A solar installer invoice should identify the property, array and equipment, installation stage, handover documents, deposit and balance. Use this UK template for domestic or commercial solar work in 2026.
Solar installer invoice template
Supplier: [Legal details]
Customer: [Name and address]
Installation site: [ ]
Quote/design: [Reference and revision]
Invoice number and dates: [ ]
Due date: [ ]
| Description | Amount |
|---|---|
| Survey and design stage | £[ ] |
| Panels: [make, model, quantity] | £[ ] |
| Inverter/battery: [make and model] | £[ ] |
| Mounting, electrical materials and installation | £[ ] |
| Scaffolding/access | £[ ] |
| Testing, commissioning and handover | £[ ] |
| Subtotal | £[ ] |
| VAT [correct treatment] | £[ ] |
| Deposit/previous stages | -£[ ] |
| Amount due | £[ ] |
Worked stage example
A £9,000 installation is billed as £1,800 deposit, £4,500 when equipment reaches site and £2,700 after commissioning. Each invoice names the milestone and deducts prior payments from the account summary.
Identify the installed equipment
Show the panel quantity, inverter or battery model and system reference used in the quote. Do not rely on “solar installation” as the only description.
Customer-supplied or grant-funded amounts
Record who is paying each part and which legal customer receives the invoice. Do not net an expected grant or finance payment off the invoice unless the arrangement supports it.
Handover documents
Reference and attach the documents you agreed to supply, such as commissioning information, warranties, test records and system handover pack. Do not claim accreditation or certification not actually issued.
Variations
Roof condition, cable routes, distribution-board changes and battery changes can alter the scope. Record and approve the price before adding it to the invoice.
VAT and CIS
Use the VAT treatment that applies to the supply in 2026; do not assume one rate for every solar job. Commercial construction work may also involve CIS or the VAT domestic reverse charge. Check the parties and contract separately.
Final check
- Is the property and design revision shown?
- Are equipment models and quantities clear?
- Are access and electrical work included?
- Are deposits deducted?
- Are variations approved?
- Are handover documents attached?
- Is VAT treatment correct?
- Are CIS and reverse charge checked where relevant?
- Is the due date printed?
In Sendinvo the accepted quote becomes the job, and the invoices raised from it carry the deposit and payment stages. Handover documents go with the invoice email as attachments, and reminders follow up. Start a free trial to keep the system and payment record together.