Scotland Regional Winner, Heating Installer Awards 2026Highly Commended, Scottish Energy Efficiency Awards 2025
🎉 Scotland Regional Winner at the Heating Installer Awards 2026
Scotland Regional Winner, Heating Installer Awards 2026Highly Commended, Scottish Energy Efficiency Awards 2025
🎉 Scotland Regional Winner at the Heating Installer Awards 2026
Home / Blog / Solar panel installation process
What it means for a Scottish home, from the engineers who fit them.
Sean Hogan · Heat Geek engineer · Updated October 2026 · 11 min read
Ask most Scottish homeowners what worries them about going solar and it’s rarely the technology. It’s the unknown: strangers on the roof for days, scaffolding blocking the light, holes drilled through walls you’ve just had replastered. The solar panel installation process is one of the more predictable jobs a trade will do to your house. It runs in a fixed order, every stage has a paperwork trail behind it, and once you know that order the anxiety mostly goes away.
This guide walks through what genuinely happens, in the order it happens: the survey, the DNO paperwork before anything touches the roof, scaffolding, the physical installation day, where the inverter and battery end up, testing and your MCS certificate, and what’s left once the crew has driven off. Nothing here is the abstract version. It’s the sequence as it plays out on a stone-built villa in the Central Belt or a semi on the East Lothian coast, weather delays and mess included.
How are solar panels installed, in one pass:
Each of those is a discrete stage with its own timescale, and none of them can be skipped or run out of order.
That ordering matters more than most guides admit. The paperwork stage, in particular, has to close out before the roof stage opens, because the DNO route your system needs can change how quickly the rest of the job can be scheduled. A straightforward domestic array across solar PV installation in Scotland usually moves through all of these steps without a hitch. The installation steps below cover each one in the order it actually happens, so you know what to expect before an engineer sets foot on your roof.
Nothing goes near your roof until two things happen: a solar panel survey confirms the design will work on your house, and the DNO paperwork is filed.
The survey covers roof orientation and pitch, shading from chimneys, trees or neighbouring buildings, and the condition of the roof covering itself. On a stone-built or slate Scottish property, that roof and structural check gets more attention than it would on a modern estate house. A typical rail-mounted residential array adds roughly 15 to 25 kilograms per square metre of dead weight once panels, rails, clamps and fixings are counted. Most Victorian and inter-war rafters carry that without any reinforcement, but a roof that’s already showing sag, rot or slipped slates gets flagged for a fuller structural assessment before anything is signed off. Tenement and sandstone villa roofs, and anything listed or in a conservation area, come with their own nuance; our guide to solar panels for period and listed homes in Scotland covers that in more depth.
Alongside the roof survey sits the DNO application, and this is where the paperwork genuinely can affect your dates. Scotland has two network operators, SP Energy Networks across the Central Belt and the south, and SSEN across the north, and every domestic array has to be notified to whichever one covers your postcode.
Most home systems, anything up to 3.68kW per phase, qualify for the fast-track G98 route: the installer switches the system on and notifies the DNO within 28 days, no waiting required before work starts.
Push past that threshold, usually with a larger array or one paired with a sizeable battery, and you fall under G99, which requires formal approval before installation begins. A standard G99 application allows the network operator up to 45 business days to issue a connection offer, and while a small domestic array often comes back well inside that, it can run longer where the local network needs reinforcement.
This is exactly why the DNO check happens at survey stage, before we ever quote you an installation week, so a G99 requirement gets built into the schedule rather than discovered as a surprise.
“After having several companies provide quotes for solar panels for my husband and me, Aventus ECO was by far the best.”
Kimberly Sloof, ★★★★★ Google Review
Working at height on a roof means safe access, and that means a scaffold platform, not a ladder propped against the gutter for two days.
Scaffolding solar panels on a bungalow is usually a lighter job than on a two-storey villa, sometimes a tower or podium scaffold rather than a full wrap, so it goes up faster and costs less. On a taller Victorian or Edwardian property, expect a proper scaffold around the working elevation, erected a few days before the fitting crew arrives so it’s fully checked and signed off for use. It doesn’t come down the moment the last panel is clipped in, either. Most jobs leave the scaffold standing for about a week after the fit, partly to allow a final check of the flashing and fixings in daylight, partly as a practical buffer if anything needs revisiting.
Scottish weather is the variable most installation guides skip. A scaffolder won’t erect access in high wind, and a scheduled scaffold day can slip 24 to 48 hours behind driving rain. Build that into your expectations for installation week rather than treating any delay as something going wrong.
Solar panel installation day starts early, usually with a van and trailer of panels parked on the drive and the crew up the scaffold before the ladders are fully secured. The first physical work is fixing roof hooks or standoffs through the tiles or slates into the rafters below, which is the part homeowners tend to picture correctly: yes, tiles come off, and yes, holes get made.
Two mounting methods cover almost every Scottish roof.
On-roof, the far more common choice on existing houses, fixes watertight hooks through the roof covering into the rafters, with aluminium rails clamped to the hooks and panels typically sitting five to ten centimetres proud of the roof surface. On a slate roof, each slate in the fixing line gets lifted individually, a standoff goes through the underlay onto the rafter, and the slate is reinstated around the bracket with lead flashing dressed in to keep the roof watertight exactly where it’s been penetrated.
In-roof or integrated systems, where the panels sit flush with the roof and the surrounding tiles come out entirely rather than staying in place around hooks, are less common on retrofits and trade a cleaner look for slightly lower efficiency from reduced airflow behind the panels.
