Single Family Office: When It Makes Sense to Build One
Written By: Ryan Morrison.
Based on a Navigating Wealth conversation with Ilka Gregory.
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Most first-generation wealth creators reach a point where the question stops being "do I have a good wealth manager" and starts being "is the structure I have built right for what comes next." The answer is not always a family office. But the question deserves a serious answer rather than the one most search results give, which is some version of "you need $100 million." That is folklore. The real answer is more practical, more pragmatic, and more honest about what a single family office is.
Key Takeaways
A single family office is a private company serving one family, legally excluded from SEC investment adviser registration when it meets the Family Office Rule criteria.
There is no clean net worth threshold. The decision turns on whether the family wants centralized control and is prepared to run what is effectively a small business.
A wealth manager and a single family office serve structurally different roles. The wealth manager is selling a service. The family office serves only the family that owns it.
Operating costs are real. Industry benchmarks place average operating costs around 0.35% to 0.45% of assets under management, with small teams averaging 10-15 staff.
At $25 million to $50 million, the right answer is usually a well-built team of external professionals plus a trusted peer community, not a family office.
The most common first-generation mistake is treating "family office" as a status milestone rather than an operating decision.
The Honest Answer to "Do I Need a Family Office?"
The honest answer is that the decision is not about wealth. It is about control, operating complexity, and willingness to run a small business across generations. Most explainers state a number, $100 million, $250 million, $500 million, as the threshold for forming a single family office. None of those numbers is wrong in every case, and none is right as a rule.
The data from major industry surveys helps calibrate. The UBS Global Family Office Report 2024 surveyed 320 single family offices with an average net worth of $2.6 billion. The Deloitte Family Office Insights Series surveyed 354 single family offices with an average AUM of $2 billion. These are not $25 million households. They are families whose wealth has compounded into a different category of complexity, where the operating overhead of a captive structure is genuinely smaller than the cost of coordinating across many external relationships.
Below that scale, the math usually goes the other direction. At $25 million to $50 million, the right answer is rarely "build a family office." The right answer is usually a well-built team of external professionals (a strong tax advisor, a wealth manager or multi-family office, a trust and estate attorney, an investment-savvy CPA) plus a peer community that can sanity-check decisions. The cost of running even a small captive structure consumes more value than it creates at that scale.
The frame that holds up across wealth levels is build versus buy. Most professional services a family office provides are buyable on the open market. Tax planning, estate work, investment management, trustee services, and household HR can all be assembled from external providers, often at a fraction of the cost of building a captive team. Building makes sense when the family wants centralized control, when the complexity has grown past what coordination across external providers can handle, and when the family is genuinely willing to run a small business. None of those criteria is a net worth number.
The mistake to avoid is treating the family office decision as a status milestone. It is an operating decision. A family that builds before the operating complexity justifies the structure has just added a permanent overhead line item without the centralization benefit that justifies it.
The rest of this guide walks through what a single family office structurally does that a wealth manager cannot, what it costs, how it invests, and how to think about setup if the decision to build is genuine.
Watch the Full Conversation
This article draws on a Navigating Wealth conversation with Ilka Gregory, president and CEO of a seventh-generation single family office founded in Brooklyn in 1866. We discuss what a single family office structurally does, how to think about build-versus-buy at the first-generation wealth stage, and what most explainers get wrong about the net worth threshold. Watch the full episode for the broader discussion.
What a Single Family Office Does That a Wealth Manager Cannot
The defining structural difference is that a single family office has no wallet-share motive, no commission incentive, and no obligation to anyone outside the family. A wealth manager, however good, is running a business that depends on growing assets under management. The family office is the family's business. That changes what is possible.
The alignment is structural, not aspirational. Under the SEC Family Office Rule, a true single family office is excluded from the definition of "investment adviser" under the Investment Advisers Act precisely because it serves only family clients, is wholly owned and controlled by family members, and does not hold itself out to the public as an investment adviser. The rule, adopted by the SEC in Investment Advisers Act Release No. 3220, was designed to recognize that families managing their own wealth do not need the protections the Advisers Act was built to provide. The family office is, by regulatory definition, the family's vehicle, not a service business.
