How to build a family office-style wealth plan (without £100m)

What is a family office?

A family office is a private advisory firm set up to manage the finances – and often the lives – of ultra-wealthy families. Think investments, tax, estate planning, philanthropy, and sometimes even hiring the nanny.

The concept dates back to the Rockefellers in the 1880s, who were among the first to create a full-service setup to manage their vast oil wealth. Today, the idea has gone global – and grown fast – as more families look for joined-up oversight.

There are two main types:

• Single-family offices (SFOs) serve just one family and are tailored but expensive – typically costing £1 million+ a year to run.
• Multi-family offices (MFOs) aren't technically family offices in the traditional sense. They borrow the model – joined-up advice across tax, investments, estate planning – but spread it across multiple clients. Think elite wealth management, just with a broader toolkit and a higher bill.

The goal is control and coordination. A family office brings all the moving parts (investments, tax, legal, legacy) under one roof. For those with serious wealth, it beats juggling a dozen different advisers with clashing agendas and no idea what the others are doing.

How to build your own "family office-lite" (DIY version)

So, you don't have £100 million.

You don't need it. Forget the overhead – what matters is how well your advisers work together.

A proper family office works because the right people talk to each other, stay ahead of problems, and treat your wealth like it's their full-time job. You can recreate that coordination and control with your own team – without putting anyone on payroll.

Here's how to build a lean, joined-up support network that works like a family office (minus the private chef).

Start with a lead adviser

It's like assembling flat-pack furniture – your solicitor, accountant, and broker all have their own Allen keys, but someone needs to read the instructions.

Usually, that person would be an independent financial adviser (IFA) or a private wealth manager who offers full financial planning, not just investment chat.

Pick someone qualified (look for Chartered or Certified Financial Planner status) who will:

• Understand your long-term goals.
• Coordinate with your tax adviser and solicitor.
• Flag problems before they get expensive.

The best ones act like a personal CFO. If yours only talks fund performance, it might be time to look around for an upgrade.

How do you know if a financial adviser is worth their fee? Find out here what questions you need to ask before you commit, and the answers you should expect.

Bring in a tax specialist

In a real family office, tax is always part of the conversation. You should have an accountant who does more than fill out your return – they should actively plan with you.

They'll help with:

• Capital gains strategy.
• Extracting money from a business.
• Inheritance tax mitigation.
• Navigating HMRC letters without panic.

Make sure they're comfortable working with high-net-worth clients. If your adviser and accountant aren't in touch with each other, you don't have a system – and it all turns into a game of financial Chinese whispers.

Have a solicitor on call

You don't need to speak to a solicitor every month. But, when legal issues come up, you want one who already understands your finances.

A good private client solicitor can help with:

• Wills and trusts.
• Power of attorney.
• Gifting assets.
• Setting up a family investment company.

If you're looking at trusts or estate planning, find someone STEP-qualified – they deal with this stuff every day. And make sure your solicitor talks to your tax adviser and wealth manager.

Use tools to stay organised

Even the slickest advisers can't help if your finances are scattered across a dozen platforms and folders marked 'miscellaneous'. You need a system.

Options:

• Ask your adviser for access to a consolidated dashboard.
• Use account aggregation apps to view everything in one place.
• Maintain a simple spreadsheet and a well-labelled cloud floder.

It doesn't need to be pretty, just functional. The goal is instant clarity when needed (or when HMRC comes knocking).

Keep the team talking

You can't coordinate a team that doesn't know it's a team. Once a year, get your IFA, accountant, and solicitor on the same Zoom call. It costs a bit in billable hours – but it could avoid costly misunderstandings, clashing advice, or duplicated effort.

You don't even need to be hands-on about it. If you prefer, let your lead adviser take charge. Just make sure someone is tying the threads together; otherwise, you'll be the one chasing down answers when things don't align, and wondering how the sum of all those billable hours bought you everything except an actual plan.

Multi-family office vs DIY coordination

A multi-family office (MFO) borrows the structure of a traditional family office but shares it across several clients. Instead of headhunting your team like a Premier League manager in the January transfer window, you're stepping into a squad that's already been picked, trained, and knows how to play together.

