Is Solar Worth It for Commercial Property?

Is solar worth it for commercial property? The honest answer

Ask whether solar panels are worth it for commercial property and you will get a different answer depending on who is paying and what they own. The blunt version is this: for most UK commercial buildings, yes, but the case is rarely just about the electricity bill. For an owner-occupier the return is a clean five-to-eight-year payback. For a landlord the return often shows up somewhere else entirely, in the EPC band, in continued lettability under tightening regulation, and in the capital value of the asset. This guide separates those threads so you can judge the case for your own building rather than a generic one.

The reason the economics work at all comes down to timing. A commercial building draws most of its power, IT, air conditioning, ventilation and lighting, between roughly 06:00 and 18:00, which is almost exactly when a roof generates. That overlap means most of what the system produces is used on site, where it is worth four to five times more than power exported to the grid. Solar is not a clever financial product bolted onto a building, it is a good match between when a commercial property uses energy and when the sun is up.

The bill case: payback for the occupier

If you occupy the building and pay the electricity, the worth-it question is a straightforward cash calculation. Simple payback for most UK commercial buildings sits at 5 to 8 years, after which the power is effectively free for the decades the array keeps running. Where you land in that range depends on your load shape. A daytime-heavy, high-baseload site, a manufacturer, a busy showroom, a leisure venue, uses most of its generation on site and sits at the faster end. An office that empties at weekends self-consumes less and exports more, pushing payback toward the longer end, often 7 to 9 years.

Two levers move that number. The first is tax: solar sits in the plant-and-machinery category, which means a profitable company can claim the whole cost against year-one profit through the 100% Annual Investment Allowance, an illustrative saving of around a quarter of the project value for a limited company at current corporation tax rates. The second is export: whatever the building does not use earns 4 to 15p per kWh under the Smart Export Guarantee as of 2026, which matters most for the weekend-empty buildings whose paybacks are otherwise longest. Put both into the model and the worth-it case for an occupier is rarely close. The cost guide sets out the numbers by building size, and the savings calculator gives a quick first-pass against your own spend.

The asset case: why landlords should care even without the bill saving

Here is where commercial property departs from a simple bill calculation. If you let the building and the tenant pays the electricity, the bill saving flows to the tenant, not to you, unless the lease shares it. At first glance that looks like a reason for a landlord to pass. It is not, because the landlord’s return shows up in the asset.

EPC and MEES: the regulatory floor

The Minimum Energy Efficiency Standards already prohibit the letting of the worst-rated non-domestic property, and the threshold is set to rise to band C by 2027 and band B by 2030. A building that cannot meet the standard cannot lawfully be let, and a building that cannot be let has lost a large part of its value overnight. Solar is one of the few single measures that can lift a building several points, commonly moving a band D to a C or a C to a B, which is exactly why it belongs in a MEES and green-lease conversation rather than purely an energy one. For a landlord, the worth-it question is partly defensive: an array can be the difference between an asset that keeps earning rent and one that sits empty. The official position is set out in the government’s MEES guidance.

Asset value and lettability

Beyond bare compliance, commercial premises with PV installed commonly show an illustrative 5 to 15% uplift in value, and they let more easily. Corporate tenants increasingly screen buildings on sustainability, institutional buyers ask ESG questions in diligence, and a visible commitment to on-site renewables is a differentiator in a soft letting market. For a landlord, solar is less an energy decision than an asset-management one: it protects the income stream, supports the valuation, and makes the building easier to let and easier to sell. That is the worth-it case even when the bill saving sits with someone else.

Capturing the value on a let building

The split between who pays the bill and who funds the panels is the one genuine complication, and it is solvable. On a single-let building a green-lease addendum can set out how the cost and the saving are shared, often pairing a modest service-charge contribution from the tenant with their lower energy bill. On a multi-let or mixed-use building, where multiple tenants each hold their own supply, an allocation model such as a sleeve PPA or virtual net metering does the job, with recovery through the service charge under the RICS Code on Service Charges 2018. A landlord who structures the lease well captures a share of the energy saving on top of the EPC, MEES and asset-value benefits, which tips the case firmly into worth-it territory. Our mixed-use commercial page goes deeper on how this works across multiple tenants.

When solar is not worth it (yet)

An honest guide has to name the cases where the answer is no, or not yet.

• Genuinely unsuitable roofs. A heavily shaded roof, a fragile or lightweight structure that cannot take the load, or a building from before 2000 whose asbestos status has not been resolved may make a project uneconomic or impractical until the underlying issue is fixed. A proper roof and structural assessment, not an optimistic estimate, is the only way to know.
• Imminent sale or short lease with no transfer plan. If you expect to sell or vacate within a year or two and have not thought through how the system transfers, the case weakens, though even here a system sold with the building or relocated can preserve value rather than strand it.
• Single-phase supply constraints. Many small premises have a single-phase supply that limits practical PV, and a three-phase upgrade may be needed for a larger system. That cost belongs in the feasibility study, not discovered after the fact.

None of these are reasons solar fails in general. They are reasons a specific building needs a real assessment before anyone claims a payback, which is the difference between a credible proposal and a clipboard sales pitch.

So, is it worth it for your building?

For an owner-occupier paying today’s commercial electricity prices, solar panels for commercial property are almost always worth it, a 5 to 8 year payback followed by decades of cheaper power, sharpened by the Annual Investment Allowance and topped up by export income. For a landlord, the worth-it case is different but no weaker: the EPC uplift, MEES compliance ahead of the 2027 and 2030 deadlines, and the protection of lettability and asset value make the array pay even when the bill saving sits with the tenant, and a well-drafted lease lets the owner share that saving too.

The one thing that is never worth it is a generic estimate. Every credible answer should come from your own half-hourly meter data, a real roof assessment and your actual lease and tax position. To pressure-test the case for your building, run the savings calculator, read the grants and funding routes that remove the capex barrier, and then request a free feasibility and we will model the numbers from your own meter data and roof drawings.