Business & landlord energy funding (MEES / capital allowances): Warm homes plan funding

Business and landlord energy funding under the Warm Homes Plan picture

Within the Warm Homes Plan funding landscape, businesses and commercial landlords occupy a distinct position, and it is worth being clear about it. The big domestic schemes, ECO4, the Great British Insulation Scheme and the Warm Homes: Local Grant, are largely focused on owner-occupiers and private tenants. The Warm Homes Plan itself is primarily domestic. That does not mean businesses are left without funding, it means the route is different. Commercial premises mostly rely on capital allowances and periodic local or devolved grants rather than a single national SME scheme, and the most powerful lever is the tax system. Solar PV, heat pumps and battery storage qualify as plant and machinery under the 100 percent Annual Investment Allowance, up to 1 million pounds a year, which can be worth up to 25 percent effective tax relief in year one for a limited company.

There is also a regulatory clock running. Minimum Energy Efficiency Standards, or MEES, are tightening for commercial property. The current minimum to let is EPC E, and a commercial EPC B target has been proposed for 2030. That means landlords and owner-occupiers face a deadline to improve poorly rated buildings, and doing the work now under capital allowances is usually cheaper than waiting for an enforcement date. The Boiler Upgrade Scheme also reaches into this space, since it covers small businesses replacing a fossil-fuel system. We map the commercial route separately from the domestic one so a landlord or business owner gets advice aimed at their actual position.

What a typical business project looks like and how we scope it

Commercial projects vary far more than domestic ones, so scoping is about matching the building and its measures to the right funding and tax treatment rather than a single specification. The measures span commercial heat pumps, solar PV, batteries and insulation, with project values typically in the 20,000 pounds to 500,000 pounds plus range depending on the building and the work. Where there is a payback to calculate, commercial solar or heat pump projects typically pay back in 4 to 8 years after tax relief, which is the genuine investment case that the domestic grant schemes do not have. We scope from the building's energy use and the regulatory position, in particular how far the current EPC sits from the MEES targets, then identify which capital allowances and any live local grants apply.

For a small business specifically, there is an extra route, since the Boiler Upgrade Scheme covers small businesses replacing a fossil-fuel system on the same fixed-grant basis as a home. So a small commercial premises swapping an old gas or oil boiler for a heat pump may be able to combine the BUS grant with capital allowances on other qualifying plant.

The honest position for most commercial owners is that there is no single national grant equivalent to the domestic schemes, and that is a genuine pain point rather than something to gloss over. Businesses and landlords face the MEES deadlines without a clear, standing funding scheme aimed squarely at them, which is exactly why the picture has to be assembled from several routes, capital allowances, the Boiler Upgrade Scheme for small premises, and whatever local or devolved decarbonisation grants happen to be open at the time. Treating that honestly is the difference between a credible plan and a misleading promise of free money. We set out what is genuinely available rather than implying a domestic-style grant exists for commercial buildings when it does not.

Costs, payback and tax relief

The commercial case is built on tax and avoided cost rather than free grants. Project values run from 20,000 pounds to 500,000 pounds plus, and the headline relief is the 100 percent Annual Investment Allowance, which lets a business write off qualifying plant, solar PV, heat pumps and batteries, against profit up to 1 million pounds a year, worth up to 25 percent effective tax relief in year one for a limited company. With that relief applied, commercial solar and heat pump projects typically pay back in 4 to 8 years. Where a business exports surplus generation, the Smart Export Guarantee provides a payment for that export on top of the avoided import. And for small businesses replacing a fossil-fuel system, the Boiler Upgrade Scheme contributes a fixed grant towards the heat pump. Our cost guide works through the post-relief economics, and you can read the rules on the gov.uk capital allowances page.

Funding routes in detail

The main commercial route is capital allowances, specifically the 100 percent Annual Investment Allowance on qualifying plant, since the domestic grant schemes largely exclude commercial property. This is often paired with MEES-driven upgrades, where the regulatory deadline is the reason for the work and the tax relief is what makes the timing efficient. The Boiler Upgrade Scheme is the second route, covering small businesses replacing a fossil-fuel system. Beyond these, local authority and devolved business decarbonisation grants run periodically, so it is worth checking what is currently open in your area, though these come and go rather than forming a single standing scheme. Because the Warm Homes Plan is primarily domestic, businesses should verify the current MEES timeline on gov.uk before quoting dates, as the proposed targets are still subject to change.

