AGE 18
When can I lease a flat?
You can sign a lease or tenancy agreement at any age, but if you are under 18, the landlord cannot make you carry out the agreement if it is unfair or unreasonable (unless you are or have been married or in a civil union). Most landlords will not let their properties to under 18s, unless someone over that age signs the tenancy agreement as a “guarantor”. The guarantor then has to pay the rent, the cost of any damage to the property and other obligations under the tenancy if the young person does not do these things.
(s6 Minors’ Contracts Act 1969; s14 Residential Tenancies Act 1986)

AT ANY AGE
Can a landlord refuse a flat to my family because there are children?
No, it is against the law for a landlord to refuse to rent a flat to your parents/caregivers or guardians, just because you, a child, will be living there. Discrimination on the basis of age is a violation of the Human Rights Act 1993 if you’re over 16.
(s12(1) Residential Tenancies Act 1986, s21(1)(l) Human Rights Act 1993)

AT ANY AGE
When can a landlord enter my flat?
In general, your landlord can never enter your flat without your permission, whatever your age. There are exceptions: your landlord can enter in cases of emergency; when she or he has given you notice at least 2 days in advance; or if she or he has given you 24 hours notice and there are necessary repairs to be made to your flat.
(s48 Residential Tenancies Act 1986)