Old House Inspection Checklist (Pre-1978 Homes)

Old houses don't fail inspection — they fail the budget six months later. Here are the 9 specific hazards inspectors document but rarely quantify, with the 2026 cost ranges that turn them into a real go/no-go decision.

Why Pre-1978 Is The Cutoff

1978 is when the federal government banned residential lead paint, and it's the year almost every old-house liability law (federal lead disclosure, many state insurance riders, some FHA/VA underwriting rules) draws its line. Houses built before 1978 are not bad — many are better-built than 2010s spec product — but they carry a specific hazard inventory that newer construction doesn't, and lenders, insurers, and buyers all price that inventory in.

The 9 Hidden Hazards — With 2026 Costs

Each item below is something a general inspector will note in the report but typically will not assign a dollar figure to. Use this as your translation layer.

Lead-based paint: Every pre-1978 home is presumed lead until tested. Disclosure is federally mandatory. Encapsulation $8–$15/sq ft; full abatement $10K–$30K+. Insurance impact for families with kids under 6.
Knob-and-tube (K&T) wiring: Common in homes built 1880–1940. Many insurers refuse coverage with active K&T. Full rewire: $8,000–$25,000. Partial removal often required as a closing condition.
Aluminum branch wiring (1965–1973 builds): Fire risk at every termination. Pigtailing with COPALUM connectors: $1,500–$4,000. Full rewire: $8K–$20K.
Galvanized supply plumbing: Common pre-1960. Internally corroded — flow restricts, then ruptures. Full re-pipe: $4,000–$15,000. Often paired with low water pressure complaints.
Cast-iron drain stack: Service life 50–80 years. Audible drain rattle, slow flow upstairs, rust at clean-outs = end of life. Replacement: $4,000–$10,000.
Asbestos (vermiculite attic insulation, pipe wrap, 9x9 floor tile, transite siding/flue): Encapsulation often acceptable; abatement triggers when disturbed. Vermiculite attic removal: $5,000–$30,000. Pipe insulation removal: $400–$2,000 per run.

Specialty Inspections To Order Up Front

On a pre-1978 home, the general inspection is the floor of due diligence, not the ceiling. Add these before signing — total cost is roughly $700–$1,500 and routinely uncovers five-figure issues.

Oil tank scan ($150–$300): Mandatory if the home ever burned oil. Underground tank presence is the single highest-cost surprise in old houses.
Lead paint test ($300–$600): Surface XRF or chip sampling. Required intelligence if you have or plan to have small children.
Sewer scope ($200–$400): Cast-iron and clay laterals are at end of life. See our sewer scope guide for what the camera reveals.
Asbestos visual + sample ($300–$600): Specifically request inspection of attic insulation, basement pipe wrap, and floor tile.
Chimney level-2 ($300–$500): Old chimneys often have unlined flues — fire risk, $3K–$8K to reline.
Radon (48-hr) ($150–$300): Pre-1978 basements often lack vapor barriers. Mitigation: $1,200–$2,500.

Disclosure & Insurance Realities

Old houses interact with the legal and insurance systems in ways newer homes don't. Knowing the rules before you write the offer changes what you negotiate for.

Federal lead-paint disclosure: Sellers must disclose known lead and provide the EPA pamphlet. Buyers get a 10-day inspection right by federal law (often waived — don't waive it).
Insurance carrier underwriting: Active K&T, fuse boxes, oil tanks, and 100-amp service trigger declines or surcharges. Get a written quote before removing the inspection contingency.
FHA / VA loan flags: Peeling paint (lead presumed), missing handrails, broken windows, and active roof leaks all fail FHA appraisal. Cash deals avoid these — financed deals do not.
State-specific environmental rules: MA Title 5 (septic), NY oil tank registration, NJ ISRA. Talk to a local agent before assuming generic federal rules apply.

From Hazard Inventory To 5-Year Plan

An old house is worth buying when you know what's in it. The Inspection Analyzer reads your report and translates lead, K&T, oil tank, and pipe-material findings into a year-by-year cash projection; the 5-Year Forecast tool combines those with normal system replacement curves so you see total carrying cost — not just sticker price — before you close.

Cost range

From specialty inspections to worst-case oil tank cleanup: $700–$100,000