Retrofit Solar Installation Contract Template

Retrofit Solar Installation Agreement

For System Upgrades, Legacy Equipment & Existing Installations

This professional, easy-to-edit contract template is designed for solar professionals upgrading or modifying existing systems — where older panels, wiring, or hardware may already be in place.

Retrofit projects carry a different kind of risk. From outdated equipment to unknown structural issues, this agreement helps protect your business by setting clear boundaries between what you're responsible for — and what you’re not.

Created by tradespeople with real-world retrofit experience and reviewed for legal clarity, it’s written in plain terms your customers can understand, while offering the extra protection complex upgrades require.

What This Contract Helps With:

✔️ Separates You from Pre-Existing Faults
Includes disclaimers for legacy wiring, hidden roof damage, corroded fixings, and other conditions outside of your scope — so you're not held liable for issues that weren't caused by your work.

✔️ Handles Compatibility with Old Equipment
Advises the client of risks when combining old and new components — like mismatched strings, aged inverters, or underperforming panels — and sets clear expectations for results.

✔️ Covers Structural & Cosmetic Risks
Protects you when working in tight or delicate spaces, where older materials may shift, crack, or show wear during installation.

✔️ Enables Change Orders for Unseen Issues
Gives you a process to document and charge for scope changes if problems are discovered during the job — such as unsafe enclosures or non-compliant wiring.

✔️ Defines Warranty Limits for New Work Only
Prevents confusion by stating that warranty coverage only applies to the components you’ve supplied and installed — not to legacy gear.

✔️ Sets Client Declaration of Condition
Includes a section where the client confirms no damage, tampering, or modification has been done before your arrival — for your protection and peace of mind.

Example Terms & Conditions Highlights

Built from Trade Experience

✔️ Non-liability for structural issues unless caused by proven negligence
✔️ Compatibility disclaimer for old system integration
✔️ Cosmetic risk clause for working in fragile or inaccessible areas
✔️ Warranty limitation to new components and labour only
✔️ No responsibility for prior workmanship or non-compliant installs
✔️ Change Order Schedule included for unexpected on-site discoveries

…and more terms based on real-life retrofit jobs — to help prevent disputes and manage client expectations on complex upgrade projects.

When to Use This Template:

Any time you're modifying or upgrading an existing solar installation — whether you're replacing old hardware, adding new components, or working around previous installs.

Why Use It?

This isn’t a standard solar contract.
It’s designed specifically for retrofit and upgrade work — where you're stepping into someone else's project and need a contract that protects your role without confusion.

✅ Instant download
✅ Easy to edit
✅ One-time payment of £25.99 — includes unlimited use and free updates for 18 months

This agreement follows the same trusted standard as all Construction Companion templates — clear, informative terms that are easy to read, with firm but fair conditions around payment, responsibilities, and protection.

It maintains a strong balance between being approachable for clients and professional enough to protect your business.