Solar Energy Concepts

DIY Solar for UK Homes. Real guides from a real install.

Step-by-step practical guides, component lessons, and hard-earned fixes from a real UK DIY solar setup.

7.15kWpinstalled 6,072kWhgenerated 2025 £1,668/yrmodelled value

Start small Plug-in solar Rules, kit, costs, and what 800W can actually do. Buy well Panel prices Current UK prices and what is changing in 2026. Level up Batteries When storage makes sense, and when it is dead money.

Latest field notes

Practical and DIY

Solar Panels on a Shed or Garage Roof UK: Wiring and Options

Check G98 headroom first: a 4-panel garage array usually fits under 3.68kW AC if it is the only inverter on site.
Hardwire unless the kit is on the register: shed solar normally needs its own breaker via a registered electrician. Since 27 August 2026 a listed plug-in kit may use a suitable socket, one per household.
Prefer AC cable runs from a local inverter to the house consumer unit over long DC strings.
With a battery, ROI can fall under 3 years on a well-used base load.
A summer house used as an office pays back faster because daytime load matches generation.

Updated 15 Oct 2026 Read Entry →

An image of a wall with solar panels from the ground up. On a nice sunny day.

Fundamentals

Wall Mounted Solar Panels UK: Vertical Mounting Guide (2026)

Vertical wall mounted solar produces about 290 kWh/year per 400W south-facing panel in the UK, roughly 30% less than an optimal roof mount.
Wall wins when the roof is full, shaded, or wrong-orientation, or when you want better winter sun on a vertical face.
DIY vs installer is a safety and compliance choice, not only a cost choice.

Updated 15 Oct 2026 Read Entry →

Practical and DIY

Retrospective Building Regulations Approval for Solar Panels (UK)

Retrospective Building Regulations approval for solar panels is a regularisation certificate: apply to local authority Building Control, do not buy one after the fact.
The notifiable part was the electrical connection: “no building regs for the panels” almost always means the consumer-unit connection was never certified.
Regularisation is an inspection, not a purchase: the council can open up the work and require alterations before it issues the certificate.
Some evidence only a professional can produce now: an EICR from a registered electrician feeds the application; you cannot self-certify Part P work after the fact.
Doing nothing bites at sale: since October 2023 a section 36 notice can be served up to 10 years after the work was completed, and indemnity insurance is usually voided if you approach the council first.

Updated 15 Oct 2026 Read Entry →

Practical and DIY

Selling a House with DIY Solar Panels: The Documents You Need

You can sell a house with DIY solar panels without MCS: hand over the electrical certificate, Building Regulations evidence, the DNO letter and any export agreement instead.
The electrical sign-off is the document that matters most: an EIC plus a Part P Building Regulations or Building Control certificate for the consumer-unit connection.
If it was never certified, fix it before you list: get an electrician to certify the work, apply for a regularisation certificate, or fall back to indemnity insurance.
The TA6 form asks about solar at question 5.6: you answer “owned outright” and attach the export agreement; no MCS number exists for a self-build.
The conveyancer and lender decide, not this checklist: a complete folder turns a sale-blocking enquiry into a five-minute one.

Updated 15 Oct 2026 Read Entry →

Practical and DIY

Solar Panels on a Flat Garage Roof UK: Weight, Wind and Waterproofing Checks

Solar on a flat garage roof is usually possible, but it is a structural job first: the ballast holding the array down, not the panels, is what loads the roof.
Panels add about 15kg per square metre, ballast adds 30 to 60kg or more: the ballast is set by a site wind calculation, not a fixed rule, and is the load that grows on exposed plots.
Wind uplift is worst at the roof edges, so a small garage roof is nearly all edge; a low 10 to 15 degree tilt cuts the ballast a flat-roof array needs.
MCS MIS 3002 requires a structural engineer to assess the load on a ballasted flat-roof array: the panel-plus-ballast load can rival the roof’s entire code-minimum allowance, so do not judge it by eye.
Protect the membrane: seal every penetration to the EPDM, felt or single-ply type, and keep ballast clear of the drainage paths so water still reaches the outlets.
The checks are cheap next to the array: the ballast calculation usually comes free with the mounting kit, and a structural engineer’s assessment is typically a few hundred pounds.

Updated 15 Oct 2026 Read Entry →

Fundamentals

Is Plug-in Solar Legal in the UK? Rules, Kits & Limits (2026)

Plug-in solar is legal in Great Britain since 27 August 2026: 120 kits are listed Compliant on the ENA register, and City Plumbing, Argos, Wilko, Homebase and Very all sell them, from £336.
Only listed models count: the Amazon kits with a UK plug are unlisted or Non-compliant, and battery kits are excluded by the law itself.
Not every home is suitable: the IET and Electrical Safety First say a Type AC RCD rules a home out, and only 25% of adults know which type they have.
One device per household is now written into G98: the August 2026 amendment says connecting more than one “is not allowed”, so the per-circuit relaxation did not happen.
Realistic savings are £43 to £84 a year, not the government’s “up to £110”: 650 to 800 kWh, 25 to 40% self-consumed, £0 export. Payback 7 to 14 years on the £599 kit. Octopus kit buyers can export at 9p, worth about £35 to £55 more.
Already have roof solar? The 3.68 kW limit is cumulative per property, and G98 now says so for plug-in kits in terms.
England sets planning limits too: a kit on a wooden balcony, wall or fence, or on a listed building, gets no automatic planning permission.

Updated 15 Oct 2026 Read Entry →

Practical and DIY

Solar Panel Planning Permission in England: The 2026 Rules

Most home solar in England needs no planning permission: roof, wall and garden panels are permitted development, and the limits loosened on 27 August 2026.
House walls now allow panels that stick out 0.4 m: up from 0.2 m, except on a wall that runs alongside a road. On a south-facing wall, the extra tilt adds roughly a tenth to the output.
Garden arrays can now sit near the boundary: 1 m high in front of the house, 2 m elsewhere within 5 m of the boundary, 4 m further in, with up to 9 m² of panels.
Fence panels no longer need planning permission for most houses: a fence counts as stand-alone solar, which the old 5 m boundary rule used to rule out.
Listed buildings get no automatic permission: conservation areas, National Parks and World Heritage Sites keep extra limits and approval steps.
Flats keep the old rules: 0.2 m on every wall, one garden array, and nothing within 5 m of the boundary.

Updated 15 Oct 2026 Read Entry →

Practical and DIY

Can You Legally Install Solar Panels Yourself in the UK?

DIY solar is legal in the UK, but the connection to your consumer unit is notifiable electrical work: a registered electrician certifies it, or Building Control inspects it.
Going DIY costs you MCS, which means no SEG export payments from most suppliers (Octopus Outgoing aside) and 20% VAT on parts instead of 0%.
You can still do plenty yourself: the panels, the racking, the DC side and your own G98 or G99 notification. This is my read of the rules, not legal advice.

Updated 15 Oct 2026 Read Entry →

System Guides

Maximum Number of Solar Panels Allowed in the UK: What Actually Limits You

There is no legal maximum number of solar panels allowed in the UK: standard homes are limited by practical constraints, not panel count.
Nine 400W panels make 3.6kWp: ten make 4kWp DC and can still use a 3.68kW G98 inverter.
Allow roughly 1.9m² per panel: then leave room for roof edges, ridges, valleys and obstructions.
G98 limits inverter capacity, not panel capacity: above 3.68kW AC on single phase, obtain G99 approval first.

Updated 15 Oct 2026 Read Entry →

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