Solar panels for multi-tenant office buildings |…

Why multi-tenant office buildings need a specialist approach

Multi-tenant office buildings (multi-let) are the largest single class in the UK commercial office stock. Service-charge structure and tenant supply arrangements drive both the technical design and the legal structure of the install.

Technical detail

Three structural approaches dominate: (1) landlord install with service-charge cost recovery (electricity supplies landlord-controlled areas only), (2) sleeve PPA with electricity supplied directly to tenants via building MPAN, (3) green-lease addendum where a single anchor tenant funds capex with landlord consent. We have delivered all three across 40+ multi-let installations.

What we deliver

For every multi-tenant office buildings project we structure a complete service: free half-hourly meter data feasibility study including structural loading assessment to BS EN 1991, fixed-price proposal, planning route confirmation, DNO G99 application, MCS-certified install with appropriate mounting system for the building type, commissioning to IEC 62446, and a Scope 2 Disclosure Pack for ESG reporting.

The three structural approaches for multi-tenant solar

Multi-tenant office buildings (multi-let) are the largest single class in the UK commercial office stock. Around 8,000 buildings of 2,000+ sqm each. Service-charge structure and tenant supply arrangements drive both the technical design and the legal structure of the install.

Approach 1: Landlord install with service-charge recovery

Landlord funds and owns the PV system. Electricity supplies landlord-controlled areas (lifts, corridors, plant, common parts). Capex recovered via service charge as a reduction in electricity cost flowing through to tenants.

Pros: Simplest legal structure. No tenant individual agreements needed. Service charge follows established RICS 2018 framework.

Cons: Only landlord-controlled areas benefit. Typically 25-40% of total building electricity, so system size limited to that demand. Remainder of generation exports to SEG at low tariff.

Approach 2: Sleeve PPA with tenant supply

Landlord (or third party) installs and supplies electricity directly to one or more tenants via the building's MPAN. Each tenant signs a long-term PPA contract.

Pros: Captures full economic value of generation. Tenants get electricity below grid retail. Strong tenant attraction and retention signal.

Cons: Individual tenant agreements required. May trigger Class Exemption Order under Electricity Class Exemptions Order 2001 if supplying multiple tenants. Renegotiation needed on each tenant turnover.

Approach 3: Tenant install with green-lease addendum

An anchor tenant funds the install for their own consumption. Landlord grants consent via a green-lease addendum.

Pros: Tenant captures economics. Strong tenant ESG signal. No landlord capex commitment.

Cons: Only works where one tenant occupies most of the building. Lease-end transfer of asset is the main negotiating point.

Service charge schedule structuring

For landlord-led installs, service charge recovery requires specific lease provisions and a transparent communication strategy. Our standard service charge schedule covers:

Capex amortisation over 7-10 year notional life
Reasonable maintenance and monitoring costs
Insurance allocation
Net presentation: gross capex amortisation less savings = service charge impact
Annual reconciliation against actual electricity savings

RICS Professional Statement on Service Charges in Commercial Property 2018 requires transparency, reasonableness, and prior tenant consultation. We provide all three in standard documentation.

Tenant communication timeline

Typical multi-tenant install communication runs:

Month -6: Initial tenant notification with project rationale (MEES 2030, sustainability, cost reduction)
Month -4: Formal consultation with 60-day comment period per RICS Code
Month -2: Final design + service charge impact confirmed to tenants
Month 0: Install commences with site safety briefings
Month +2: Commissioning and tenant performance reporting setup

Common multi-tenant negotiation points

Anchor tenant agreement is usually the deciding factor. Tier-1 tenants (FTSE-100 occupiers) increasingly view solar PV positively — it supports their own Scope 2 reporting and MEES-compliance positioning of the building they occupy. Smaller tenants sometimes resist service-charge cost recovery; pre-app conversation addresses this.

Where tenants resist:

Offer voluntary opt-out from service charge contribution for shorter-lease tenants
Phase the install across multiple years to spread service-charge impact
Provide individual building EPC + MEES risk briefings to demonstrate why now

Multi-MPAN buildings

Buildings with multiple MPANs (e.g. one per tenant suite) need careful design to maximise per-MPAN self-consumption. Options:

Single PV system feeding landlord MPAN only (simpler legal, limited generation match)
PV feeds multiple MPANs via sleeve arrangement (complex legal, full generation match)
Per-MPAN sub-meter with virtual net metering — emerging UK supplier offer; check with supplier

Lease length and timing

Multi-tenant solar economics are sensitive to lease renewal cycles. Best timing:

Major lease renewal in 12-24 months → install before renewal so improved EPC supports rent review
Recently renewed leases (10-15 year terms) → install now, capture full lease term of service-charge recovery
Short remaining leases (under 3 years) → defer until post-renewal where possible