My experience of renting out a house was that it’s not up to the landlord to decide how much money to withhold from the deposit for damage. Our tenant of two years caused some damage and took a few fitted items from the house when she left. There had been regular inspections and we had photos taken by the property management company six months previously and at the start of the tenancy.
i think the system was that initially we did not return the deposit so the tenant could raise a dispute through the deposit scheme. We then had to fill in a report listing all the damage showing before and after photos and providing quotes for both the repairs and replacing missing items. The deposit scheme then made a ruling on what was damage and what was normal wear and tear before returning the remainder of the money.
It definitely ruled in favour of the tenant as we spent over £2000 to get the house back up to the initial condition so we could re let it and were awarded just over £500 from the deposit. However, I was happy with that, we could have saved some money by doing the cleaning and decorating ourselves and accepted that there are always costs when renting out a property. We had received rental money without issues and had a contingency fund set up to cover any unexpected bills.
The next tenants lived in the house for five years and it was absolutely immaculate when they left, no significant damage and spotlessly clean. Even so, we still redecorated and replaced the hall carpet which was getting rather worn before resetting.
Regarding the garden, as the house has a huge garden, we pay for a gardener to look after it rather than leave it up to the tenant.