What Should Parents Ask When Designing a Healthy Family Home?

If I were designing a home for my own children, I would start with their bedroom.

Not the size of it.

I would want to know what happens at 2 am when the door and windows are closed. Where is the fresh air coming from? Is the room still comfortable after four days of 38-degree heat? What happens in winter when the glass and external walls become cold?

Those questions tell me far more about the quality of the home than the size of the wardrobe or the specification of the ensuite.

Parents do not need to become building scientists to design a healthy home.

They do need to know which questions expose whether the person designing it understands the things that will affect their children every day.

What happens in the bedroom when everything is closed?

This is probably the first question I would ask.

A child’s bedroom may be occupied for eight, ten or twelve uninterrupted hours while much of the rest of the house is empty.

The door may be closed. The window may also be closed because it is cold, hot, noisy outside, full of pollen or affected by bushfire smoke.

Where does the fresh air come from then?

In many homes, the answer is some combination of open windows, exhaust systems and air leaking through gaps in the building. That makes both the amount of air and where it comes from difficult to control.

A deliberate ventilation strategy should have a clear answer.

I am sometimes surprised by how much attention can go into selecting the stone in a child’s ensuite while nobody can explain how fresh air reaches the bedroom once the door and windows are closed.

That feels back to front to me.

The research behind this article also points to the importance of ventilation and indoor pollutant levels in the environments children occupy.

How has the design dealt with condensation before mould appears?

Mould is easier to discuss because people can see it.

The better question is what is being done to prevent the conditions that allow it to develop.

Dampness and visible mould in homes are associated with asthma, wheezing and respiratory illness in children.

For a parent, I do not think the useful response is to learn the physics of every wall junction.

I would ask the designer where they think condensation risk is highest in this particular house.

Around the windows?

At a roof junction?

Where a balcony, structure or service penetrates the building envelope?

Then ask what they have done about it.

A generic answer about insulation would not satisfy me.

The difficult parts of a building are usually the junctions, not the large uninterrupted areas of wall where insulation is easy to install.

A new home deserves the same scrutiny as an old one. New construction can still contain weak thermal junctions, poorly resolved windows or inadequate moisture control.

If the designer has thought about it properly, they should be able to show you where the risks are and how they have been resolved.

What happens when the weather becomes difficult?

Display homes and design presentations usually show houses in benign conditions.

Real homes do not get that luxury.

I would want to know what happens after several very hot days, during a cold winter morning, or when smoke makes opening the windows undesirable.

This is particularly important in children’s rooms because they have much less control over their environment than adults do.

A child cannot decide that the west-facing glazing was a mistake. They cannot improve the insulation, alter the shading or change how the ventilation works.

They simply live with the decisions we made for them.

For summer, I would want to understand how the orientation, shading and glazing have been considered before anyone talks about the size of the air-conditioning system.

For winter, I would want to know whether the internal surfaces will remain warm enough to avoid cold radiant discomfort and reduce condensation risk.

If the only answer to difficult weather is larger mechanical equipment, I would question whether the architecture has done enough work first.

What will you actually test when the house is finished?

This is where claims about healthy or high-performance homes become much easier to assess.

Ask what will be measured.

At Borland Architecture, our high-performance homes target an airtightness level of 0.6 air changes per hour at 50 Pascals.

That is not a description such as ‘well sealed’.

It is a result we can test with a blower-door test once the building envelope is complete.

If the measured result is not good enough, we know there is a problem to find.

The same thinking should apply to ventilation. A system should not simply be installed and assumed to work. It should be commissioned so that we know the intended volume of fresh air is actually reaching the rooms where it is needed.

I think clients should become more demanding about this.

If a designer or builder tells you the house is healthy, comfortable or high-performing, ask what they intend to measure at the end.

Describing a house as airtight is not particularly useful without a measured result.

Ask what changed because children will live there

This is a question I would ask of the design itself.

What decision was made differently because this is a family home?

Perhaps the bedrooms were moved away from traffic noise.

Maybe a western window was reduced because the view did not justify the summer heat it would create.

Perhaps the ventilation strategy changed because a child suffers badly from pollen.

Or the ground floor was planned so a bedroom can serve a different purpose as the family changes.

If nothing in the design changed after understanding the family properly, I would wonder how bespoke the thinking really was.

This matters because healthy design is not a specification package added after the plan has been decided.

It sits inside decisions about where rooms go, how they face, what windows they need, how the building fabric is assembled and how fresh air reaches the people inside.

You do not need to know all the answers

This is important.

A parent should not have to know what an airtightness membrane looks like, calculate thermal bridges or understand ventilation flow rates.

That is why you employ experts.

What you should expect is that the expert can explain the consequences clearly enough for you to make the decisions that belong to you.

If I were assessing an architect, building designer or builder for my own family, I would ask four things:

What happens in the bedrooms when the windows remain closed overnight?

Where are the difficult condensation risks in this design, and how have you resolved them?

What have you done to prevent summer overheating before relying on mechanical cooling?

What will you test or commission when the house is finished?

Those questions are difficult to answer with marketing language.

They force the conversation towards the building itself.

Children change the way I think about the brief

They have less control over their environment than the adults designing it.

They cannot improve the insulation, replace the glazing, fix a thermal bridge or decide how fresh air reaches their bedroom.

They live with those decisions.

So when I look at the design of a family home, I want to know what happens in a child’s bedroom with the door shut and the windows closed on a hot February night.

That question tells me considerably more than the size of the room.