The Cost Structure of a Single Family Office

Running a single family office is expensive. How expensive depends on the size of the assets, the scope of the mandate, and above all on the discipline with which the office is built and managed.

Running a single family office is expensive. How expensive depends on the size of the assets, the scope of the mandate, and above all on the discipline with which the office is built and managed. Most families set up an SFO for control and privacy. The cost conversation tends to arrive later, often too late.

This guide sets out what a single family office actually costs, what drives those costs, and what a well-structured SFO looks like in practice. One caveat before the figures. Family offices define their scope very differently, so cross-industry comparisons are imperfect. Some include lifestyle assets, others exclude them. Some internalise functions that others outsource and do not count at all. The numbers below describe central tendencies; individual situations vary substantially.

Conclusions from this guide

• A standalone SFO rarely makes economic sense below $250–500M in investable assets. Below that line, the fixed cost base starts eating into net returns.
• Operating costs run at roughly 50–60 bps for small offices (under $250M), around 40 bps for midsize ($250M–$1B), and 20–35 bps for large (above $1B). The wide variance within each size band has more to do with decisions about structure, staffing and scope than with portfolio size.
• Staffing dominates the cost base. C-level compensation alone can absorb up to 70% of a small office's operating budget. Right-sizing the leadership layer is where cost discipline starts.
• The headline "pure cost" benchmarks capture only around 57% of the true cost of running a family office once asset management fees, banking charges and lifestyle assets are factored in. Most families have never run that full calculation.

Our views at Westwick

• Variable compensation should be tied to base salary, not to AUM. A CIO running a one-billion-dollar SFO should not earn ten times what a CIO running a one-hundred-million-dollar SFO earns for the same job. And families should hire on character before competence: skills can be taught, loyalty and judgement cannot.
• A purely passive investment allocation, while cheap on paper, is often a delegation in disguise. Families do not invest to track an index; they invest to grow and preserve capital across generations. Cost discipline on the investment side has to go beyond fee compression and ask whether each external mandate still reflects a real conviction.
• Cost discipline is more than a management exercise. It is a fiduciary duty. The people running a family office are temporary stewards of wealth they did not build, accountable to the generations that built it and to those who will inherit it.

What does running an SFO actually cost?

The short answer: more than most families expect, and less than many SFOs actually spend.

Most practitioners place the minimum AUM to justify a standalone SFO between $250 million and $500 million in investable assets. Below that, the fixed cost base of a properly staffed office (investment capability, legal, tax and administrative oversight) is difficult to absorb without meaningfully eroding net returns. Campden Wealth's 2025 report puts the breakeven closer to $500 million once full service delivery is factored in. Smaller families can still build a family office. They simply need to be honest about what they are building when the budget does not match the ambition.

Industry benchmarks express operating costs as a proportion of AUM, measured in basis points. The picture across annual surveys is broadly consistent.

Sources: Campden Wealth 2025, UBS 2025, J.P. Morgan 2026. Pure operating cost only — excludes external investment management fees.

Small family office (under $250M)

Operating costs run at 50 to 60 basis points of AUM, with budgets of $1.0 million to $1.5 million per year (Campden Wealth, 2025). At these levels the standalone SFO is economically difficult: the fixed cost base is high relative to the assets, and the office cannot benefit from the scale that makes larger structures efficient.

Midsize family office ($250M – $1B)

Average pure operating costs sit at around 40 basis points (Campden Wealth, UBS, 2025), with annual budgets typically between $2 million and $3 million. This is the band in which the SFO model starts to make structural sense, provided the mandate is well-defined and the office is run efficiently.

Large family office (above $1B)

Economies of scale become apparent: average costs fall to between 20 and 35 basis points, depending on methodology, with an average annual operating budget of around $6.6 million (J.P. Morgan, 2026). One nuance: UBS finds that offices also managing an operating company run materially higher, at around 45 basis points on average.

Two further nuances rarely show up in headline benchmarks. Costs rise across generations (UBS finds first-generation offices at around 37 bps, later generations at 44 bps), and the range within each size band is wide. Two offices managing $800 million might spend $2 million or $6 million a year. The gap is rarely explained by portfolio size, almost always by decisions about structure, staffing and scope. Operating costs also rose by nearly 5% in 2024, ahead of inflation (Campden Wealth, 2025). Without active management of the cost base, drift is the default.

Where the money goes

The composition of costs matters more than the level, because it is in the breakdown that the levers for improvement become visible.