The Annual Investment Allowance is worth setting out in a little more detail, because it is the route that does the heavy lifting. It allows a business to deduct the full cost of qualifying plant and machinery from its taxable profits in the year of purchase, up to 1 million pounds a year, and solar PV, heat pumps and battery storage all qualify as plant. For a limited company that translates into up to 25 percent effective tax relief on the cost in year one, which materially shortens the payback compared with the headline price. Where a project is larger than fits neatly within one year's allowance, the relief can be structured to spread across periods, and there are other capital allowance mechanisms for spend above the annual cap. The right structure depends on the company's profit and timing, so this is a point to confirm with an accountant alongside the technical scoping, and it is one we always flag rather than present a single gross cost.

Compliance and sector considerations

For commercial work the central compliance driver is MEES, the Minimum Energy Efficiency Standards for let property. The commercial requirement is currently EPC E minimum to let, with a commercial EPC B target proposed for 2030, and because that timeline is proposed rather than fixed, you should verify the current dates on gov.uk before committing to a deadline-driven plan. Heat pumps and solar PV follow the same accreditation logic as domestic, MCS certification where the Boiler Upgrade Scheme or Smart Export Guarantee is involved, and G98 or G99 grid notification for PV and battery. Larger commercial PV may need a more involved grid connection than a domestic install. Where a building is listed or in a conservation area, external measures can need consent. The key point is that commercial funding is a mix of tax relief and regulation rather than a single grant application.

How we approach this kind of project

We treat commercial enquiries as a separate discipline from the domestic schemes, because the funding works differently. We start from your building's EPC and the MEES position, since the regulatory deadline often sets the timetable, then we model the project with the 100 percent Annual Investment Allowance applied so you see the real post-relief cost and a payback in the 4 to 8 year range rather than a misleading gross figure. We check whether the Boiler Upgrade Scheme applies to a small-business heat pump swap, flag any live local or devolved decarbonisation grants, and only work through MCS-certified and accredited installers. We are careful to verify the current MEES timeline rather than quote a proposed date as if it were fixed, so a landlord plans against the real rules.

We also sequence the commercial decision in the order that protects your money. The first question is the regulatory one, how far the current EPC sits from the MEES minimum to let and the proposed tightening, because that sets how urgent the work is and what it must achieve. The second is the technical one, which combination of solar PV, commercial heat pump, battery storage and insulation will move the building where it needs to be. The third is the tax one, how the Annual Investment Allowance and any other capital allowance mechanisms apply to your company's profit and timing, which is a point to confirm with your accountant. Only once those three line up do we put a number on the project, so what you see is a realistic post-relief cost and payback rather than a gross figure that ignores the tax position. For PV and battery, we also handle the G98 or G99 grid notification that applies to any generation or storage, which a domestic-only adviser can overlook on a larger commercial connection.

An illustrative example

As an illustrative composite based on a typical commercial route, consider a commercial landlord with a let building sitting near the current EPC E minimum and facing the proposed tightening toward EPC B by 2030. Rather than wait for an enforcement deadline, the landlord invests in solar PV and a commercial heat pump as plant and machinery. In an illustrative case the qualifying cost is written off under the 100 percent Annual Investment Allowance, delivering up to 25 percent effective tax relief in year one, with the combined avoided import and any Smart Export Guarantee payment giving a payback in the 4 to 8 year range while lifting the EPC toward the MEES target. The figures and outcome are illustrative and depend on the building, your tax position and the live MEES timeline, which should be verified on gov.uk.

A landlord or business with a MEES deadline? The route is tax-led, not grant-led. Read the grants and funding guide, model the post-relief economics on the cost page, then tell us about your building. You can also read the funding FAQs, or compare with the Boiler Upgrade Scheme for small-business heat pumps and the flagship Warm Homes Plan overview.