What that alignment changes most clearly is the time horizon. A wealth manager is typically optimizing across a multi-year client relationship. A family office is optimizing across generations, sometimes literally. Ilka's office has been operating since 1866 and serves the seventh generation today. That kind of horizon allows for decisions a fee-based advisor would struggle to recommend: holding low-basis concentrated positions for decades, declining urgent deal pressure, accepting periods of inaction when the portfolio is already well-built. The "do nothing" posture is rational when the assets are already in good shape and the goal is preservation across branches and decades.
Centralized control across branches is another structural feature. A family of 80 shareholders across four branches can hold portfolios that look like one investor's, because the decisions are made centrally. That centralization is what most "secret sauce" framing really refers to. It is not a strategy. It is a structure.
The other thing a family office does that a wealth manager structurally cannot is treat the family member as a non-target. Ilka described it directly: family members can have a private banking relationship, can invest outside the family office, can use a multi-family office for personal assets. The family office is genuinely indifferent. That indifference is impossible inside a wealth manager's economics, where total wallet share is the goal. The result is candor that simply does not exist on the other side of the table.
For households still evaluating whether their current advisor relationship is the right structure, the more honest framing is usually whether wealth advisors are worth it at your stage rather than whether to build a family office. The two are often confused.
Single Family Office vs Multi Family Office vs Wealth Manager
These three structures solve different problems for different families. The single family office serves one family with full control and full operating cost. The multi-family office spreads cost and infrastructure across multiple unrelated families, trading customization for scale. The wealth manager sells a service to many clients, optimizing for repeatability rather than bespoke handling.
| Single family office | Multi-family office | Wealth manager | |
|---|---|---|---|
| Clients served | One family only | Multiple unrelated families | Many clients |
| Ownership | Family-owned | Independent firm | Independent firm |
| Control | Fully bespoke to the family | Customized within firm framework | Standardized service tiers |
| Fee structure | Operating cost; no AUM economics | AUM-based or hybrid | AUM-based, typically 0.50%-1.50% |
| Wallet-share motive | None | Limited | Strong |
| Typical scale fit | High operating wealth, multiple branches | $25M-$250M households | Across the wealth spectrum |
| Services included | Investments, tax, estate, governance, concierge | Investments, sometimes tax, estate | Investments and financial planning |
| Time horizon | Multi-generational | Long-term | Client-relationship-driven |
The economic difference is the most underrated one. A single family office runs as an operating cost, not as a fee on assets. That makes the math very different at scale: a 0.35% operating cost on a $1 billion portfolio is the same dollar amount as a 0.70% fee on a $500 million portfolio, but the family controls the structure entirely. The trade is that the family is now running a business, with the talent, technology, and operational overhead that comes with it.
For first-generation households below that scale, the comparison is usually narrower: a wealth manager versus a multi-family office. Long Angle's Professional Services Study shows how high-net-worth households use and pay for professional services at this stage, including what advisor relationships look like in practice.
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What It Costs to Run a Single Family Office
Running a single family office is running a small business, with all the operating cost that implies. Industry benchmarks help calibrate the scale. The 2024 UBS report places the average operating cost of a single family office at roughly 39.8 basis points of assets under management, with most offices employing small teams of 10 to 15 staff, sometimes fewer.
That basis-point figure is the headline number, but the composition matters more. A small family office typically requires at minimum a CEO or president, an investment lead, a head of tax, and operational support. Each is a senior hire pulling institutional-quality talent at institutional-quality compensation. The Deloitte 2024 survey found that family offices typically recruit from financial services, accounting firms, and consulting firms, in that order, with senior investment professionals often coming from prior institutional or family office roles.
