Can I Install Solar Panels Myself?
Author: Steve Fairless
Originally Published: 14th January 2024 · Updated: 29th August 2026
It is not automatically illegal for a homeowner to carry out solar work, but a conventional grid-connected rooftop PV installation is a poor candidate for casual DIY. It combines dangerous work at height, live DC electrical hazards, structural loading, weatherproofing, Building Regulations, BS 7671 requirements, DNO connection rules and certification. In England, installing a new electrical circuit is notifiable work under Part P. For SEG on PV up to 50kW, Ofgem expects suitable certification of the installation and installer, normally MCS or an equivalent recognised route.
At Sustainable Energy Engineering, we do not treat solar as a panel-fixing exercise. The panels are only one part of a generation system that must remain electrically and structurally safe for decades.
Updated: 29th August 2026, including the new Great Britain plug-in solar rules that came into effect on 27th August 2026.
DIY Solar: What You Need to Know
- Roof work is high risk; HSE says almost one in five construction deaths involve roof work.
- Part P applies to electrical installations in dwellings and specifically includes rooftop PV and garden electrics in its scope.
- In England, installing a new circuit is notifiable work.
- MCS MIS 3002 requires competent personnel, risk assessment, BS 7671 compliance and G98/G99 DNO procedures for certified installations.
- For SEG on PV up to 50kW, Ofgem asks for suitable installer and installation certification, normally MCS or equivalent.
- The new plug-in solar route is different: from 27 August 2026, Great Britain allows small kits up to 800W under a separate regime.
Is DIY Solar Illegal?
No single rule says “a homeowner may never touch solar”. The real issue is that different parts of a full installation are regulated in different ways, and competency still matters.
For example, England's Approved Document P says all electrical installation work in a dwelling is subject to the Part P safety requirement. It specifically includes photovoltaic panels on roofs and fixed garden electrics within scope. Installing a new circuit is listed as notifiable work.
If you are not using a registered competent person route, building-control or registered third-party certification procedures can be required. That is very different from fitting a shelf or replacing a plug.
Why Solar Is an Unusual DIY Risk
Solar combines hazards that usually belong to separate trades. Current MCS MIS 3002 highlights the combination of electric shock, falling and manual-handling risk. A roofer may understand fall protection but not live DC circuits; an electrician may understand electrical isolation but not the handling of large modules on a roof.
Work at height
Safe access, edge protection, fragile surfaces and weather conditions all matter. A short job is not a low-risk job.
DC electricity
PV strings can remain energised whenever modules are illuminated. Incorrect connectors, polarity, isolation or cable management can create shock and fire risks.
Roof structure
The mounting system imposes permanent and wind loads. Fixings must suit the structure and must not compromise weather-tightness.
Grid connection
The inverter cannot simply be connected without considering G98/G99, DNO notification/application and the aggregate output of other generation or storage.
What Does HSE Say About Roof Work?
HSE's current guidance is unambiguous: all roof work is highly dangerous, even when the task only takes a few minutes. It says work must be properly planned and those carrying it out must be trained, competent and instructed in the precautions required.
HSE also states that almost one in five deaths in construction work involve roof work. That is a much stronger reason to avoid improvised access than the possibility of damaging a panel.
Part P: Why the Electrical Side Is Not “Just Connect the Inverter”
In England, Approved Document P requires reasonable provision to protect people from fire or injury. It also says new electrical work should be carried out in accordance with BS 7671.
Most conventional domestic PV projects involve a dedicated AC connection/circuit. Part P lists installation of a new circuit as notifiable. The approved document gives three certification routes for notifiable electrical work:
- self-certification by a registered competent person;
- certification by a registered third-party certifier; or
- certification through building control.
Rules differ across the devolved nations, so this specific Part P process is an England example rather than a claim that every UK nation administers electrical work identically.
MCS Is More Than a Badge
The current MCS Solar PV Standard, MIS 3002 Issue 6.0, became mandatory for MCS contractors on 18th June 2026. It covers supply, design, installation, set-to-work, commissioning and handover.
It requires the contractor to have competency and capacity, conduct risk assessments, address Building Regulations, follow BS 7671 and use the appropriate G98/G99/G100 network process.
