Pre-Code Stairs, Railings and Egress You Will Be Blamed For
Why this matters
Older houses are full of stairs and railings that would not pass today: steep basement stairs with no handrail, porch guards at knee height, balusters a toddler can walk through, a finished attic bedroom whose only window is painted shut. None of that is your trade unless you build stairs. All of it becomes your problem the day someone falls near your work, because the first question after an injury is who was last there and what they touched. The shop that worked beside a bad stair and wrote nothing down has no answer. The one that wrote two lines has one.
The line between their condition and your work
The useful distinction is not old versus new. It is condition you found versus condition you created or changed.
- Found. The stair was steep before you arrived and is exactly as steep when you leave. You did not cause it. Your exposure is mostly about whether you noticed and said so.
- Changed. You took the handrail off to get a water heater down and screwed it back on. You moved a duct and it now hangs lower over the stair. You set a condenser under the only bedroom window. That is your work product, and you own its condition.
- Created. Your equipment, your materials or your crew's setup is the hazard: a hose across the top step, a ladder in the stairwell, a dehumidifier parked in the escape path.
Who carries legal responsibility for a fall on a homeowner's stair is a premises-liability question that turns on state law and the facts: generally the owner or occupier controls the premises, and a contractor can share responsibility for conditions it created, altered or failed to warn about while working. How far that duty to warn reaches varies by state. This is not legal advice; if a fall has already happened, the shop's insurance agent and its attorney get the call before anyone gives a statement. What the shop controls is the record of what it found, changed and created.
What "pre-code" usually looks like
Modern numbers give you a yardstick for recognizing a problem, not a standard you must enforce. The IRC as adopted by your jurisdiction (2021 edition numbering) sets, for new work:
| Element | IRC 2021 | What older houses often have |
|---|---|---|
| Riser height | 7 3/4 in maximum (R311.7.5.1) | 8 to 9 in on basement and attic stairs |
| Tread depth | 10 in minimum (R311.7.5.2) | 8 to 9 in, sometimes less on winders |
| Headroom | 6 ft 8 in (R311.7.2) | Ducts, beams or pipes far lower |
| Handrail | One side, 34 to 38 in, on any flight of four or more risers (R311.7.8) | None, or a loose pipe on brackets |
| Guard trigger | Walking surface more than 30 in above the floor or grade below, measured within 36 in horizontally (R312.1.1) | Open-sided stairs and porches with nothing |
| Guard height | 36 in; 34 in on the open side of a stair, measured from the nosings (R312.1.2) | 24 to 30 in on porches and landings |
| Guard openings | A 4 in sphere must not pass; 4 3/8 in on the open side of a stair (R312.1.3) | 6 in or more between balusters |
| Bedroom escape opening | 5.7 sq ft net clear (5.0 at grade floor), 24 in high, 20 in wide, sill 44 in max (R310) | Small or painted-shut windows, attic rooms with none |
An existing stair is generally allowed to stay as built until someone alters it or an official finds it unsafe, under whatever existing-building rules your jurisdiction applies (the International Existing Building Code where adopted, or a local ordinance). An alteration to the stair itself is usually expected to meet current rules as far as practical, which is one reason a handyman asked to "just add a rail" should check whether that is a permitted alteration where they work.
Where this lands on each trade
- HVAC, plumbing, appliance. Basement and attic stairs are where you carry heavy equipment. Duct and pipe runs set headroom. Condensers and line sets end up under bedroom windows.
- Painters, cleaners, window crews. You are on porches and stairs all day, and you are the trade most likely to notice a guard that moves.
- Handyman, carpentry. You are the trade most likely to be asked to fix it, and the one whose fix is an alteration.
- Electricians. You light stairways and decide where switches go. A dark stair with the only switch at the bottom is a fall.
- Pool and deck-adjacent trades. Deck guards and stairs to a pool deck carry the same rules outdoors.
The two sides of the duty: your crew and their people
Your crew is yours. Moving a 150-pound appliance down a steep stair with no rail is an employer hazard. Plan the carry: a stair-rated dolly with straps, two people minimum, a third at the bottom clearing the path, a temporary light if the stairwell is dark, and nobody walking backward down a stair without a hand on something that holds. If the stair cannot take the carry, the job needs a different route: a bulkhead door, a window well, or the unit broken down into parts.
