Solar panel costs in Grays: how to compare quotes

A useful budget begins with the size and scope of the proposed system. Energy Saving Trust currently gives around £7,600 for a typical 4.5 kWp domestic solar installation. This is a national reference checked on 7 September 2026, not a Grays Solar offer or a measured average for Grays. Battery storage, roof work and unusual access can change the total.

We recommend using an initial budget to decide which options to investigate, then comparing written quotations based on your actual property. A low headline price means little if the proposed system omits scaffolding, electrical work or equipment you need.

Ask each installer to quote against the same requirements. Record the total panel capacity in kWp, the inverter model and whether battery storage is included. The number of panels alone is not a reliable comparison because panel ratings and dimensions vary.

Request two versions of the proposal: solar on its own and the same system with storage. The difference shows what you are paying for the battery and related work. Then compare the additional expected benefit, allowing for energy losses and export income you would otherwise receive.

Avoid adding the full value of daytime solar savings to the full value of battery discharge if both calculations count the same electricity. Ask the installer to show the energy flow through the model.

HMRC lists a temporary zero rate for qualifying installations of solar panels and battery storage in residential accommodation until 31 March 2027. Eligibility and the treatment of associated work need to be checked for the actual supply. Ask the installer to show the VAT treatment on the quotation; do not apply the domestic rule to every commercial project or EV charger.

Separate electricity used at home from electricity exported. Check the import rate, export rate, predicted generation and household usage assumed in each proposal. Ask what happens if energy prices fall, a battery needs replacing or your daytime routine changes.

Our calculator illustrates a scenario using displayed assumptions. It does not inspect your roof or provide a binding price. An installer quotation should explain its own method and exclusions.

Share your postcode, property type, approximate annual electricity use and whether you want storage or EV charging. Note roof repairs or extensions you are planning. Grays Solar connects enquiries with partner installers who can get your next appointment booked within 24 hours; survey and installation dates are agreed separately.