What Is a Green Lease? A Plain-English Guide for Commercial Landlords

“Green lease” gets used loosely, so it helps to start with what it is not. It is not a separate legal tenure, a government scheme or a certificate. A green lease is a normal commercial lease, usually full repairing and insuring, with additional clauses that commit landlord and tenant to run the building in a more sustainable way.

For an owner, the point is practical. A standard lease often leaves landlord and tenant pulling in opposite directions on energy: the landlord owns the building, the tenant pays the bills, and neither has the full incentive to invest. A green lease is the instrument that lets you contract around that.

What a green lease usually covers

• Data sharing. The tenant agrees to share energy and water consumption data so the landlord can report on the building and plan improvements.
• Alterations. The tenant agrees not to make changes that worsen the building’s EPC rating.
• Cooperation on efficiency works. Access and cooperation when the landlord carries out improvements.
• On-site renewables. The landlord’s right to install generation such as solar, and the tenant’s obligation to cooperate.
• Cost and benefit sharing. How any contribution to the cost is set and how the saving is shared.

The Better Buildings Partnership publishes the model most solicitors use. The detail of its clause tiers and renewable-energy hierarchy is in BBP Green Lease Toolkit: the solar clauses an owner needs.

When to introduce one

There are three natural moments.

1. A new letting. The easiest time, because both sides are negotiating anyway. Setting a medium-green default for new lettings stops the question being reopened tenant by tenant.
2. A renewal or rent review. A reasonable point to add the clauses, particularly if the tenant wants something in return.
3. A specific project. If you want to put solar on the roof of a let building, a short addendum or side letter covering the right to install, the cost mechanism and the tenant-savings cap can do the job without rewriting the whole lease.

Why it matters for solar

Without the right clauses, a tenant who holds the roof as part of its demise can refuse access, and a landlord who funds solar may find the savings go entirely to the tenant. A green lease fixes both. It reserves the right to install, and it sets out how the capital is recovered, whether through a PPA unit price, a capped annual contribution or rent.

The market principle is that a tenant’s contribution should be reasonable only up to its own measured savings. A tenant should never be worse off than buying grid power. We cover the full cost-sharing logic in our guide to green leases and solar, and the case for why the capital cost cannot go on the service charge in can a landlord recover solar costs through the service charge.

Does it matter for compliance?

Increasingly, yes. Letting commercial property below EPC E has been unlawful in England and Wales since 1 April 2023, and the Government’s interim response of 18 June 2026 proposes EPC B by 2031 for privately rented non-domestic buildings over 1,000 square metres, subject to secondary legislation. A lease that stops the tenant making EPC-damaging changes, and permits the landlord to carry out improvements, protects the asset.

Frequently asked questions

Is a green lease legally different from a normal lease?

No. It is a normal lease with extra clauses. It is only as binding as the wording that has been agreed.

Can I add green-lease clauses to an existing lease?

Yes, by variation or side agreement, usually at renewal, rent review or when you propose a specific project. The tenant-savings cap is the incentive that makes cooperation rational.

Does a green lease force the tenant to pay for solar?

Not by itself. It can support a contribution, capped at the tenant’s savings, if the lease or addendum says so.

Where do I start?

With the lease you already have. Send an enquiry with the building and tenancy structure and we reply by email.