Designing for a Progressive Condition
Why this matters
Some customers are planning for a body that will keep changing: balance that is getting worse, a hand that is weakening, a diagnosis that came with a conversation about the next few years. If you design only for today, you will be back in eighteen months tearing out the tile you set, at several times the cost of doing it right while the wall was open. If you design for the worst case you imagine, you will spend their money on a house they did not ask for and tell them something about their future they did not want to hear from a contractor. The craft is staging: deciding which changes go in now, which are prepared for now and finished later, and which wait, without presuming anything about the person's prognosis.
The one rule that sorts the scope
Anything that helps the person today goes in now. Anything for later goes in now only if the surface is already open and doing it now costs a small fraction of doing it later. Otherwise, prepare for it if preparation is cheap, and leave it until it is needed.
The rule is about construction sequence, not medicine. It does not need you to know how the person's condition will go, which is exactly why it works: you are pricing the cost of access to a wall, a floor or a circuit, which is something you do know.
Three tiers come out of it:
- Install now. Changes that help today, or that cost little extra because the work is happening anyway. Blocking in every bathroom wall while the studs are bare is the classic: a few hours of lumber and screws now, against a day or more of tile demolition, matching and resetting later.
- Prepare now, finish later. Rough-in that makes a later change small: an empty conduit and a junction box at the top of a stair, a 36-inch door frame with a 32-inch door in it, a shower floor framed for a curbless pan even if a low curb goes on for now, a supply and drain stubbed where a wall-hung lavatory would go.
- Wait. Changes that are expensive, invasive or genuinely uncertain in shape: a lift, a widened bearing wall that is not otherwise being opened, a kitchen that would be reworked for a seated user. These go in a written plan, not in this job.
Scoping without presuming
The person decides how much of their future they discuss with you. Your questions are about function and plans, not about the diagnosis.
Ask what is getting harder and what they want the house to handle. "What is harder than it was a year ago?" and "Is there anything you want this room ready for down the line?" let the person say as much or as little as they choose. Many will tell you what their doctor or therapist has said. Some will not, and you do not need it.
Do not narrate their decline. "When you're in a wheelchair" is a prediction. "If you ever use a wheelchair in here, this door would need to be wider, and it is cheap to frame it now" is a construction fact they can accept or decline.
Record function, not diagnosis. The work order says "uses a cane, balance worse when tired, wants the bath ready for a seated shower and a possible wheelchair later". A diagnosis on a work order travels to every tech, sub and office person who opens it, and the customer did not hire you to share it. If they want it recorded, record it where they say.
Bring the occupational therapist in where there is one. An OT can tell you which functions are likely to change and in what order, framed as function, which is the input staging needs. See related: Working With the Occupational Therapist.
Leave room for the person to change their mind. A plan in three tiers lets them stop after the first, accelerate the second, or drop the third, and none of those choices wastes the work already done.
Cheap now, expensive later
These are the preparations with the best ratio of now-cost to later-cost. The later column is what the same result costs if nobody did the preparation.
| Preparation while open | Now | Later, without it |
|---|---|---|
| Blocking on every bath wall | A few hours in an open wall | Opening finished tile or plaster, a day or more per wall, plus matching |
| 36-inch rough opening, smaller door hung | Framing a wider header in a wall already being reframed | Widening a finished opening, possibly a bearing wall with temporary support |
| Shower framed for a curbless pan | Recess or slope framed during the subfloor work, with the structural check done then | Removing the shower, the floor and possibly joists |
| Empty conduit and box at the stair top | An hour or two with walls open or an attic run available | Fishing a new circuit through finished walls |
| Lavatory supply and drain at wall-hung height | Rough-in placed during plumbing | Opening the wall behind a finished vanity |
| Wider hallway clearance kept clear of new built-ins | No cost, a decision not to build | Removing cabinetry |
Two of these need more than a carpenter's judgment. A curbless recess cut into joists is a structural change that needs the joists evaluated, and often an engineer, before anyone cuts. See related: Curbless Showers and Where the Water Goes. A widened header in a bearing wall needs a sized header and temporary support during the work. See related: How to Widen a Doorway in a Bearing Wall Safely.
