Offices and mixed-use buildings
Open-plan floors with long spans and service zones between beams.
Project types · Multi-storey steel buildings
Multi-storey steel frames: lighter, faster, cleaner sites
Offices, schools and campuses, dormitories, hotels, hospitals and mixed-use buildings. Steel columns and beams with composite floors, engineered by our team, fabricated in our own factory and erected floor by floor.
2018delivering steel structures to Thailand
Omakasemulti-level car park building in Thailand
EXC3EN 1090 execution class for welded steel
2,500 Tfabrication capacity every month
Building up in Thailand
Steel takes weight off your foundations and months off your programme
Much of central Thailand sits on soft clay, labour is getting scarcer and owners want buildings open sooner. A steel frame with composite floors weighs far less than reinforced concrete, so piles and foundations shrink, and it is fabricated in the factory while the site prepares, so floors go up in days instead of weeks.
We design braced or moment-resisting frames to Thai wind and seismic standards, coordinate fire protection and services with your architect and engineer, and fabricate every column, beam and connection in our own factory with full QC records. Our multi-storey references include schools, office towers and car parks.
- Lighter frames for smaller foundations on soft soil
- Composite floors with long, column-free spans
- Fire protection applied in the factory
- Floor-by-floor erection while lower floors are finished
Structural solutions
What we frame in multi-storey buildings
Each option is engineered member by member in our design office, then built on our own fabrication lines.
Schools, campuses and dormitories
Repetitive classroom and room grids erected during term breaks.
Hotels and serviced apartments
Steel frames for resort and city hotels, including island and coastal sites.
Car parks and podiums
Parking levels and podiums under or beside the main building.
Rooftop and vertical extensions
New floors added on existing buildings where the light weight of steel helps.
Braced cores and frames
Steel cores and bracing for stability under Thai wind and seismic loads.
Your challenges, our answers
What developers and designers ask us, and how we solve it
The questions we hear most often from Thai owners, designers and contractors.
Challenge 01
Soft soil and expensive piles
Our answer
A steel frame is much lighter than concrete, reducing piles and foundations.
Challenge 02
Labour shortage on site
Our answer
Most of the work happens in our factory; site crews bolt pieces together.
Challenge 03
Fire safety rules
Our answer
Intumescent protection is applied in our factory to the rating required for each member.
Challenge 04
Floor vibration and comfort
Our answer
Composite floors are checked for deflection and vibration for offices, classrooms and hotels.
Challenge 05
Coordination with MEP
Our answer
Beam openings and service routes are agreed before fabrication.
Challenge 06
Opening date for the school year or season
Our answer
Fabrication runs in parallel with foundations, and erection follows a floor-by-floor plan.
Inside the structure
Typical design ranges for multi-storey steel buildings
Every project is engineered to its own brief and site. These are the ranges we work in most often.
| Design item | Typical range we engineer |
|---|---|
| Storeys | Typically 2–10 storeys; more with braced cores |
| Floor spans | 8–15 m with composite beams |
| Floors | Composite deck, precast hollow-core or steel deck with topping |
| Stability | Braced frames, moment frames or steel cores |
| Fire protection | Intumescent paint or boards to the required rating |
| Seismic | DPT 1301/1302-61 for northern and western provinces and Bangkok basin |
| Wind | DPT 1311-50 for your province and building height |
Design highlights
- 01
Light frame
Smaller foundations on Thai soft clay.
- 02
Factory-protected steel
Paint and fire protection applied before shipping.
- 03
Floor-by-floor
Erection sequenced with deck and services.
- 04
Full traceability
Material certificates and weld records for every member.
Designed and made by World Steel
From our design office to your Thai port, in one company
Your structure is not bought from a trader or subcontracted: it is engineered by our team and fabricated, inspected, painted and packed in the World Steel factory.
World Steel factory · Tay Ninh, Vietnam20,000 m² · 2,500 T/monthISO 9001 · ISO 3834-2 · EN 1090 EXC3 · AS/NZS 5131 CC3 · IAS AC472
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01Designed by our own engineers
World Steel structural engineers calculate to Thai and international codes and produce the Tekla 3D model, approval drawings and every shop drawing. Nothing is outsourced.
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02CNC cutting and drilling
Plates and sections cut by plasma, laser and CNC drilling lines straight from the model, with first-piece inspection before the batch runs.
