Construction Lawyers Turkey 2026: Law No.6306 Urban Transformation, Contractor Liability & Arbitration

Turkey’s urban transformation programme entered a new phase in February 2026 when the government published sweeping amendments to the implementing Regulation under Law No. 6306 on the Transformation of Areas Under Disaster Risk. For construction lawyers in Turkey, the changes sharpen retrofit obligations, tighten technical sign-off timelines and expand the circumstances in which contractors face direct civil liability for non-compliant structures. Simultaneously, intensified municipal enforcement campaigns, particularly in Istanbul, Ankara and İzmir, mean that developers and main contractors can no longer treat urban transformation compliance as a distant administrative matter.

This guide maps the new liability landscape, provides model contractual clauses for contract risk allocation, and sets out a practical arbitration strategy covering ICC, ISTAC and enforcement under the New York Convention.

Executive Summary, What Contractors Must Do Now (2026)

The February 2026 Regulation amendment demands immediate action from every contractor involved in buildings classified as risky or located in designated transformation zones. The core message is clear: compliance gaps that previously resulted in administrative warnings now trigger direct liability and accelerated demolition orders.

Immediate actions, 30 / 60 / 90 day priorities:

• Within 30 days: Audit all active projects against the updated risky-building criteria. Confirm whether any structures under contract have been flagged by municipal hazard-assessment teams or designated by the Ministry of Environment, Urbanisation and Climate Change.
• Within 60 days: Review existing construction contracts for retrofit/demolition allocation clauses, insurance adequacy and arbitration provisions. Where gaps exist, begin renegotiation or execute supplemental agreements.
• Within 90 days: Establish an internal compliance protocol, document retention schedule, notice templates for owners and insurers, and a pre-agreed escalation path to local counsel for dispute resolution.
• Ongoing: Monitor Official Gazette publications and Ministry circulars for further amendments to the Regulation, particularly those affecting seismic-risk zones.

Law No.6306 (Urban Transformation), 2026 Amendment Explained

Law No.6306 on the Transformation of Areas Under Disaster Risk was enacted to accelerate the replacement or strengthening of structures that pose a threat during earthquakes and other natural disasters. The statute empowers authorities to classify individual buildings as “risky” and to designate entire neighbourhoods as transformation zones, with mandatory participation from owners, developers and contractors.

Key Definitions: Risky Building, Owner, Contractor

Under Law No.6306 and its implementing Regulation, three definitions carry particular weight for construction lawyers in Turkey advising on compliance:

• Risky building (riskli yapı): Any structure whose useful life has expired or that has been determined, through licensed inspection, to pose a risk of life-safety failure during a disaster event. The February 2026 amendment broadened the inspection criteria to include structures that have undergone unauthorised material modifications since their original occupancy permit.
• Owner / rights-holder (hak sahibi): Every person or entity holding title or a registered right (such as a construction servitude or long-term lease) in a risky building or a building within a transformation zone. Majority-consent thresholds for transformation decisions apply to this group.
• Contractor (müteahhit): The registered contractor responsible for construction or retrofit works. The 2026 amendments clarify that registered contractors may bear direct statutory liability for structural defects identified during hazard assessments, even after delivery, where defects contributed to the risky-building classification.

New Obligations Introduced February 2026

The February 2026 Regulation amendment introduced several practical changes that alter contractors’ day-to-day obligations:

Industry observers expect these tightened timelines and expanded record-keeping duties to generate a significant increase in disputes between contractors, project owners and municipal authorities throughout 2026 and 2027.

When Is Retrofit or Demolition Mandatory, Triggers & Process

A retrofit or demolition obligation is triggered the moment a competent authority designates a building as risky or includes it within a formal transformation area. Understanding the trigger mechanism is essential for any contractor operating in Turkey’s urban-transformation environment.

Technical Documentation & Approvals

The process begins when a licensed building-inspection institution (lisanslı kuruluş) conducts a structural assessment and concludes that the building meets the statutory criteria for risk. The resulting technical report is submitted to the relevant provincial directorate of the Ministry of Environment, Urbanisation and Climate Change. Once the directorate validates the report, the building is annotated in the land registry as a risky structure, a step that restricts transfers and triggers statutory timelines for evacuation, retrofit or demolition.

