Some houses look like great deals because the numbers are great. Then you find out why.
The cracked foundation the seller painted over. The septic system that failed last spring. The heir nobody mentioned who has to sign. The flood zone that changes the insurance — and the buyer pool.
I’m Ben Lovro. I buy houses from sellers across the South Carolina Midlands, including plenty of older homes, rural properties, and land with mobile homes. Over the years I’ve learned that the most important part of analysis isn’t the math. It’s the list of things that can make the math irrelevant.
Here are the red flags I check before I sign anything, and how I decide whether each one is a repair item or a reason to walk.
Repair item or deal killer?
Every problem falls into one of two buckets:
- Repair items — known problems with a known fix that you can price, schedule and finish. These go into your repair estimate and your contingency.
- Deal killers — problems that are open-ended, uninsurable, unfinanceable, unsellable, or that you can’t fully understand before closing. These either require a much deeper discount or a polite no.
The same issue can land in either bucket depending on how much you can learn about it. Uncertainty is the real enemy. A known problem is just a price.
Red flag 1: foundation and structure
What to look for: - Stair-step cracks in brick or block - Doors and windows that stick or won’t latch - Sloping or bouncy floors - Gaps between walls and ceilings or trim - Sagging rooflines - Rotten or undersized framing in the crawlspace
How I handle it: I get a qualified professional to assess it and give me a written scope before I commit. If the fix is defined, it becomes a line item with extra contingency. If nobody can tell me what’s wrong or how far it goes, I walk — or I price the uncertainty heavily.
Red flag 2: water
Water is the root of most expensive problems. It rots wood, feeds mold, undermines foundations and invites pests.
What to look for: - Ceiling stains and fresh paint patches in odd places - Musty smells, especially in the crawlspace or closets - Standing water or moisture under the house - Soft subfloor around tubs, showers and toilets - Grading or gutters that send water toward the house - Efflorescence (white mineral deposits) on block walls
How I handle it: find the source before you price the damage. A fixed source plus damage repair is a line item. An unknown source is a risk.
Red flag 3: septic and well
In rural parts of the Midlands — and in a lot of land and mobile home deals — you’ll run into private septic systems and wells.
What to look for: - Soggy ground or odors near the drain field - Slow drains throughout the house - No records of pumping or inspection - Water quality or flow concerns with a well
How I handle it: get a septic inspection and, where relevant, well testing during the inspection period. A failed system can be a major repair, and site conditions can limit your options. The land due diligence page goes deeper on this.
Red flag 4: title
You can’t fix a house you can’t legally own. Title problems are among the most common reasons deals fall apart late.
What to look for: - Liens — mortgages, judgments, tax liens, mechanic’s liens - Missing heirs or co-owners who need to sign - Estates without a personal representative appointed - Boundary disputes or encroachments - Unrecorded or defective prior deeds
How I handle it: in South Carolina, I close with a real estate attorney who runs title. Any problem gets surfaced and solved before closing, or the deal waits. If you’re working probate or inherited properties, see the probate leads page for how those situations tend to come up.
Red flag 5: zoning and permitted use
You plan to add a unit, rent to multiple tenants, place a mobile home or split a lot — and then learn the zoning doesn’t allow it.
What to look for: - The current zoning designation and what it permits - Any unpermitted additions, conversions or garage apartments - Restrictions on mobile or manufactured homes - HOA covenants that restrict rentals or changes
How I handle it: check with the local planning and zoning office before you rely on any use that isn’t already clearly permitted. Unpermitted past work can surface at resale or with a lender.
Red flag 6: flood zone
A flood zone designation can change insurance costs, lender requirements and how many buyers are willing to look at the house.
What to look for: - The property’s designation on FEMA flood maps - Proximity to creeks, rivers and low-lying areas - Signs of past flooding: water lines, sediment, warped materials
How I handle it: get an insurance quote before you commit, not after. Factor it into both your holding costs and your resale or rental analysis.
Red flag 7: functional obsolescence
Sometimes the problem isn’t broken. It’s just wrong for the market.
Examples: - A bedroom you can only reach by walking through another bedroom - One bathroom in a house where buyers expect two - A kitchen too small for the price point - A layout that’s chopped up by past additions - A house that’s much bigger or smaller than everything around it - An oddly placed lot — backs to a busy road, commercial use, or a rail line
How I handle it: ask whether it can be fixed within a sensible scope — and whether the fix gets paid back. Remember: my first-flip rules say no moving walls. If the only fix is structural, the deal needs to be priced for that or skipped. See how to flip a house for beginners for why.
Other red flags worth a look
- Old electrical — outdated panels, ungrounded wiring, DIY work
- Old plumbing — failing supply lines or drain lines
- Roof — multiple layers, soft spots, active leaks
- Termite or wood-destroying insect damage — common in the South
- Environmental concerns — lead paint in older homes, buried tanks, nearby contamination
- Tenant-occupied properties — leases, deposits and tenant rights transfer with the property; read every lease
A simple red-flag workflow
- Ask the seller direct questions about water, foundation, roof, systems, title and permits — and write down the answers.
- Walk the house with your repair sheet and mark anything in the “suspect” column.
- Use your inspection period for professional inspections on anything suspected.
- Check flood maps, zoning and HOA rules before you commit.
- Let your closing attorney run title and raise issues early.
- Decide: repair item with a price, or deal killer.
How red flags change the numbers
Any red flag you decide to accept should show up in your analysis:
- A higher repair estimate and a bigger contingency
- A longer timeline and more holding cost
- A more conservative ARV if the issue affects resale
- A tighter MAO — see the maximum allowable offer formula
If the deal still works after all of that, great. If it only worked before you found the problem, the deal was never real.
Your next step
Before your next offer, run the property through this list — every item, every time. Then put the numbers through the full sequence on how to analyze a real estate deal. If you’re unsure whether something is a repair item or a deal killer, post it in REI Skool. Someone in that room has seen it before.
Questions people ask
What should I look for when buying a fixer upper?
Start with the expensive, hard-to-fix items: foundation, water intrusion, roof, electrical, plumbing and drain lines, and septic or well if present. Then check title, zoning, flood zone and whether the layout works for buyers or renters in that area. Cosmetic issues are usually the easy part.
Is foundation damage always a deal killer?
Not always. Some foundation issues are well-understood repairs; others are open-ended. Get a qualified professional’s assessment and a written repair plan before you commit, and price in uncertainty. If you can’t get clarity, treat it as a deal killer.
How do I check if a property is in a flood zone?
Look up the property on FEMA’s flood maps, ask the insurance agent for a quote before you commit, and look for physical signs like water lines, sediment or moisture in crawlspaces. A flood zone designation can affect insurance cost, financing and resale.