Is plug-in solar cheaper than rooftop solar?

Generally yes. A small plug-in system is a fraction of the upfront cost of a full rooftop array, because there is no scaffolding, roof work or large inverter. But it also generates far less, so the right comparison is value rather than headline price. Use our calculator and cost pages for indicative figures.

Which generates more electricity?

Rooftop, by a wide margin. A rooftop array is typically several kilowatts and can cover a large share of a home's annual use. A plug-in system is usually around 800W and is designed to offset daytime background loads rather than power a whole house.

In principle the approaches are not mutually exclusive, but they overlap in purpose, and the UK rules for plug-in solar are not yet settled. Most people choose one based on their property, budget and whether they own or rent. Rooftop suits owner-occupiers with a suitable roof; plug-in suits flats, balconies, gardens and rented homes.

Is plug-in solar legal in the UK yet?

Not currently. Under the existing framework it cannot be sold, supplied or used in the UK, and a Government consultation is open until 30 June 2026. Rooftop solar, by contrast, is a well-established, regulated route. See our legal status page for the detail.

Guide

Plug-in solar versus rooftop solar

Two very different approaches to home solar. We compare cost, output, installation effort, planning, flexibility and who each one suits, so you can see which fits your property and budget.

Written and edited by Christopher Panteli

Last reviewed 19 June 2026

Christopher is the founder and editor of MyPlugInSolar. He oversees the site’s research standards, data tools and editorial process. He is not an electrician or solar installer, and specialist technical claims are sourced from official documentation or reviewed by appropriately qualified professionals.

Plug-in solar and rooftop solar solve similar problems in very different ways. A plug-in system is a small, movable kit you connect through a socket; a rooftop installation is a larger, permanent array wired into your home by accredited installers. Neither is simply better — they suit different properties, budgets and ambitions.

One important difference up front: rooftop solar is a well-established, regulated route in the UK, whereas plug-in solar cannot currently be legally sold, supplied or used here. A Government consultation that could change this is open until 30 June 2026. The full position is on the UK legal status page.

How they compare

The table below sets the two approaches side by side. The figures are indicative only — actual costs and output depend on your property, location and choices. For numbers tied to your address, use our output calculator and cost guide.

Indicative comparison — your own figures will vary by property and location.
	Plug-in solar	Rooftop solar
Cost	Low upfront cost; a fraction of a full installation.	Several times higher; a substantial upfront investment.
Typical output	Small — a well-placed 800W system might give roughly 600–900 kWh a year.	Much larger — arrays are several kW and can cover a big share of annual use.
Installation	Designed to be simple; no scaffolding or major roof work.	Professional installation with scaffolding and roof fixings.
Planning / notification	Rules not yet settled in the UK; consultation open.	Often permitted development, with established DNO notification.
Flexibility	Movable — you can take it with you if you move.	Permanent — it stays with the property.
Best for	Flats, balconies, gardens and rented homes.	Owner-occupiers with a suitable, unshaded roof.

Cost and value

Plug-in solar is far cheaper upfront because there is no scaffolding, roof work or large inverter. A rooftop array is a much bigger investment, but it also generates many times more electricity, so the fair comparison is value rather than headline price. A small system that quietly offsets daytime background use can still represent good value for the right home, while a rooftop array makes more sense where there is high daytime demand and a suitable roof.

Output and scale

This is the starkest difference. A rooftop installation is typically several kilowatts and can cover a large share of a home's annual electricity use. A plug-in system is usually around 800W and is designed to offset background loads — the fridge, router and standby devices — rather than power a whole house. If your aim is to cut a large bill substantially, rooftop is the route; if it is to make a modest, low-cost dent in daytime use, plug-in can suit.

Installation, planning and flexibility

Rooftop solar means professional installers, scaffolding, roof fixings and established network notification — more effort, but a known, regulated process. Plug-in solar is designed to be simple to set up, with no roof work, and its UK rules are still being decided. Flexibility is the other contrast: a plug-in system is movable and can come with you if you move, whereas a rooftop array is permanent and stays with the property.

Plug-in solar: pros and cons

Pros

Low cost compared with a full rooftop installation
Movable — you can take it with you if you move
No scaffolding or major roof work
Suits flats, balconies, gardens and rented homes

Cons

Not currently legal to sell, supply or use in the UK
Far smaller output than a rooftop array
Savings depend heavily on daytime usage
Export may earn nothing for self-installed systems

Who each suits

Rooftop solar suits owner-occupiers with a suitable, reasonably unshaded roof who want to cover a large share of their use and are ready for a bigger upfront investment. Plug-in solar suits people for whom a full installation is impractical — flats, balconies, gardens and rented homes — who want a low-cost, movable way to offset daytime background use. To weigh it up for your own situation, see whether plug-in solar is worth it.

Not yet legal — consultation open

The DESNZ consultation opened on 16 June 2026 and closes on 30 June 2026. Plug-in solar cannot be used legally in the UK today. See the the legal status for the current position and sources.

Frequently asked questions

Is plug-in solar cheaper than rooftop solar?: Generally yes. A small plug-in system is a fraction of the upfront cost of a full rooftop array, because there is no scaffolding, roof work or large inverter. But it also generates far less, so the right comparison is value rather than headline price. Use our calculator and cost pages for indicative figures.
Which generates more electricity?: Rooftop, by a wide margin. A rooftop array is typically several kilowatts and can cover a large share of a home's annual use. A plug-in system is usually around 800W and is designed to offset daytime background loads rather than power a whole house.
Can I have both?: In principle the approaches are not mutually exclusive, but they overlap in purpose, and the UK rules for plug-in solar are not yet settled. Most people choose one based on their property, budget and whether they own or rent. Rooftop suits owner-occupiers with a suitable roof; plug-in suits flats, balconies, gardens and rented homes.
Is plug-in solar legal in the UK yet?: Not currently. Under the existing framework it cannot be sold, supplied or used in the UK, and a Government consultation is open until 30 June 2026. Rooftop solar, by contrast, is a well-established, regulated route. See our legal status page for the detail.

Sources

1. PVGIS photovoltaic geographical information system — European Commission Joint Research Centre
2. Microgeneration Certification Scheme — MCS
3. BS 7671 Wiring Regulations — Institution of Engineering and Technology

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