By Christopher B. Smith — Red Seal Carpenter and BCIN-licensed designer, Woodsmith Construction. East Toronto.
Of everything homeowners ask us, this is the question that comes up most.
Not always in those words. It arrives sideways — we’d like to stay here, or what would it take so we never have to do this again? People have decided about the house. They don’t yet know what the house has decided about them.
And in this part of the city the house is a 1910s semi, a 1920s East York bungalow, or a 1940s wartime house east of Woodbine. None were designed for this. They were built for young families with good knees, when the bathroom was one small room upstairs and the front door sat five steps above the sidewalk because the basement needed the light.
So here is the argument of this post, and what we say at the kitchen table before anyone draws anything: the building decides what is easy, what is hard, and what is a design job. Not the budget. The joists, the partitions, and the grade at the front of the lot.
Most of what you will read on this subject assumes a plywood subfloor, engineered joists and a front door at grade. That house is real — built after 1995, in a subdivision. It is not the house you are sitting in.
One boundary first. This post is about the house you already live in, modified for your own later decades. A place for a parent or an adult child — a suite, a second kitchen, the one-flight-versus-two question, room for an elevator shaft — is a different project with a different rulebook, and it lives in Bringing a Parent Home.
The bathroom is the room that decides it
If you only get one room, it is this one. Not the kitchen — a kitchen is easier to adapt, since counters and appliances move. The bathroom has the hardest surfaces, the wettest floor and the least space to make an awkward transfer in, and in a 1920s house it is often the size of a large closet wedged over the stair.
And almost everything you might do to that room runs into one question: what is under the floor?
What a curbless shower actually runs into on a plank floor
The idea is simple — no lip, nothing to catch a foot or stop a walker. The physics are simple too, and that is the problem: water still runs downhill, so either the shower floor goes down relative to the room or the room comes up to meet it. There is no third option, and the house decides which one you get.
In anything built in the last thirty years this is solved: plywood subfloor, engineered joists, and a table telling you where an opening may go. In a 1912 semi you have 2×8 dimensional lumber, spaced to whatever the carpenter thought right that morning, under a plank subfloor nailed diagonally across it — no engineered opening, no table, very little depth, and a subfloor that is part of what holds the floor square.
Three honest routes, and they are not interchangeable.
One: flush-set the subfloor between the joists. Lift the planks inside the shower footprint and set new sheathing on ledgers fixed between the joists, so the pan sits lower than the surrounding floor. The joists themselves stay intact. Least invasive and cheapest, and it buys a fixed, limited depth — often just enough for a low-profile pan and a linear drain.
Two: sister and drop one bay. Add members alongside the existing joists and frame a dropped section within a single bay, so the pan and its trap sit below the line of the floor. A structural alteration, and the route that needs an engineer to size the members and seal the drawing. Most room, most cost.
Three: raise the rest of the room. A low-profile or linear-drain pan on the existing floor, with the rest of the bathroom built up to meet it. The threshold does not disappear; it moves, from the shower entry to the bathroom door. Sometimes a good trade, sometimes it defeats the point entirely.
What decides between them is the first thing we ask on site: which way do the joists run relative to where you want to walk in? Parallel to the entry, and you are inside one or two bays with every route in play. Running across it, and both the drop and the drain have to cross several joists — a much larger conversation, and quite often the answer becomes route three.
One thing we will not do is take material out of the floor structure to make a pan fit. The Code limits how much of a joist you can notch or drill, and where, and a curbless pan usually needs more than that allows. The floor is not a suggestion.
Three smaller things belong in the same room, all cheap while it is open. Blocking for grab bars, flat stock everywhere a bar might ever go — the argument for that is in The Order You Do Things In. A thermostatic mixing valve, because a shower that cannot scald is the most useful thing in that wall. And non-slip flooring, chosen for a wet floor somebody will stand on at seventy-eight.
The main-floor bath, as a construction problem
The argument for a main-floor bath is settled, and we made it in the multigenerational post. This is the part nobody writes — where it physically goes.
An East-Toronto semi is roughly sixteen to eighteen feet wide and a good part of that is stair. There are usually three candidates. Under the stair is the obvious one and the one that most often fails; the constraint is headroom, and you check it at the fixture, not in the doorway. The back pantry, mudroom or rear porch is usually the best answer, for one reason: it is closest to the stack. A bite out of the dining room is sometimes correct, but it costs you dining room permanently — a decision for the drawing, not the site.