For a permanent domestic solar PV installation, those controls are part of the value of professional installation.
G98 and G99: The Grid Rules Do Not Disappear for DIY
Energy Networks Association guidance uses G98 for smaller generation up to and including 16A per phase. The guide equates that to 3.68kW on a single-phase supply and 11.04kW on a three-phase supply for aggregate generation.
Above that threshold, G99 applies. If batteries or other generators are operating in parallel, their aggregate AC output can affect the route. MCS explicitly calls this out.
Do Not Size the Array Around “3.68kW” Without Understanding the Inverter
The network threshold relates to AC generation/current, not simply the sum of panel nameplate watts. Oversizing a DC array relative to an inverter is common in professional design, so a panel-count shortcut can lead to the wrong connection conclusion.
What Happens to SEG if You DIY?
Ofgem's SEG generator guidance says PV, wind and micro-CHP installations up to 50kW must demonstrate that the installation and installer are suitably certified. An MCS certificate is the normal route, although Ofgem recognises equivalent certification in specified circumstances.
So the old statement “DIY can never get SEG” is too absolute, but the practical problem remains: a self-installed system has to satisfy the supplier's evidence requirements through a recognised equivalent route if it does not have MCS certification.
What About Product Warranties and Insurance?
Warranty conditions differ by manufacturer, and insurers/lenders can have their own requirements. Do not assume a product warranty covers faults caused by incorrect mounting, connector assembly, cable routing or non-compliant electrical work.
Before a DIY project, you would need to check the exact warranty, home-insurance and mortgage conditions rather than rely on a generic claim that “DIY voids every warranty”.
Can I Do the Mechanical Work and Hire an Electrician Later?
That can still create problems. The electrical professional is then being asked to take responsibility for a system whose structural fixings, DC cable routes, connectors, module bonding, isolator placement and fire/roof details were selected by somebody else.
A competent installer may decline to certify work they did not design or supervise. If you want a split-scope project, agree responsibilities before work starts rather than after panels are already fixed to the roof.
Does the New Plug-In Solar Rule Change the Answer?
Yes for Small Plug-In Kits — No for Conventional Rooftop Solar
From 27th August 2026, Great Britain introduced a separate legal route for plug-in solar kits up to 800W. Government describes these as easy-to-install panels that connect through a mains socket under tailored safety rules.
That change should not be extrapolated to a conventional 4–10kWp rooftop system. A multi-kilowatt array with dedicated inverter, fixed wiring and DNO connection remains a fundamentally different installation.
Where DIY Solar Can Make More Sense
Small off-grid educational systems, low-voltage hobby projects or the new compliant plug-in category can be very different from a permanent grid-connected roof array. The consequences of an error are lower when the system is specifically designed for user installation and falls within the applicable product/connection rules.
Even then, follow the manufacturer's instructions and any network-registration requirements for the specific product.
What Professional Installation Should Give You
| Area | DIY risk | Professional process |
|---|---|---|
| Roof access | Improvised ladders/access and fall exposure | Planned access, scaffolding/edge protection and risk assessment |
| Structural design | Fixing into unknown roof structure | Roof assessment and manufacturer-compatible mounting design |
| Electrical design | Connector, cable, protection and isolation errors | BS 7671 / PV-code design, inspection and testing |
| DNO | Wrong G98/G99 assumption or late application | Connection route considered before commissioning |
| Performance | Panel count chosen without shading/yield model | Annual generation and self-consumption estimates |
| Handover | Incomplete records | Commissioning, test results, manuals and certificates |
Why “Saving the Labour Cost” Can Be a False Economy
The labour component is paying for more than someone carrying panels up a scaffold. It includes survey, design, risk controls, mounting, DC/AC electrical work, testing, DNO process, commissioning, certification and handover.
If a DIY installation later needs remedial work to achieve compliance or reliable performance, the cost of access and diagnosis can remove much of the initial saving.
Our Recommendation
For a permanent grid-connected domestic system, we recommend professional design and installation. If you want to understand what is involved before deciding, our engineering team can explain the survey, design and compliance process without pretending the only issue is panel price.
If you are in the North East and want a properly scoped system, request a solar quotation based on your roof, annual consumption and future energy plans.
