Cost, Comparison & the Models
Lean vs Single vs Multi Family Office: Which Model Fits
Single, multi and Lean Family Office models compared by operating design: who coordinates the whole, what the family owns, and why each model can fit.
Overview
The three main family office models are the single-family office (a dedicated in-house team), the multi-family office (shared across several families), and the Lean Family Office (coordination owned by the family without a full staff). They differ on cost, control, and ownership. The right one depends on your wealth, complexity, and how much you want to own versus outsource.
Most comparisons treat the choice as a question of size. A more useful comparison asks how the family wants the office to operate: what should be internal, what should be outsourced, who owns coordination, and how much institutional infrastructure the family actually wants.
What are the three family office models?
The three models are distinguished by who staffs the office and who owns the result. A single-family office (SFO) is a dedicated team employed by one family. A multi-family office (MFO) is a firm serving several families from a shared team. A Lean Family Office (LFO) coordinates external specialists through a small owned function, giving the family the office without the payroll.
Each solves the coordination problem differently. The SFO owns the whole institution. The MFO rents access to a shared one. The LFO owns the coordination and the data while renting the specialist depth. The trade-offs follow from that difference.
How do they compare?
| Single-family office | Multi-family office | Lean Family Office | |
|---|---|---|---|
| Centre of gravity | Dedicated internal institution | Shared provider service | Family-controlled operating model |
| Coordination | Internal | Provider-led | Operator-led |
| Internal capability | Higher | Low | Minimum viable core |
| Specialist capability | Internal + external | Shared provider team | Fractional where appropriate |
| Operating infrastructure | Family-controlled | Predominantly provider-led | Family-controlled |
| Portability | Depends on system design | Depends on provider terms | Explicit design requirement |
| Best when | Family wants its own institution | Family wants a broad outsourced service | Family wants to own the operating model without unnecessary institution |
(SFO cost figures per J.P. Morgan and UBS benchmarks. Lean economics depend on the family's existing people, bench and workload, so no single ratio applies.)
When does each model fit best?
A single-family office fits when a family genuinely needs and wants sustained internal capability across enough functions to justify its own institution. A multi-family office fits when the family wants a broad outsourced service from one provider. A Lean Family Office fits when the family wants to retain control of the operating model and institutional record while using specialist capability deliberately rather than defaulting to a large internal team.
The trade-off at the heart of the choice
The choice is not a ladder and it is not a contest. It is an operating-design decision. Ask what the family wants to own, where accountability should sit, how much work genuinely needs to be internal, and what should happen if a provider changes.
How do you decide?
Decide by ranking cost, control, and convenience for your family, then matching the model that protects your top priority. If control and ownership rank highest and the wealth doesn't justify a full institution, that points to Lean. If convenience ranks highest, an MFO. If you have the scale and want your own institution, an SFO. The comparison pillar walks the decision in more depth.
Frequently asked questions
What is the difference between a single and multi family office?
A single-family office is a dedicated team employed by and serving one family, offering maximum control and customisation at the highest cost. A multi-family office is a firm serving several families from a shared team, offering a ready-made service at lower, cost-shared expense but with less control and often less data ownership. A Lean Family Office is not the midpoint between an SFO and an MFO. It is a different architecture: family-controlled operating infrastructure, an accountable Operator and specialist capability engaged deliberately around the system.
What is a Lean Family Office compared to a multi-family office?
A Lean Family Office is owned by the family and coordinates external specialists through a small owned core, keeping the data and the system with the family. A multi-family office is a shared firm the family is a client of, which typically holds the system and standardises the service. The core difference is ownership: with Lean, the picture stays with the family; with an MFO, it usually stays with the firm.