Nobody walks through a property showing thinking about bed bugs. You're checking water pressure, closet space, whether the kitchen gets afternoon light, maybe how bad the traffic noise is with the window cracked. But bed bugs are one of those problems that can turn a great-looking unit into a legal mess almost overnight, and most people have zero idea what bed bug exterminator cost actually looks like until they're already stuck dealing with one.

I've watched this play out with landlords more times than I'd like. Tenant moves in, finds bites a few weeks later, and suddenly everyone's arguing over who's on the hook and how much it'll cost to sort out. It's rarely a fun conversation, and honestly, most of that fight is avoidable. You just have to know what to look for before the lease gets signed, not after the tenant's already unpacked and furious.

What actually gives bed bugs away during a walkthrough

They don't announce themselves, that's the annoying part about them. Nocturnal, hide in seams and cracks all day, and a small infestation can sit there for weeks without anyone noticing a thing. A few things I'd actually check in an older building, or honestly any unit that's had a couple tenants come through it already. Rust-colored spotting along the mattress seams and baseboards is a big one, and yeah, that's dried excrement, not blood, no matter what it looks like at first glance (I know, not pleasant, but it's the giveaway). Sometimes there's a faint sweetish smell in the bedroom too, no obvious source for it. People describe it differently every time, musty to some, a bit like coriander to others. And every so often you'll spot small reddish stains on the sheets from a bug that got crushed overnight without anyone noticing.

None of that on its own proves anything, to be fair. Two or three of them together, though, especially close to the bed frame or in a place that's sat empty a while, that's worth a second look before anyone signs anything.

What it actually costs to fix

Here's what catches most first-timers off guard, landlords included honestly. This isn't a hundred-dollar fix you knock out on a Saturday afternoon. It really depends on how big the unit is, how far things have already spread, and which treatment route you end up going. Early cases caught in a single room can run around five hundred dollars, which isn't bad. A bad whole-property infestation needing heat treatment, though, that can climb past four thousand pretty fast.

Heat treatment costs more upfront because it usually wipes everything out in one visit, no repeat trips needed. Chemical treatment is cheaper per visit but you're often looking at two or three follow-ups before the whole breeding cycle actually breaks. There's a Houston pest control team that put together a pretty thorough cost breakdown by property size and severity, plus a checklist for what an honest quote should actually include. Worth a look if you're a landlord trying to budget this out, or a tenant wondering whether the number you got quoted is even fair.

If you're the buyer here, that price range actually matters at the negotiating table. A confirmed infestation found during inspection is a fair enough reason to ask for a discount, or a pre-closing treatment clause written into the deal. It doesn't have to be a dealbreaker, not by itself anyway.

Who's actually responsible

This one comes up constantly, and the real answer is: it depends where the infestation started, and what your local landlord-tenant law actually says. Most places, if the unit had bugs before the tenant moved in, that's the landlord's problem to fix, full stop. If it shows up after move-in and traces back to something the tenant brought in with them, responsibility can shift onto them instead. Either way, having a documented inspection from before move-in day protects everybody involved, it's proof of the unit's condition before anyone's furniture ever showed up at the door.

How to spot bed bug shells before you sign anything

Honestly, the best early sign isn't a live bug at all, it's what they leave behind. Bed bugs shed their exoskeleton several times as they grow, and those leftover bed bug shells are tiny, pale, the kind of thing you'd walk right past without ever noticing if you didn't already know to look. Mattress seams, box spring corners, the folds in upholstered furniture near wherever people actually sleep, that's usually where you'll find them if they're there at all.

A Houston-based pest team put together a pretty detailed breakdown of what these shed skins look like at each growth stage. Genuinely useful if you've ever found something weird in a unit and couldn't tell whether it was real bed bug evidence or just dust and lint that got swept into a corner.

For property managers running several units, checking for shells is more of a habit than a task at this point. Five minutes on the mattress and baseboards between tenants, costs nothing, takes barely any time, and it catches most problems long before they turn into a four-figure treatment bill and a one-star review sitting online for the next three years.

Bed bugs aren't really a reason to walk away from a good property, not on their own. They're a reason to look a little closer before you sign anything, and to at least know roughly what you're dealing with if something does turn up down the line.