September 2026 , Written for landlords and managing agents in the UK, with notes where US practice differs. Sample wording is illustrative and should be reviewed by the parties' solicitors before use.
Green lease clauses are the provisions in a commercial lease that make the landlord and the tenant cooperate on how the building uses energy, water and materials: who shares which data with whom, what the tenant may and may not do to the building's systems, what standard any works must meet, who pays for efficiency improvements, and how the two sides meet to review it all. Ten years ago they were a badge for a handful of institutional landlords. Now they are the mechanism by which a landlord gets the whole-building energy data that Local Law 97, BERDO, GRESB and every investor questionnaire ask for, and by which a UK landlord gets access to a let building to do the works the 2031 EPC B standard will require.
This guide is a clause library. It sets out what a green lease is, the five clause families with a table of what each obliges, sample clauses with annotations on what each word is doing, the difference between light-green and dark-green drafting, how cost recovery for efficiency works is drafted so it survives a service charge dispute, and how the obligations are tracked once the lease is signed, which is where most of them are forgotten.
At a glance
| Question | Answer |
|---|---|
| What is a green lease? | A standard commercial lease with added provisions that oblige landlord and tenant to cooperate on the building's environmental performance |
| What are the main clause families? | Data sharing, alterations, works standards, cost recovery, and cooperation (forum and review) |
| What is the difference between light-green and dark-green? | Light-green clauses oblige the parties to cooperate and share information; dark-green clauses set measurable targets with consequences for missing them |
| Do green lease clauses change the rent? | Not directly. They can change what is recoverable through the service charge and who bears the cost of improvements |
| Where do the model clauses come from? | In the UK, the Better Buildings Partnership Green Lease Toolkit (updated January 2024); in the US, the Green Lease Leaders programme run by the Institute for Market Transformation and the US Department of Energy |
| Are they enforceable? | Yes, as lease covenants, to the extent they are drafted as obligations rather than aspirations |
What a green lease is
A green lease is not a separate document. It is an ordinary lease (or a memorandum of understanding attached to one) that contains sustainability lease clause provisions covering the building's environmental performance. The clauses sit alongside the repair, alterations, service charge and yielding-up provisions and, where they conflict, the drafting has to say which prevails.
The reason the clauses exist is that a standard lease allocates the building in a way that blocks efficiency. The tenant controls the demised premises and its plant, and the landlord cannot enter to replace it. The landlord controls the common parts and central plant, and the tenant has no obligation to tell the landlord what its own meters say. The service charge recovers repair and maintenance, but not improvement, so the landlord who replaces a working boiler with a heat pump pays for it alone while the tenant takes the saving. Nobody is obliged to meet and look at the numbers. Green lease clauses fix each of those gaps in turn.
In the UK the reference point is the Better Buildings Partnership Green Lease Toolkit, first published in 2008 and reissued on 29 January 2024 with model clauses, heads-of-terms wording and guidance for parties at different stages. The green lease toolkit is drafted as a menu rather than a template: a landlord picks the clauses that match what it can operationally deliver. In the US, the Green Lease Leaders programme sets out recognition criteria for landlords and tenants, and the leasing language tends to be shorter and to sit in the operating expense and alterations articles rather than in a separate schedule.
The clause families
Green lease provisions group into five families. The table sets out what each obliges, who the obligation falls on, and the failure it exists to prevent.
| Family | What it obliges | On whom | The failure it prevents |
|---|---|---|---|
| Data sharing | Each party to give the other its consumption data (energy, water, waste) for the premises or the building, at a set frequency, in a set format, with consent for use in reporting | Both, mostly the tenant | Landlord cannot report whole-building emissions or respond to LL97, BERDO, GRESB or a lender's ESG questionnaire because tenant-metered supplies are invisible to it |
| Alterations | Tenant not to make alterations that adversely affect the building's energy performance or EPC rating; landlord's consent conditions to include an energy assessment | Tenant | A fit-out that adds supplementary cooling, replaces efficient lighting or bypasses the BMS, dropping the EPC a band |
| Works standards | Any works by either party (fit-out, repair, replacement) to meet a stated standard: like-for-like or better efficiency, specified minimum ratings for plant, low-carbon materials, waste diversion | Both | Plant replaced at end of life with the cheapest equivalent, locking in the old performance for fifteen years |
| Cost recovery | The service charge to include the amortised cost of efficiency improvements, capped by reference to the savings they produce, over a stated period | Tenant pays, landlord invests | Landlord will not fund improvements the tenant benefits from; the split incentive |
| Cooperation | A forum (building management committee or annual review) to agree an environmental management plan, targets and a works programme; reasonable endeavours to improve performance; landlord and tenant to give each other access and information | Both | Nobody looks at the data, nobody owns the plan, and the building drifts |
Two further families appear in dark-green leases and in the 2024 toolkit: net zero alignment (a shared target for the building, with a pathway), and social value or biodiversity provisions. They are less common and are treated below as extensions of the cooperation clause.
