Can I Install Solar Panels Myself in the UK? The 2026 Definitive Guide

Short answer: yes, it is legal to install solar panels yourself in the UK. No law says an MCS-certified installer has to put the panels on your roof. But you cannot just throw some panels up there and call it done - the electrical connection, the DNO notification, and the Building Regulations sign-off all have rules. Here is exactly what you can do yourself, what needs a professional, and how much it saves you.

The bottom line on DIY solar in the UK

Here is the truth: installing solar panels yourself is perfectly legal, thousands of people in the UK do it every year, and it saves serious money. A 4kW system that costs £6,000-£8,000 from a professional will set you back roughly £4,000-£5,500 in parts if you fit it yourself. That is a 20-30% saving before you start. The caveats are clear but manageable:

• You need electrician sign-off on the final AC connection (Part P)
• You must notify your DNO (G98 or G99) before or just after connecting
• Without MCS certification, you cannot claim SEG export payments
• Your home insurance may be affected if the work is not certified
• You take on the safety and roof-access risk yourself

For most competent DIYers with some electrical knowledge and a head for heights, the balance comes down in favour of doing it yourself. This guide walks through every requirement so you know exactly what you are signing up for.

Is DIY solar actually legal?

Yes, and this is the single most important thing to understand. There is no UK law that requires an MCS-certified company to install solar panels on your roof. The Microgeneration Certification Scheme (MCS) is a voluntary quality standard, not a legal requirement. You can legally:

• Mount panels on your roof or in your garden
• Run DC cables from the panels to an inverter
• Mount and wire the inverter (DC side)
• Run AC cabling to the consumer unit (as long as it is signed off)

What you cannot do without a qualified electrician:

• Make the final connection to your consumer unit (this is notifiable work under Part P)
• Commission the system and verify it is safe

Think of it like plumbing: you can fit the pipes and the shower head yourself, but the final connection to the mains needs a qualified professional to sign it off. Same principle, lower stakes (unless you drop a panel through your roof, which is a real risk we will get to).

What does DIY actually involve?

If you are the kind of person who has swapped a consumer unit, wired a shed, or fitted a new bathroom from scratch, a DIY solar install is well within reach. Here is the broad sequence:

1. Design and survey - measure your roof, check orientation and pitch, work out how many panels fit. Use our solar calculator for the generation estimate.
2. Order the kit - panels, inverter, mounting rails, clamps, DC cables, MC4 connectors, AC isolator, generation meter. See our best solar kits guide for what to buy.
3. Scaffold or MEWP - you need safe roof access. Budget £500-£1,000 for scaffolding hire.
4. Mount the rails - attach roof hooks to rafters (lift a tile, bolt the hook, replace the tile). Run horizontal aluminium rails across.
5. Fit the panels - clamp panels to the rails. Wire them in series or parallel with MC4 connectors. Wear a harness and tie it off.
6. Run DC cables - through the roof space to where the inverter lives (garage, loft, utility room). Use solar-rated twin-core cable.
7. Mount and wire the inverter - DC in from the panels, AC out to the consumer unit. String inverters go near the consumer unit.
8. Electrician connection - your Part P electrician runs the final AC cable from the inverter to a dedicated MCB in your consumer unit, installs the AC isolator, and certifies the work.
9. DNO notification - submit G98 (if under 3.68kW) or G99 (if over) to your Distribution Network Operator. Your electrician usually handles this.
10. Switch on - flip the isolator and start generating.

The full step-by-step is in our solar installation guide with wiring diagrams and safety procedures.

DIY vs professional: the real cost comparison

Here is the honest numbers for a typical 4kW system. Your actual cost depends on panel choice, inverter type, roof complexity, and whether you already own tools:

The DIY saving is real: roughly £2,000 to £3,000 on a standard 4kW system. That is the cost of the labour and installer margin you are cutting out. For a larger 6kW system, the saving is bigger (£2,500-£4,000). The main trade-off, as discussed below, is SEG eligibility.