It's a tempting middle ground: more joined-up than juggling a solicitor, accountant, and wealth manager over WhatsApp – but not as full-fat (or full-cost) as running a private office of your own.

Let's have a gander at how the two compare:

Using a multi-family office (MFO)

Pros: Less hassle, more horsepower

• You get a pre-built team of experts: tax, investment, legal, estate. They're used to working together. You're not juggling calls every time you make a financial move.
• One firm holds the reins. The same outfit can update your will, structure the sale of your business, and rebalance your portfolio – often just by walking down the corridor.
• You get continuity. If your point of contact retires, the firm still knows your situation. No more 'explaining your life story' every few years.
• They may open doors. Some MFOs offer co-investments in private equity deals or access to institutional fund managers that solo advisers can't.

Cons: Expensive, exclusive, and potentially limiting

• Many MFOs don't look twice at clients below £10 million – and even if they do, they'll likely charge tens of thousands of pounds a year.
• You lose a bit of freedom. You're buying into one firm's way of working, which might feel like a straitjacket if you prefer choosing your own accountant or legal team.
• Some MFOs are tied to specific banks or products – so "independence" might not always mean what you think.
• You still need to stay engaged. Handing off the admin doesn't mean ignoring the strategy. If you don't understand your own plan, that's not delegation – that's drift.

DIY coordination (with independent advisers)

Pros: Flexible, personal, often cheaper

• You choose your own team: IFA, accountant, solicitor. If one doesn't click, you swap them. No need to switch the whole setup.
• You pay for what you use. No standing retainer. Just bills when you need work done.
• It can be genuinely independent. You can find fee-only advisers with no ties to products or providers.
• You stay in control. You're the boss – setting the direction, choosing the pace, calling the shots.

Cons: It's work

• You (or someone in the family) has to keep it all aligned. And unless your idea of fun is project-managing professionals, it could get tiresome.
• There's more room for gaps. If your accountant doesn't know your investment strategy, you might miss a tax trick.
• You might miss out. Solo advisers rarely offer access to niche investment deals or consolidated reporting tools.
• Security and privacy are spread out. You're sharing sensitive data across multiple firms instead of through a single secure vault.

MFO vs DIY compared at a glance

Feature	Multi-family office (MFO)	DIY (Family-office lite)
Typical user	£10m+ in assets	£500k+
Annual cost	£50k–£250k+ (can be % or retainer)	Flexible, pay-as-you-go (0.5%–1% typical all-in)
Setup	Pre-built team under one roof	You assemble your own team
Who leads?	MFO manager (“family CFO/COO”)	You or your lead adviser (e.g. IFA/wealth mgr)
Co-ordination	Seamless, in-house	Depends on your team's willingness to communicate
Investment access	Private deals, institutional funds	Usually public markets, some private access
Reporting	Consolidated statements and dashboards	Varies (you may need to create your own)
Control	Lower – you buy into their process	Higher – you pick advisers and strategy
Flexibility	Lower – tied to their approach and products	Higher – swap advisers as needed
Continuity	High – firm retains knowledge	Depends if lead adviser leaves or retires
Time involved	Minimal. Hands-off approach possible.	Moderate. You (or trusted person) co-ordinate
Minimum commitment	High (£10m+ typical, £25m+ for top MFOs)	Low. No hard minimum, but £500k+ practical
Best for	Time-poor, ultra-wealthy	The comfortably well-off who want value and control

What does a "family-office-lite" setup actually cost?

Once you've weighed up the pros and cons, it's hard to go any further without knowing what it'll set you back. So let's break it down – line by line, pound by pound.

Wealth manager or IFA: the portfolio handler

Most advisers charge a slice of your assets to manage your money and offer planning advice. On portfolios under £1m, expect around 1% a year.

That drops as your pot grows – maybe to 0.5% once you're past £5m. So £5k a year (1%) if you've got £500k invested, or closer to £25k if you're working with £5m.

These fees usually cover investment decisions, portfolio maintenance, and general financial advice. But watch the fine print. Sometimes it's just investment management – and anything extra, like estate planning, means just another invoice.

