Construction and Infrastructure Disputes in Türkiye: Legal Guide for Employers, Contractors and Investors

Construction and infrastructure projects are among the most complex commercial undertakings in Türkiye. They involve capital, land, design, engineering, procurement, labour, public permits, subcontractors, financing, insurance, performance security, technical specifications and long-term commercial expectations.

A project may begin with optimism and commercial urgency. Yet the same project may later face delay, cost escalation, design changes, payment disputes, defective works, termination threats, bond calls, employer claims, contractor claims or arbitration.

Construction disputes rarely arise from one document or one event. They usually develop over time through a chain of instructions, correspondence, site records, payment certificates, delay notices, design revisions, procurement issues, employer decisions, contractor responses and technical disagreements.

For that reason, legal strategy in construction projects should begin before a dispute arises.

This guide explains key legal issues employers, contractors, subcontractors, developers, investors and international companies should consider in construction and infrastructure projects connected with Türkiye.

1. Construction Law Is Contract Management in Motion

Construction law is not limited to litigation after a project fails. It begins with contract structure and continues throughout the project lifecycle.

A well-managed construction matter requires legal attention at several stages: tender and negotiation; contract drafting; allocation of risk; design responsibility; site handover; permits and approvals; procurement; subcontracting; project administration; notices and correspondence; payment certification; variations; extension of time claims; delay analysis; defects and completion; termination; bond and guarantee issues; dispute boards; and mediation, litigation or arbitration.

The contract is not a document to be signed and archived. It is the operating system of the project. If project teams do not understand the contract, legal rights may be lost before lawyers are instructed.

2. Choosing the Right Contract Structure

The first legal question is not the contract price. It is the contract structure. Different projects require different contractual models.

Common structures include employer-designed construction contracts, design-build contracts, EPC or turnkey contracts, construction management structures, cost-plus arrangements, unit-price contracts, lump-sum contracts, framework agreements, public procurement contracts, subcontract packages, supply and installation contracts, and operation and maintenance arrangements.

Each structure allocates risk differently. For example, in an employer-designed project, the employer may retain more design responsibility. In a design-build or EPC structure, the contractor may assume more responsibility for design, coordination and performance.

A project owner may prefer certainty of price and completion. A contractor may require clarity on site conditions, employer risks, variation mechanisms and delay events. A contract that does not match the real project structure will create disputes.

3. FIDIC Contracts and International Projects

In international construction and infrastructure projects, FIDIC forms are frequently used or adapted. FIDIC contracts provide familiar structures for employer-designed works, design-build projects and EPC/turnkey arrangements. They are often used in projects involving international contractors, lenders, consultants or public infrastructure.

However, using a FIDIC form does not automatically create a balanced or suitable contract.

Parties should carefully review the particular conditions, governing law, language, role of the Engineer, notices, claims procedure, time bars, variation mechanism, extension of time, delay damages, payment certification, suspension rights, termination rights, dispute board provisions, arbitration clause, bonds and guarantees, force majeure or exceptional events, and local mandatory law issues.

The greatest risk in FIDIC-based contracts often lies not in the standard form, but in the amendments. A heavily amended FIDIC contract may appear familiar but allocate risk in a way that is materially different from the standard structure.

4. Scope of Works and Technical Specifications

Many construction disputes begin with uncertainty over scope. The parties may disagree on whether a task, material, technical standard, design revision or coordination obligation is included in the original contract price.

A strong contract should define the scope of works, design documents, drawings, specifications, employer's requirements, contractor's proposals, bills of quantities, hierarchy of documents, performance standards, testing requirements, commissioning obligations, handover deliverables, operation manuals, training obligations and as-built documents.

Document hierarchy is particularly important. If drawings, specifications, schedules and employer requirements conflict, the contract should say which document prevails. Without a clear hierarchy, technical disagreement may become a legal dispute.

5. Site Conditions and Ground Risk

Site conditions can significantly affect time and cost. Unexpected ground conditions, contamination, underground utilities, access limitations, archaeological findings, neighbouring property restrictions or incomplete site data can disrupt the project.

The contract should address who investigated the site, what information was provided, whether the contractor relied on employer data, whether site conditions are contractor risk, what qualifies as unforeseeable, notice requirements, entitlement to time or cost, and the evidence required for claims.

Contractors should avoid accepting broad site-risk clauses without proper investigation. Employers should avoid vague site information that later creates uncertainty. A well-drafted site condition clause reduces the likelihood of expensive factual disputes.

6. Time for Completion and Programme Management

Time is central to construction projects. The contract should specify the commencement date, time for completion, sectional completion, milestones, programme submission, programme updates, critical path, float ownership, delay notice requirements, extension of time procedure, delay damages, concurrent delay treatment, acceleration, suspension and taking-over.