The MCS and SEG issue (the one you need to care about)

MCS certification is the gatekeeper to the Smart Export Guarantee. SEG pays you 3-16p per kWh for electricity you export to the grid. A 4kW system exporting roughly half its generation earns about £100-£240 per year in SEG payments. Without MCS, you cannot claim this.

But here is the nuance. If you self-consume most of your generation (shift your washing machine, dishwasher, and EV charging to when the sun is shining), the value of the electricity you avoid buying (26.11p/kWh under the July 2026 price cap) far exceeds what you would earn from SEG. A household running at 60% self-consumption saves around £650-£850 a year on import bills alone. The SEG income on the remaining 40% export is maybe £80-£150 extra.

So the "no SEG" objection matters less the more daytime electricity you use. If you are out of the house 9-5, it matters more. There is also a middle path: hire an MCS-registered electrician to design and certify the system (roughly £500-£1,000 extra), which unlocks SEG while you still do most of the installation labour yourself.

G98 and G99: the DNO forms you need to know about

Connecting a solar system to the grid is not optional paperwork. Your Distribution Network Operator (DNO) needs to know you are feeding power back. Here is what applies:

• G98 (formerly G83/2): For systems under 3.68kW per phase. You install first, then notify. It is a notification, not an application - your DNO cannot refuse it. Most DIY solar systems (3kW-3.6kW) fall under G98.
• G99: For 3.68kW and above. You need pre-approval before connecting, which takes 4-6 weeks. Most 4kW and larger systems need G99.

Most electricians will handle the DNO notification as part of their sign-off. But the legal responsibility sits with you as the homeowner, so make sure it gets done. The plug-in solar systems (SI 2026/848, effective 27 August 2026) also fall under G98 - see our plug-in solar guide for the details.

What about plug-in solar? (minimum-effort DIY)

If the idea of getting on a roof does not appeal, plug-in solar (sometimes called balcony solar) is the zero-installation option. From 27 August 2026, new regulations (SI 2026/848) make it explicitly legal to plug a solar panel into a standard wall socket in the UK. These systems are limited to 600W-800W and cost £400-£1,000. They are:

• No roof work - panels sit on the ground, on a balcony, or hang from a wall bracket
• Plug into a standard socket via a microinverter
• G98 notification only (simple, cannot be refused)
• Post-2019 homes with RCBOs handle the reverse current safely
• Save roughly £70-£132/year depending on location and self-consumption

Full details in our plug-in solar UK 2026 guide. For renters or anyone who does not want roof penetrations, this is the easiest entry point to solar.

Safety: the part nobody talks about enough

Solar panels are heavy, awkward, and 10 feet off the ground. The biggest risk in a DIY install is not the electrics - it is falling off a roof. Here are the non-negotiables:

• Use a safety harness anchored to a rated roof anchor point. Do not trust gutters or ridge tiles.
• Hire proper scaffolding or a MEWP. Ladders are not safe for carrying panels.
• Wait for still, dry weather. A wet roof tile is lethal.
• DC voltage kills. A single panel in full sun outputs 30-50V DC, and a string of panels can hit 400V DC. MC4 connectors are rated for disconnect under load but do not test this at home.
• Isolate the AC side before the inverter makes it live.

If you are uncomfortable at height, or the roof pitch is steeper than 35 degrees, pay a roofer to fit the mounting system and panels. You can still do the rest yourself. The extra £500-£1,000 for a roofer is cheaper than a hospital visit.

What about scaffolding and roof access?

Professional installers include scaffolding in their price. For DIY, you need to arrange it yourself. Scaffolding hire for a typical semi-detached house runs £500-£1,000, and you will have it for 1-2 weeks. Alternative options:

• MEWP hire: £200-£400 for a weekend. Faster to set up but needs driveway space and a firm, level base.
• Roof ladders + crawling boards: Cheaper but significantly more dangerous. Only suitable for low-pitch roofs (under 25 degrees).
• Ground mount: If you have garden space, ground-mounted panels on a simple frame avoid roof access entirely. Slightly lower generation in winter but safer.

DIY solar checklist: are you ready?

Before you order panels, run through this:

Frequently asked questions