Which wins is mostly a drainage question. Waste from every fixture has to fall toward the cast-iron stack — generally at the back of these houses, near the kitchen — at a consistent slope, inside a floor made of 2×8 joists. That is not much floor to hide a drain in, and it decides more main-floor layouts than anything else. Where the geometry will not work, a pumped or macerating fixture is a legitimate answer with its own trade-offs: a design decision, not a rescue.
And a wet room asks the whole room to behave like the inside of a shower. A continuous waterproof membrane needs a stiff, flat, continuous substrate, and a century-old plank floor with cupping and shrinkage gaps is none of the three. The planks come out and are replaced with sheathing before anything waterproof goes down — demolition and framing, not tiling, and it belongs in the plan on day one.
Doors and halls: twenty-eight inches was the standard
Original interior doors in these houses are commonly twenty-eight to thirty inches, hung in lath-and-plaster partitions. A walker wants more; a wheelchair wants considerably more. The target is a thirty-four to thirty-six inch clear opening — clear meaning what is left once the door and stop are in the way, not what the rough opening measures.
There is a cheap first move: swing-clear hinges, which carry the door fully out of the opening and recover roughly the thickness of the door leaf. On a door that is close, that can be the whole answer.
When it isn’t, the job splits cleanly in two. In a non-bearing partition, widening a door is straightforward work — open the wall, reframe, patch, trim, done. In a load-bearing wall it is a different job: a header sized for what is above it, temporary support carrying the floor while the wall is open, and a drawing. A permit-and-engineering conversation, not a carpentry one — which is why we want to know which walls carry load before anyone prices anything.
One thing is true either way, and nobody warns homeowners about it: the plaster comes off both sides. Lath and plaster does not patch neatly at a new edge; it lets go in sheets, well past where you cut. Budget the wall, not the door — though an open wall is one you can put blocking and wiring into.
And look at the approach, not just the opening: a thirty-four inch door at the end of a thirty-six inch hall does not give a wheelchair room to turn into it. In a narrow semi the hall is usually the harder half.
The front door is five steps up
Our houses sit four to six steps above grade, almost without exception, because there is a basement under them and it needed windows. That elevation is the reason the house is dry.
Now the arithmetic that gets skipped. A ramp at 1:12 needs twelve feet of run for every foot of rise. A four-foot rise is about forty-eight feet of ramp, before the level landings a ramp also needs. There is no front yard in Riverdale, Leslieville, the Beaches or East York with forty-eight feet in it.
So a step-free entry is almost never a front-entry question here. It becomes one of four others. The side door is often the lowest on the house already — check that its landing gives you somewhere to stand. The rear door is frequently helped by back-yard grade sitting higher than the front, which can turn a five-step problem into a one-step problem for the cost of a landing. Regrading is genuine on some lots: bring the ground up to the door instead of the person. It is a drainage decision before it is an access decision, and on a lot that sheds water toward the house it is the wrong one. A platform lift is sometimes right where none of the above exists; in Ontario a residential lift is a regulated device with its own approvals, and that is as much as we will say here.
And sometimes the honest answer is not at the front. A family can live very well with a beautiful original front entry that guests use and a level, sheltered side entry they use every day. That is not a compromise — it is what the building will let you do.
Light, power and a warm room in February
Three smaller systems that matter more than their line items suggest.
The panel. Everything on this list adds circuits — better lighting, a heated floor, a lift, a bathroom fan that actually runs. The service that was adequate in 1958 often is not, and in a house that still has old wiring behind the plaster the question of what this drags into scope is a real one. Answer it in design, not in the second week of construction.
Night lighting. The route from the bed to the bathroom at two in the morning is the most-travelled path in the house and the worst lit. Low-level lighting along it, switched at both ends or on motion, is cheap while walls are open and nearly impossible to retrofit neatly. Add lever handles and rocker switches while you’re there; they cost the same.
A bathroom that is warm in February. A cold bathroom is one people rush in, and rushing is what you are designing out. We made the broader case about the rooms you stopped using, which also carries what the evidence says about stairs and falls. Heat the room, and heat it while the floor is open.