Product costs (fund fees, platform charges) can add another 0.2% to 0.5% per year, depending on what you're in.

Tax adviser: the number-wrangler

Tax planning can be pay-as-you-go or by retainer. A simple self-assessment return might only cost £150–£500, depending on the complexity.

But once you add rental income, capital gains, a trust or two, foreign property, etc., annual compliance and advice can rise to around £1,000–£5,000+.

One-off planning projects (say, sorting out non-dom status or restructuring a buy-to-let empire) can run into the thousands. But, compared to the cost of hiring a full-time in-house accountant, this still feels like a bargain.

Many families in the £5m–£10m range spend £5k–£10k a year here, all in.

Legal advice: the intermittent hit

Lawyers charge hourly or by the job. A basic will might be a few hundred pounds. A more complex one, or setting up a trust, could hit £2k–£3k. If you're building a family investment company, factor in legal and accountancy bills of a few grand to get it off the ground.

But unlike portfolio or tax advice, legal work tends to come in bursts. You might spend £3k one year getting your affairs in order, then go quiet for a while. Budget for a spike, not a steady drip.

Multi-family office: time-poor, cash-rich?

If building a family office from scratch sounds like a headache, outsourcing to a multi-family office (MFO) might seem like a cleaner solution. But it's not an off-the-shelf product.

Some firms offer what they call a "family CFO and COO" – a team that handles strategy, structuring, succession planning, tax coordination, investment reporting, and those thorny family admin issues that keep people up at night. You don't even need to invest assets with them to be a client.

Fees are usually agreed on a quarterly basis, pegged to time and scope. Extra projects (like moving country or restructuring a business) are priced separately. There's no simple sticker price, but if you're spending less than seven figures a year on professional services, this model probably overshoots your needs.

Some MFOs won't consider clients below £25m, while others offer slimmer support for those in the £10m range. If you're closer to £1m–£5m, you're probably better off building a bespoke setup with trusted advisers – you'll get more control, and likely better value.

Ballpark example: how it all adds up

Say you've got £3m to invest, plus a couple of properties.

You hire a wealth manager who charges 0.75% (£22.5k), pay your accountant £3k for year-round support, and average £1k on legal work. That's £26.5k total – or around 0.88% of your assets.

As your wealth grows, that percentage tends to fall.

At £10m, you might spend £50k–£60k all in, or 0.5%–0.6%. That's also the rough entry point where a multi-family office starts to make financial sense – if you value having everything handled under one roof.

Service	Typical cost	Notes
Wealth Manager/IFA	~1% of assets under £1m ~0.5% if over £5m +0.2%–0.5% in product/platform fees	Covers investment advice and portfolio management. Extras like estate planning may cost more.
Tax Adviser	£150–£500 for basic return £1,000–£5,000+ for complex annual support More for one-off planning	Costs rise with property, trusts, foreign income. One-off projects (e.g. non-dom status) can be thousands.
Legal Advice	A few hundred to £3,000+	Spiky cost. Wills and trusts vary. Big projects (like a family investment company) need a larger budget.
Multi-Family Office (MFO)	Varies – often six figures Entry point typically £10m–£25m+	Joined-up team and strategy. Better for very high-net-worth clients. Not cost-effective below £10m.
Example setup	£3m portfolio = ~£26.5k/year (~0.88% of assets)	Includes wealth manager (0.75%), tax support (£3k), legal work (£1k average)
At £10m	£50k–£60k/year (~0.5%–0.6%)	Lower percentage as assets grow – potential tipping point where MFOs start to make sense

Want to make sure your wealth actually stays in the family?

Check out our complete wealth protection strategies guide. Think offshore bonds, family companies, and the kind of trust planning that keeps both the taxman and your in-laws at bay.

Bottom line

You don't need a Rockefeller budget to get Rockefeller-style coordination. Whether you're working with £500k or £10m, the key is having a plan. A lean setup with the right advisers, talking to each other and tied into your goals, can deliver most of the benefits of a family office without the seven-figure overhead.

The trick is to keep the lines of communication open, the paperwork tidy, and someone – ideally not you – conducting the orchestra so your financial plan doesn't end up sounding like a kazoo solo at a flute recital.

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