Can I Install Solar Panels Myself? UK Rules Explained

The question comes up constantly in solar forums: can I just buy the panels, hire a couple of mates, and put them up myself? The answer is more nuanced than a simple yes or no. There are things you can legally do yourself, things you cannot do without a qualification, and a significant financial consequence to weigh up. Here is the full picture.

The short answer

Physically mounting solar panels on your roof, in your garden, or on a frame — yes, this is legal to do yourself. There is no law preventing you from fixing panels and a mounting system to your own property.

Connecting that system to your home's electrical circuits — no, not without either being a qualified electrician or getting the work signed off through building control. This is covered by Part P of the Building Regulations in England and Wales, which requires that work on electrical installations in dwellings is either carried out or certified by a competent person.

What you can do yourself

Physical mounting and equipment purchasing

You can legally:

• Design your system layout — deciding how many panels, where they go, and what angle
• Source and purchase your own equipment (panels, inverter, mounting rails, cables, connectors)
• Install the mounting system (rails, brackets, roof hooks) on your roof
• Place and fix the panels to the mounting rails
• Run the DC cabling from the panels down to where your inverter will be installed
• Connect panel cables using MC4 connectors (the weatherproof plug-and-socket connectors used throughout solar installations) — these are on the DC side, which does not fall under Part P
• Design your wiring diagram and plan the electrical installation

DNO notification

All grid-connected solar systems must be registered with your DNO (Distribution Network Operator) — the company that owns the physical cables and infrastructure in your area, separate from your energy supplier. For systems up to 3.68kW single-phase, this is the G98 process: notify within 28 days of commissioning. For larger systems, G99 requires prior DNO approval before installation begins. You can submit G98 notifications yourself via your DNO's website.

What you cannot do without qualification

Connecting to the consumer unit

The consumer unit (also called a fusebox) is where your home's electrical circuits are controlled. Connecting your solar system's AC output to the consumer unit is notifiable electrical work under Part P of the Building Regulations. This means it must either be:

• Carried out by a registered electrician who is a member of a competent person scheme (such as NICEIC or NAPIT), or
• Inspected and certified by your local authority building control after the fact

Skipping this does not send anyone to prison, but it creates a serious problem if you ever come to sell your home — solicitors will ask for an electrical installation certificate, and an unsupported solar installation can stall or kill a sale.

Signing off the electrical work

Even if you carry out the wiring perfectly, only a registered competent person (or building control) can issue the certificate that proves the work meets the regulations. You cannot self-certify this.

The MCS trade-off: what you lose without a certificate

MCS stands for Microgeneration Certification Scheme — it is the quality standard for solar installations in the UK. An MCS certificate is issued by a registered MCS installer after completing a job that meets the standard.

Without an MCS certificate, you cannot register for the Smart Export Guarantee (SEG). The SEG is the scheme that pays you for electricity you export to the grid. Current SEG rates from the best-paying suppliers run from around 5p up to 15p per unit (kWh) on fixed tariffs. For a typical 4kWp system in the UK, you might export 800–1,500 kWh per year.

At 5p per unit, that is £40–75 per year. At 15p, it is £120–225 per year. Over 25 years, you could be leaving £1,000–5,600 on the table, depending on the rate you would have qualified for and how export rates develop over time.

You also lose manufacturer warranty support in some cases — some inverter manufacturers only honour warranties on systems installed by certified professionals.

The honest cost comparison

Here is what the numbers look like for a typical 4kWp system:

DIY route (you do the mounting, hire an electrician for the connection):

• Panels (8 x 400W): £600–900
• Inverter (3.6–4kW hybrid): £800–1,200
• Mounting rails and roof hooks: £250–400
• DC cabling and MC4 connectors: £100–200
• AC wiring materials: £50–100
• Electrician for connection and certificate: £300–600
• Building control fee (if applicable): £100–200
• Approximate total: £2,200–3,600

Professional MCS-certified installation:

• Panels, inverter, all materials: included
• Labour, scaffolding, installation: included
• MCS certificate, building control notification: included
• Approximate total: £6,000–8,000 (consistent with the cost data for typical 4kWp systems)

The DIY saving is real — typically 50–60% of the all-in professional cost. But you need to factor in the lost SEG income and the value of the MCS certificate for future property sale.

The best middle ground

If you want to reduce costs without losing MCS and SEG eligibility, the most practical approach is a hybrid:

1. Buy the equipment yourself. Sourcing your own panels and inverter from a reputable wholesaler can save £500–1,500 compared to what an installer would charge for the same kit. Make sure you choose products that are on the MCS Product Eligibility List — your installer will need this.

2. Hire an MCS-registered installer for the installation itself. Some installers will work with customer-supplied equipment; others will not. Be upfront when getting quotes. You will pay for their labour, scaffolding, and the MCS certification.

3. Hire a registered electrician for the connection. If you have done the mounting work yourself, an electrician can complete the AC connection and issue the certificate. This is the route that keeps costs down while maintaining legal compliance.

This approach will not save as much as full DIY, but it is significantly cheaper than a standard full-service installation and you retain the SEG eligibility.

Who full DIY actually suits

Going fully self-installed (including the electrical connection via building control sign-off) can make sense if:

• You are a qualified electrician yourself
• You are installing on an outbuilding, shed, or structure that does not feed the main dwelling (different rules apply)
• You are putting together a small off-grid system — a cabin, boat, or caravan — that is not connected to the mains at all
• You want to learn the system in detail and are prepared for the administrative steps involved

For most homeowners installing a grid-connected system on their main home, the hybrid approach — buy your own equipment, hire professionals for what they must do — gives the best balance of savings and compliance.

Share this article