Only 4.8% of UK homes have solar panels, according to the latest DESNZ data. That leaves 95% of rooftops generating nothing but heat loss. This week, Parliament debated why, and what to do about it.
The debate, reported by UK Parliament, focused on the gap between public appetite for rooftop solar and the practical hurdles. MPs heard that planning restrictions, grid connection delays, and upfront costs still stop most households from installing. The irony: solar is now cheaper per kWh than grid electricity, yet fewer than one in twenty homes have it.
Who qualifies, and who doesn’t
The current system is a postcode lottery. A semi-detached house in Milton Keynes can install a 4 kW system for about £5,500 after the 0% VAT cut, and earn around £120 a year via the Smart Export Guarantee. But a listed building in Bath faces planning committee costs that can eat the savings for a decade. A flat in a high-rise block has no roof access at all. The parliamentary debate raised the question of whether permitted development rights should be extended to more properties, including flats and conservation areas. No decision yet, but the fact it’s being discussed suggests the government knows the current rules are blocking uptake.
What it costs a typical 3-bed semi
For a standard 3-bed semi with a south-facing roof, solar panels typically generate 3,500-4,000 kWh a year. With a household using 2,700 kWh of that directly, the rest exported at 15p/kWh, the annual saving is roughly £400-£500. Payback on a £5,500 installation comes in 11-14 years. Add a battery (another £2,000-£4,000) and you can use 80% of what you generate, cutting payback to 8-10 years. These figures assume current energy prices and the 0% VAT rate, which runs until March 2027.
But, and here’s the catch, Ofgem’s network charges are rising. The standing charge alone will hit 60p a day in some regions from October. That eats into the savings from self-generation. The more you can shift your consumption to sunny hours, the more the maths works in your favour.
What this means for your EPC
Solar panels can lift an EPC rating by one or two bands. A typical D-rated home installing a 4 kW system plus loft insulation and LED lighting can hit a C. That matters because from 2030, private landlords must have a C rating to let properties. For homeowners, a higher EPC means lower mortgage rates from some lenders and a higher sale price, estate agents report a 2-5% premium for C-rated homes over D-rated ones. The parliamentary debate acknowledged this link but stopped short of proposing mandatory solar on new builds, which campaign groups had wanted.
The smart move for homeowners now is to get quotes before the next price cap rise in October. Installers are booked 8-12 weeks ahead in many regions. The VAT cut is guaranteed until 2027; the export tariff is not. If you have a south- or east-facing roof and no shading, the case for solar has never been stronger, and Parliament is finally listening.
Frequently Asked Questions
A standard 4 kW system for a 3-bed semi typically costs £5,000-£6,000 after the 0% VAT cut. Adding a battery storage unit adds £2,000-£4,000. Prices vary by installer and roof complexity.
Yes, typically by 2-5% for a C-rated home versus D-rated, according to estate agent data. The higher EPC rating also unlocks cheaper mortgage rates from some lenders.
