How to Kick Your Grown-up Child Out of the Home

In 2023, more than a third of all New Zealand families with children had at least one adult child still living at home. The figure has risen 27 per cent since 2013, and the number of households with adult children has grown by more than 100,000 since 2004. It is now the fastest-growing household type in the country.

Most people, when they think about threats to their financial future, picture dramatic events: another GFC, a bank failure, a geopolitical crisis. In practice, the risks most likely to reshape your retirement are quieter. An adult child who moved home "for a few months" and is still there three years later. A decade of small, unquestioned subsidies compounding into a six-figure opportunity cost. The dramatic risks make the news. The mundane ones compound in your household budget.

For some families, the issue is financial. For others, it is personal: they want their home, their routine, and their independence back. Both are legitimate reasons to act, and both deserve a plan rather than an argument.

If the arrangement is still in its early stages, our guide to making it work when adult children move home covers the boundaries and expectations worth setting from day one. This article is for parents who have moved past that point, where the cost has become too high to ignore.

Below, we cover the real financial cost of hosting an adult child, how to set a timeline and financial plan, when to involve professional help, and where the legal boundaries sit.

The Financial Cost Most Parents Don't Add Up

Hosting an adult child is not free, even when they are contributing to the household. Otago University's annual food cost survey estimates a moderate weekly food budget of around $115 for a man and $98 for a woman at the national level. Over a year, food alone can add $5,000 to $6,000 to your household spending.

Then add power, water, broadband, insurance adjustments, wear and tear on the property, and the less visible costs: the social limitation of not being able to downsize, travel, or restructure your living arrangements as you approach retirement.

For parents in their fifties and sixties, every year of subsidising an adult child is a year of reduced saving, reduced investment growth, and reduced flexibility. Compound returns over a 10-to-15-year horizon are significant, and they are lost permanently.

And there is a longer tail many parents do not model at all. Residential care in Auckland and Wellington can run from $73,000 to over $110,000 per year. The government's subsidy is heavily means-tested, and for single or widowed people the family home's value typically counts toward the asset threshold. A parent who spent their fifties and sixties absorbing the cost of an adult child at home, then enters care at 80, may find very little is left.

The assumption a home will pass to the next generation collides with the reality of selling it to fund care. As Joseph Darby wrote for interest.co.nz, 70 per cent of wealthy families lose their wealth by the second generation and 90 per cent by the third. The pool of wealth available for transfer is already smaller than most people assume.

We see this pattern regularly in our advisory work. Parents approaching retirement who are reluctant to have an honest conversation about money with their adult children, and who end up arriving at 65 with less flexibility than they should have.

Why It Happens (And Why It Persists)

New Zealand's housing market is a genuine barrier. Median house prices remain several multiples of median household income, rents in Auckland and Wellington absorb a punishing share of a young person's pay, and the deposit hurdle for a first home is steeper than anything the parent generation faced. These are real constraints, and acknowledging them is important.

It is also worth recognising the other side: for the adult child, moving out often means a sharp jump in living costs, the pressure of flatting with strangers, and less capacity to save. None of this is a reason to avoid the conversation, but it does explain why many families find it easier to let things drift.

In our experience, the arrangements most likely to become entrenched share a few common features: no agreed timeframe, no financial contribution (or a token one), vague goals, and a reluctance on both sides to have a direct conversation about expectations. The longer the arrangement runs without boundaries, the harder it becomes to change. For a deeper look at why this trend is accelerating and the psychology behind it, our companion article on the retirement cost of supporting adult children covers the research in detail.

The psychological dimension matters too. Parents feel guilty. Adult children feel embarrassed or defensive. And the longer the status quo holds, the more normal it feels, even when it is quietly damaging the financial position of both parties.

Short-Term Support or Long-Term Drag?

Before working through the practical steps below, it is worth being honest about which situation you are in. If your child has a clear plan, is saving toward a specific goal, and the arrangement has a defined end point, you are providing launch support. If there is no plan, no timeline, and no meaningful financial contribution, you are absorbing an open-ended cost. The steps below apply to both, but the urgency is different. Launch support needs structure. Long-term drag needs a deadline.

Getting Your Adult Child to Move Out: Practical Steps

1. Set a Timeframe and Put It in Writing

Open-ended arrangements drift. A written agreement with a move-out date, even a generous one, changes the dynamic entirely. Six months is common. Twelve months is reasonable if your child is saving for a deposit or completing a qualification. The point is the existence of an end point everybody has agreed to.

The agreement should also cover financial contributions. Board or rent, a share of utilities, and household responsibilities are all reasonable. If your child is earning, they should be paying. If they are not earning, the agreement should include specific steps they will take to change their position.

2. Require a Financial Plan

This is where most generic advice falls short. Telling your child to "get a budget" is not enough. What works is requiring them to produce an actual plan: how much they need to save, by when, and what the weekly surplus looks like after their contribution to the household. If they cannot produce this on their own, it is a strong signal they need help with basic financial planning, and getting help early is one of the best things you can do for them.

