Çelik Bina Müteahhitleri ve Üreticileri: Kim Ne Yapar

KXD Steel Technical & Project Team | Design, Detailing & Project Delivery | Published: September 2, 2026

A steel building manufacturer designs, details and fabricates the structure. A contractor builds on site: foundations, erection, cladding installation and trade coordination. On export projects these are separate companies in separate countries, and the boundary between them is where cost and liability leak.

Scope descriptions below reflect common export-project practice and KXD product-page data current as of August 2026. Actual responsibility is set by your contract, not by industry convention, and this article is not legal advice.

Four roles, often only two contracts

Behind the two words in most conversations sit four distinct functions.

The design engineer performs structural calculation and produces the analysis model, stamped against a design code. On export projects this is frequently the manufacturer’s in-house team, though a local engineer may be required for permit approval.

The manufacturer (fabricator) converts the design into shop drawings, procures steel, cuts, welds, coats and inspects components, then marks and packs them for shipment.

The erector receives components on site, lifts and bolts the frame, installs purlins, bracing and cladding. This is site labour with lifting equipment, and on export projects it is almost always local.

The general contractor runs the site: foundations, floor slab, utilities, permits, sequencing and coordination between trades. Sometimes the erector is a subcontractor to them. Sometimes the buyer holds both contracts directly.

The confusion comes from firms occupying more than one role. A local company might fabricate and erect. An importer might buy steel and subcontract erection. The word “contractor” covers all of it.

The responsibility matrix

This is the table to bring to your next supplier call.

Read the “Buyer” column carefully. It is longer than most buyers expect, and the rows marked as buyer-owned accuracy are the ones that generate disputes nobody planned for.

Where the scopes overlap, and you pay twice

Overlap is expensive because it is invisible. Both parties price the work, and you approve both prices.

Structural design. The manufacturer designs the frame. A local engineer engaged for permit review sometimes redesigns rather than reviews, particularly where the local authority requires a stamp from a locally licensed engineer. Decide upfront whether the local engineer is checking or designing, and price accordingly.

Detailing. Shop drawings come from the manufacturer, generated from the analysis model through Tekla, PKPM or 3D3S. A contractor quoting “shop drawings” as a line item is either duplicating this or referring to erection drawings, which are a different deliverable. Ask which.

Project management. A contractor’s PM fee often covers coordination with the steel supplier. If you are contracting the manufacturer directly and also paying a PM fee for supplier coordination, one of those is redundant.

Anchor bolts. The manufacturer typically supplies the layout and often the bolts themselves. Contractors routinely include anchor bolts in their foundation package. Two sets arrive; one gets scrapped.

Erection supervision. Both parties may offer it. Only one is needed, and the more useful question is which one has read your shop drawings.

Where the gaps open, and nobody owns the problem

Gaps cost more than overlaps, because they surface mid-project.

The anchor bolt interface is the classic one. The manufacturer issues a layout. The contractor casts bolts from it. Nobody is explicitly responsible for surveying the cast bolts against the layout before steel arrives. When positions are out of tolerance, the discovery happens with a crane on standby, and the correction requires engineering approval from a party who is 8,000 km away and may not respond the same day.

Three other frequent gaps:

• Unloading and staging. Containers arrive on a schedule set by shipping, not by erection. Who receives them, where components are stored, and whether the storage sequence matches the erection sequence.
• Fit-up correction. When a member does not fit, cause determines liability, but only if the contract says how cause is determined and who pays while it is being determined.
• Coating damage in transit and handling. Touch-up is cheap. Arguing about who pays for it is not.

Compared with directory listings that sort firms by trade label, none of this is visible from a company profile. A firm’s category tells you nothing about which of these rows it will accept.

Three contracting models

The first model is the most common on export steel projects, and it is the one that requires the most contract discipline from the buyer, because the buyer is the interface.

What the manufacturer’s scope actually delivers

The product side of the boundary, before configuration as a warehouse, workshop or plant building:

• Ana çerçeve: Q235B veya Q355B kaynaklı H-profil
• Net açıklık: tek açıklıkta 100 m'ye kadar
• Bina yüksekliği: 3–30 m
• Çatı eğimi: 1:10 ile 1:5 arası
• Rüzgar direnci: 160 km/s'ye kadar, yerel yönetmeliğe göre özelleştirilebilir
• Kaplama: tek katmanlı çelik, EPS, PU, taş yünü veya cam yünü
• Tasarım ömrü: 50+ yıl
• Minimum sipariş: 600 m²
• Yayınlanan tedarik kapasitesi: 8.000 ton/ay
• Yayımlanan fiyat aralığı: teknik özelliklere bağlı olarak 40–100 USD/m²
• Design codes available: GB, ASTM, AISI, JIS, BS, DIN, EN

Alongside the physical scope sits the document set, which is the part buyers forget to contract for: shop and erection drawings, mill certificates, welding and NDT records, coating records, packing list matched to piece marks, and export documentation. Name these as deliverables. A technical file requested at shipping arrives late or incomplete.