Sample clauses annotated
The wording below is drafted to show the structure of each clause and the choices inside it. Square brackets mark the points a landlord will negotiate. The annotations explain what each element is doing; the parties' solicitors should settle the final text.
Data sharing clause (energy)
Data sharing. The Tenant shall, within [20] Working Days after the end of each [quarter], provide to the Landlord in [the Landlord's reasonable electronic format] the metered consumption of electricity, gas and water at the Premises for that period, together with any invoices from the relevant supplier on request. The Tenant consents to the Landlord using such data (a) to calculate the environmental performance of the Building, (b) to comply with any statutory reporting obligation, and (c) to report to the Landlord's investors, lenders and certification bodies, in each case on an aggregated or anonymised basis where reasonably practicable. The Landlord shall provide the Tenant with the equivalent data for the common parts and central plant, and the Building's overall performance, on the same basis. Neither party shall be in breach of this clause by reason of a supplier's failure to provide data, provided it has used reasonable endeavours to obtain it.
The data sharing clause energy provision does five jobs. The frequency and deadline (quarterly, twenty working days) match the reporting cycle the landlord actually runs; a clause that says "on request" produces nothing. The format clause lets the landlord specify a spreadsheet or a utility data portal rather than a PDF of a bill. The consent limb is the one most often missing, and without it a tenant can share the data and still object to the landlord putting it in a GRESB submission or a Local Law 97 filing. The reciprocal limb makes the clause acceptable to tenants, who increasingly need the building's data for their own Scope 3 reporting. The supplier carve-out stops the clause failing on a technicality when a utility is late.
Where the landlord has installed sub-meters it controls, the clause is shorter: the tenant consents to the landlord reading the meters and using the data. Where the tenant contracts directly with a supplier, the landlord may also ask for a letter of authority so it can obtain the data from the supplier itself. How that data is then collected and cleaned is covered in our guide to utility data for ESG reporting.
Alterations clause
Environmental impact of alterations. The Tenant shall not carry out any alterations to the Premises which would, in the reasonable opinion of the Landlord, adversely affect the Energy Performance Rating of the Premises or the Building [or the Building's environmental performance]. Where the Tenant applies for consent to alterations, the Landlord may require the Tenant to provide, at the Tenant's cost, an assessment by a suitably qualified person of the likely effect of the alterations on the Energy Performance Rating, and may grant consent subject to reasonable conditions designed to prevent any adverse effect.
The defined term Energy Performance Rating is the point: in the UK it should be defined by reference to the EPC and, from 2031, to the rating the landlord needs to hold for the MEES commercial EPC rules. The "reasonable opinion" standard, rather than an absolute bar, keeps the clause workable; an absolute bar would catch every partition. The assessment requirement pushes the cost of proving no harm onto the tenant, which is the party proposing the change. The clause interacts with the licence-to-alter process described in our guide to office fit-out management, where the energy assessment becomes one of the consultants' reports the landlord reviews.
Works standards clause
Standard of works. Where either party carries out works of repair, replacement or improvement to the Building or the Premises, it shall, so far as reasonably practicable and cost-effective: (a) select plant, equipment and materials of equal or better energy and water efficiency than those replaced; (b) comply with [the Landlord's Sustainability Fit-Out Guide] as updated from time to time; (c) divert not less than [75]% by weight of construction waste from landfill; and (d) on completion provide the other party with the specification, commissioning certificates and operating manuals for any plant installed.
"Equal or better" is the minimum that prevents backward steps. The fit-out guide reference lets the landlord update the standard without varying every lease, provided the guide is available and reasonable. The waste percentage is the one measurable item and should match what the landlord's contractors can evidence. Limb (d) is the operational one: the landlord needs the commissioning data to run the plant and to update the EPC modelling.
