The Better Buildings Partnership (BBP) Green Lease Toolkit is the UK property industry standard framework for tenant-landlord agreements on building improvements — including solar PV. For the 70%+ of UK warehouse stock held on FRI leases, the BBP Green Lease Toolkit is what makes tenant-installed solar possible: it provides the standard clauses, consent process, and end-of-lease handling that institutional landlords (Prologis, Tritax Big Box REIT, GLP, Blackstone, Segro) now accept as default. This guide explains how the BBP Green Lease Toolkit governs warehouse solar, the standard solar addendum, and how to navigate landlord consent.
What is the BBP Green Lease Toolkit?
The Better Buildings Partnership (BBP) is a collaboration of the UK leading commercial property owners — including British Land, Landsec, Prologis, Segro, Grosvenor, Legal & General, and Aviva Investors — working to improve the sustainability of commercial building stock. The BBP Green Lease Toolkit, first published in 2013 and updated regularly, provides standardised lease clauses and memoranda of understanding covering: energy and water data sharing; cost recovery for sustainability improvements; building improvements including renewable energy; and end-of-lease handling. The Toolkit is the de facto industry standard — institutional landlords use its model clauses as the baseline for tenant solar agreements, which is why landlord consent for warehouse solar has become standardised and faster (typically 4-8 weeks in 2026 versus 12-16 weeks in 2020).
The standard BBP solar PV addendum — what it covers
The BBP Green Lease Toolkit standard solar PV addendum (or memorandum of understanding) covers seven core areas. (1) Installation rights: tenant right to install solar PV at own cost during the lease term. (2) Roof access: tenant right of access for installation and ongoing O&M throughout the term. (3) Structural certification: tenant responsibility to provide Chartered Structural Engineer certification confirming roof load capacity. (4) Insurance: tenant adds solar PV to building insurance; landlord notified; liability for solar-related damage allocated. (5) Roof maintenance: tenant responsibility for any roof works disturbed by panels during the term. (6) End-of-lease options: three standard scenarios (leave installed, remove and make-good, or transfer ownership to landlord). (7) Performance and generation data sharing: both parties access monitoring data for ESG reporting. Most institutional landlords accept the standard BBP template with only minor amendments.
Landlord consent process and timeline
The BBP Green Lease Toolkit has standardised the landlord consent process for tenant warehouse solar. Typical 2026 timeline: Week 1-2 — tenant submits solar proposal with system design, structural pre-assessment, and proposed BBP-aligned addendum. Week 2-4 — landlord property and sustainability teams review against BBP standard. Week 4-6 — landlord legal review (typically £2,000-£5,000 legal cost, often recovered by tenant via standard alteration deed). Week 6-8 — consent granted, addendum executed. For institutional landlords with BBP membership (Prologis, Tritax, GLP, Segro, Blackstone), the process is fastest because they have pre-approved BBP-based templates. For smaller private landlords without BBP familiarity, the process can extend to 10-16 weeks as they take external advice. We prepare the full BBP-aligned addendum and structural documentation as standard, which typically accelerates consent.
End-of-lease handling — three standard scenarios
The BBP Green Lease Toolkit defines three standard end-of-lease scenarios for tenant-installed solar. (1) Leave installed (institutional default): tenant leaves the solar PV system in place at lease end. The new tenant inherits the system (typically at nominal or zero cost). The tenant captures full lease-term benefit. Most institutional landlords prefer this because the building retains its EPC uplift and ESG positioning — solar is an asset enhancement. (2) Remove and make-good: tenant removes panels and restores the roof to original condition at lease end. Significant cost (£30-£80/sqm of installation area for removal + roof repair) — reduces lease-term economics. Typically required only by small private landlords. (3) Transfer to landlord: tenant transfers ownership to landlord at lease end, often at agreed market or nominal value. Landlord assumes O&M responsibility post-handover. Hybrid model — tenant captures lease-term benefit, landlord captures post-lease residual value. The scenario is agreed upfront in the BBP addendum.
