Landlord advice

As a landlord, I'm wondering if anyone can offer some advice. The EICR on my property is currently being done and it's possible due to the age of the property the whole house may need rewiring. If this is the case, obviously my tenant will need to be away from the property for this period. I'm just wondering if anyone has been through this and what sort of costs were involved. My insurance covers the cost of hotel accommodation but only up to a certain amount. I'm pretty sure the tenant is going to go into overdrive on me around this as they are not the most pleasant or understanding, despite having quite a good relationship