When a family home needs to work for more than one generation.

Families are also thinking about how to help a child find a home of their own. With the cost of buying in San Francisco, that conversation can include helping with a down payment, buying together, or finding a place close enough to stay part of one another’s daily lives.

There's no single way to make room. It depends on the house, the people, and how long the arrangement might last. Three clients I've worked with recently have each found a different answer.

Building room into the house you have.

One client turned the garage level of their home into a suite: a comfortable place for visiting family now, and possibly a place for themselves later, when fewer stairs will matter more. It's a space that earns its keep today and keeps options open for later.

A guest room that works beautifully for a weekend can feel different over several months. Is there enough privacy? Is a bathroom close by? Would a separate entrance make everyday routines easier for everyone?

The same thinking applies if someone joins the household to help with daily life. Is there a private room, with a bathroom nearby? Can they come and go without disrupting everyone else? How will the kitchen and other shared spaces work? Working that out ahead of time makes the arrangement easier for everyone.

It helps to picture how the space will actually be used before anyone draws plans. A comfortable guest suite is one thing; a separate unit with its own kitchen is another. San Francisco allows accessory units under both state and local rules, but what's possible depends on the property and the work involved. A garage or lower level may or may not qualify, so check eligibility before planning around it. An early conversation with an architect or contractor can tell you whether you're looking at a modest update or a much bigger project.

Finding a home that fits this chapter.

Another couple didn't want to give up what they loved about their home: the garden and the character. But the stairs were getting harder. They found a house with fewer stairs, in a neighborhood where they can walk more, and kept the garden and charm that made their old place feel like theirs.

Moving doesn't have to mean starting over. Sometimes it means keeping what matters most and leaving behind what no longer works.

Buying together.

I'm working with a client right now whose hillside home, and all its stairs, no longer fits the way they want to live. Rather than simply moving somewhere smaller, they're exploring buying a larger property with their adult daughter, with room for both households under one roof.

There are a few ways families help the next generation into a home. Parents might give money toward a down payment, lend it, or buy a property together. Each choice comes with different expectations.

Who will own the property, and in what shares? Who pays for upkeep and repairs? What happens if someone wants to sell, move, or buy the other out? These conversations are much easier before an offer is on the table or money changes hands. I can help with the property questions; the family's legal and tax advisers can help with the rest.

Questions to talk through as a family.

• How will the space be used, and for how long?

• How much privacy does everyone need?

• Is there a bedroom and bathroom on the entry level, or could there be?

• Who will own what, and who pays for what?

• What happens if plans change, with a new job, a marriage, or a change in health?

• Is this a change to the house you have, or a reason to look for a different one?