Their people get a warning from you, not a rebuild. A child, a guest or an elderly parent uses that stair after you leave. Telling the customer, in plain words, what you saw is the move, and writing it down is what makes it real. Fixing it uninvited is not: an unpermitted rail you installed for free is now your work product, built to whatever standard you guessed at.
Worked example: a furnace change in a 1938 basement
An HVAC crew is replacing an upflow gas furnace in the basement of a 1938 house. The only access is an interior stair.
What the lead measures before the old unit moves.
- 11 risers at about 8 1/4 in each, for a total rise of about 90 3/4 in (11 times 8.25).
- Treads about 8 1/2 in deep.
- No handrail. One side is a wall; the other is open to the basement floor.
- One bulb at the top, switched only at the top.
- At the fourth tread from the top, a supply trunk crosses the stairwell with about 6 ft 1 in of headroom.
How the lead reads it. Every element is short of the yardstick: risers about half an inch too tall, treads an inch and a half too shallow, headroom 7 in short of 6 ft 8 in. The flight has far more than four risers and no handrail. On the open side, the walking surface passes 30 in above the floor partway up: each riser is about 8 1/4 in, so the third tread from the bottom sits about 24 3/4 in up and the fourth about 33 in up, and everything from the fourth tread from the bottom to the top is above the guard trigger with nothing there.
The fork that matters: the duct is theirs today and might be ours tomorrow. The trunk over the stair is existing ductwork. The new furnace has a taller cabinet, and the first plan drops the supply plenum and reconnects the trunk about 3 in lower to fit it. That would take headroom from 6 ft 1 in to about 5 ft 10 in, and the shop would have created a lower hazard over a stair where somebody already hits their head. The lead changes the plan: the transition is reworked so the trunk keeps its present height, at about 1.5 extra hours of labor, and that goes on the ticket as the reason.
The carry. Two techs and a stair dolly, a third at the bottom. A clamp light at the bottom of the stair so the lower treads are lit. The open side is the danger side, so the dolly runs against the wall side.
The note. Written on the job record and the invoice, read to the customer at the end:
EXISTING CONDITIONS - NOT ALTERED BY US
Basement stair: 11 risers about 8 1/4 in, treads
about 8 1/2 in. No handrail. Open side has no
guard; drop to concrete over 30 in from 4th tread
(from bottom) up. Headroom about 6 ft 1 in at supply duct
(4th tread from top), unchanged by this job.
Stair light switched at top only.
Recommend evaluation by a carpenter. Told
homeowner in person at job close.
Why it is written that way. Measured values, not adjectives: "steep" is an opinion, "8 1/4 in" is a fact a later reader can check. "Not altered by us" and "unchanged by this job" are the two phrases that separate found from changed, and the duct line exists because the duct is the one element this trade could have changed. "Told homeowner in person" records the warning.
What would change the call. If the lead had found that the new furnace could only fit with the lower trunk, the right move would be to stop and tell the customer before doing it, offer the alternatives (a different cabinet, a rerouted trunk), and get a written choice. Building the lower duct and noting it afterward would turn a found condition into a created one. And if the shop is a handyman outfit asked to add the rail on the same visit, that rail is new work: whether it needs a permit depends on the jurisdiction, and two or three phone calls to the building department settle it before the quote goes out.
The escape-route version of the same note
Bedroom egress works the same way. If your install touches the only window in a bedroom (a window unit, a condenser under it, a line set through it, a security bar you mount), state whether the window still opens fully from inside without tools after your work. If it was painted shut or blocked before you arrived, the note says so and says "not altered by us." The window sibling card covers painted-shut sashes; the principle is the same.
References
- See related: Weight-and-Pulley Windows and Painted-Shut Sashes; How to Write the Legacy-Material Note on an Invoice
- See related: Recognize, Record, Route: The Rule for Legacy Materials
- International Residential Code R310, R311.7 and R312, 2021 edition, as adopted by your jurisdiction
- International Existing Building Code, where your jurisdiction has adopted it, for when an existing stair must be brought up