The talent reality cuts harder than the compensation number suggests. The term Ilka used is "expert generalist." A family office CEO has to be conversant in investments, tax, estate planning, trust administration, family dynamics, and operations. That combination is scarce, and competing for it against banks, RIAs, and GPs, all of whom can pay more, is its own structural challenge.
The other operating cost most explainers underweight is the K-1 tax. Once a family office allocates meaningfully into private markets, every fund position generates a K-1, often late, often with adjustments, and each one has to be processed for every relevant family member or trust. That work compounds. Tech stack decisions, reporting infrastructure, and tax preparation costs all scale with portfolio complexity, and a meaningful share of the operating budget can go to administration that produces no investment return at all.
For first-generation households evaluating whether captive cost makes sense, the practical comparison is against what wealth management fees typically include at the household's current scale. That side-by-side often shows that the breakeven for building is much higher than the family initially assumes.
How a Single Family Office Invests
Single family offices typically take a long-term, control-oriented investment posture, often built around the assumption that the portfolio does not need to do anything dramatic to succeed. Ilka was direct about this: a well-managed multi-generational portfolio sometimes calls for the team to do very little, particularly when the underlying positions have compounded across decades and a forced sale would create unnecessary tax friction.
The investment behavior across the industry reflects that posture. The UBS 2024 report shows the average single family office allocating roughly 28% to equities, 22% to private equity, 19% to fixed income, 10% to real estate, and 10% to cash, with the remaining allocations spread across hedge funds, private debt, and other categories. Long Angle's High-Net-Worth Asset Allocation Report shows similar patterns at the broader HNW household level, with private and alternative allocations rising materially at higher wealth tiers.
Sourcing is where the family office structure shows up most clearly. Most senior investment professionals at family offices arrive with deep institutional relationships, and deal flow comes through those relationships rather than through inbound pitches. The structural posture toward inbound is also worth noting. Ilka's framing was that the fastest way to a no is for a GP to apply close-date pressure. Family offices are indifferent to a given deal. There is always another one. That patience is itself a competitive advantage that fee-based advisors cannot replicate, because their economics depend on activity.
The investment committee structure tends to be lean and serious. A typical family office IC includes the head of the office, the investment lead, one or two family members, and often external members from the broader family circle, including spouses and stepchildren where governance allows. The bar for committee membership is competence and trust, not bloodline. That meritocratic posture is more common than most explainers acknowledge.
When a Single Family Office Makes Sense, and When It Doesn't
A single family office makes sense when the family wants centralized control across branches and across asset types, when the operating complexity has grown past what coordination across external providers can handle, and when the family is genuinely willing to run a small business with the talent and overhead that requires. It does not make sense when those conditions are absent, regardless of the net worth on the balance sheet.
The clearest cases for building are usually families with multiple branches, generational time horizons, an operating business throwing off material cash flow that needs to be deployed deliberately, and a desire for the structure to outlast any one principal. The clearest cases for not building are first-generation households still concentrating in a primary wealth source, families without an operating business generating consistent surplus, and households where the principal does not want the operational burden that captive structures create.
The most common first-generation case is the one where the principal is being pitched on building a family office at $25 million or $50 million by a vendor whose business depends on selling the buildout. That is not always wrong, but it is rarely the right answer. The honest alternative is usually a strong external team plus a peer community where similarly situated households compare notes on the same decisions. Ilka closed her conversation by making that point directly: even high-quality external advisors are not a substitute for the kind of peer validation that families at this stage need.
For families thinking longer-term about generational transfer regardless of structure, how much to leave the next generation is a more durable question than whether to build a family office. The structural decision often follows the generational planning decision, not the other way around.
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How to Set Up a Single Family Office
If the decision to build is genuine, the sequencing matters more than the speed. The first move is defining mission and scope. The family needs to decide what the office is for: investment management only, full services including tax and estate, concierge functions, philanthropic activity, generational governance. Each layer adds operating cost, and each addition has to be justified by the family's real needs rather than by completeness for its own sake.