Plan for it, even if you don't build it
If you are renovating an older house you intend to keep — a kitchen, a bathroom, a rear addition, anything that opens walls — plan for this now. Not build it. Plan for it. On a job you are already doing, that means:
- Blocking everywhere a grab bar or rail might ever go, drawn on the plan and photographed before the drywall. The order matters.
- Thirty-four to thirty-six inch clear openings anywhere you are already reframing a door. Almost free while the wall is apart.
- The main-floor bathroom drain. Even if the bathroom is years away, run the waste while the floor is open. The highest-value rough-in on the list.
- A straight, stacked run through the house for a possible future lift.
- The option of a ground-level entry. Don’t let a deck, a patio or a regrade quietly close the one door that could have been level.
Woodsmith Insight
Almost nothing on the aging-in-place list is expensive while the wall is already open. Almost all of it is expensive once the wall is closed. The cost of planning for it is a conversation. The cost of not planning for it is the same renovation, twice.
The money, and the part that changed on the first of January
Now the credits, because this is where a lot of what is online is out of date — including, until this week, our own page. We are not publishing a cost range for the work itself; that depends on which of the routes above your house allows. Where we do publish ranges, they are in one place.
The Home Accessibility Tax Credit, derived
The Home Accessibility Tax Credit is worth the lowest federal tax rate applied to up to $20,000 of eligible work in a year. That is the rule; the number falls out of it. For 2025 the lowest federal rate is 14.5%, so $20,000 × 14.5% = $2,900 — the most the credit can be worth. For 2026 the rate is 14%, so $20,000 × 14% = $2,800.
The $20,000 limit is CRA’s, on its page for line 31285 — but that page prints no percentage, and it is still the tax-year-2025 page, so the dollar figure is a derivation. The rate comes from Bill C-4, Royal Assent 12 March 2026, which cut the lowest federal rate to 14.5% for 2025 and 14% for 2026 — quietly shrinking every credit calculated at it. CRA has already applied the same rate to the sibling Multigenerational Home Renovation Tax Credit: 14.5%, to a maximum of $7,250.
Four conditions, all CRA’s. The credit is not reduced by government grants or credits, though reimbursement from a non-government source does reduce it. Business or rental-use portions are excluded. Work done by a relative counts only if that relative is registered for HST. And keep the invoices.
The part that changed on 1 January 2026
For 2025, the same expense could be claimed twice — once as a medical expense, once as a home accessibility expense. CRA’s own page says so, and that is not a CRA error. It is the tax-year-2025 rule, and right for the year it covers.
From 2026 it is gone. Parliament deleted a permission that had been deliberately written into the Income Tax Act. The subsection expressly allowing the double claim was repealed by the Budget 2025 Implementation Act, No. 1 — S.C. 2026, c. 3, section 42 — in force 1 January 2026, and Budget 2025’s tax-measures document puts it at “2026 and subsequent taxation years.” What replaced it is an exclusion broad enough to reach any taxpayer in any taxation year, which closes the obvious workaround: two relatives cannot split one bathroom between the two credits.
Pages published this year still tell you that you can claim both. For 2026 work that is no longer right — though if you renovated in 2025 and haven’t filed, the old rule still applies.
Ontario
The Seniors’ Home Safety Tax Credit is the one everyone still sends us. It existed for the 2021 and 2022 tax years only and it is gone: the CRA form is archived and the provincial page redirects.
The live provincial credit is the Ontario Seniors Care at Home Tax Credit: 25% of up to $6,000 of eligible medical expenses, to a maximum of $1,500, for someone who turned 70 or older in the year, reduced by 5% of family net income over $35,000 and nil at $65,000. Its eligible expenses do expressly include renovation that improves a person’s mobility, access or functioning in the home because of a severe and prolonged impairment.
It is a medical-expense credit, not a renovation credit — it applies only to what you could already claim as a medical expense, after the usual medical-expense threshold, and the ceiling is $6,000 of it. Nobody gets 25% of a bathroom back.
The City of Toronto
There isn’t one. The City’s homeowner-support page, updated March 2026, lists no renovation or accessibility funding at all, and the old programme pages are gone. We say it plainly because the dead programme is still cited online.
The Home and Vehicle Modification Program
Real, underused, and carrying one rule that will cost you the whole grant if you get it wrong.