The programme should not be treated as a mere planning document. It may become important evidence in a delay dispute.

A contractor seeking an extension of time should maintain records showing planned activities, actual progress, delay events, affected activities, causation, mitigation measures and revised completion dates. An employer seeking delay damages should also maintain records showing the contractor's responsibility for delay and the contractual basis for the claim.

Delay disputes are document-intensive. Site diaries, meeting minutes, correspondence, photographs, procurement logs and programme updates may determine the outcome.

7. Extension of Time Claims

Extension of time claims arise when the contractor argues that completion has been delayed by events for which the contractor is not responsible.

Potential grounds may include employer delay, late site handover, design changes, delayed approvals, variations, force majeure or exceptional events, authority delays, unforeseen site conditions, suspension instructed by the employer, delayed access, late materials supplied by the employer and adverse weather if contractually relevant.

A successful extension of time claim usually requires timely notice, identification of the delay event, explanation of causation, impact on the critical path, supporting records, updated programme analysis and mitigation evidence.

A weak claim merely states that the project was delayed. A strong claim explains why, how, when and with what contractual consequence.

8. Delay Damages and Employer Claims

Employers may claim delay damages if the contractor fails to complete on time and no valid extension of time applies. Delay damages provisions should be drafted carefully.

They should address the amount or calculation method, the daily or weekly rate, any cap, sectional completion, the relationship with actual loss, notice requirements, deduction from payments, bond interaction and termination interaction.

Contractors should examine whether delay damages are enforceable under the applicable contract and law, and whether the employer contributed to delay. Employers should ensure that claims for delay damages are administered consistently with contract requirements.

Delay damages are often negotiated heavily because they can become one of the largest financial exposures in a project.

9. Variations and Change Orders

Changes are common in construction projects. A variation may involve additional works, omission of works, design change, change in quality, change in sequence, change in method, an acceleration instruction, a revised technical specification, a change in site access or an authority-driven change.

The contract should define who may instruct variations, whether oral instructions are valid, how variation price is calculated, whether time impact is assessed, whether contractor consent is required, when notice must be given, how disputed variations are recorded and whether work must proceed pending valuation.

Uncontrolled variation management is one of the main causes of construction disputes. Contractors should avoid performing additional work without written instruction or proper notice. Employers should avoid informal site directions that later become costly claims.

10. Payment Claims and Interim Certificates

Payment disputes are common because construction projects involve cash-flow pressure. Issues may arise over interim payment applications, certification, measurement, valuation of variations, deductions, retention, advance payment, set-off, delayed payment, price escalation, currency changes, taxes and the final account.

The contract should clearly define the payment application dates, supporting documents, certification timeline, due date for payment, consequences of non-payment, right to suspend, dispute process and final account procedure.

Contractors depend on cash flow to perform. Employers need confidence that payment corresponds to actual progress and contractual entitlement. A good payment mechanism protects both sides by creating predictable administration.

11. Price Escalation and Economic Imbalance

Construction projects may be affected by inflation, currency volatility, supply-chain disruption and material price increases. These issues are particularly important in long-duration projects.

The contract should address whether price adjustment is available and, if so, which cost categories are covered, the indexation formula, the currency, the base date, excluded items, documentation, notice requirements, employer approval, and any caps or thresholds.

If the contract is silent, parties may face difficult disputes over whether economic hardship, impossibility, adaptation or other legal doctrines apply. In high-value projects, price escalation should not be left to assumptions.

12. Subcontractors and Supply Chain Risk

Main contractors often rely heavily on subcontractors and suppliers. Subcontract risk may include delayed performance, defective work, insolvency, lack of coordination, health and safety failures, unpaid subcontractor claims, interface disputes, back-to-back obligations, design responsibility, warranty gaps, materials delay and imported equipment problems.

The main contract and subcontracts should be aligned. Key issues include flow-down obligations, payment timing, variation procedure, delay claims, design responsibility, insurance, indemnities, dispute resolution, termination, document control, confidentiality, site rules and handover deliverables.

A contractor may face liability to the employer even when the root cause lies with a subcontractor. Subcontract drafting should therefore be treated as part of project risk management, not administrative procurement.

13. Bonds, Guarantees and Securities

Construction contracts frequently require financial security. Common forms include bid bonds, performance bonds, advance payment bonds, retention bonds, parent company guarantees, bank guarantees, letters of credit and collateral warranties.

Bond disputes may arise when the employer calls the bond and the contractor argues that the call is abusive, premature or inconsistent with the contract.

