Signing on behalf of someone else

Four people are taking a house. Three are in the country and one is not, so one of the three signs the agreement and writes the fourth name underneath. Everybody moves in. A year later there are arrears, and the question of who the landlord may pursue turns out to depend on something nobody discussed at the time.

The signature is not the interesting part. Authority is.

What a signature is doing

A signature is evidence that a person assented to terms. It is not the assent itself, and in most systems it is neither the only way to show assent nor conclusive proof of it. That cuts both ways: an arrangement can bind someone who never signed, and a name written by another hand does not automatically bind the person whose name it is.

What matters is whether the person who signed was acting for the absent person with that person’s authority, or merely acting about them. Those look identical on paper and are entirely different in effect.

The three routes by which an absent person becomes bound

Broadly recognised in most systems, though the names and boundaries differ:

Authority given in advance. The absent person asked, instructed, or permitted the signer to commit them. This can be explicit and recorded, or it can be a genuine understanding between the two. Where it exists, the absent person is commonly treated as a party from the outset, exactly as if they had signed themselves.

Authority the landlord was entitled to assume. In many systems a person who has been held out as able to commit another — introduced as speaking for the group, allowed to conduct the whole negotiation — can bind them as against a counterparty who reasonably relied on that appearance. This is the route that surprises people, because the absent person may never have said anything at all.

Adoption afterwards. Someone who learns what was signed and then behaves as a party — moves in, pays their share to the landlord, corresponds about the tenancy, asks the landlord for repairs — is in many systems treated as having accepted the arrangement. Conduct after the fact is capable of doing what a signature would have done, which is the same principle at work when a tenancy exists with nothing in writing.

The reverse case exists too. Where none of the three applies, the absent person may simply not be a party, however clearly their name appears. They may then be a person living there who is not named on the agreement — a position with a different and generally weaker shape.

What turns on it

WHAT TURNS ON IT — whether a signature bound the absent person

  · Whether the landlord can pursue that
    person for rent
                    → the practical core. On a joint
                      arrangement, a party can commonly
                      be pursued for the whole.

  · Whether that person can enforce
    anything against the landlord
                    → generally only a party can. A
                      non-party may have no direct
                      claim at all.

  · Whether the signer is personally on the
    hook for the absent person's share
                    → commonly yes if they signed as a
                      party, whatever they intended

  · Whether the name on the page settles it
                    → NOT SO in most systems. Authority
                      settles it; the name is evidence.

  · What counts as authority, and what form
    it must take
                    → VARIES. Some systems require more
                      formality for arrangements over
                      land. A local tenant advice
                      service can say which applies.

The signer’s own position

Worth separating out, because it is the exposure people least expect.

Someone who signs a joint agreement is normally a party in their own right. If the arrangement carries joint and several liability, that means they can be pursued for the entire rent — not for a quarter of it, and not only for their own share of a bad month. The fact that they signed as a favour to a housemate who was abroad makes no difference to the landlord’s position, because the landlord’s claim rests on the agreement rather than on the reason anyone entered it.

There is a second and quieter version. A person who signs and purports to commit others without authority can, in some systems, find that they alone are bound and the others are not. The arrangement they thought they were sharing turns out to be theirs.

The two relationships

All of the above concerns the occupiers and the landlord: who is party to the letting, who can be pursued, who can enforce. That is where authority does its work, because the landlord is the person relying on the signature.

Between the occupiers themselves the picture is separate and separately governed. Housemates may have a clear understanding that everyone carries their own share, and that understanding may well bind them as between themselves — but it does not change who the landlord may pursue, and it does not turn a non-party into a party. A signer who is pursued for the whole may have a claim against the others; that claim is a private one, in a different forum, against people who may or may not be able to pay. Whether an arrangement between occupiers has legal effect at all is a distinct question.

Where this stops

Whether a particular signature bound a particular absent person is a question of fact and local law together — what was said beforehand, what the landlord was shown, what everybody did afterwards, and what formalities that jurisdiction requires for an interest in land. No general page can answer it, and the answer differs between systems that otherwise look similar.

If it is live — because a demand has arrived, or because someone is about to sign for a housemate who is not in the room — the useful step is a tenant advice service, a housing charity, a tenancy tribunal or board, or a solicitor, and the useful things to bring are the agreement, whatever was said about who was signing for whom, and a record of who has paid whom since.