KXD’s stated scope covers engineering through fabrication, export and on-site erection support. Support is the operative word. For most destinations the erection contractor is local, and the manufacturer’s role is drawings, guidance and in some contracts a supervisor.

Whose certificate matters for what

Certificates attach to parties, not to buildings, and buyers frequently ask the wrong party for the wrong document.

The European Commission states that CE marking for construction products indicates conformity with declared performance assessed under a harmonised European standard or European Technical Assessment, with Commission material specifically referencing EN 1090 for structural products. EN 1090 covers execution of steel structures and factory production control, which means it belongs to the fabricator, not the erector or the general contractor. For a European destination, this is the certificate that gets checked at permit stage.

ISO identifies ISO 9001 as its quality-management-system standard, ISO 14001 as its environmental-management-system standard, and ISO 45001 as its occupational health and safety management-system standard. These certify how a company is managed. A contractor can hold ISO 9001 and still have no capability relevant to steel fabrication.

Kuzey Amerika projeleri için, American Institute of Steel Construction (AISC) karmaşık kaplama onayları da dahil olmak üzere imalatçı sertifikasyonu için referans kuruluştur.

WPQR — welding procedure qualification records — is fabricator-specific and thickness-specific. If site welding is in scope, the erector’s welder qualifications are a separate question from the factory’s WPQR, and one does not substitute for the other.

Third-party inspection through SGS, Bureau Veritas or Intertek is available on request. Reports are generated per project, so any report presented should reference your order.

Contract language that fixes the boundary

Six items to settle in writing before steel is ordered:

• A scope matrix as a contract annex. Take the table above, mark every row with a party name, and attach it. Rows nobody claims are the rows to negotiate now.
• Anchor bolt survey named as a deliverable, with a party responsible and a date relative to first container arrival.
• Erection supervision defined: whose person, how many days, what happens if the schedule slips, and who pays for extension.
• A fit-up dispute procedure: who inspects, what evidence is used, who funds correction pending determination.
• The technical document set listed item by item, tied to a payment milestone rather than to shipment.
• Incoterm stated explicitly, along with who clears customs and who pays demurrage if clearance is delayed.

None of this is exotic. It is the difference between a project where problems have owners and one where they have arguments.

The mistake underneath most of these

Buyers select parties by category and then discover scope. The sequence should run the other way: define the scope matrix first, then find parties to fill the rows.

Selecting a supplier because they are “a manufacturer” or “a contractor” imports an assumption about what they do. The assumption is usually wrong in at least three rows, and the rows where it is wrong are not discovered until money has been committed.

A related error is assuming a single point of accountability removes the interfaces. It does not. It relocates them inside someone else’s organization, prices them, and reduces your visibility into them. That can be a good trade. It should be a deliberate one.

SSS

Q: Can one company handle everything on an export project?

A: Sometimes, at a premium, and with constraints. Visas, work permits, local labour law and liability rules vary by destination, which is why erection is usually local even when everything upstream is not.

Q: If I buy directly from a manufacturer, who is my contractor?

A: You appoint one locally, or you act as your own for coordination purposes. The second option is workable, but it means the interface rows in the matrix are yours.

Q: Does the manufacturer design my foundation?

A: No. The manufacturer supplies anchor bolt layouts and column reactions. Foundation design depends on local soil conditions, so it is done by a local engineer against local geotechnical data.

Q: Who is responsible if a member does not fit on site?

A: It depends on cause — a detailing error, a fabrication deviation, an anchor bolt setting-out error, or handling damage all sit with different parties. Establish the determination procedure before shipment, because determining cause after the fact is where projects stall.

Q: Do I need a local engineer if the manufacturer has done the design?

A: Usually yes, for permit purposes. Many jurisdictions require a locally licensed engineer to stamp submissions. Clarify whether they are reviewing or redesigning, because the fee difference is substantial.

Q: Is a contractor’s ISO 9001 certificate evidence of fabrication quality?

A: It is evidence of a documented management system, not of steel fabrication capability. For fabrication, EN 1090 and WPQR are the relevant documents, and they belong to whoever fabricates.

Q: Should the erector be involved before erection starts?

A: Ideally at drawing approval. An erector reading shop drawings before fabrication catches access, sequencing and lifting problems while they are still changes on paper.