Staffing

Staffing is the dominant cost in virtually every SFO. UBS finds that staff costs account for two-thirds of pure operating expenses globally. Campden Wealth's breakdown by size is instructive: in large offices, C-level executive compensation represents around 39% of total operating costs; in midsize offices, 54%; in small offices, C-level compensation alone can absorb 72% of the operating budget. The concentration at the top is what makes the leadership layer the area where cost decisions matter most. Morgan Stanley's 2025 survey adds that 95% of investment-focused family offices keep total compensation costs below 1.9% of AUM, and 55% below 0.5%.

Investment management

Investment management is the most difficult cost to quantify accurately. Internal management consumes analyst and CIO time captured in salaries. External management generates layered fees: management, performance, and embedded fund-level costs that do not appear on the family office's income statement. Most family offices run roughly 70% in-house and 30% outsourced by decision-making authority (Goldman Sachs, 2025). J.P. Morgan puts external expenses at 25 to 28% of total operating costs, a figure that understates the true external cost once embedded fund fees are included.

Families do not invest to track an index. They invest to grow and preserve capital across generations. A purely passive allocation, while cheap on paper, is often a delegation in disguise: it removes conviction from the portfolio and reduces the family office to a low-cost custodian of market exposure. Cost discipline on the investment side cannot stop at fee compression. The harder question is whether each externalised mandate reflects a real conviction, or whether it has been retained out of habit.

Legal, tax and compliance

Legal, tax and compliance costs are substantial and frequently underestimated. UBS finds that legal and compliance costs represent around 10% of pure operating expenses, with physical infrastructure a further 8%. As complexity grows across jurisdictions, structures and family generations, so does the demand for external counsel; without centralised oversight, those costs drift upward unchecked. Office-related functions account for the largest share of outsourced expenses, between 24% and 36% (Campden Wealth, 2025).

Technology

Technology has become a meaningful and fast-growing line item. Consolidated reporting, portfolio management systems, cybersecurity and AI-driven analytics all carry recurring costs. Campden Wealth identifies technology as one of the two main drivers of cost inflation in 2024, alongside staffing. Smaller offices over-rely on generic tools and under-invest in fit-for-purpose systems; larger offices pay for redundant platforms procured in response to a specific problem and never rationalised. Both errors are common, and neither is cheap over time.

Administration and overhead

Administration and overhead — office space, back-office operations, compliance — benefit significantly from scale. Large offices spend proportionally far less on overhead (around 27% of total costs) than smaller ones (40 to 44%). For small and midsize offices, outsourcing administrative functions is often more efficient than replicating them in-house, though the outsourced model still requires careful provider selection and ongoing oversight.

What the benchmarks do not capture

The basis-point figures above refer to what UBS calls "pure cost", meaning direct operational expenses. Pure cost accounts for only 57% of total family office expenditure once asset management fees and banking charges are included. The full cost of running an SFO is nearly twice the headline operational benchmark. Citibank estimates external investment management fees alone average 1% to 2% of AUM for families using third-party managers. Add lifestyle assets (aircraft, yachts, family properties), classified as personal rather than operational, and the true all-in cost is materially higher than benchmarks suggest. Full-cost benchmarking is an exercise most family offices have never done.

What an intelligently built cost structure looks like

The benchmarks describe what family offices spend, not what they should spend. The gap is usually wide, and almost always the product of decisions made in the early years that were never revisited.

At Westwick, the patterns we see are remarkably consistent. The issues are rarely exotic. They are the result of accumulation: costs that were individually reasonable at inception but never challenged as a whole. A lean office is not the same thing as an intentional one. Intentional means every significant expenditure is a deliberate decision, regularly tested against the alternatives. Five structural issues come up most often.

Staffing bloat at the top

The problem we encounter most often is not understaffing. It is the gradual accumulation of senior profiles with overlapping mandates. SFOs that begin lean tend to add seniority without a corresponding increase in the scope or complexity of the work. Each hire was individually justified at the time. Collectively, they produce a leadership layer that is expensive, internally political, and slower to act than a smaller team would be. When we audit an organisation of this kind, our first step is to map roles against real responsibilities: not titles, not history, but what each person actually decides and delivers. The restructuring that follows usually reduces cost and improves execution at the same time.

Compensation alignment matters too. Remuneration tied to AUM rather than to performance is a structural incentive for expansion without accountability. Our conviction at Westwick is that variable compensation should be expressed as a percentage of base salary, not of assets under management. A CIO running a one-billion-dollar SFO should not earn ten times what a CIO running a one-hundred-million-dollar SFO earns for the same job. The capital, the risk, and the ultimate allocation decision come from the family, not from the operator.

