What Is a CBS Home in Florida? Concrete Block vs. Wood Frame Construction

What is a CBS home in Florida? It is a house whose outside walls are built from concrete block and then coated in stucco. CBS stands for concrete block and stucco, and you will see the letters on almost every South Florida listing. So if you are moving here from a state where homes are framed in wood, the term can be confusing at first. This guide explains how CBS walls are built, how they compare with wood frame, what they mean for hurricanes and insurance, and what to check before you buy or sell one.

Key takeaways

• CBS means concrete block and stucco. It describes the exterior walls only. Most CBS homes still have a wood roof frame.
• Florida adopted one statewide building code on March 1, 2002, after Hurricane Andrew exposed weak local codes. The permit date matters as much as the wall type.
• Florida's wind mitigation form looks at the roof, the roof-to-wall connection and the window and door protection. It does not grade the walls, so a CBS label alone does not earn a discount.
• Citizens requires a four-point inspection on homes more than 20 years old. That covers the roof, electrical, plumbing and HVAC, whatever the walls are made of.
• You can confirm wall type on the Property Appraiser record, in the attic, or by checking how deep the windows sit in the wall.

What is a CBS home in Florida, in plain terms

A CBS home has exterior walls made of hollow concrete blocks, often called CMUs. The builder stacks the blocks with mortar, then fills certain cells with steel bars and grout. Next, a poured concrete tie beam runs along the top of the walls. Finally, the outside gets a coat of stucco, which gives the smooth or textured finish you see from the street.

The term covers the walls, not the whole house. In fact, many CBS homes still use wood roof trusses and wood or metal studs for inside walls. So a "CBS home" in Florida is really a block-walled house with a framed roof on top.

You will see the label in several places. MLS listings often show "CBS" or "Block" under construction type. The Palm Beach County Property Appraiser record lists the exterior wall material too. Inspectors and insurers also ask about it, because the wall type affects how the house is rated.

What a CBS home in Florida looks like next to wood frame

A wood frame house uses lumber studs for the outer walls. The builder then covers the frame with sheathing and a finish, such as siding, brick veneer or stucco. That last option is where buyers get tripped up, because a stucco wood frame home can look almost the same as a CBS home from the curb.

Here is how the two usually differ:

• Wall thickness. A concrete block wall runs about 10 inches thick once you add the finishes. A framed wall is usually thinner.
• Sound. Stucco over block feels like solid rock when you knock on it. Stucco over wood frame can sound a little hollow.
• Window depth. Windows set in block walls tend to sit about 3 inches back from the outside face. In framed walls they sit closer to the surface.
• Termites. Termites cannot eat concrete block. However, they can still reach wood trusses, door frames, cabinets and trim, so a CBS home still needs termite checks.
• Moisture. Block walls hold up well to wind-driven rain. Even so, cracks in stucco can let water in, so the finish needs regular care.

So what is a CBS home in Florida worth compared with a framed one? Neither type is "good" or "bad" by default. A well-built frame house to the current code can outperform an older block house with a weak roof. That is why the permit date and the roof matter so much.

Why CBS homes are so common in South Florida

Block construction has long been the norm in Palm Beach County, from older ranch homes in Lake Worth Beach to newer houses in Jupiter and Boca Raton. Block resists wind and wind-borne debris well. It also stands up to termites and humid air better than bare lumber. As a result, builders and buyers here have favored it for decades.

Then came Hurricane Andrew. The storm hit South Florida in August 1992 as a Category 5 and caused about $27 billion in damage, according to the International Code Council. It also showed that Florida's patchwork of local codes did not work. So the state built a single code. The first Florida Building Code took effect on March 1, 2002, and it replaced the local codes across the state.

The code has been updated many times since. According to the ICC, the Florida Building Code is credited with cutting windstorm losses by up to 72 percent. For a buyer, the lesson is simple. A CBS home permitted after 2002 was built under far stricter wind rules than one from the 1970s, even though both say "CBS" on the listing.

Hurricanes: what a CBS home in Florida can handle

Block walls are strong, but a house fails at its weakest point. In most storms, that point is the roof or an opening, not the wall. For example, if a window or garage door fails, wind can rush inside and push up on the roof from below. Once that happens, the roof deck or the roof-to-wall connection can give way.

So when you judge a CBS home, look past the walls. Ask these questions instead:

• How old is the roof, and what is it made of?
• Is the roof deck nailed down with the right spacing?
• How is the roof tied to the walls: toe nails, clips or straps?
• Are all windows, doors and the garage door impact-rated, or is there shutter protection?
• Was the home permitted before or after the first statewide code in 2002?

A block home with a new roof, strong straps and impact glass is well prepared for wind. On the other hand, a block home with an old roof and no shutters is not, despite its solid walls.

