cable route with you — where the cable runs from the inverter to your electricity meter — so it’s worth being home. For most systems this is a 1–2 day job; larger or more complex roofs take a little longer. It’s disruptive only in the sense of having scaffolding up and a team on the roof — inside your home, the impact is minimal.
Do installers drill through your roof?
No — and this reassures a lot of worried homeowners
A very common worry is whether solar installation risks damaging your roof or causing leaks. The reassuring answer: a properly-done installation does not penetrate your roof’s waterproof membrane. Rather than drilling through the roof covering, installers use a mechanical fixing method: they lift the tiles or slates, attach roof hooks or brackets directly to the rafters (the structural timbers beneath), then refit the tiles over them. The mounting rails bolt to these hooks, and the panels clamp to the rails. The waterproof layer stays completely intact — everything is fastened to the structure, not screwed through the surface. For slate roofs, installers use specific slate hooks and take extra care (slate is more brittle). This method is standard practice and required by the MCS installation standard — which is one reason an MCS-certified installer matters. If anyone quotes an install that drills straight through the roof covering, that’s a red flag. Done right, your roof is left watertight, with the panels firmly anchored to the rafters.
How long it all takes
Two timeframes matter here. The physical installation — the disruptive, on-your-roof part — is quick: 1–3 days for most homes (the Energy Saving Trust cites 1–2 as typical), or sometimes a single day for a straightforward 8–14 panel system. But the full project — from first enquiry to a signed-off, generating system — typically takes 4–8 weeks. The gap is because most of the time isn’t installation; it’s the survey, equipment lead times (2–4 weeks), scaffolding, DNO grid approval, scheduling and MCS paperwork. So set your expectations accordingly: the roof work is brief, but plan for a month or two overall. Scaffolding usually goes up a day or two before and may stay up a week or two after for final checks. Weather can cause short delays, as roof work pauses for heavy rain or high winds. For the full timeline breakdown, see our dedicated how long does solar installation take? guide.
How to prepare for installation day
A few simple things help it go smoothly:
- Clear access to your loft/roof space, consumer unit (fuse box), meter, and cable routes between them — move stored items from around the loft hatch and fuse box.
- Make space for scaffolding around the relevant part of the roof — move cars, bins and garden items.
- Be home on day one — the team will explain the process and agree the cable route from inverter to meter (which affects where any visible cabling runs indoors).
- Secure pets away from work areas.
- Know where your consumer unit and main fuse are, and have your paperwork to hand.
You don’t need to touch the roof yourself — that’s the installer’s job. Beyond the above, the process is designed to be low-hassle, and a good installer keeps disruption minimal and tidies up thoroughly. Raise any concerns (parking, access, working hours) in advance.
After installation
Once the system is commissioned and connected, it starts generating immediately — you’re using your own solar power from that moment. In the days after, your installer sends the paperwork: the MCS certificate (usually 5–10 working days — you need this to claim the Smart Export Guarantee), DNO grid registration confirmation, product and workmanship warranties, and a handover pack. You’ll be shown your monitoring app to track generation and (if fitted) battery use. Then it’s remarkably low-maintenance: UK rain keeps panels reasonably clean, and a professional check every 5–10 years is all that’s typically needed. Do set up your SEG export tariff once you have your MCS certificate, to get paid for the electricity you export. And keep all your paperwork safe — you’ll want it for warranties and if you ever move house.
Frequently asked questions
How are solar panels installed, step by step?
Survey → design & quote → order (2–4wk) → scaffolding → mount rails to rafters → fit & wire panels → install inverter → wire to consumer unit → test & commission → connect to grid → MCS/DNO paperwork. Physical work is 1–3 days (a roofer + 2 electricians); the full project is ~4–8 weeks including paperwork.
How long does installation take?
The physical fitting is 1–3 days (1–2 typical per the Energy Saving Trust); a simple system can be a single day. But the full project — enquiry to signed-off — is ~4–8 weeks, most of it survey, lead times, DNO approval and paperwork rather than installation. See our how long does it take? guide.
Do installers drill through the roof?
No — a proper install doesn’t penetrate the waterproof membrane. Installers hook brackets to the rafters beneath the tiles/slates and refit the tiles over them; rails bolt to the hooks, panels clamp to the rails. The roof stays watertight. This is standard MCS practice — drilling through the covering is a red flag. See our slate roof guide.
How do I prepare for installation day?
Clear access to your loft, consumer unit and meter; make space for scaffolding (move cars/bins); be home on day one to agree the cable route; secure pets. You don’t touch the roof — that’s the installer’s job. Raise any parking or access concerns in advance.
Who carries out the installation?
Typically a team of a roofer and two electricians from your MCS-certified installer. The roofer handles the mounting and panels; the electricians wire the inverter, consumer unit and testing. Always use an MCS-certified installer — it’s required to claim the SEG and ensures the job meets the proper standard.
When can I start using the solar power?
Immediately on commissioning — the moment the system is tested and connected to the grid, it generates and you use your own solar. To get paid for exported electricity via the Smart Export Guarantee, you need your MCS certificate (issued 5–10 days after), then sign up with an SEG provider.
The bottom line
Installing solar panels is a well-established, straightforward process that’s far less disruptive than most people expect. The physical work — surveying, scaffolding, mounting the rails, fitting the panels, wiring the inverter, testing and connecting to the grid — is done by a small team of a roofer and two electricians in just 1–3 days, and crucially, a proper installation doesn’t drill through your roof’s waterproofing, so there’s no leak risk. The moment it’s commissioned, you’re generating your own electricity.
The one expectation to set is the overall timeline: from first enquiry to a fully signed-off system is around 4–8 weeks, most of it survey, lead times, DNO approval and MCS paperwork rather than installation. And the whole thing starts with a single step — a survey of your roof. A couple of free, no-obligation home surveys from MCS-certified installers will assess your home, design the right system, and walk you through exactly what your installation would involve — so you know precisely what to expect before committing.
Important
Going Solar UK is an introduction service, not an installer. This guide gives general 2026 information on the solar installation process for research: exact steps, timings and methods vary by property, roof, system and installer, and the figures here are typical estimates, not guarantees. Installation must be carried out by a qualified, MCS-certified installer following the MCS installation standard. Always get a professional survey and itemised quotes from MCS-certified installers before proceeding.
We may receive a commission when we introduce you to an installer, at no cost to you. Any contract for work is directly between you and the installer.