On recruitment, we encourage the families we work with to hire on character before competence. Skills can be taught. Loyalty, ownership and judgement cannot. In a family office, where mandates are long and the work demands discretion, the cost of getting character wrong is far higher than the cost of training someone whose skills are still maturing.

Uncoordinated access to external advisers

Legal, tax and banking relationships proliferate in SFOs where no single point oversees external spend. Family members, business lines or administrative staff engage counsel directly, with no visibility into what the office is already paying or what rates have been negotiated elsewhere. Over five or ten years, the advisory budget grows by stealth, serviced by a roster of providers who have never been benchmarked against one another or the market. The answer is rarely to dismiss providers who have served the family well. It is to centralise oversight, set clear protocols for engagement, and build in regular reviews. Beyond cost, centralisation is a question of alignment. External advisers have their own commercial agendas, and without a single owner of the relationship it becomes difficult to ensure the advice the family receives is shaped by the family's interests rather than the provider's pipeline.

Fees that were never renegotiated

Banking, custody and investment management fees are usually set at inception and rarely revisited. The initial negotiation happens when the office is new and leverage is limited. As assets grow and the aggregate relationship with any given institution increases, the basis for a better arrangement strengthens. The conversation, however, rarely happens unless someone initiates it. A family office managing $500 million that trims its external management cost by 20 basis points retains an additional $1 million a year. Reinvested over two decades, the compounded value is significant.

Renegotiating does not mean compressing fees as a matter of principle. The opposite is often the right call. When a family is selling a billion-dollar asset or executing a complex international deal, hiring top-tier banks and law firms usually pays for itself. Their fees are higher, but they buy credibility with counterparts, deter opportunistic bidders, and save weeks of friction. Discipline means knowing where it is worth paying for the best, and where the family is paying premium fees out of inertia.

Portfolios that have never been rationalised

We often see SFOs holding legacy positions, typically small residential real estate assets managed directly, that consume disproportionate internal time and cost relative to their contribution. These are seldom the product of a deliberate direct-property strategy. They are the residue of historical acquisitions, often made for personal reasons, never reconsidered as the portfolio evolved. When properly modelled (all direct costs, internal time, performance against a specialist-managed equivalent), the economics rarely support continued direct ownership at small scale. The fix is usually delegation, partial disposal, or a full exit. All three tend to improve the economics and the coherence of the portfolio at the same time.

Lifestyle assets held as if they were investments

Private aircraft, yachts, second homes and similar assets are legitimate expressions of family wealth, and we are not in the business of telling families how to live. But they carry operating costs that are frequently invisible in the family office budget because they are categorised as personal rather than operational:

"It is striking that families rarely question the expenses of private planes and pilots yet frequently scrutinize family office budgets. Over time, underinvestment in professional support can lead to substantial financial shortfalls, and when compounded across generations, the effects can be monumental."

— IMD Global Family Office Report 2025

The opposite case is just as common. Overinvestment in rarely used lifestyle assets compounds in the other direction, quietly and outside any governance oversight. A private aircraft flying 150 to 200 hours per year costs several multiples of equivalent access through charter or fractional ownership, yet the total cost of ownership is rarely laid out in one place. The decision to hold such assets is ultimately personal, and not everything should be reduced to a return calculation. It should, however, be made with a clear understanding of what it actually costs.

The discipline that makes the difference

Good intentions do not run a cost base. Structure does. A well-run family office builds cost review into its governance calendar in the same way it builds investment review. At least annually, the full cost base should be examined: operating spend against budget, staff costs against market benchmarks, adviser costs against scope and alternatives, fee structures on externally managed assets against the market. The process should be owned by the principal or CEO, not delegated to the people whose compensation it might affect.

The families that manage this well treat the family office as a business to be run, not a service to be consumed. They ask, every year, whether the structure they have is the structure they would build if they were starting from scratch, and they are willing to act on the answer.

Scale is rarely what separates a well-run SFO from an expensive one. Discipline is. And cost discipline in a family office is more than a management exercise. It is a fiduciary duty. The people running the structure are not its owners. They are its temporary stewards, accountable to the generations that built the wealth and to those that will inherit it.

Sources

• Campden Wealth / AlTi Tiedemann Global, The Family Office Operational Excellence Report 2025
• J.P. Morgan, Global Family Office Report 2026
• UBS, Global Family Office Report 2025
• Citibank Private Bank, Global Family Office Report 2025
• Morgan Stanley / Botoff Consulting, Compensation Practices of Investment-Focused Family Offices 2025
• IMD Global Family Business Center, The Global Family Office Report 2025
• Goldman Sachs Wealth Management, Family Office Investment Insights: Adapting to the Terrain, 2025