In short
Three structural moves cover most of what multi-generational living actually requires: a ground-floor suite, a lift, and a second living room that is genuinely separate. All three are decided at concept stage or not at all. The piece argues that the usual request — a larger house — answers the wrong constraint, because separation is the problem rather than floor area, and covers the inexpensive provisions that keep a house useful for twenty years: accessibility, service access and electrical capacity.
The three structural moves
A ground-floor bedroom with its own bathroom removes the stair from the daily routine of whoever needs it removed. A lift future-proofs the rest of the house. A second living room means two generations can be at home at the same time without negotiating the television.
All three are structural. They are decided at concept stage, while they cost a line on a drawing, or they are not decided at all.
What people ask for instead
Usually a larger house. Area is rarely the constraint — separation is. A well-planned 6,000 square foot house works better for three generations than a badly planned 9,000.
Separation is acoustic as well as spatial. Bedrooms placed away from the main living spaces, a second entrance or a separate stair, and walls and floors that stop sound travelling do more for a shared house than another room.
The lift, or the possibility of one
Retrofitting a lift into a house that made no allowance for one is a demolition project. Building the shaft is the expensive part; stacking cupboards vertically through the floors so that a shaft could be formed later costs almost nothing.
Do the second at the very minimum. In a three-storey house it decides how the upper floors are used over time.
Accessibility costs almost nothing now
- Level thresholds throughout, which also simplify waterproofing when they are detailed properly.
- Doors wide enough for a wheelchair.
- At least one bedroom and one full bathroom at ground level, or a plan that can create them.
- Blocking inside bathroom walls for grab rails that may be needed later.
- A stair that is comfortable, not merely compliant.
These matter for far more circumstances than age — a broken leg, a pram, a heavy delivery — and they are almost free when the house is being built.
Capacity and access for the next twenty years
- Generous service risers with removable panels, rather than services buried in the structure.
- Conduit with a pull-string to anywhere a cable might one day be wanted.
- An electrical supply sized for what the house may need in fifteen years: car charging, induction cooking, more cooling.
- Valves that let one bathroom be worked on without shutting off the whole house.
The principle is simple: the next person to touch these systems should not have to break anything to reach them.
Planning for a change of use
The ground-floor suite a grandparent uses now becomes a study, then a guest room, then a suite again. Rooms that can carry two or three uses over twenty years are worth more than rooms that are perfect for one.
Key takeaways
- Ground-floor suite, lift, separate second living room. In that order.
- The constraint is separation, not floor area.
- Build in what costs little now and a great deal later — level thresholds, wide doors, spare capacity.
- Design rooms to carry two or three uses across twenty years.
Questions people ask
In a three-storey house, installing it now is usually the better choice if the budget allows. If not, build the shaft and use it as storage, or at the very least stack cupboards vertically so a shaft can be formed later without demolition.