The HVMP is administered by March of Dimes Canada and funded by Ontario’s Ministry for Seniors and Accessibility. The ceiling is up to $15,000 in a lifetime for home modifications — the ontario.ca page gives no figure, so that number is March of Dimes’. It is for people whose disability impedes mobility and substantially restricts daily living; it requires an occupational therapist’s assessment; other public or private funding must be accessed first; there is a household-income threshold above which you contribute; and, in the programme’s own words, there is no guarantee of funding upon application.
Then the one from the builder’s chair, and it will cost you the whole grant if you get it wrong. Nothing started or paid for before approval is reimbursed. Do not sign, do not deposit, do not demolish — and do not let anyone, including us, start until the approval letter is in your hand.
For the wider federal and provincial picture, we keep that in one place too.
The house you stay in is the one you planned for
We have spent more than two decades renovating older homes in the east end, and we hold the CHBA’s Adaptiv Home Specialist certification because this became a large part of the work rather than a sideline. A home we renovated, featured in the Toronto Star in May 2025 is the clearest picture of a finished one.
The people happiest with this work are almost never the ones who did it in a hurry. They are the ones who, in the middle of an ordinary renovation five or eight years earlier, asked what the house would eventually need — and put the blocking in, widened the door while the wall was apart, and ran the drain because it was cheap that week.
They did not build an accessible house. They built an ordinary one that could become accessible without being torn apart to do it.
The house you stay in is the one you planned for, not the one you scrambled in. That is the whole difference.
If you are asking it now, about a specific house — the joists, the doors, the front steps, where the bathroom would go — that is exactly the conversation we like having.
Frequently asked questions
Usually, yes — but not the way it is done in a new build. On 2×8 joists with a plank subfloor there are three honest routes: flush-setting new sheathing between the joists, sistering and dropping a single bay, or using a low-profile pan and raising the rest of the room. Which is available depends largely on which way the joists run relative to the shower entry. The joists themselves stay intact.
It depends on the wall. Widening an opening in a load-bearing wall means a new header and temporary support while the wall is open — that is structural work, and it needs a permit and a drawing. A non-bearing partition generally does not on its own, although the work around it often does. The only way to know is to identify the wall before you start, which is part of the design.
It is the lowest federal tax rate applied to up to $20,000 of eligible work. For 2025 that rate is 14.5%, so the most it can be worth is $2,900. For 2026 the rate is 14%, so the ceiling is $2,800. The rate was cut by Bill C-4, which received Royal Assent in March 2026. CRA publishes the $20,000 limit but not the percentage, so the dollar figure is arithmetic.
For 2025, yes — CRA says so, and that is correct for that year. From 2026, no. Parliament deleted the provision that expressly permitted it, effective 1 January 2026, and replaced it with an exclusion broad enough to reach any taxpayer in any year — so two relatives cannot split one expense across the two credits either. A good deal of material published this year still says otherwise.
No. It applied to the 2021 and 2022 tax years only. The CRA form is archived and the provincial page no longer exists. The live provincial credit is the Ontario Seniors Care at Home Tax Credit — 25% of up to $6,000 of eligible medical expenses, to a maximum of $1,500, for people 70 or older, income-tested. It is a medical-expense credit, not a renovation rebate.
Not at the moment. The City’s homeowner-support page, updated in March 2026, lists no renovation or accessibility funding, and the programme pages that used to carry it are gone. We mention it only because the old programme is still widely cited online, and we would rather you did not build a plan around money that is not there.
The Home and Vehicle Modification Program is administered by March of Dimes Canada and funded by Ontario’s Ministry for Seniors and Accessibility. March of Dimes states up to $15,000 in a lifetime for home modifications, for people whose disability substantially restricts daily living. It needs an occupational therapist’s assessment, other funding must be accessed first, there is an income-based contribution, and funding is not guaranteed. Critically, nothing started or paid before approval is reimbursed.
Blocking for grab bars everywhere one might ever go; a thirty-four to thirty-six inch clear opening anywhere you are already reframing a door; the waste line for a future main-floor bathroom while the floor is open; a straight, stacked run for a possible future lift; and the option of a level entry somewhere on the house, not closed off by a deck or a regrade. All of it is inexpensive while the walls are open.
That depends on how many flights you are actually dealing with, and it is a decision better made at design stage than in a crisis. We worked through the whole one-flight-versus-two question, and the case for leaving room for a shaft rather than installing a lift nobody needs yet, in our post on planning an older house for three generations. The answer starts with counting flights, not with choosing a device.