Under the February 2026 amendments, the documentation requirements for this assessment now expressly cover post-construction modifications. Contractors who carried out modification works must, on request, provide as-built drawings, material specifications and structural calculations relating to their scope of work.

Who Must Pay and Sign Off

Practical Steps for Contractors Receiving a Retrofit Order

• Step 1, Preserve evidence: Immediately secure all project records, technical assessments and correspondence relating to the building.
• Step 2, Notify insurer and client: Trigger any contractual and policy notification provisions without delay; late notice risks coverage denial.
• Step 3, Assess contractual position: Determine whether the contract allocates retrofit/demolition risk and whether variation or change-order mechanisms apply.
• Step 4, Engage local counsel: Instruct construction lawyers in Turkey with specific experience in Law No.6306 proceedings to advise on compliance timelines, potential defences and dispute-resolution options.
• Step 5, Begin compliance plan: Where liability is established or likely, initiate retrofit works within the prescribed period to avoid municipal step-in and cost-recovery proceedings.

Contractor Liability Under Law No.6306, Legal Exposure & Defences

Contractor liability under Turkey’s urban transformation law operates on multiple levels: statutory, contractual and tortious. The February 2026 amendments have reinforced the statutory layer, making it essential for contractors to understand each exposure channel and plan their defences accordingly.

Statutory liability arises directly from Law No.6306 and the Turkish Code of Obligations. Where a contractor’s defective workmanship contributes to a building’s risky classification, the contractor may face claims for the cost of retrofit or demolition, consequential losses suffered by owners and occupants, and administrative penalties. The 2026 amendments strengthen the evidentiary framework by requiring contractors to maintain and disclose construction records, shifting the practical burden of proving compliance onto the contractor.

Contractual liability depends on the terms of the construction contract. Well-drafted contracts allocate retrofit obligations, cap exposure and provide clear indemnity chains. Poorly drafted contracts leave contractors exposed to uncapped claims and joint liability with project owners.

Joint and several liability with developers and subcontractors is a persistent risk under Turkish law. Authorities can pursue any party in the construction chain for costs incurred under mandatory step-in powers.

Insurance & Indemnities, What to Demand

• Contractors’ All-Risk (CAR) insurance: Confirm that the policy period extends to cover post-completion retrofit obligations triggered by Law No.6306 designations.
• Professional indemnity insurance: Essential for design-build contractors; ensure the policy responds to regulatory claims, not only third-party negligence.
• Contractual indemnities: Demand back-to-back indemnities from subcontractors mirroring the contractor’s obligations to the project owner.
• Performance bonds / guarantees: Where the contract is for retrofit works under a transformation programme, the employer may require an on-demand bond, negotiate a conditional (default) bond instead where possible.

Fault Allocation & Proving Compliance

Contract Drafting: Allocating Retrofit, Demolition & Retrofit-Risk

Effective contract risk allocation is the single most valuable step a contractor can take before commencing work on any project that may be affected by urban transformation law. The model clauses below are templates provided for illustrative purposes only, they must be adapted to each project’s specific circumstances and reviewed by qualified construction lawyers in Turkey before execution.

Price Adjustment & Variation Clauses

Model Clause 1, Regulatory Change Price Adjustment:

“Where, after the date of this Contract, any amendment to Law No.6306 or its implementing Regulation imposes obligations on the Contractor that were not reasonably foreseeable at the date of tender and that materially increase the cost of the Works, the Contractor shall be entitled to a fair adjustment of the Contract Price. The Contractor shall notify the Employer in writing within [30] days of becoming aware of the regulatory change, providing reasonable particulars of the cost impact. Failing agreement within [60] days of such notice, either party may refer the matter to determination under the dispute-resolution clause.”

Negotiation notes: Employers will resist open-ended price adjustments. Contractors should propose a cap (e.g. a percentage of Contract Price) to make the clause commercially acceptable, while preserving the right to claim beyond the cap in arbitration if the impact is disproportionate. Define “reasonably foreseeable” by reference to the Regulation text effective at the tender date.