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03Built-up members welded in-house
Submerged-arc welding lines and qualified welders make columns and rafters to ISO 3834-2 and EN 1090 EXC3.
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04Inspected before it leaves
Dimensional checks, UT and MT weld testing and paint thickness readings, recorded piece by piece in the QC dossier you receive.
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05Blasted and painted in the factory
Shot blasting and an ISO 12944 paint system chosen for inland, coastal or port sites, or intumescent fire protection up to R120.
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06Packed by erection zone, shipped CIF
Every piece marked, bundled by erection zone and loaded so the first members your erector needs reach site first.
Scope of supply
What you receive, and what stays local
A clear split of work keeps your budget and schedule predictable.
World Steel designs, makes and ships
- Structural design and calculations to Thai and international codes
- Approval drawings for your Thai engineer (กว.) to review and sign
- Main steel frame, C/Z purlins, bracing and all connection bolts
- Shop painting or fire-protection paint, packing and CIF shipping
- QC dossier, erection drawings and remote technical support
Your Thai team on site
- Site survey, soil investigation and foundations
- Building permit with the local authority or IEAT
- Unloading at site and erection by your contractor or our partners
- Roof and wall sheeting, doors and MEP (or sourced in Thailand)
Thai codes and standards
Designed to pass Thai permitting
Building Control Act B.E. 2522
Construction permit from the local authority, or IEAT inside an industrial estate; we prepare the structural drawings and calculations.
DPT 1311-50 · DPT 1301/1302-61
Thai wind and seismic standards applied for the province of your site.
Engineering Profession Act B.E. 2542
Your licensed Thai engineer reviews and signs; we answer every comment.
Ministerial Regulations on fire resistance
Fire rating of structural members in multi-storey buildings, achieved with factory-applied intumescent paint.
DPT 1301/1302-61 seismic design
Seismic detailing for provinces in Thai seismic zones and the Bangkok basin.
Work we have delivered
Multi-storey steel buildings we have delivered
Designed, fabricated and shipped by World Steel. Projects outside Thailand are references with the same type of structure.
Flagship2022
Thailand
Omakase Car Park Building D
Car park
42023
Philippines
3 Storey College of Medicine
Multi-storey & civil building
4
2020
Vietnam
Southgate Tower
Multi-storey & civil building
2
2020
Vietnam
The Sun Tower
Multi-storey & civil building
8Projects outside Thailand are shown as references with the same type of structure.
Why World Steel
One partner from first sketch to Thai port
Exporting to Thailand since 2018
Steel buildings for manufacturers, developers and retailers across Thailand.
Our own certified factory
20,000 m² in Tay Ninh, 2,500 T a month, ISO 3834-2 and EN 1090 EXC3 welding quality.
Engineers, not traders
The team that designs your structure is the team that answers your Thai engineer and supervises fabrication.
CIF or DDP to your site
Shipped to Laem Chabang, Bangkok, Map Ta Phut or Songkhla, with documents for your customs broker.
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FAQ
Questions Thai clients ask us
Is a steel frame cheaper than concrete?
It depends on the building, but steel usually saves on foundations, site labour and time. We provide a budget so you can compare total cost, not just frame cost.
How is fire protection handled?
Intumescent paint is applied in our factory to the rating your Thai engineer specifies for each member; boards can be used where required.
How many storeys can you build?
Most projects are 2–10 storeys. Taller buildings are possible with braced steel cores and agreed fire and seismic strategies.
Can you add floors to an existing building?
Often yes, after your engineer checks the existing structure. Steel is light, which makes vertical extensions more feasible.
Do you work with our architect and engineer?
Yes. We design from the architectural drawings and coordinate with your Thai engineer, who reviews and signs.
Other project types
Steel structures for every type of building
Steel warehouses & distribution centresFactories & manufacturing plantsCold storage & food processingRetail stores & supermarketsCar parks & multi-storey buildingsAircraft hangars & wide-span buildingsMarkets & community buildingsSports halls & leisureAgriculture & agro-industryShowrooms, offices & residentialEnergy & industrial plantsMezzanines & equipment platformsCanopies, carports & walkwaysSteel & pedestrian bridgesExtensions & re-roofing frames
Planning a multi-storey building in Thailand?
Send the architectural drawings and site. We reply within one working day with a structural concept and budget.