For children saving toward a first home, the numbers can be clarifying. A clear savings target, a realistic timeline, and an understanding of what deposit assistance (if any) the parents are willing to provide will do more than vague encouragement. Our first home buyers page covers the mechanics in more detail.

3. Charge Board and Save Part of It

One approach we have seen work well: parents charge board at a meaningful rate, save a portion of it quietly, and return the saved amount when the child moves out as a contribution toward bond, furniture, or a rental deposit. The child learns to budget around a genuine expense, and they receive a practical boost at the point it matters most.

The behavioural difference between paying $200 a week and paying nothing is enormous. Free accommodation removes the financial friction needed to build the habits of independent living.

4. Protect Your Own Retirement

This is non-negotiable, and it is the area where parental generosity most often backfires. Retirement Commission research shows 40 per cent of over-65s rely entirely on NZ Super, with a further 20 per cent having only a small supplement.

If you are within 10 to 15 years of retirement, every dollar redirected to supporting an adult child is a dollar not growing in your investment portfolio or your KiwiSaver Scheme. Supporting an adult child is a retirement decision, whether you treat it as one or not.

One detail many parents overlook: if you have been receiving NZ Super as a single person living alone and your adult child moves back in, your payment rate can be reduced. The difference between the "living alone" and "living with others" rates is not trivial, and it catches people off guard.

Our guide to how much it costs to retire in New Zealand breaks down the 2025 Massey University data in detail, but the headline: a two-person household in Auckland, Wellington, or Christchurch needs roughly $910 per week for a basic retirement. NZ Super pays around $854 per week after tax for a couple. The gap must come from somewhere, and the earlier you start closing it, the smaller the sacrifice required.

If you want to understand the mechanics of converting your savings into retirement income, our retirement drawdown guide covers the main methods, including the risks most retirees underestimate.

If you want to understand what this arrangement is costing your retirement, a conversation with an adviser can put a number on it.

5. Use Your Network (Not Just Your Wallet)

Financial support is the obvious lever, but it is rarely the most effective one. Introductions to people in your child's chosen field, help with job applications, assistance finding a flat, and simply modelling what financial independence looks like are all more valuable over time than cash transfers.

If your child is resistant to advice from you, an uncle, family friend, or mentor can sometimes say the same thing with more impact. This is human nature. Young adults often hear external voices differently from parental ones.

6. Be Direct, Not Cruel

The framing matters. "You need to leave" lands differently from "We need to talk about the plan for you to get established on your own." The goal is not to damage the relationship. The goal is to shift the arrangement from one of indefinite dependency to one of supported transition, with a clear end date and mutual accountability.

Asking an adult child to move out is one of the harder conversations a parent can have. If there are complicating factors like mental health, addiction, or a disability, it may be worth engaging a family mediator or counsellor before setting hard deadlines. The Family Services Directory can help locate services in your area.

When the Situation Is More Serious

A small number of cases go beyond inconvenience. If an adult child is financially exploiting a parent, refusing to leave despite clear requests, or behaving abusively, the situation is no longer a parenting challenge. It is a legal one.

The line is not always obvious. A parent giving reasonable written notice and a move-out date is well within their rights. An adult child who ignores repeated requests, refuses to contribute while earning an income, or uses intimidation to maintain the arrangement has crossed into territory where legal advice is warranted.

In New Zealand, parents are the legal occupiers of their own home and have the right to ask any adult to leave. If the adult child refuses, the next step is typically a formal written notice followed, if necessary, by legal advice. Community Law Centres offer free initial consultations and can advise on the specific steps available in your situation.

Financial abuse by adult children against ageing parents is a recognised form of elder abuse in New Zealand. If you suspect this is happening to you or someone you know, the Office for Seniors provides guidance and referral pathways.

How to Kick Your Grown-up Child Out of the Home

Asking an adult child to leave is, in many cases, it is the single most constructive thing a parent can do: for their own financial security, for the relationship, and for the child's long-term development. Independence is built by doing hard things, and managing your own finances, rent, and responsibilities is one of the hardest and most rewarding transitions a young adult can make.

It is also worth remembering the evidence on what happens to wealth left to the next generation. Research consistently shows most inherited wealth does not survive intact. The skills, habits, and self-reliance your child builds by standing on their own are a more durable inheritance than any dollar figure. For a deeper exploration of what makes a lasting legacy beyond money, we have written about this separately.

The parents we work with who handle this well tend to share a few traits. They are honest about their own financial position. They set expectations early and clearly. They offer practical support without open-ended subsidy. And they treat their adult children as adults.

If you would like to understand how supporting adult children fits into your broader financial picture, or you want to make sure your retirement plan can absorb the cost, get in touch. We help New Zealand families navigate exactly these kinds of decisions.

One question worth sitting down with this week: if the current arrangement continues for another three years, what does your retirement look like?