A buyer I have not met sent me a message a few weeks ago. She closed in February on a flipped house in Worthington. By April she had water in the dining room. The contractor she hired pulled the south-facing siding and found rot the seller had painted over six months before listing. The home inspector did not flag any of it. Her quote to replace the siding, the sheathing, and the affected insulation is just over $34,000.
She is not unusual. I have walked at least 40 flipped houses across Westerville, Dublin, Powell, UA, Bexley, Worthington, and Clintonville in the last 12 months. I see the same six things every time. Flippers know exactly what an inspector checks. They paint and patch around it.
This is not a hit piece on flippers. There are good operators in Central Ohio who replace what is broken and disclose what they could not get to. There are also operators who buy a tired 1987 colonial for $385K, spend $40K on cosmetics, list it at $625K, and never touch the rot. Both ship to the MLS. You cannot tell which is which by looking at the listing photos.
What you can tell, if you know what to look at, is whether the house has the six tells below. Each one is a defect that will cost you $5,000 to $40,000 if you miss it. Each one looks fine when an inspector walks the property. That is the whole point. The inspector's job is to report visible conditions inside the standard of practice. These defects live just outside that line by design.
Three generations of build knowledge in my family taught me where to look. My dad and grandfather were carpenters. I am a Realtor. The patterns travel through to me because I grew up watching them work. None of this is hard. It is just specific.
Defect 1: Fresh paint on the south-facing siding
What it is. South-facing siding takes the most UV and the most weather. On Central Ohio 1985-2005 houses, the most common siding was LP, hardboard, or cedar. LP siding from that era had a class action lawsuit for moisture failure. Hardboard and cedar both rot at the bottom edges and around windows when paint fails or flashing is missed. Flippers spray the south face only and call the house "freshly painted."
Why it costs. $8K to $25K to pull and replace the rotted boards plus the wet sheathing behind them. $30K plus if the rot got into the studs.
The tell at the showing. Walk the perimeter of the house. Compare the south elevation paint to the north, east, and west. If the south side looks newer than the rest, that is your signal. Push a brass key into the seams under windows and at corner trim. If the key goes in instead of stopping at solid wood, the substrate is gone. Look for paint that does not quite match the trim color, especially around windows.
How to verify. Ask the listing agent for the siding age and any siding-repair receipts. Ask your inspector to specifically check moisture content with a pin meter on the south wall, not just visually inspect. If the seller refuses to disclose siding age, that is your answer.
Defect 2: Painted-over efflorescence on basement walls
What it is. Efflorescence is the white crystalline deposit that forms when water moves through concrete block and pulls salts to the surface. It only forms when water is actively coming through. Flippers paint over it with fresh white or grey wall paint on the bottom 18 inches of the unfinished basement walls.
Why it costs. The fix depends on the source. Exterior waterproofing runs $8K to $20K per affected wall. Interior drain tile plus sump runs $5K to $12K. Doing nothing means it comes back, and the next buyer is your problem.
The tell at the showing. In the unfinished basement, look at the bottom 18 inches of block walls. Fresh paint that does not extend the full height of the wall is the signal. Look at the slab where it meets the wall. Chalky white residue or recent concrete patches are confirmations.
How to verify. Ask your inspector to bring a hygrometer and read humidity at multiple points in the basement. Ask for the dated invoice on any waterproofing the seller claims to have done.
Defect 3: Drylock or masonry sealer hiding active seepage
What it is. Drylock and similar masonry sealers are useful as one layer of a real waterproofing system. They are not a fix on their own because they do not address the source: poor lot grading, blocked gutters, or a missing sump. Flippers roll Drylock onto the interior of basement walls because it is a $200 fix for a $15K problem.
Why it costs. Same as above. Sealer alone fails. The water finds another path. You will pay for real waterproofing within three years.
The tell at the showing. Look for fresh Drylock on basement walls that was not in the prior MLS history photos. Many flipped houses have prior listings in the MLS archive. If the basement in the 2021 photos was bare block and the 2026 listing photos show grey walls, the seller added the sealer. Outside, walk the perimeter. Check the downspout discharge point. If the gutters drop water within four feet of the foundation, the seepage is going to keep coming.
How to verify. Ask the listing agent for the sump pump age and any waterproofing receipts. Ask your inspector to specifically test the downspout discharge during the inspection by running water from a hose into the gutter.