Indemnity & Limitation of Liability Clauses

Model Clause 2, Mutual Indemnity with Fault Limitation:

“Each party (the ‘Indemnifying Party’) shall indemnify and hold harmless the other party against all losses, claims and liabilities arising from the Indemnifying Party’s negligent acts or omissions in connection with obligations under Law No.6306 and the Regulation, save that: (a) the Indemnifying Party’s aggregate liability under this clause shall not exceed [insert amount or percentage of Contract Price]; and (b) neither party shall be liable for indirect or consequential loss. This indemnity shall survive termination of this Contract.”

Negotiation notes: The critical redline is the aggregate liability cap. Contractors should insist on a financial ceiling that mirrors available insurance coverage. Employers may seek uncapped indemnities for structural defects, resist this unless the project scope and risk profile justify it, and secure corresponding back-to-back cover from subcontractors.

Performance Security & Insurance Wording

Model Clause 3, Insurance Obligation (Retrofit Projects):

“The Contractor shall procure and maintain throughout the Contract Period, and for a period of [24] months thereafter: (a) Contractors’ All-Risk insurance with a minimum limit of [insert amount] per occurrence, covering retrofit and demolition works required under Law No.6306; (b) Professional Indemnity insurance with a minimum limit of [insert amount] per claim, responding to regulatory and statutory claims; and (c) Third-Party Liability insurance. All policies shall name the Employer as co-insured and shall contain a waiver of subrogation in favour of the Employer. The Contractor shall provide certificates of insurance to the Employer within [14] days of the Commencement Date.”

Negotiation notes: The 24-month post-completion tail is critical, it should align with the period during which a risky-building designation may realistically be made following works completion. Employers in high-seismic zones may demand a longer tail. Contractors should negotiate the premium allocation with the employer, particularly for retrofit-specific coverage that would not arise in standard new-build projects.

Specific Model Clause: Retrofit/Demolition Order, Allocation & Procedure

“In the event that any competent authority issues an order under Law No. 6306 or the Regulation requiring the retrofit, strengthening or demolition of any structure forming part of the Works: (a) the party receiving the order shall notify the other within [7] days, enclosing a copy of the order; (b) the parties shall meet within [14] days to agree a programme of compliance; (c) costs of compliance shall be allocated as follows: [insert allocation, e. g.

‘borne by the Employer save to the extent that the order results from a defect attributable to the Contractor’s workmanship or materials’]; (d) the Contractor shall be entitled to an extension of time to the extent that compliance with the order impacts the critical path; (e) failing agreement on cost allocation or programme, either party may invoke the dispute-resolution procedure under Clause [X].

Negotiation notes: The cost-allocation mechanism in sub-clause (c) is the key commercial battleground. Employers will seek to place all retrofit costs on the contractor; contractors should limit their exposure to defects within their scope and insist on clear carve-outs for pre-existing conditions, design defects (where a separate designer is engaged) and regulatory changes post-completion.

Dispute Resolution: Arbitration Options, Clause Drafting & Seat Selection (ICC vs ISTAC vs Ad Hoc)

Construction arbitration in Turkey has matured significantly, with both international and domestic arbitral institutions now well-equipped to handle complex, multi-party urban transformation disputes. The choice of institution, seat and procedural framework can materially affect the enforceability of awards and the availability of interim relief.

Can disputes about Law No.6306 matters be resolved by arbitration? The answer is nuanced. Contract-based claims, breach of contract, indemnity claims, defective-workmanship disputes, price-adjustment disagreements, are fully arbitrable under Turkish law. However, the administrative and public-law dimensions of Law No.6306 (such as the validity of a risky-building designation or a municipal demolition order) are not arbitrable, because they fall within the exclusive jurisdiction of the administrative courts. Construction lawyers in Turkey must therefore draft arbitration clauses that clearly delineate the arbitrable contractual claims from the non-arbitrable public-law decisions.

Model Arbitration Clause for Urban-Transformation Projects

Variant A, ICC (international projects):

“All disputes arising out of or in connection with this Contract, excluding challenges to the validity of administrative orders under Law No.6306 which shall be referred to the competent administrative courts, shall be finally resolved by arbitration under the Rules of Arbitration of the International Chamber of Commerce by [one/three] arbitrator(s) appointed in accordance with the said Rules. The seat of arbitration shall be Istanbul, Turkey. The language of the arbitration shall be [English/Turkish]. The arbitral tribunal shall have the power to order interim and conservatory measures.”

