Multigenerational Home Design: How to Plan a House That Works for Every Generation

More families in Surrey, Langley, and across the Lower Mainland are choosing to live together. Grandparents helping with the kids. Adult children saving for their first home. Parents who want to age close to family instead of in a care facility.

Living together can be wonderful. It can also be hard if the house was never designed for it.

A multigenerational home is not just a big house with more bedrooms. It is a home designed so that several generations can share daily life and still have privacy, independence, and their own space. At Arcadia Design, multigenerational homes are among the most common projects we design. Here is what we have learned about getting them right.

What Is a Multigenerational Home?

A multigenerational home is designed for two or more adult generations living on the same property. That might be parents and grandparents, parents and adult children, or three or four generations together.

The design can take very different forms. Some families want one shared household with a private wing for grandparents. Others want fully separate living spaces with their own kitchens and entrances. Some want separate buildings on the same lot.

There is no single right answer. The right design depends on how your family actually lives, and how much togetherness and separation each generation wants.

Start With These Questions

Before we draw anything, we ask every multigenerational family the same set of questions. The answers shape the whole design:

• Who will live in the home now, and who might in five or ten years?
• Will everyone cook and eat together, or does each household want its own kitchen?
• Does anyone have mobility needs now, or likely in the future?
• How much privacy does each generation want during the day and at night?
• Who needs a separate entrance?
• Do you want the option to rent part of the home in the future?
• How many vehicles will the household have?

Three Ways to Design for Multiple Generations

Most multigenerational homes fall into one of three approaches. Which one is possible depends on your property, zoning, and budget.

1. One shared home with private zones. The family shares the main kitchen and living areas, and each generation has its own bedroom suite and quiet space. This works well for close families who want to cook and eat together.

2. A main home with a secondary suite. A self-contained suite with its own kitchen, bathroom, and entrance, inside the main house. In Surrey, a single family dwelling can generally include one secondary suite, subject to zoning and the BC Building Code.

3. Separate residences on the same property. A garden suite, coach house, duplex, or houseplex can give each household its own front door while staying steps apart. On larger lots and agricultural land, an additional residence may be possible, subject to provincial and local rules.

12 Multigenerational Home Design Ideas That Work

Whichever approach you choose, these are the design moves that make the biggest difference to daily life.

1. A Main-Floor Bedroom Suite

This is the single most requested feature in multigenerational homes, and for good reason. A bedroom with its own full bathroom on the main floor means grandparents never have to use the stairs. It also works for guests, for recovery after surgery, and for anyone's later years.

Place it away from the busiest part of the house so it stays quiet, ideally with its own access to the garden.

2. Two Primary Suites

When two adult couples share a home, nobody wants to feel like the guest. Two primary suites of similar size and quality, each with a walk-in closet and ensuite, keep things fair and comfortable. Putting them on different floors or at opposite ends of the house adds privacy.

3. Separate Entrances

A separate entrance gives each generation independence. Grandparents can come and go without walking through the main living room. Adult children can arrive home late without waking anyone.

Even in a fully shared home, a second entry through a mudroom or side door can make a big difference.

4. A Spice Kitchen or Second Kitchen

Many families in Surrey and the Fraser Valley cook daily with strong aromas, deep frying, or large quantities. A spice kitchen, sometimes called a wok kitchen or working kitchen, keeps that cooking out of the main kitchen and living spaces.

For households that want separate meals, a full second kitchen in a suite may be the better option. Rules on second kitchens and second stoves vary by municipality, so this is something we confirm early.

5. Sound Separation

Noise is one of the most common complaints in shared homes. Insulated walls and floors between living areas, solid-core doors, and keeping bedrooms away from the kitchen, media room, and garage all help.

Where a legal suite is involved, the BC Building Code sets requirements for separation between units. Beyond the minimum, we look at how the layout itself can keep noisy and quiet spaces apart.

6. Design for Aging in Place

A home designed for three generations should still work when the oldest generation's needs change. Many of these features cost little when they are planned from the start, and a lot to add later:

• A step-free entry from the driveway or garage
• Wider doorways and hallways
• A curbless shower in the main-floor bathroom
• Wall blocking for future grab bars
• Stacked closets that could later become an elevator shaft
• Lever handles and good lighting on stairs

7. A Shared Heart

Privacy matters, but so does togetherness. Most families we work with want one generous space where everyone gathers: a large kitchen island, a dining table that seats the whole family, and a living area that opens to the backyard.

The best multigenerational homes balance a strong shared heart with clear private zones around it.

8. Private Living Spaces

Every generation needs somewhere to retreat. That could be a sitting area in the grandparents' suite, a family room upstairs for the kids, or a basement lounge for adult children. When everyone has a place to go, shared spaces feel like a choice, not an obligation.

9. Flexible Rooms

Families change. A nursery becomes a bedroom. A home office becomes a caregiver's room. A suite used by grandparents today could be used by an adult child later, or rented out.

Designing rooms that can change use, with the right bathroom access, closets, and door locations, keeps the home useful for decades.

10. Laundry, Storage and Mudrooms

More people means more laundry, more shoes, and more stuff. Consider a second laundry area in a suite or near the bedrooms, a large mudroom at the main family entry, and storage for each household so shared spaces stay uncluttered.

11. Parking and Driveway Planning

Three generations often means three or four vehicles. Planning the garage, driveway, and any additional parking early avoids cars being shuffled every morning. If there is a suite, the city may also have parking requirements.

12. Outdoor Spaces for Everyone

A covered patio where grandparents can sit outside year round, a safe lawn for kids, and a garden for those who love to grow food. On larger properties, separate outdoor areas for each household add privacy while keeping the family connected.

Common Mistakes to Avoid

We often see the same problems in homes that were not designed for the way the family lives:

• Putting the grandparents’ bedroom upstairs or in a basement with steep stairs
• Bedrooms placed next to the kitchen or garage
• A suite added late in the design, with poor light and an awkward entry
• No plan for future accessibility
• Designing only for today, with no flexibility for how the family will change
• Not checking zoning first, then discovering a suite or second residence is not allowed

Check What Your Property Allows

What you can build depends on your lot. Zoning decides whether a secondary suite, garden suite, coach house, duplex, or additional residence is possible, and local rules can affect second kitchens, parking, and floor area.

Any suite also needs the proper building permits and must meet the BC Building Code. We review all of this before design starts, so the plan you fall in love with is one you can actually build.

Planning a Multigenerational Home in Surrey or the Lower Mainland?

Arcadia Design is a building design firm in Langley that designs multigenerational homes across Surrey, Langley, Abbotsford, Delta, and the rest of the Lower Mainland. Tell us who will be living in the home, and we will help you find a layout that gives every generation the space, privacy, and connection they need.