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Commercial Solar Finance UK · Independent
Q&A · Timing

How long does commercial solar finance approval take? — UK 2026

Commercial solar finance approval times vary from 24 hours (asset finance indicative) to 6-12 weeks (green loan or PPA). The full project timeline from enquiry to commissioning typically runs 14-30 weeks because finance approval is rarely the binding constraint — DNO connection process, EPC procurement, and construction usually take longer.

Approval timeline by finance structure

StructureIndicative decisionFull credit committeeDrawdown / commercial close
Capital purchase (no finance)ImmediateN/AImmediate
Asset finance HP24-72 hours7-10 days14-21 days
Asset finance broker24-48 hours7-14 days14-21 days
Green loan (challenger)3-7 days2-4 weeks4-6 weeks
Green loan (mainstream)2-3 weeks4-6 weeks6-8 weeks
Finance lease1-2 weeks2-4 weeks4-6 weeks
Operating lease1-2 weeks3-5 weeks4-8 weeks
PPA2-4 weeks (term sheet)6-10 weeks (contract)8-12 weeks (signing)
PSDS grantN/A (windowed)8-16 weeks per window12-24 weeks (award + contract)

What slows approval down (and how to avoid it)

Six common delays in UK commercial solar finance approval:

  1. Stale or incomplete management accounts

    Lenders need most-recent year-end accounts plus YTD management accounts. If these are 6+ months old or incomplete, expect 2-3 weeks of delay while finance team prepares fresh information.

  2. Missing project financial model

    Lenders need a project-level cash flow model showing electricity savings, capex breakdown, and finance servicing capacity. If you don't have one, the lender may build one — adding 2-4 weeks. Better to provide your own at outset.

  3. DNO connection not yet resolved

    Lenders won't commit to financing a project where DNO connection (G99 above 200 kWp) is unresolved. Get a DNO position confirmed (or at least applied for) before finance application.

  4. Structural assessment outstanding

    Larger systems (>200 kWp) require structural roof assessment. Lenders need this before approving full credit. Schedule the structural survey early in the project timeline.

  5. Covenant package interaction with new debt

    Existing senior debt covenants may restrict new debt-equivalent obligations. Confirming covenant compatibility with your existing bank takes 2-4 weeks. Start early.

  6. Sustainability / ESG due diligence on green loans

    Specialist green debt funds (Triodos, Charity Bank) include sustainability assessment. Adds 2-3 weeks vs mainstream commercial bank. Worth the time for the values-aligned positioning but plan for the extra.

Speed-critical scenarios

When speed is the primary constraint:

  • Year-end FYA capture pressure — order before September for typical March year-end commissioning. Asset finance for fastest route. FYA deadline calendar →
  • Supplier discount window — typical 30-60 day discount validity. Asset finance HP indicative within 24-72 hours, full credit within 7-10 days. Possible to close inside 30 days.
  • PSDS application deadline — Phase 4 windows are 8 weeks open. Finance arrangement parallel to grant application, with finance contingent on grant award.
  • Tenant lease renewal window — solar capex / rent abatement provisions need to align with lease negotiation. Finance arrangement after lease structure agreed.

Related questions

Can asset finance approval really happen in 24 hours?
Indicative yes for established trading customers with clean credit history. Full credit committee approval is 7-10 days; full drawdown another 7-14 days. The 24-hour indicative is a soft commitment letting you proceed with project planning, not a binding commitment to fund. Plan around the 14-21 day full timeline.
How fast can a green loan close on a £200k commercial solar project?
Challenger banks (Allica, OakNorth, Aldermore): 4-6 weeks for established customers. Mainstream UK clearing banks (NatWest, Barclays, Lloyds, HSBC): 6-8 weeks typical. Specialist green funds (Triodos, Charity Bank): 8-10 weeks including sustainability due diligence.
Is PPA contract negotiation really 6-12 weeks?
Yes for properly negotiated contracts with 10+ specific terms (tariff, escalator, buyout right, term length, performance guarantee, change-of-control, etc.). Boilerplate "rubber-stamp" PPAs can close in 4-6 weeks but typically leave value on the table. Worth taking the negotiation time.
What's the longest end-to-end commercial solar project timeline?
PSDS-funded multi-site portfolio with bundled measures: 12-24 weeks for application + award; 24 weeks for procurement + delivery; total 36-48 weeks from initial enquiry to commissioning. Private-sector single-site capital purchase: 14-20 weeks typical. Plan around the longest reasonable case.
Should I start finance arrangement before or after EPC procurement?
Run them in parallel. Get an indicative finance position (asset finance HP at 24-72 hours, green loan term sheet within 2-3 weeks) while you run EPC procurement. By the time you select an EPC contractor, finance should be at full credit committee. Concurrent processes typically save 4-6 weeks vs sequential.

Continue reading

Asset finance lender shortlist

UK lenders ranked by decision speed.

Green loan lender comparison

Decision speed alongside rate for six UK lender categories.

FYA deadline planning calendar

Month-by-month timeline for capturing the 50% FYA before 31 March 2026.

Want this applied to your specific situation?

We model the relevant finance structures against your project numbers. Five working days from enquiry to indicative comparison across capital purchase, green loan, lease, and PPA.

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