What insurers look at on a CBS home in Florida

Insurers do ask about wall type. Even so, the bigger savings in Florida usually come from wind mitigation features. Florida uses one state form for this, the Uniform Mitigation Verification Inspection Form, OIR-B1-1802. The latest version is Rev. 04/26.

The form covers these items:

1. Building code in force when the permit was filed
2. Wind speed region
3. Roof slope
4. Roof covering
5. Deck attachment
6. Roof-to-wall attachment
7. Roof geometry, such as hip or gable
8. Secondary water resistance or a sealed roof deck
9. Opening protection for windows, doors and skylights

Notice what is missing: wall type. So a CBS label alone does not earn a wind mitigation credit. Also, opening protection is all or nothing. One unprotected window or garage door can cost you that credit.

Age matters as well. Citizens Property Insurance requires a four-point inspection for homes more than 20 years old. That inspection reports the age, type and condition of the roof, electrical, plumbing and HVAC. Citizens also wants proof of at least five years of remaining life on shingle roofs older than 25 years and on tile or metal roofs older than 50 years. For more on cost, see our guide to Florida hurricane insurance.

What inspectors check on a CBS home in Florida

A general home inspection covers the whole house. But on a block home, a good inspector pays extra attention to a few areas.

Stucco cracks and water entry

Small hairline cracks are common and often cosmetic. Wider cracks, stair-step cracks along the block joints, or cracks near windows can point to settling or water entry. Rust stains on stucco can mean water has reached the steel inside the wall, so an inspector may suggest a closer look.

The attic and the top of the wall

The attic is where an inspector can see the top of the wall, the tie beam and the roof-to-wall connections. In fact, this is the only sure way to confirm a home is block and not framed. It is also where the wind mitigation inspector checks the straps or clips.

Windows, doors and the garage door

Next, the inspector looks for impact ratings, shutter tracks and product labels. Missing labels can make it hard to prove protection on the wind form.

Wood parts of a block house

Finally, wood trusses, fascia, soffits and door frames can still have termite or water damage. A wood-destroying organism report is a smart add-on. For cost ranges, read our guide on home inspection cost in Florida.

How to confirm a home is CBS before you buy

Once you know what a CBS home in Florida is, the next step is proving a listing is one. Listings are not always right, so verify the wall type yourself. Here are four quick ways to do it:

• Check the Property Appraiser record. In Palm Beach County, the record lists the exterior wall material. Martin and St. Lucie counties keep similar records for Hobe Sound and Port St. Lucie.
• Knock on the wall. Block feels solid. Framed walls with stucco can sound a bit hollow.
• Look at the windows. Deeper window returns usually point to block.
• Ask the inspector to check the attic. Seeing the top of the wall settles the question.

Some homes mix both types. For instance, a block first floor may carry a framed second floor, and additions are sometimes framed. In those cases, ask which parts are block and how the insurer will rate the house.

Selling a CBS home in Florida: what to put in your listing

If you are selling, CBS construction is a plus worth stating clearly. Out-of-state buyers often search for it. Still, it works best when you back it up with records. So gather these before you list:

• A current wind mitigation report on form OIR-B1-1802
• A four-point report if the home is more than 20 years old
• Roof permit dates and any impact window or shutter permits
• Product approval labels or invoices for windows and doors

With these in hand, a buyer can get insurance quotes early. That cuts the risk of a deal falling apart late in the inspection period. It also helps your agent price the home against nearby sales with similar features. If you want to know what your house could sell for, start with a free home value report.

Frequently asked questions

What does CBS stand for on a Florida home listing?

CBS stands for concrete block and stucco. It means the outside walls are built from concrete block and finished with stucco. It does not describe the roof, which is often wood framed.

Is a CBS home in Florida better than wood frame?

Block walls resist wind, debris and termites well. However, a home's real storm strength depends more on the roof, the roof-to-wall connection and the window protection. A newer frame home built to the current code can outperform an older block home.

Does a CBS home get cheaper insurance?

It can help with how the insurer rates the house, but Florida's wind mitigation form does not grade the walls. The credits come from the roof, the connections and opening protection. Get quotes before you finish your inspection period.

Can a stucco house be wood frame?

Yes. Stucco is only a finish. A framed wall can also carry stucco, so check the Property Appraiser record, the window depth and the attic to be sure.

Do CBS homes get termites?

Termites cannot eat the block, but they can still damage wood trusses, trim, door frames and cabinets. So plan on routine termite inspections for a block house too.

Sources

• International Code Council, Florida case study
• Simpson Strong-Tie, OIR-B1-1802 Rev. 04/26 overview
• Citizens Property Insurance, inspection requirements
• How To Look At A House, telling block from frame

Selling a block home in Palm Beach County? Pure Equity can price it against recent sales and help you pull the wind and four-point reports buyers ask for. Start with a free home valuation. Shopping for a CBS home instead? Ask our team to set up new-listing alerts for the areas you want.