In this case The Ontario Court of appeals is dealing with a Resulting Trust and sets the parameters for cases of resulting trust accordingly It also deals specifically in terms of unjust enrichment and I think it's parameters would also have to be considered in both cases of resulting trust but also constructive trust
Campbell v. Campbell, 1999 CanLII 2294 (ON C.A.)
The common law has never been willing to
compensate a plaintiff on the sole basis that
his actions have benefited another.
In the process of fleshing out the concept of juristic
justification the existing law of restitution should not be
forgotten. Goff and Jones summarize and develop the various
justifications for the retention of benefits by an enriched
defendant recognized by this traditional law. Without exploring
fully the content of each of these justifications they are as
follows:
(i) the plaintiff conferred the benefit
as a valid gift or in pursuance of a valid
common law, equitable or statutory obligation
which he owed to the defendant;
(ii) the plaintiff submitted to, or
compromised, the defendant’s honest
claim;
(iii) the plaintiff conferred the
benefit while performing an obligation
which he owed to a third party or
otherwise while acting voluntarily in
his own self interest;
(iv) the plaintiff acted officiously in
conferring the benefit;
(v) the defendant cannot be restored to
his original position or is a bona fide
purchaser;
(vi) public policy precludes
Thus,
restitution, more narrowly than tort or
contract, focuses on re-establishing equality
as between two parties, as a response to a
disruption of equilibrium through a
subtraction or taking. This observation has
dual ramifications for the concept of
“injustice” in the context of restitution.
First, the injustice lies in one person’s
retaining something which he or she ought not
to retain, requiring that the scales be
righted. Second, the required injustice must
take into account not only what is fair to
the plaintiff; it must also consider what is
fair to the defendant. It is not enough that
the plaintiff has made a payment or rendered
services which it was not obliged to make or
render; it must also be shown that the
defendant as a consequence is in possession
of a benefit, and it is fair and just for the
defendant to disgorge that benefit.
[30] Based on the foregoing authorities, I have come to this
conclusion: assuming that Laura was enriched by the acquisition
of the new barn and the other improvements and that her sons had
sustained a corresponding deprivation, for them to establish that
their mother was unjustly enriched they were required to prove
that:
(1) In providing the improvements to their mother’s
farm, they prejudiced themselves with the reasonable expectation
of receiving something in return from her and that she freely
accepted the benefits conferred by her sons in circumstances
where she knew, or ought to have known, of that reasonable
expectation.
(2) Considering all of the relevant
circumstances, it would be neither just,
nor fair, to permit their mother to
retain the benefit which they conferred
on her without requiring that she
compensate them for the cost of the
The law of unjust enrichment thus construes the absence of
donative intent not unilaterally, as a subjective matter taking
place in the plaintiff’s head, but rather bilaterally, as an
inter-subjective matter taking place between plaintiff and
defendant. Forcing the defendant to disgorge the benefit
received in the absence of this bilaterality would amount to
granting the plaintiff the privilege of unilaterally constituting
another’s obligation. Unrequested benefits fall outside the law
of unjust enrichment in that, having failed to display the
required bilaterality, their disgorgement would itself be unjust.
[33] In his analysis of Pettkus at p.466, the author elaborates
this view:
The third observation, which I will now elaborate, is that
Pettkus reveals the bilaterality of unjust enrichment in that it
explicitly holds that, though necessary, the plaintiff’s merely
subjective lack of donative intent is not in and of itself
sufficient to ground the defendant’s liability in unjust
enrichment. Becker’s expectation of remuneration, even if
eminently reasonable, is not in and of itself sufficient to
generate a restitutionary remedy. Pettkus’s free acceptance of
the benefit in circumstances in which he knew or ought to have
known of Becker’s reasonable expectation is an additional
necessary element. In the absence of such acceptance on
Pettkus’s part, Becker’s claim would not have succeeded. The non-
gratuitous character of the benefit, that is, must show on both
sides. It must appear not unilaterally but bilaterally.
[34] And further at p.470 he states:
Whether in Moses or in Pettkus, granting the plaintiff’s
wish for a restitutionary remedy in the absence of such evidence
of bilaterality would have violated the equality of the parties.
The equality that normatively structures the relation between
plaintiff and defendant informs the requirement that, factually,
the plaintiff must provide evidence that the non-gratuitousness
of the benefit shows on both sides. This normatively ordained
evidentiary journey from wish to reality, from desire to right,
is that which he who confers unrequested and/or unaccepted
benefits cannot negotiate. This failure to establish
bilaterality accounts for the law of unjust enrichment’s refusal
to grant him restitution.