Defect 4: Fresh caulk on roof valleys, flashing, and chimney saddles
What it is. Caulk is sealant. It has a five to seven year service life. Metal flashing is the structural water barrier. It lasts 20 to 40 years. When you see visible new caulk on roof flashing, valleys, or chimney saddles, the flipper patched a recent water entry path instead of replacing the flashing. The leak comes back when the caulk fails.
Why it costs. Reroof on a 2,800 SF Central Ohio home runs $12K to $18K. If the leak got into the attic decking, add another $3K to $8K for sheathing replacement and insulation remediation.
The tell at the showing. Stand back in the yard. Look at the roof with the binoculars on your phone camera (zoom in on a photo). Valleys should look like clean metal or asphalt. Chimney saddles should show original step flashing, not a bead of bright white sealant. Around skylights and pipe boots, same rule. Fresh caulk equals recent leak.
How to verify. Ask the listing agent for the roof age in years and the original invoice. If the roof is over 15 years old and there is fresh caulk on the flashing, your inspector should walk the roof and check the attic for water staining.
Defect 5: Painted soffits and fascia hiding pest damage
What it is. Squirrels, bats, and woodpeckers chew through soffit panels at roof-soffit junctions and gable ends. Once they are in your attic, they nest, chew wiring, and ruin insulation. Flippers paint over the chewed holes or replace one or two panels and paint the whole soffit to disguise the patch.
Why it costs. Pest removal, attic remediation, insulation replacement, and proper soffit repair runs $4K to $12K. If wiring is involved, add an electrician.
The tell at the showing. Walk around the corners of the house and look at the soffit panels. Look for panels that do not match the run, panels with brush strokes among an otherwise sprayed assembly, or new screws where the rest of the panel uses nails. Check the gable ends, especially where the roofline meets at peaks. Wasps and bats love those corners.
How to verify. Ask your inspector to pull down the attic access and look for nesting evidence, gnawed insulation, or daylight visible at the soffit-roof connection. Ask the seller directly if there has ever been pest activity in the attic. Watch the eyes when they answer.
Defect 6: Quick-coat counters and floors over failing subfloors
What it is. Central Ohio kitchens built between 1985 and 2005 commonly used OSB or particleboard subflooring. Both swell and lose structural integrity when wet. After 20 to 30 years of dishwasher leaks, sink drips, and refrigerator water lines, the subfloor under the kitchen often has soft spots. Flippers install new flooring and granite or quartz counters on top of the failing substrate because the substrate replacement is the expensive part of a kitchen redo.
Why it costs. Replace the kitchen subfloor and reset the cabinets and counters: $8K to $20K depending on cabinet damage. If you do nothing, the new floor will eventually delaminate from the soft substrate and you pay for two kitchen redos in a decade.
The tell at the showing. Walk the kitchen slowly. Stand on every quadrant. Listen for creaks. Feel for bounce, especially in front of the dishwasher and under the sink. New flooring on a flexible substrate has a particular soft feel that is not the same as a solid floor. Look under the sink for water staining on the cabinet floor. Look at the dishwasher's bottom panel for rust.
How to verify. Ask the seller if the subfloor was inspected or replaced during the renovation. Ask your inspector to specifically test the kitchen floor with a moisture meter under the sink and to pull the dishwasher's bottom panel for a look.
The bonus rule: check the mechanical date plates
This one is not a hidden defect. It is a disclosure gap. Flippers are not legally required to disclose the age of the furnace, AC, or water heater unless the unit is currently failing. So they leave 25-year-old mechanicals in "fully renovated" homes and let the new buyer find out.
Every furnace, AC condenser, and water heater has a metal plate with a manufacture date or serial number. Look for it. Furnaces and AC: usually a sticker on the side of the cabinet. Water heater: serial number plate on the front. Decode the serial number with a 30-second Google search of the brand. If your "newly renovated" Westerville house has a 1998 furnace, the new owner will replace it within two years.
How to use this list
Take it to your next flipped-house showing. Walk the perimeter first. Walk the basement second. Walk the kitchen third. Look up at the roof and soffits last. Compare what you see to the listing description. If the description says "fully renovated" or "new everything" and you see two of the six tells above, ask the listing agent specifically about each one and ask for receipts. If they cannot produce paperwork, walk away or write the offer at the rehab-budget price, not the flip-resale price.
A good inspection is worth every dollar. A good inspection plus your own eye for the tells above is worth $20K to $40K of avoided surprise.
If you want me to walk through a specific Central Ohio flipped house with you before you write an offer, that is what I do every week with clients. Call me. I will look at the same things I just listed, plus a dozen more. Twenty minutes, real numbers, no pressure.