Once the rails are up, the panels go on one at a time, clamped in place and wired together in strings. Cabling then runs, typically down through the loft space to a generation meter and consumer unit near your existing mains board, sometimes through a wall to a garage-sited inverter, with any external run in weatherproof conduit and the entry point sealed properly rather than left to a smear of silicone. Expect dust in the loft, tools and cable reels across the drive for the day, and the scaffold blocking a window or two while it’s up. Most straightforward domestic jobs finish the physical mounting and wiring in one to two days on-site, sometimes running to a third if the roof needs extra care or the weather intervenes.
“Aventus Eco installed solar panels and a battery and all went like clockwork. Now running virtually all day on a few £ of off peak electricity (Octopus) and the rest is solar feeding into the battery. Very pleased with the result and the thorough job done by Aventus Eco.”
Paul Prior, ★★★★★ Google Review
Where does the inverter go? Most commonly the loft, close to the cable run down from the roof, sited where there’s ventilation around it and enough clear space to get at it for future servicing. The linked smoke and heat alarm rules people associate with loft equipment apply to battery storage, not to a solar inverter on its own. A garage or utility room works just as well and suits houses where loft access is tight or the loft itself is already fully boarded and used.
Solar battery installation location is a separate decision with its own rules, and this is where garage versus loft placement genuinely matters. PAS 63100:2024, the British Standards specification covering fire protection for home battery storage, rules out voids, roof spaces and lofts:
It’s a good-practice specification rather than statute, but it’s the document a competent installer designs to, so the loft is off the table for batteries even though the inverter itself can still go there. Garages, utility rooms with proper fire separation, and dedicated plant spaces are the standard locations now, chosen for ventilation, ease of access for servicing, and distance from living space. In a garage the battery also has to sit clear of stored petrol, paint tins and gas bottles, which is worth knowing before you assume the obvious bit of wall is available. Where a battery sits alongside solar generation, our guide to solar battery storage in Scotland covers how the two work together once they’re both wired in.
Once the panels, inverter and any battery are physically connected, the system gets commissioned rather than simply switched on. Solar panel commissioning means the installer tests the array’s output against the design figures, checks earthing and RCD protection, confirms the inverter’s settings match the grid code, and records the results as part of the compliance paperwork. Those inverter settings are exactly what your network operator cares about, which is why commissioning day and the G98 notification to SP Energy Networks or SSEN sit right next to each other in the paperwork trail rather than weeks apart.
That paperwork ends with your MCS certificate, and this is the document that matters more than anything on a brochure. MCS certification is what confirms the installation meets the recognised technical standard, and it’s the single piece of paper that everything downstream depends on.
The MCS certification timeline is fixed by the scheme itself: your installer has to register the completed system and issue your certificate within 10 working days of commissioning.
It’s not something you chase; it’s something a properly run install produces as a matter of course.
“Sean with Aventus Eco came out and walked us through the entire process of solar panels from start to finish, and we are so chuffed with the results.”
Amy C, ★★★★★ Google Review
Your MCS certificate is the key that unlocks Smart Export Guarantee registration, the scheme that pays you for the electricity your system sends back to the grid.
Three things make you eligible:
The first two should be in place by the time commissioning is finished.
The third one you sign yourself. A SEG tariff is a contract between you and your chosen electricity supplier, so it can’t be entered on your behalf by an installer, and rates differ enough between suppliers that it’s worth choosing rather than defaulting. What a properly run handover does is put the MCS certificate, the system details and the export meter confirmation in your hands, so the application is form-filling rather than a research project. The full mechanics of comparing export tariffs and picking the right rate for your household live in our dedicated guide to the Smart Export Guarantee in Scotland; the point worth knowing here is simply that the certificate from your install is what makes you eligible in the first place.
As a general guide, a straightforward domestic job on the G98 fast-track route runs roughly four to eight weeks from your first enquiry to export-ready, though every installer’s backlog and every roof’s complexity shift that figure.
The survey is usually booked within a couple of weeks of first contact.
Scaffolding and the installation slot itself typically follow another few weeks out, longer in spring when demand for solar work across Scotland peaks.
The physical fitting takes one to three days once the scaffold is up.
Your MCS certificate follows within 10 working days of commissioning, and SEG registration comes after that.
A G99 requirement, a listed building consent process, or an unusually complex roof all add weeks on top of that baseline, which is exactly why those checks happen at the survey stage rather than being discovered halfway through a job.
Book a £0 engineer-led survey and get answers based on your actual home, not national averages.
You speak to the person who would design your system.
“Great experience from start to finish, excellent customer service and a job well done!”
Dee Kay, ★★★★★ Google Review
As a rough guide, a straightforward home install runs four to eight weeks from enquiry to export-ready, with the physical fitting itself taking one to three days once scaffolding is up. G99 approval, listed building consent or a complex roof can extend that.
On almost every pitched roof, yes. Safe access at height requires a proper scaffold platform, though a single-storey bungalow often needs a lighter tower scaffold rather than a full wrap, which goes up and comes down faster.
For most home systems, no. Anything up to 3.68kW per phase qualifies for the fast-track G98 route, notified after the system is switched on. Larger arrays need G99 approval first, which can take up to 45 business days and does affect your schedule.
In almost every case, yes. A typical array adds roughly 15 to 25 kilograms per square metre including rails and fixings, which most Scottish rafters carry without reinforcement. The structural check at survey stage confirms it for your specific roof, particularly on older stone-built or slate properties.
Roof hooks or standoffs go in through the tiles or slates into the rafters, rails and panels are fixed and wired, cabling is run to the inverter and consumer unit, and the array is tested. Most straightforward jobs finish the physical work in one to two days.
Your installer has 10 working days from the date your system is commissioned to register it and issue your MCS certificate, which is the document that makes you eligible for the Smart Export Guarantee.
Partly. The SEG tariff is a contract between you and a licensed supplier, so the application goes in under your name. Your installer’s job is to hand over the MCS certificate and system details the supplier asks for, which is what makes the application quick.
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