Hiring sequence comes next. The first hire is typically the head of the office, whether that is a president, CEO, or CIO, depending on what the family weights most heavily. The UBS 2025 data shows that the most common first hire is an investment portfolio manager, reflecting how often family offices are formed around an operating business cash flow that needs to be deployed. The second tier of hires is usually a head of tax or controller, then operational support. Beyond that, additional roles get added as complexity demands, not as a checklist.
Governance from day one is the part most families underbuild. The mission statement, the family charter, the investment committee structure, the trustee selection, the rules for distributions, the rules for marrying in or out of the family, and the role of external board members are all easier to set early than to renegotiate after a generation of practice. Bringing in external board members, including HNW financial advisors with experience across multiple family offices, can sharpen the structural decisions before they harden.
The last piece is planning for generations the founder will never meet. The Ilka case is instructive here. Her office was founded in 1866 and now serves the seventh generation, with G7 babies still being born. Decisions made in the 1800s about who counts as family, how shares are held, how distributions work, and how trustees are selected are still binding. The first-generation builder is making choices that will outlive them by a century. That is the part most explainers skip, and it is the part that matters most.
Frequently Asked Questions
What is a single family office?
A single family office is a private company that manages the wealth and affairs of one family, typically across investment management, tax planning, estate administration, and household services. Under the SEC Family Office Rule, it is excluded from investment adviser registration if it serves only family clients, is wholly owned and controlled by family members, and does not hold itself out to the public as an investment adviser.
What's the minimum net worth for a single family office?
There is no fixed minimum. Industry surveys from UBS and Deloitte show that the average family office serves families with net worth in the billions, but the more relevant question is whether the family's operating complexity and desire for centralized control justify the operating cost. Most households below $100 million find that a strong external team plus a multi-family office or wealth manager is the more efficient structure.
What does a single family office do that a wealth manager doesn't?
A single family office has no wallet-share motive, no commission economics, and no obligation to clients outside the family. That structural alignment allows for multi-generational time horizons, centralized control across family branches, and candid advice that is structurally impossible inside a fee-based advisor relationship.
How much does it cost to run a single family office?
The UBS Global Family Office Report 2024 places the average operating cost at approximately 39.8 basis points of assets under management, with most offices employing 10-15 staff. The all-in cost depends heavily on the scope of services, the size of the investment team, and the complexity of the family's tax and estate structure.
Single family office vs multi family office: which is right?
A single family office serves one family with full control and full operating cost. A multi-family office spreads cost across multiple unrelated families, trading customization for scale. Single family offices fit families that want full control and have the wealth and complexity to support a captive structure. Multi-family offices fit households that want sophisticated services without building a captive business.
When does it make sense to start a family office?
When the family wants centralized control across branches and asset types, when operating complexity has outgrown coordination across external providers, and when the family is genuinely willing to run a small business. It rarely makes sense as a status milestone or a default at any particular net worth level.
At $25 million net worth, should I start a family office?
Usually not. At that scale, a strong external team (tax advisor, wealth manager or multi-family office, estate attorney, CPA) plus a peer community for decision validation is typically the more efficient structure. The operating cost of even a small captive family office consumes more value than it creates at first-generation wealth levels below roughly $100 million.
Final Thoughts
The single family office is a real structure with a real purpose. It is also one of the most misunderstood concepts in high-net-worth wealth management, partly because every wealth manager has a reason to talk about it and partly because the people who run them rarely speak publicly. The honest picture is that a family office is an operating choice, not a wealth milestone. It is the right answer for families with the complexity and the willingness to run a small business across generations. It is the wrong answer for most first-generation households still optimizing around a primary wealth source.
The more interesting question, for most households evaluating this for the first time, is what the right structure looks like at their actual stage. That answer usually involves better external service providers, sharper governance, clearer decisions about generational planning, and a peer community that can sanity-check the decisions before they harden. The family office can come later, if it should come at all. The decisions that compound across generations are made earlier than that.
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