The conduit for a future lift is a raceway with a box, not a powered circuit. Whoever installs the lift will run the circuit and decide its rating against the lift's instructions; your job is to make that run short. See related: Stairlifts, Platform Lifts and Who May Install Them.
Worked example: a bathroom remodel with a future in it
The customer is 54. At the first visit she says her balance is getting worse, she uses a cane outside, and her neurologist has told her she may use a wheelchair at some point. She wants the hall bath redone because the tub is getting hard to step over. She does not want to talk about timelines. The tech records: "cane outdoors, balance worse when tired, stepping over the tub is the current problem, wants the room ready for a seated shower and possibly a wheelchair."
The job as asked: tub out, shower in, new vanity and toilet, new tile. The walls and floor will be open.
Tier 1, install now. Each one passes the rule because the surface is open anyway or because it helps today.
- Shower with no curb to step over and a fold-down seat on blocked wall, because stepping over the tub wall is the problem she has now.
- Blocking on all four walls, floor to 72 inches, so a bar can go anywhere later. About 4 hours now. A bar added later on an unblocked tiled wall means opening tile or using listed anchors, a day or more for the first approach.
- One horizontal grab bar in the shower and one by the toilet, placed with her standing where she uses them. See related: Grab-Bar Backing and Load: The Structural Rule.
- A lever faucet and a handheld shower on a slide bar she can reach seated.
Tier 2, prepare now.
- The bathroom door wall is being reframed for a new pocket door anyway. The shop frames it for a 36-inch door with a header sized for that span, and hangs a 36-inch pocket door now since the cost difference over a 30-inch one is small. That decision moved from tier 2 to tier 1 when the price came back close.
- The existing vanity location gets a supply and drain stub at wall-hung height, capped, behind the new vanity. When she wants knee space, the vanity comes out and a wall-hung lavatory goes on without opening the wall.
- The shower is built curbless now, which is tier 1, but the floor framing is also built so the shower area can extend 12 more inches into the room later for a wheelchair-sized roll-in footprint. That part needs the structural check now, not later, and the engineer's note goes in the file.
Tier 3, written down and not done.
- A stairlift to the bedrooms upstairs, if she wants one. The shop notes there is attic access over the stair top, so a raceway for the circuit can be run later without opening walls, and tells her the lift itself is an installer with the right license where her state requires one.
- A first-floor bedroom conversion of the den, with the bath next to it. Nothing done; a sketch in the file.
What the staging cost and saved. The additions in tiers 1 and 2, beyond the shower she asked for, added roughly 2 days to a 9-day job, about 22 percent more time on site. The later alternative for just the blocking and the wider door, done in a finished room, would be roughly 3 days of work on its own, plus the tile matching problem that usually means retiling a whole wall. The ratio is the argument: 2 days now against 3 or more later for only part of what the 2 days bought.
What she decided. She took tiers 1 and 2, asked that tier 3 stay on paper, and told the tech she would rather not discuss the stairlift again until she raised it. The file says so.
How this goes wrong
Designing to a prognosis the person did not give you. A tech who hears a diagnosis and builds a full roll-in bathroom, lowered vanity and widened hall, for a person who walks with a cane today, has spent their money on his guess. The tier list exists to make that a choice the customer makes.
Preparing what nobody records. A capped stub behind a vanity and blocking inside a finished wall are invisible. If the photos and the measurements are not in the file, the next contractor cannot find them, and the preparation is wasted. Photograph every open wall with a tape in the frame before it closes.
Treating tier 3 as a sales funnel. A written plan is a service to the person. Calling every six months to ask whether they are ready for the lift is not.
References
- 2010 ADA Standards for Accessible Design, used across the sibling cards as a dimensional reference; not binding in a private home.
- See related: Working With the Occupational Therapist; Universal Design in Plain Terms; Funding Paths for Home Modifications.
- See related: How to Sequence a Whole-Home Modification; Grab-Bar Backing and Load: The Structural Rule.
- See related: Stairlifts, Platform Lifts and Who May Install Them.