How the BBP Toolkit affects warehouse solar financing
The end-of-lease scenario agreed under the BBP Green Lease Toolkit directly affects which financing route works. For "leave installed" or "transfer to landlord" arrangements with 10+ years remaining lease: outright purchase or asset finance both work — the tenant realises full payback within the term. For shorter leases (under 8 years remaining): a Power Purchase Agreement (PPA) is typically preferred — the PPA transfers to the next tenant at lease end (subject to assignment terms in the BBP addendum), avoiding stranded-asset risk. The BBP Toolkit standardises PPA assignment clauses, which is why PPA-financed tenant solar has become viable on institutional warehouse estate. We model all three financing routes against your specific lease term and BBP addendum terms as part of feasibility.
Institutional landlord BBP adoption — who accepts tenant solar
Major UK institutional warehouse landlords with established BBP Green Lease Toolkit adoption for tenant solar in 2026. Prologis UK: standard green lease with solar addendum, fastest consent (BBP founding member). Tritax Big Box REIT: standard BBP-based solar consent process. SEGRO: BBP founding member, well-established tenant solar framework. GLP (Gazeley): standard tenant solar addendum. Blackstone (Mileway, St Modwen Logistics): BBP-aligned consent. Legal & General Investment Management: BBP member, supportive of tenant renewables. Aviva Investors: BBP member. Federated Hermes: supportive. For tenants on estate owned by these institutional landlords, tenant solar consent is now a standardised 4-8 week process. We have completed 60+ tenant-installed warehouse solar projects across major institutional portfolios using BBP-aligned addenda.
Common questions about bbp green lease toolkit
What is the BBP Green Lease Toolkit?
The Better Buildings Partnership (BBP) Green Lease Toolkit is the UK property industry standard framework for tenant-landlord agreements on sustainability improvements including solar PV. It provides standardised lease clauses for installation rights, roof access, structural certification, insurance, and end-of-lease handling. Institutional landlords (Prologis, Tritax, SEGRO, GLP, Blackstone) use it as the baseline for tenant solar consent.
Can I install solar on a leased warehouse under the BBP Toolkit?
Yes — the BBP Green Lease Toolkit is specifically designed to enable tenant-installed solar on leased commercial property. It provides the standard solar addendum that institutional landlords accept. Typical consent timeline is 4-8 weeks for BBP-member landlords. We prepare the full BBP-aligned addendum and structural documentation as standard.
How long does BBP landlord consent take for warehouse solar?
For institutional landlords with BBP membership (Prologis, Tritax, SEGRO, GLP, Blackstone): typically 4-8 weeks. The process: tenant submits proposal + BBP addendum (weeks 1-2), landlord review (weeks 2-4), legal review (weeks 4-6), consent and execution (weeks 6-8). Smaller private landlords without BBP familiarity can take 10-16 weeks.
What happens to the solar at end of lease under the BBP Toolkit?
Three standard scenarios. (1) Leave installed (institutional default): tenant leaves system in place, new tenant inherits it. (2) Remove and make-good: tenant removes panels and restores roof (£30-£80/sqm cost). (3) Transfer to landlord: tenant transfers ownership at agreed value, landlord assumes O&M. The scenario is agreed upfront in the BBP addendum. Most institutional landlords prefer "leave installed" as solar is an asset enhancement.
Does the BBP Toolkit allow PPA-financed tenant solar?
Yes — the BBP Green Lease Toolkit standardises PPA assignment clauses, which is what makes PPA-financed tenant solar viable on institutional warehouse estate. For shorter leases (under 8 years remaining), a PPA can transfer to the next tenant at lease end, avoiding stranded-asset risk. This is the preferred route for short-lease tenants.
Which warehouse landlords accept BBP tenant solar?
Major institutional landlords with established BBP tenant solar frameworks: Prologis UK (founding member, fastest consent), Tritax Big Box REIT, SEGRO (founding member), GLP/Gazeley, Blackstone (Mileway, St Modwen Logistics), Legal & General, Aviva Investors, Federated Hermes. For tenants on estate owned by these landlords, solar consent is a standardised 4-8 week process.