I've been fixing houses since before cordless drills. You don't have to learn the hard way. If you're thinking about bringing an old house back to life, you need a realistic old house restoration cost breakdown. Not the numbers from a TV show. Not what your buddy paid in 2019. The real numbers, from a guy who's written the estimates for 38 years.
Here's the bottom line: A full restoration of a 1500-square-foot house built before 1950 will run you between $80,000 and $150,000 in most markets. That's if you hire a crew. Do the labor yourself and you might cut that by a third, but you'll take two years and probably mess something up. Ask me how I know.
Let me walk you through the major cost buckets. This old house restoration cost breakdown covers the three biggest money pits: structure, mechanicals, and finishes.
The Structure: Foundation, Framing, and Roof
An old house sits on something. If that something is a crumbling foundation, you're in for a big number. Patching a few cracks with hydraulic cement costs maybe $500. But if your fieldstone foundation is bowing inward, you're looking at helical piers or a full underpinning — $15,000 to $40,000 depending on the size of the house and how bad the settlement is.
Framing repairs are usually cheaper. Sills rot, joists sag, and floor systems get cut up by plumbers who didn't care. Replacing a rotted sill in a 30-foot wall runs about $1,200 in labor and materials. Sistering a few floor joists? $150 each. But if you got termites and the whole first floor is soft, budget $8,000 for new subfloor and framing.
Roof replacement on an old house is different from a new build. You can't just slap shingles over everything. Many old roofs have skip sheathing that needs to be stripped and replaced with OSB. A standard asphalt shingle roof on a 1,200-square-foot footprint costs $8,000 to $12,000. Add $3,000 if you need to replace the decking.
This old house restoration cost breakdown doesn't include surprises. And old houses always have surprises. I once pulled off a ceiling and found the second floor was held up by a single 2x8 that had been notched for plumbing. That fix cost the homeowner $4,500. He cried a little. I don't blame him.
The Mechanicals: Electrical, Plumbing, and HVAC
This is where most first-timers underestimate the old house restoration cost breakdown. Knob-and-tube wiring isn't just old — it's dangerous and uninsurable. Rewiring a 1,500-square-foot house costs $8,000 to $15,000. That's for new Romex, a 200-amp panel, and grounding. If you want to keep the original push-button switches for looks, add $100 per switch for a reconditioned unit (if you can find one).
Plumbing is worse. Galvanized steel pipes rust from the inside out. You don't see the leak until the pipe bursts. A full repipe with PEX runs $4,000 to $8,000 for a small house. Cast iron drains? Expect $5,000 to $10,000 to replace with PVC. And if you have a lead service line from the street, the city might require you to replace it. That's another $3,000 to $5,000.
HVAC in an old house is a headache because the ductwork doesn't exist or is undersized. High-velocity mini-duct systems work well and cost $10,000 to $15,000 for a full house. Or you can do a ductless mini-split system at about $4,000 per zone. But no matter what, you'll need to insulate. Uninsulated walls in an old house waste energy like a screen door on a submarine. Blown-in cellulose insulation in 1,500 square feet of walls is around $3,000.
The Finishes: Windows, Floors, and Trim
Windows on an old house are a special kind of heartbreak. Original wood windows, if they're in decent shape, can be restored for about $400 each (stripping, reglazing, weatherstripping). New wood windows that match the historic profile cost $800 to $1,200 each installed. I tell people: if the old ones are still solid, keep them. A good window restoration lasts another 40 years.
Hardwood floors are usually a win. Original oak or pine floors can be sanded and refinished for $3 to $5 per square foot. That's a bargain compared to new hardwood at $10 to $15 per square foot installed. But if the floor is too thin or water-damaged, you're out of luck. Budget for patching in new boards, maybe another $500 for a whole room.
Trim and plaster are where the labor adds up. Plaster walls are a pain to patch and even worse to remove. Patching a single crack with plaster of Paris costs $20 in material but takes two days of labor because of drying time. I charge $45 per square foot to skim-coat a whole room. That's not a typo. If your plaster is beyond saving, hanging drywall over it is $2.50 per square foot, but you lose the original character.
Door and baseboard trim in old houses is often a mix of species and profiles. Replicating a single custom baseboard profile costs $150 per 10-foot length from a millwork shop. If you have 200 linear feet of baseboard, that's $3,000 just for the material. Labor to install is another $1,000 to $2,000.
Putting It All Together: Your Total Budget
Here's a rough math for a 1,500-square-foot house with a moderate restoration scope: structural work $15,000, roof $10,000, electrical $12,000, plumbing $8,000, HVAC $12,000, windows (10 at $800) $8,000, flooring (500 sf at $4) $2,000, plaster and trim $5,000. That's $72,000 before permits, paint, appliances, and your own labor. Add 15% for contingencies, and you're at $83,000. That's a realistic old house restoration cost breakdown for a typical project.
Of course, I've screwed up plenty of jobs too. Once I bid a kitchen reno and forgot to include the ductwork for the range hood. Cost me $1,200 out of my own pocket. You don't have to learn the hard way. Use this breakdown as a starting point, and always get three bids. If one bid is half the others, run. If one is double, he doesn't want the job. The middle one is usually your guy.
I've been fixing houses since before cordless drills. You don't have to learn the hard way.
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