Cost recovery clause
Recovery of the cost of Environmental Improvements. The Service Charge may include the cost of Environmental Improvements, being works to the Building or its plant which are reasonably expected to reduce the consumption of energy or water or the emission of greenhouse gases, provided that: (a) the cost is recovered in equal annual instalments over [the lesser of the expected useful life of the works and [10] years]; (b) the annual amount recovered from the Tenant does not exceed the Tenant's proportion of the reasonable estimate of the annual savings in operating costs produced by the works, as certified by [the Landlord's surveyor / an independent consultant]; and (c) the Landlord has consulted the Tenant on the works and the estimate before commencing them.
This is the clause that changes the economics, and it is discussed in its own section below.
Cooperation clause
Environmental management. The Landlord and the Tenant shall meet not less than [once] in each year to review the environmental performance of the Building, to agree an environmental management plan including targets for energy, water and waste and a programme of works, and to consider the data shared under this Lease. Each party shall use reasonable endeavours to comply with the plan and shall give the other such access and information as is reasonably required for that purpose. Neither party shall be liable in damages for failing to meet a target in the plan, but a failure to attend the review or to provide the data required by this Lease shall be a breach.
The last sentence is what makes a light-green clause enforceable without making the targets themselves actionable. The obligations that carry consequences are the procedural ones: turn up, share the data, cooperate on the plan. The targets are agreed outside the lease and can be changed each year without a deed of variation.
Light-green vs dark-green
The industry distinguishes green lease clauses by how much they bind.
Light-green clauses oblige the parties to cooperate, share data, meet and use reasonable endeavours. They set no measurable target inside the lease, and a failure to improve performance is not a breach. They are the starting point for a landlord adding green clauses to a standard form for the first time, and for a multi-let building where the tenants range from a bank to a barber. The 2024 toolkit's essentials tier is light-green.
Dark-green clauses set targets in the lease itself (an EPC rating to be maintained, a percentage reduction in energy intensity, a net zero date for the building) and attach consequences: a rent adjustment, a right for the landlord to carry out works at the tenant's cost, a restriction on assignment, or a break. They appear in single-let buildings, in pre-lets where the tenant has its own net zero commitment, and increasingly in leases to public sector and listed occupiers whose own reporting requires it.
Most leases end up between the two. A common mid-green position is a light-green structure with two dark-green elements: an absolute obligation on the tenant not to reduce the EPC rating through alterations, and a cost recovery clause that lets the landlord fund improvements. That combination is what lets a UK landlord plan for 2031 without renegotiating every lease, and it is what a US landlord needs to keep a building inside its emissions limit under a law like Local Law 97 or BERDO, where the penalty for the building's emissions falls on the owner whatever the tenants do.
The drafting test for either shade is the same: read each clause and ask what happens if the other party ignores it. If the answer is nothing, it is a statement of intent, not a green lease clause, and it will not help when the landlord needs access to a let floor in 2030.
Cost recovery for efficiency works
The split incentive is the problem every green lease is trying to solve. The landlord pays for a more efficient boiler; the tenant pays the gas bill and takes the saving. Under a standard UK lease the landlord cannot recover the boiler through the service charge, because the RICS Professional Statement on service charges in commercial property, and most leases drafted under it, exclude improvement (as opposed to repair and replacement) from recoverable costs. The result is that landlords repair the old boiler indefinitely.
The cost recovery clause above solves it in three moves. It brings environmental improvements into the service charge expressly, so the improvement exclusion does not bite. It amortises the cost over a period (the useful life or ten years, whichever is shorter), so the tenant does not face a capital sum in one year. And it caps the annual recovery at the tenant's share of the estimated saving, so the tenant is never worse off in cash terms than it would have been without the works.
Worked example. A landlord replaces the lighting in a 40,000 square foot multi-let office with LED fittings and controls at a cost of £120,000. The consultant's estimate is an annual electricity saving of £30,000 across the building. Under the clause, the landlord recovers the cost over eight years (the shorter of the useful life, estimated at ten years, and the eight years left on the longest lease), which is £15,000 a year. Recovery is capped at the annual saving, £30,000, so the full £15,000 is recoverable. A tenant with 25% of the building pays £3,750 a year through the service charge and saves £7,500 a year on its electricity, a net gain of £3,750. The landlord recovers its outlay in full over the term and holds a building with a better EPC and lower operating cost at the next letting. Without the clause, the tenant would have gained £7,500 a year and the landlord would have written off £120,000.
