Presale advertising in Taichung often says “SRC steel structure”, while the register of a resale community reads “reinforced concrete”. Buyers ask: what is the difference between RC, SRC and SC, and is anything with an S better? The short answer: the three differ in the main load-bearing material in the beams and columns, not in grade. RC is reinforced concrete, SRC is a steel frame encased in reinforced concrete, and SC is pure steel. Which is appropriate depends on how tall the building is. Whether it is safe depends on design and construction.
Three points to remember: 3 common residential structures (RC, SRC, SC); the most reliable field for checking is “main building material” (主要建材) in the marked section of the building register transcript (謄本); and 2 things decide safety: the right structure for the height, and construction quality. Based on the Ministry of the Interior’s disclosure statement rules and the National Applied Research Laboratories’ seismic principles (updated 2026-09-20).
What are RC, SRC and SC? Comparison table
Cut a column open and the difference is clear. An RC column is concrete around a cage of main bars and stirrups. An SRC column has an H-section steel core with rebar tied around it and concrete poured over. An SC column is a full steel column, often a box section, with only fire-proofing outside and no concrete carrying load.
| Item | RC, reinforced concrete | SRC, steel-reinforced concrete | SC, steel |
|---|---|---|---|
| Main materials | Rebar plus concrete | Steel section plus rebar plus concrete | Steel section with fire-proofing |
| Typical floors | Low to mid-rise (industry norm about 15 floors or fewer) | Mid to high-rise (about 15–25 floors) | Very tall (about 25 floors and above) |
| Advantages | High stiffness, little sway, good sound and fire performance, lower cost | Both stiffness and ductility, can go higher | High ductility, light, fast to build |
| Disadvantages | Heavy, unsuitable for great height; walls prone to fine cracks | Most complex sequence, quality harder to control | Noticeable sway on upper floors; sound insulation needs extra design |
| Cost | Lowest | Medium to high | Highest |
| Sound and sway | Good insulation, little sway | In between | Weaker insulation, more noticeable sway |
Typical floors and pros and cons are industry consensus; each project’s structural design governs (updated 2026-09-20).
Which is better? Height and workmanship
No structure is always best. All three must meet the same seismic design code; the difference is which one makes sense at a given height. Concrete is heavy, so the taller the building the thicker the RC columns, which is why RC is used for low and mid-rise. Steel is light and ductile, so only very tall buildings need SC, and SRC is the compromise. A community of a dozen or so floors in RC is completely normal, and there is no reason to pay more for an S in the advertisement.
What really separates safe from unsafe is whether the design was done properly and construction followed the drawings: concrete strength, correctly tied stirrups, well-welded steel connections. These belong to seismic design and construction checks; see the viewing checklist and our guide to seismic ratings.
Our view: When a presale brochure says “SRC steel”, ask “how many floors?”. Above twenty-odd floors SRC is a reasonable choice; around ten floors RC is the norm. Treating the structural type as a premium feature usually means paying for peace of mind rather than safety.
Sound, sway and cost
RC feels the most solid, SC sways the most noticeably, and SRC sits in between. Cost runs the other way: SC highest, RC lowest. The reason is the material itself. Concrete is heavy and stiff, so it moves little in a quake and blocks sound. Steel is light and elastic and protects the structure by swaying to dissipate energy, so upper-floor residents feel more, but feeling it does not mean it is unsafe.
- Sound: RC floors and walls are thicker, so footsteps from above are quieter. In an SC tower, insulation depends on whether acoustic floors and light partitions were designed in.
- Sway: in the same earthquake a steel high-rise swings further and longer. That is the “flexible beats rigid” design at work.
- Cost and price: more steel means higher construction cost, reflected in the unit price. For a resale home, the total is also affected by age and the common-area ratio; use our common-area ratio guide to work out the real interior area.
How to check which structure your home has
The most reliable source is the “main building material” field in the marked section of the building register transcript, which reads “reinforced concrete”, “steel-reinforced concrete” or “steel”. Check three documents in order:
- Building register transcript. Anyone can apply at a land office or online through the Ministry of the Interior’s Department of Land Administration. Read “main building material” and “completion date” together, so you know which code version the building was designed to.
- Occupancy permit (使用執照). It shows the structural type and number of floors. For a presale project, look at the building permit instead. Ask the developer or owner for a copy.
- Property disclosure statement (不動產說明書). When buying an existing home through an agent, the Ministry requires the statement to record the main building material and completion date of registered buildings, plus any visible cracks in beams or columns and any exposed rebar. You can ask to see it before signing an offer or paying earnest money.
For presale you can also ask for the structural plan and materials description. For what to collect at each stage, see the buying process and escrow explained.
Codes you will see on older homes: SS, RB, brick
Beyond the three main types, resale transcripts often show “reinforced brick” and “steel” (advertised as SS), and older ones “brick” or “timber”.
- SS (steel structure): the same as SC under a different name, common in factory-office buildings, townhouse extensions and some early towers.
- Reinforced brick (加強磚造, RB): load-bearing brick walls confined by reinforced concrete beams and columns, common in older townhouses and four- or five-storey walk-ups. Seismic capacity is generally below RC. The key issues are extensions and whether walls have been removed or altered.
- Brick and timber: mostly 40 to 50 years old or more; loan-to-value and loan term are usually restricted, so ask the bank first.
For older homes, the pattern and location of wall cracks matter as much as the structural type; see our guide to shear cracks. To weigh old against new, see resale versus presale versus new build.
Our view: The transcript occasionally shows a mixed entry such as “reinforced concrete and reinforced brick”, meaning some floors or an extension used a different method. When you see a mixed entry, first confirm whether the extension is legally registered. That affects the mortgage and future resale more than the structural name itself.
FAQ
Is SRC always more earthquake-resistant than RC?
Not necessarily. All three must meet the same seismic code. SRC is used to build higher. A dozen-floor community in RC, properly designed and built, is no less safe than SRC.
Are RC homes less safe?
No. RC is the mainstream structure for low and mid-rise housing in Taiwan, with high stiffness, little sway and good sound insulation. What to watch is the code version matching the building’s age and the construction quality, not RC itself.
How do I check whether a home is RC or SRC?
Apply for the building register transcript and read “main building material” in the marked section. The occupancy permit also shows the structural type, and for an agented sale the disclosure statement must record it.
Can I buy an old reinforced-brick house?
Yes, but clarify the seismic assessment and mortgage terms first. Reinforced brick generally has lower seismic capacity than RC. Check for illegal extensions and removed load-bearing walls, and confirm loan-to-value and term with the bank.
Conclusion
RC, SRC and SC are three reasonable choices for different heights. None is inherently safer. Check the transcript’s main material and the building’s age first, then ask for design and construction documents. If you are unsure how to read them, contact us.