Using an approved, secure lockbox should not negatively affect your insurance and may strengthen your position. Insecure key storage, such as leaving a key under a doormat or in a plant pot, can invalidate your property insurance in the event of a break-in. Some insurers require key safes that meet specific security standards, such as Secured by Design or LPCB certification. Smart locks with access audit trails can further support your insurance claim by demonstrating controlled entry. Always notify your insurer before installing any access system and confirm what standards they require.