Commercial landlord solar portfolio screening

Why portfolio landlords need per-asset feasibility

Commercial landlord solar portfolio assessment is fundamentally a prioritisation exercise. You cannot feasibly survey every roof in a 50-building estate, but you also cannot rely on installer proposals that cherry-pick the easiest sale. What you need is a consistent, independent test applied building by building — same scope, same standard, comparable outputs.

Stage1Energy produces fixed-fee feasibility dossiers at £1,250 per site. Each dossier ends with a pursue-or-park verdict backed by generation modelling, a 25-year financial case, and four engineering screening flags. Batch several assets in parallel and you have a ranked shortlist without open-ended consultancy fees.

Portfolio-specific challenges

Landlords face constraints that single-site owner-occupiers do not. Feasibility addresses these at screening level per building.

• Tenancy and roof rights. Who holds repairing obligations, who benefits from export revenue, and whether reinstatement is required on lease expiry all affect viability — feasibility gives the technical and financial facts for those negotiations.
• Building variety. A portfolio may span warehouses, retail units, offices, and trade counters built across decades. Each roof type carries different engineering and economic profiles.
• Capex allocation. Limited budget means ranking matters. Pursue-or-park verdicts per asset support disciplined spend on structural surveys and grid applications.
• ESG reporting. Investors and tenants increasingly expect credible site-level evidence, not portfolio-level claims unsupported by analysis.
• Installer independence. Quotes optimised for installer margin are not portfolio screening. Independent feasibility protects the landlord's position in tenant and board conversations.

What each dossier delivers for portfolio screening

Every assessment follows the same 29-page structure: concept panel layout, hour-by-hour yield, transparent 25-year cashflow, engineering flags on structure, wind, roof condition, and access, plus a written verdict reviewed before release. See the example report for the full document.

Consistency across assets is the point. When you compare a logistics unit in the Midlands against a retail parade in the South East, you are comparing like-for-like analysis — not mixed proposals from different installers with incompatible assumptions.

Outputs are board-ready feasibility screenings. They support asset management and investment committee decisions, not construction documentation.

How to run a portfolio screening programme

A practical approach for commercial landlord solar portfolio work:

• Phase 1 — Triage. Submit priority addresses for free screening to filter obvious non-starters within three working days.
• Phase 2 — Deep dive. Commission full site assessments on the shortlisted buildings — typically five to fifteen assets depending on portfolio size and budget.
• Phase 3 — Rank and allocate. Compare pursue-or-park verdicts, payback, and flagged risks. Allocate survey and grid budget to the top tier.
• Phase 4 — Tenant engagement. Use dossier outputs in landlord–tenant discussions on roof access, benefit sharing, and lease amendments where needed.

There is no volume discount — the fixed fee reflects the same human-reviewed standard on every building. Batch delivery in parallel keeps calendar time short even across many sites. There is no hard ceiling on portfolio size: programmes from a handful of assets to 80+ are sequenced and priced by enquiry — enquire about the portfolio programme.

Who uses portfolio feasibility

Typical clients include institutional real estate investors, REIT asset managers, regional commercial landlords, and property funds preparing ESG disclosures or capex plans. Consultants acting for landlords also commission dossiers per building to support client recommendations without writing analysis from scratch.

For wider context on UK commercial rooftop solar — building types, constraints, and process — see commercial rooftop solar UK.

Why fixed-fee beats open-ended consultancy

Portfolio solar screening through traditional consultancy often means scoped workshops, variable fees, and opaque models that are hard to compare across assets. Stage1Energy inverts that: one price per building, one deliverable format, one verdict standard.

A park verdict on a weak asset is as valuable as a pursue verdict on a strong one — both prevent misallocated survey spend across the portfolio. Landlords who test properly at feasibility stage spend less overall and advance fewer projects with fewer late-stage failures.

That discipline — independent, repeatable, documented — is what portfolio solar assessment should look like before a single structural engineer is appointed.

Reporting portfolio solar screening to stakeholders

Investment committees and asset management boards increasingly ask for evidence, not intentions, on renewable energy across commercial estates. A batch of feasibility dossiers gives landlords a consistent evidence pack: pursue-or-park verdicts, comparable financial outputs, and screening flags that explain why some buildings advance and others do not. That narrative is harder to assemble from disparate installer quotes received over several years.

Property managers can also use dossiers in annual reporting cycles — documenting which assets were tested, what the outcomes were, and where capex is now directed. The fixed fee per site keeps the programme predictable for finance teams setting annual sustainability budgets.

Where managing agents coordinate solar interest from multiple tenants, per-building dossiers prevent a single vocal tenant or installer from driving portfolio strategy without evidence. Each roof stands on its own economics and engineering fundamentals.

Funds preparing disposals also use feasibility on retained assets to test whether solar uplift belongs in the sales narrative — or whether flagged engineering constraints should be disclosed before marketing.