Tenant installed solar panels on commercial/retail property without consent.

Tenant initially approached the Landlord for permission to install solar panels on the basis that this would add value to the property.

Landlord was keen but due to the complexities / uncertainties below, it seemed far too risky:
- Responsibility for ongoing maintenance

- Affect on the roof during installation (how it will be secured to the roof and who is responsible for leaks and future maintenance - as it can't be proven who is responsible)

- Affect on the roof after installation e.g. nesting birds etc.

- Impact on Landlord building insurance which landlord needs to pay

- Legal costs

- Affect on the roof, show we ask the Tenant to remove after their lease ends - again no guarantee it will be removed and the roof is put back to its original condition.

Ultimately as much as the Landlord can see the environmental / sustainability / attractiveness to future tenants, the main beneficiary is the tenant who receives lower utilities bills.

Landlord declined Tenant request but Tenant has now gone ahead with the installation.

What should the Landlord do as they seem to be in a no-win situation as this is a very small retail unit which means that any potential damage to the roof is unlikely to be covered by the deposit.

Either way, they have exposed the Landlord to a big headache, so wanted to see if anyone else has experienced this and what you did.