Parties should review the on-demand or conditional nature, expiry date, extension obligations, call requirements, governing law, forum for disputes, relationship with the underlying contract, fraud or abuse exceptions, bank procedures and injunction possibilities.

A bond is not a minor appendix. It can determine financial leverage during a dispute.

14. Defects, Warranty and Taking-Over

Completion does not necessarily end the parties' obligations. Defects may arise before or after taking-over.

The contract should define the completion requirements, tests on completion, taking-over certificate, punch list, defects notification period, contractor's obligation to remedy, employer's right to repair, cost recovery, latent defects, warranty documentation, operation and maintenance manuals and performance testing.

A defect dispute may involve technical questions such as design adequacy, workmanship, material quality, misuse, maintenance, causation and cost of repair. Employers should document defects carefully. Contractors should respond in accordance with the contract and avoid informal admissions that may expand liability.

15. Termination of Construction Contracts

Termination is one of the most serious steps in a construction project. It may arise due to contractor default, employer non-payment, prolonged suspension, insolvency, abandonment of works, failure to proceed, serious breach, force majeure or exceptional event, convenience termination, or corruption or compliance breach.

Before termination, the party considering termination should review the contractual grounds, notice requirements, cure periods, evidence, consequences of wrongful termination, site possession, materials and equipment, subcontractors, bonds, payment accounts, intellectual property, insurance and dispute resolution.

Wrongful termination can create significant damages exposure. A termination decision should therefore be prepared with legal and technical support.

16. Public Procurement and Public Works

Construction projects involving public authorities may be subject to public procurement rules and specific contract regimes. Public works can involve tender procedures, qualification criteria, bid securities, administrative specifications, contract securities, strict documentation, time extensions, price difference rules, penalties, acceptance procedures, audit mechanisms and administrative remedies.

Companies participating in public procurement should treat the tender documents as a legal framework, not merely a commercial opportunity. Failure to comply with procedural requirements can result in disqualification, loss of security, contractual penalties or future restrictions.

Public procurement disputes may also require rapid action because objection and review periods can be short.

17. Permits, Zoning and Regulatory Issues

Construction projects often depend on administrative approvals. These may include zoning status, building permits, occupancy permits, environmental approvals, heritage or conservation approvals, fire safety approvals, utility connections, workplace opening licences, municipal permissions, road access permissions and energy or infrastructure approvals.

Regulatory delay can affect project completion and financing. Parties should define who is responsible for obtaining each permit and what happens if approval is delayed or refused.

Where an investor acquires a project company or land for development, legal due diligence should include zoning, permits, title, encumbrances and administrative status.

18. Insurance in Construction Projects

Insurance is a key risk-management tool in construction. Relevant policies may include construction all risks insurance, erection all risks insurance, third-party liability insurance, employer's liability insurance, professional indemnity insurance, design liability insurance, marine cargo insurance, delay in start-up insurance, and machinery and equipment insurance.

Parties should review who obtains insurance, the insured parties, coverage limits, deductibles, exclusions, claims procedure, insurer notification, subrogation waivers, the policy period and the interface with indemnities.

Insurance does not replace contractual risk allocation. It should support it. A contract may allocate liability in one direction while the insurance programme fails to cover the relevant risk. That gap can become very expensive.

19. Record-Keeping and Evidence

Construction disputes are won or lost on records. Useful records may include contract documents, programmes, site diaries, progress reports, meeting minutes, correspondence, notices, photographs, drone footage, inspection reports, test results, delivery records, procurement logs, labour and equipment records, weather data, payment applications, certificates, variation instructions, design submissions, approval logs and defect lists.

A party that cannot prove what happened on site may struggle even if it is commercially right. Project teams should be trained to preserve evidence in real time.

Good record-keeping is not adversarial. It is professional project administration.

20. Dispute Boards, Mediation, Litigation and Arbitration

Construction disputes may be resolved through different mechanisms. Possible routes include negotiation, engineer determination, dispute adjudication or avoidance boards, mediation, expert determination, the Turkish courts, domestic arbitration and international arbitration.

The correct route depends on the contract clause, project value, technical complexity, parties' nationalities, location of assets, need for interim relief, confidentiality, enforcement strategy, urgency and the relationship between the parties.

International construction contracts often prefer arbitration because of confidentiality, technical flexibility and enforceability. However, arbitration requires careful drafting and disciplined evidence preparation.

Court proceedings may be appropriate in local projects, debt collection, injunctions, bond disputes or cases where third parties are involved. Mediation may be useful where the project is ongoing and commercial relationships must be preserved.

21. Common Causes of Construction Disputes

The most common causes include unclear scope, incomplete design, late site handover, employer delay, contractor underperformance, delayed approvals, uncontrolled variations, payment delays, defective work, poor record-keeping, an unrealistic programme, price escalation, subcontractor failure, permit delays, bond calls, termination threats, weak contract administration, informal instructions and the lack of legal review during the project.

