What information do you need to calculate our commercial solar panel cost?

The most useful information is not just the roof area. We need to understand how the building uses electricity, what the business wants the system to achieve and what constraints may affect the design. That lets us size the installation sensibly rather than price a system that produces more electricity than the site can use.

Half-hourly electricity data

A recent annual bill shows total consumption, but half-hourly data shows when the business uses electricity. This matters because solar generation is highest during the day, while many commercial premises have different demand patterns.

A warehouse may use most of its electricity during working hours. A pub, office or agricultural building may have different peaks. We compare the demand profile with the expected generation so the quotation reflects the electricity the business can use directly, as well as any planned export.

If half-hourly data is unavailable, we can start with bills and a clear description of the building’s operating pattern. Details such as refrigeration, machinery, pumps, computers, heating, ventilation and vehicle charging help us identify regular daytime loads.

How the premises are used

The cost can change if the business expects its electricity demand to increase. Tell us about planned machinery, refrigeration, extensions, additional offices, heat pumps or electric vehicles. A system designed around today’s consumption may not be the right choice if major loads are being added soon.

We also need to know if the building is occupied throughout the week, used seasonally or divided between several tenants. Shared supplies and tenant billing can affect how the system is designed and how its benefits are allocated.

The electrical supply and connection arrangement

Commercial premises can have different supply arrangements, including single-phase and three-phase electricity. We need the available supply capacity, the meter arrangement and any information from the distribution network operator.

If the proposed solar installation could exceed the site’s permitted export or connection capacity, the network operator may require further assessment or connection work. We include the known requirements in the quotation and identify anything that still depends on approval.

Where several buildings or separate meters are involved, send details of which roof and supply serve which part of the business. This prevents us from pricing panels on one building against electricity consumption recorded on another.

The preferred financial outcome

Some businesses want to maximise on-site use. Others are more interested in exporting surplus generation, reducing peak demand or allowing for battery storage later. Tell us which outcome matters most, along with any target return period or available budget.

We can then compare the likely system size and equipment choices against the way the premises operates. We don’t use a headline saving figure because the result depends on consumption, tariffs, generation, export arrangements and future use of the building.

If a grant, loan, lease arrangement or other funding is being considered, include the scheme name and any conditions you have been given. Funding rules and tax treatment can change, so we separate confirmed costs from items that need checking before the quotation is finalised.

Information about ownership and permissions

If the business rents the premises, we need to know who owns the building and who can approve work to the roof and electrical installation. A landlord, managing agent, freeholder or lender may need to review the proposal.

Tell us about any lease restrictions, roof warranties, insurance requirements or planned refurbishment. If the building is listed or sits within a protected area, planning requirements may affect the design, programme or cost. We can allow for the relevant process once we know which permissions apply.

Operational requirements during installation

Commercial work often has to fit around deliveries, customers, staff and production. We need to know about restricted access, loading areas, security procedures, induction requirements and any parts of the site that cannot be isolated.

Details of roof access, lifting restrictions and the building’s working arrangements help us plan labour and equipment accurately. If work must happen in defined stages, say so before we prepare the quotation. This is particularly important where isolating the supply would interrupt trading or production.

Existing equipment and future expansion

Send details of any existing solar panels, battery, generator, power management equipment or monitoring system. We need to know how it connects to the supply before deciding whether it can remain, be integrated or needs alteration.

Future expansion also affects the inverter, cable routes and distribution equipment. We won’t include capacity that has no practical purpose, but we can identify sensible provisions if the business expects to grow.

What our quotation will show

Once we have this information, we turn it into a design and written quotation. The cost should be clear about the panels, inverter, mounting system, electrical work, access equipment, monitoring, commissioning and any connection or approval items that apply.

Where an item cannot be confirmed until a specialist assessment or network response is available, we state that clearly rather than hide it in a broad allowance. Our quotation is prepared before work starts, so the business can compare the price with the expected use of the system and make an informed decision.

Solar installations are designed and installed by our MCS-certified team. That matters if the project is intended to qualify for the Smart Export Guarantee, because the installation must meet the scheme’s requirements before an export application can be made.