What should a renewable energy installation quotation include?

A useful renewable energy installation quotation should let you compare the proposed system, the work involved and the financial assumptions without having to guess what has been left out. It should be based on a proper survey of the property, not just a panel or battery price.

The design should relate to your home. A solar quotation should show the proposed panel position, orientation and roof area, along with any shading that could affect generation. It should explain where the inverter, battery and isolators will go. If the roof is divided between different orientations, the design should account for that rather than treating every panel as if it faces the same way.

Your roof may be old, irregular or partly shaded by trees and neighbouring buildings. The quotation should state how those conditions have been considered. For a listed property, barn conversion or home in a sensitive location, it should identify any planning or conservation restrictions that need checking before work starts.

Every main component should be named and described. Look for the make, model and capacity of the panels, inverter, battery and mounting system. A battery quotation should explain its usable storage capacity, not only its larger nominal capacity. It should also state whether the system can provide backup power during a grid failure. Backup is not automatic and may require additional equipment and changes to the consumer unit.

An air source heat pump quotation needs different detail. It should identify the heat pump output, the hot water cylinder, controls and any buffer or additional components. It should explain which radiators, pipework, emitters or electrical supplies need changing. Your existing radiators may work in some rooms but not others, so a room-by-room heat loss assessment matters more than a comparison with the size of the old boiler.

The work included should be itemised. The scope may include scaffolding, roof access equipment, mounting, cabling, isolators, consumer unit alterations, earthing, drilling, making good and commissioning. For a heat pump, it may include the base, condensate drainage, pipework, cylinder installation, radiator changes and removal of the old heating equipment.

Ask the installer to identify work that is excluded as well. This could include roof repairs, asbestos removal, major building work, planning applications or upgrades that only become necessary after further investigation. Clear exclusions help you understand the real cost and reduce arguments later.

The price should show what you are paying for. The quotation should separate equipment, labour and any other charges where that makes the figures easier to understand. It should state whether the price includes VAT and show the payment stages. If the final design depends on a survey finding, such as a consumer unit upgrade or roof repair, the quotation should explain how that change would be priced.

Our written quotations set out the agreed work before it starts. That gives you a record of what we have allowed for and avoids surprise charges caused by unclear scope.

Performance estimates need their assumptions beside them. Solar generation depends on roof direction, pitch, shading, panel output and local conditions. Battery savings depend on how much electricity the home uses, when it is used and how the battery is controlled. A heat pump estimate depends on the building’s heat loss, flow temperature, hot water demand and electricity tariff.

A good quotation should distinguish between estimated generation or consumption and a guaranteed result. It should show how the figures were produced and avoid presenting payback as a universal number. We work those figures around the property, its heating pattern and the equipment being considered.

Grant and export arrangements should be specific. If a heat pump may qualify for the Boiler Upgrade Scheme, the quotation should explain the eligibility checks and what the installer will do to support the application. MCS certification allows an eligible installer to make that application on your behalf. For solar and battery systems, MCS certification also supports eligibility for the Smart Export Guarantee, subject to the relevant supplier and scheme requirements.

Because grant rules, export tariffs and eligibility conditions can change, the quotation should state which assumptions apply at the time it is issued. It should not treat a grant or export payment as certain until the required checks have been completed.

Warranties should be separated by responsibility. The document should show the manufacturer warranty for each major component and explain what covers the installation itself. Check who you contact if a fault occurs, whether registration is required and whether servicing or monitoring is part of the arrangement.

For a home with an oil or LPG boiler, an older electrical installation or unusual pipework, the quotation should also explain how the existing system will be isolated, altered or retained. OFTEC registration matters when work involves an oil-fired system. Electrical work should be completed by an appropriately registered electrician, with the required certificates included in the handover paperwork.

The practical arrangements should be written down. You should know the expected sequence of work, what access the engineers need and which rooms may be affected. The quotation should cover scaffolding, cable routes, noise, drilling, temporary loss of power or water and removal of redundant equipment where relevant.

Your home may need a consumer unit alteration before a battery or heat pump can be connected. A quotation that identifies this early is more useful than one that shows only the generation equipment. It should also explain how the property will be left, including making good and removal of packaging or old equipment.

Handover paperwork is part of the installation. The completed job should leave you with commissioning information, operating instructions, certificates and details needed for monitoring, warranties, export registration or grant administration. You should understand how to use the controls and where to find the isolators without relying on a sales brochure.

Before comparing quotations, check that each installer has allowed for the same work and has used similar assumptions. The lowest figure may simply exclude the electrical alterations, access equipment, radiator changes or paperwork that another quotation has included. A clear document gives you a fairer comparison and shows where a follow-up question is needed.