Electrical
- Rewiring knob-and-tube: $10,000 to $25,000+.
- Replacing a Federal Pacific or Zinsco panel: ~$1,500 to $4,000.
- Remediating aluminum wiring connections: ~$50 to $100 each ($2,000 to $5,000 typical whole-home).
- Upgrading an undersized service to 200 amps: ~$2,000 to $4,000.
Plumbing
- Repiping poly-B: $6,000 to $18,000.
- Repiping galvanized supply: $6,000 to $15,000.
- Replacing a lead service line: $2,000 to $8,000 (your city may cost-share).
- Replacing a water heater: ~$1,800 to $2,800 (owned tank).
Roof & structure
- A re-roof: $8,000 to $18,000.
- Sealing minor foundation cracks: $500 to $2,000; structural repair $5,000 to $40,000+.
- Regrading and drainage: $500 to $3,500.
Health & safety
- Radon mitigation: ~$2,500 to $3,500.
- Vermiculite / asbestos abatement: $10,000 to $30,000+.
- An oil tank removal is modest, but a leak cleanup can run $10,000 to $100,000+.
How to use these numbers
These are 2026 ballparks that vary widely by region, size, and access. Treat them as a starting point: when Casaroo flags an issue, get a licensed contractor's quote, then use it to negotiate the price or ask the seller to fix it before closing. Every figure here is searchable in the home repair cost lookup, and if you have already found problems at a showing, the offer adjustment calculator turns them into one defensible range sorted by what needs doing first.