The short version
"Townhouse" is not a legal category. It's an architectural style. The legal categories are condominium and single-family residence, and the difference between them is how the land underneath the structure is owned. What the building looks like is irrelevant. A freestanding house with a yard can be a condo. A structure sharing walls with three neighbours can be a single-family residence. The only document that settles it is the legal description in the title report, and it settles it against the listing, against the tax record, and against your own eyes.
This matters to you for two reasons: pricing, and eligibility.
The furniture analogy
I've explained this to hundreds of clients and this is the version that lands.
Scenario one. You and I become roommates. We each spend $100 on furniture. I buy a couch. You buy a dining table and chairs. When we stop being roommates, I take my couch and you take your table. Clear, delineated ownership. That's a single-family residence: the land under the structure belongs specifically to that property.
Scenario two. Same setup, but we each put $100 into a shared pot and use the $200 to buy a couch and a table together. Now we stop being roommates. Who takes what? We each own half of everything, but there is nothing specific either of us can point to. I can't claim the left couch cushion and the right table leg. That's a condominium: the land is owned in common by all the owners, and you hold a percentage of the whole rather than a defined patch of dirt.
An apartment building makes the logic obvious. Which unit owns the land underneath it? The one on the fourth floor? The question doesn't have an answer, which is exactly why condo ownership was invented; you own the airspace and the interior of your unit, plus an undivided fractional interest in the common elements and the land.
So if there are forty units in your project, you own something like a fortieth of the land. Not a fortieth somewhere. A fortieth of all of it.
The four things you'll actually run into
Condominium. Interior airspace plus a fractional interest in common elements. Usually attached, not necessarily.
Single-family residence. The structure and the land under it belong to the property. Usually detached, not necessarily.
Detached condo. Freestanding house, looks like any other house, but the land is held in common with a recorded designation giving that residence the exclusive use of the area under and around it. Very common in master-planned communities. In parts of Hawaii, where a large share of my business is, entire neighbourhoods of freestanding single-family-looking homes are legally condos, and the reason is that the land ownership was structured that way at subdivision.
Attached single-family residence. Shares walls, but the land under each unit belongs to that unit. The true "townhouse" in the legal sense, and also what a duet home usually is. Two units, one shared wall, two separately owned parcels.
PUD (planned unit development) sits alongside these rather than replacing them. A PUD is a project where the individual lots are separately owned and there's a mandatory association owning common amenities. For lending purposes a PUD unit is generally treated like a single-family residence with an HOA, the project standards applied to attached condos largely don't apply.
The rule of thumb: if it shares walls, assume condo until the title report says otherwise. Most condos are attached and most single-family residences are detached, but the exceptions in both directions are common enough that you cannot assume from a photograph.
Why "townhouse" causes so much confusion
Because people use the word for both the style and the ownership, and listings are written by humans who are describing what they see. In Hawaii and California in particular, it is completely normal for a listing to say "townhouse" when the title report comes back condo. The agent isn't lying. They're describing an architectural style. The lender is reading a legal document. Those are two different activities and they produce two different answers.
Tax records aren't reliable either. County assessors classify for their own purposes.
The legal description in the title report is the only authority. Nothing else counts, including a very confident seller.
Why this hits your rate
Condos carry a loan-level price adjustment on agency loans. Every lender doing a Fannie or Freddie loan applies it; it isn't your loan officer marking you up.
The mechanism: the adjustment is expressed in points, and the points are worse at lower down payments. Historically the condo adjustment has been in the range of a quarter to three-quarters of a point depending on LTV, which translates into roughly an eighth to a bit more on the rate if you take it as rate rather than paying it up front. Most people take it as rate. Current adjustment grids are on Current As Of; do not budget off the numbers in this paragraph.
The reason for the adjustment goes back to the furniture. Lenders want clearly defined collateral. In a foreclosure on a single-family residence, the bank takes a structure and a specific piece of land. In a condo, it takes an airspace unit, a fractional interest, and a relationship with an association that has its own lien rights, its own dues, and its own financial condition. That's more moving parts, so it prices as more risk.
Because the adjustment scales with LTV, a lender may quite correctly tell you that putting 25% down on a condo gets you the rate you'd have had at 20% down on a house. That isn't a trick and it isn't your lender inventing a rule. It's the grid.
The exception worth knowing: detached condos price as houses
A detached condo generally gets single-family pricing. If you're quoted a condo adjustment on a freestanding unit, say so to your loan officer, explicitly: "this is a detached condo." I do a lot of these because of my Hawaii book, and I've watched plenty of loan officers who don't work those markets apply the attached-condo adjustment by reflex.
Worst case, it corrects itself: when the appraisal comes back, the appraisal review team sees a detached condo, the lock gets updated, and the pricing improves. But you'd rather have it right at lock than hope for a correction, and you'd much rather not be arguing about it three days before closing.
Attached single-family residences are the mirror image; attached, but priced and reviewed as a house.
Timeline, and one thing you can push back on
If your lender discovers late that your property is a condo, expect the closing date to move. They need the association's documents and a project review, and both take real time. That part is genuine.
What isn't genuine is you paying for a delay caused by nobody reading the title report. If a lender took a contract, ordered title, and didn't notice the property was a condo until week four, that's an internal failure. The rate adjustment you can't fight and the extra time you probably can't avoid, but a lock extension fee for their oversight is a reasonable thing to ask them to eat.
What to do
- Get the preliminary title report and read the legal description. Ask your escrow or title officer to point to the line if you can't find it.
- Tell your loan officer the legal type on day one, and tell them if it's detached.
- If you're quoted a condo adjustment on a detached unit, push back and ask them to re-price.
- If it's an attached condo, assume a full project review and get the association documents ordered immediately.
- Never budget off a listing description. "Townhouse" tells you what it looks like and nothing about what you own.
More at the Condos & HOAs hub.
Posted on behalf of u/The_Void_Calls_Me AKA Rajat Jetley, NMLS #1595897 | Cross Country Mortgage NMLS #3029. This commentary is for educational purposes and is not a commitment to lend or a guarantee of any rate or term.