Most construction disputes are not sudden. They accumulate. A party that manages notices, documents and contractual procedure throughout the project will usually be better positioned if the dispute escalates.

22. Practical Checklist for Employers

Employers should consider:

1. Is the contract structure suitable for the project?
2. Are employer requirements complete?
3. Is design responsibility clear?
4. Are milestones realistic?
5. Is the payment mechanism clear?
6. Are variation procedures workable?
7. Are delay damages properly drafted?
8. Are bonds and guarantees enforceable?
9. Are permits and approvals allocated?
10. Is insurance aligned with risk allocation?
11. Are subcontractor risks controlled?
12. Are site records preserved?
13. Are notices administered properly?
14. Is there a dispute escalation mechanism?
15. Is the termination procedure clear?
16. Are technical and legal teams coordinated?

23. Practical Checklist for Contractors

Contractors should consider:

1. Have site conditions been reviewed?
2. Is the scope clearly priced?
3. Are exclusions stated?
4. Is design responsibility understood?
5. Are time bars and notice requirements tracked?
6. Is the programme realistic?
7. Are delay events documented?
8. Are variations instructed in writing?
9. Are payment applications supported?
10. Are subcontract obligations back-to-back?
11. Are price escalation risks addressed?
12. Are bonds and guarantees acceptable?
13. Are employer risks preserved?
14. Is evidence collected daily?
15. Is suspension or termination risk managed?
16. Is dispute strategy considered before escalation?

Frequently Asked Questions

What are the main causes of construction disputes in Türkiye?

Common causes include delay, payment disputes, variations, defective works, unclear scope, price escalation, site conditions, termination, bond calls and poor contract administration.

Are FIDIC contracts used in Türkiye?

FIDIC-based contracts may be used in international and major construction projects involving Türkiye, particularly where foreign contractors, investors, lenders or consultants are involved. However, particular conditions and Turkish law issues should be reviewed carefully.

What should a contractor do when delayed by the employer?

The contractor should review the contract, issue timely notices, preserve evidence, update the programme, document causation and submit an extension of time claim in accordance with the contractual procedure.

Can an employer call a performance bond?

This depends on the bond wording, contract terms, governing law and circumstances. Contractors should review whether the call is consistent with the underlying contract and whether any urgent legal remedy is available.

Is arbitration suitable for construction disputes?

Arbitration can be suitable for complex, technical and international construction disputes. However, the arbitration clause, seat, institution, language, interim relief and enforcement strategy should be carefully drafted.

Should construction disputes be managed during the project?

Yes. Waiting until the end of the project can weaken the legal position. Notices, records, payment documents, programmes and correspondence should be managed from the beginning.

Conclusion

Construction and infrastructure projects succeed when commercial ambition is supported by disciplined contract management.

The legal risks are not limited to final disputes. They arise in scope definition, design responsibility, site conditions, programme management, variations, payment, bonds, defects, permits, insurance, termination and evidence.

For employers, the priority is to maintain control, ensure performance and preserve remedies. For contractors, the priority is to protect entitlement, preserve cash flow, document delay and avoid uncompensated risk.

A strong construction legal strategy is built before the dispute becomes visible. It requires clear contracts, timely notices, disciplined records, technical coordination and an understanding of how each project decision may later be read by a court, tribunal, expert or opposing party.

How Terziolu & Partners Can Assist

Terziolu & Partners advises businesses, investors, developers, contractors and private clients on commercial, construction, real estate and dispute-related matters involving Türkiye and cross-border projects. Our work may include reviewing construction and infrastructure contracts; advising on FIDIC-based structures; drafting and negotiating project agreements; advising on delay, variation and payment claims; supporting employers and contractors during project execution; reviewing bonds, guarantees and securities; advising on termination and suspension; assisting with construction-related insurance issues; supporting mediation, litigation and arbitration; and coordinating with technical experts, engineers, quantity surveyors and international counsel where required.

Discuss a construction, infrastructure or project dispute with our team.

This article is provided for general informational purposes only and does not constitute legal advice. Construction and infrastructure disputes may vary significantly depending on the contract, governing law, project documents, technical records, parties, public procurement rules, permits, notices, evidence and timing of advice. No action should be taken or withheld solely on the basis of this publication. Specific legal, technical and commercial advice should be obtained before signing, terminating, suspending, claiming, paying, withholding payment, calling a bond or commencing proceedings in relation to a construction project. Submission of an enquiry to Terziolu & Partners does not create a lawyer-client relationship unless and until the engagement is formally accepted in writing.