Dad has agreed that the back steps are too dark. Good. That is not permission to turn a bulb change into an electrical project while standing on a kitchen chair.
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The decision is narrower: can you restore useful light with a bulb and work you can reach safely, or does the job belong to a licensed electrician?
Start with the route, not the fixture. Walk from the door to the first level surface after dark. Stand where Dad stands when he reaches for the lock. Look for the tread edges, landing, handrail, threshold, and any change in direction. Ask him where the light fails him. He may care less about brightness than glare in his eyes or a switch he cannot reach from the door.
Prove whether the bulb is the whole job
During daylight, turn the light on and check it from the ground. If the fixture is intact, dry, firmly mounted, and reachable from a stable step ladder placed on a level surface, a bulb change may be a reasonable do-it-yourself job.
Before climbing, find the fixture label or photograph it with your phone. Record the permitted bulb type and maximum wattage. Use a bulb listed for the fixture location. An enclosed fixture, a damp location, and an exposed wet location are not interchangeable conditions. The fixture label and bulb packaging settle those questions better than the bulb that happened to be installed.
Turn the wall switch off and let the old bulb cool. If there is any chance someone could flip the switch, mark it or have another person guard it. Do not lean sideways from the ladder. Climb down and move the ladder. The Consumer Product Safety Commission warns that metal ladders can conduct electricity and advises keeping ladders away from electrical hazards (CPSC, Ladders and Electricity Don't Mix).
Stop if the bulb base is corroded, the socket moves, glass is broken, water is inside the fixture, insulation looks scorched, or the breaker trips. Those are not bulb problems.
The line between maintenance and electrical work
Changing a compatible bulb is maintenance. Replacing a fixture, moving a box, adding a switch, extending cable, or installing a new light is electrical work. The distinction matters because local permit and licensing rules attach to the work, not to how confident the person holding the screwdriver feels.
Inside the City of St. Louis, an owner of an owner-occupied single-family home may qualify to obtain an electrical permit for certain repairs or modifications after passing the Building Division's knowledge test. Service changes, rehabilitation work, and new construction must be performed by a licensed contractor (City of St. Louis Building Division, Apply for an Electrical Permit).
In St. Louis County, the enforcement authority depends on the address and municipality. County guidance says electrical work is performed by licensed electrical contractors, while a homeowner seeking to do permitted work may need prior authorization and an examination. The county also maintains a municipal contracts matrix because some municipalities use county enforcement and others do not (St. Louis County Department of Transportation and Public Works, Residential Repair and Renovations Checklist and Guide).
Do not settle this by saying the house has a St. Louis mailing address. Find out whether the property is in the city, unincorporated county, or a municipality. Then call the building or electrical office that serves the exact address. Ask: “Does replacing this existing exterior fixture require a permit, and may the homeowner perform the work?” Write down the office, the answer, and the name or reference number attached to it.
A City historic district or landmark adds another check. The Cultural Resources Office identifies exterior lighting fixtures and conduit as work that can require its review even when ordinary building-permit rules would not require a permit (City of St. Louis Cultural Resources Office, CRO Review FAQs).
Hire when access is the real hazard
A bulb can be simple and still be a bad do-it-yourself job. Hire help if reaching it requires a ladder on steps, soil, a sloped walk, or a narrow landing. The same answer applies if you would need to reach over a railing, work above an open stairwell, or carry tools while climbing.
Do not ask Dad to steady the ladder. That gives both of you a job neither of you should have.
If the fixture is high but otherwise sound, an electrician may be more work than the bulb requires. A handyman or insured maintenance provider may be able to replace the bulb without altering wiring, subject to local rules. Describe the task accurately: exterior bulb replacement at a specific height over steps. Ask who supplies the ladder, whether the worker is insured, and what happens if the socket proves damaged. The moment the job reaches wiring, use a properly licensed electrical contractor.
Hire when the fixture tells on the wiring
Use an electrician if the light flickers with a known-good bulb, works only when the switch is held a certain way, buzzes, smells hot, shows corrosion, contains water, trips a breaker, or has loose or damaged parts. Leave the circuit off if there is heat, arcing, exposed conductor, or repeated breaker operation.
Also hire when there is no fixture where the route needs light. Adding a new box or circuit is not a bulb upgrade. It is a wiring project. Ask the electrician to quote the complete path: power source, switch location, cable route, box, exterior-rated fixture, wall penetrations, permit responsibility, inspection, and repair of any opened finish.
Make the quote name the useful result
Tell each electrician what Dad needs to see rather than prescribing a product. Use the same scope for every conversation:
“Light the threshold, landing, tread edges, handrail, and path to the level walk. Keep direct glare out of the eyes of someone opening the door. The light must operate from inside before the door opens.”
Then ask each contractor:
Will you reuse the existing box and wiring, or have you allowed for repair? Is the proposed fixture listed for this exact outdoor exposure? Who obtains any required permit and schedules inspection? Will the switch remain where Dad can reach it? How will the fixture be aimed so it lights the steps without shining into his face? Who patches penetrations or siding disturbed by the work? What test will you perform from the door, landing, and bottom step before leaving?
If the answers differ, do not compare totals yet. First make the scopes match.
Test the route with Dad, not for Dad
After the bulb or fixture works, test it after dark with Dad present. He does not need to walk the steps to prove anything. Let him stand safely inside the open doorway and tell you what he sees.
Check whether the switch is identifiable in the dark, the threshold casts a shadow, the tread edges remain visible, or the fixture creates glare when he looks toward the handrail. Walk the route in both directions. A light that helps on the way out may shine directly into his eyes on the way back.
Do not add a motion sensor without discussing how it behaves. Ask how long the light stays on, whether it can be switched on continuously, what movement activates it, and whether approaching from the yard triggers it before the first step. Dad may reasonably prefer a plain switch that behaves the same way every time.
If the address or permitting office is unclear, use Local Help in St. Louis to identify the right jurisdiction. Supporting source notes are collected on the site's Sources page.
Your next move tonight
Do not buy a fixture tonight. Turn on the back light, walk the route after dark, and take three photographs: the fixture from the ground, the ladder location, and the steps as Dad sees them from the door. If the fixture is sound and the ladder can stand level without touching the steps, record the fixture label and buy only a compatible bulb. If access is awkward or you find water, corrosion, movement, heat, flicker, or damaged parts, leave the circuit alone and call the electrical office for the address before asking a licensed electrician for the complete scope.