The clause needs three supporting mechanics to survive a dispute. The saving estimate must be certified by someone the lease names, and the tenant should have a right to challenge it through the service charge dispute procedure rather than by withholding. The consultation step must be evidenced, because the RICS statement requires consultation on works of this kind and a tribunal will look for it. And the amortisation schedule must be recorded as its own line in the service charge budget, separate from repair, so that the reconciliation shows exactly what was recovered against which works. How that budget and reconciliation are built is in our guide to the office service charge budget.
US leases reach the same result through the operating expense definition. A green lease operating expense clause permits the landlord to include the amortised cost of capital improvements that reduce operating expenses, or that are required by a law enacted after the lease date, capped at the savings achieved. The second limb matters: an improvement required to comply with an emissions law that post-dates the lease becomes recoverable even where the saving does not cover it.
Tracking obligations in the lease record
A green lease clause that is not tracked is a clause that is not performed. The data sharing clause produces a quarterly deadline for each tenant; the cooperation clause produces an annual meeting and a plan with dated actions; the alterations clause produces a condition on each licence to alter; the cost recovery clause produces an amortisation schedule and a saving estimate that has to be certified and, in most leases, revisited. None of those is a rent date, and none of them appears in a conventional lease abstract.
The lease record therefore needs, for each green clause: the obligation, the party it falls on, the frequency or trigger, the deadline, the format of what is due, the owner within the management team, and the evidence file. For a data sharing clause that is a quarterly task per tenant with the received data attached; for a cooperation clause an annual event with the agreed plan attached; for a cost recovery clause the amortisation schedule and the certification. The abstract field list in our lease abstraction checklist should be extended with those items on any lease that has green provisions.
In RIOO on NetSuite, the leasing management module holds the executed lease with its documents searchable, carries custom clauses on the lease record, and sends automated reminders for renewal deadlines, inspections and other dated obligations, which is where the data sharing and review dates belong. The consumption data the tenant shares is recorded in the utility and asset management module against the building's utility accounts and meters, alongside the landlord's own readings, so the whole-building figure is in one place. The amortised recovery under the cost recovery clause runs through the service charge in the same way as any other budgeted line.
Frequently asked questions
Q1. What are green lease clauses?
Provisions in a commercial lease that oblige the landlord and tenant to cooperate on the building's environmental performance. The five main families are data sharing (each party gives the other its consumption data), alterations (the tenant may not reduce the building's energy rating), works standards (repairs and replacements must be at least as efficient), cost recovery (efficiency improvements can be recovered through the service charge, capped at the savings) and cooperation (an annual review and an agreed plan).
Q2. What is the difference between a light-green and a dark-green lease?
A light-green lease obliges the parties to share data, meet and use reasonable endeavours, but sets no measurable target in the lease and attaches no consequence to performance. A dark-green lease sets targets (an EPC rating, an energy reduction, a net zero date) with consequences such as a rent adjustment, landlord works at the tenant's cost or restrictions on assignment. Most leases sit between the two.
Q3. Can a landlord recover the cost of energy efficiency works through the service charge?
Only if the lease says so. Standard UK leases exclude improvements from the service charge. A green lease cost recovery clause brings environmental improvements in, amortises the cost over the useful life or a fixed period, and caps the annual recovery at the tenant's share of the estimated savings, so the tenant is not out of pocket. US leases do the same through the operating expense definition.
Q4. Where can I find model green lease clauses?
In the UK, the Better Buildings Partnership Green Lease Toolkit, reissued in January 2024, contains model clauses, heads-of-terms wording and guidance. In the US, the Green Lease Leaders programme publishes recognition criteria and reference language. Both are menus to select from rather than templates to adopt whole.
Q5. Are green lease clauses enforceable?
Yes, to the extent they are drafted as obligations. A clause requiring the tenant to provide quarterly consumption data by a deadline is a covenant and its breach can be enforced like any other. A clause stating that the parties "aspire to" a target is not. The drafting choice is whether to make the procedural obligations (share data, attend the review, cooperate on the plan) enforceable while leaving the targets themselves outside the lease.
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