Variant B, ISTAC (domestic or regional projects):

“All disputes arising out of or in connection with this Contract, excluding challenges to the validity of administrative orders under Law No.6306 which shall be referred to the competent administrative courts, shall be finally resolved by arbitration administered by the Istanbul Arbitration Centre (ISTAC) under the ISTAC Arbitration Rules in force at the date of commencement of the arbitration. The tribunal shall consist of [one/three] arbitrator(s). The seat shall be Istanbul. The language shall be Turkish.”

Evidence, Experts & Technical Disputes

Law No.6306 disputes are inherently technical, they involve structural engineering assessments, material-testing results and geotechnical data. Arbitral tribunals should be empowered to appoint independent technical experts under the applicable institutional rules. Early indications suggest that tribunals seated in Istanbul increasingly favour the appointment of tribunal-appointed experts alongside party experts, particularly where the adequacy of a structural retrofit is in dispute. Parties should budget for expert evidence from the outset and agree on document-production protocols that preserve the integrity of technical records.

Interim Measures & Injunctive Relief

Where a retrofit or demolition order creates urgency, for example, an imminent municipal step-in that would destroy evidence or alter the subject matter of the dispute, interim measures become critical. Under ICC Rules, parties may apply to an emergency arbitrator before the tribunal is constituted. ISTAC’s rules also provide for emergency measures. In parallel, Turkish courts retain jurisdiction to grant interim measures in support of arbitration (under Turkish International Arbitration Law No.4686), including orders to preserve evidence, restrain demolition pending arbitration, or secure assets. The likely practical effect is that parties will frequently need to coordinate applications before both the arbitral institution and the Turkish courts to achieve comprehensive interim protection.

Enforcement of Arbitration Awards in Turkey & Interaction with Public-Law Orders

Turkey is a signatory to the 1958 New York Convention on the Recognition and Enforcement of Foreign Arbitral Awards, and Turkish courts regularly enforce both domestic and foreign arbitral awards. However, enforcement becomes complex where an award intersects with a public-law order under Law No.6306.

How Turkish Courts Treat Awards Involving Administrative Orders

The public-policy exception to enforcement under the New York Convention is narrowly construed by Turkish courts, but it remains available. Industry observers expect that an award purporting to override or set aside an administrative demolition or retrofit order would face resistance at the enforcement stage on public-policy grounds. The practical guidance is therefore to structure both the arbitration clause and the claim strategy to address contractual consequences (damages, indemnities, price adjustments) rather than challenging the administrative order itself.

Practical Compliance Checklist for Contractors

The following checklist is designed for main contractors and specialist subcontractors operating on projects that may be affected by Law No.6306 and its 2026 amendments. It should be adapted to each project’s specific circumstances.

Pre-contract phase:

• Verify whether the project site falls within a designated transformation area
• Obtain and review any existing hazard-assessment reports for the building
• Confirm the building’s land-registry status (check for risky-building annotations)
• Assess seismic-zone classification and applicable building codes
• Budget for Law No.6306 compliance costs in the tender price
• Include regulatory-change price-adjustment clause in the contract
• Negotiate clear retrofit/demolition risk-allocation provisions
• Secure appropriate insurance coverage (CAR, PI, third-party liability) with post-completion tail
• Agree arbitration clause (ICC or ISTAC) with clear carve-out for administrative-court matters

During construction:

• Maintain a complete document archive (structural calculations, material tests, as-built drawings, variation orders, inspection reports)
• Comply with all municipal and Ministry reporting requirements within prescribed timescales
• Monitor Official Gazette publications for further amendments to Law No.6306 or the Regulation
• Ensure subcontractors maintain equivalent records and back-to-back insurance
• Conduct periodic internal compliance audits against the current Regulation requirements

Post-completion / on receipt of a retrofit or demolition order:

• Preserve all project documentation immediately upon receiving any notice from authorities
• Notify the employer and insurer in writing within contractual timeframes
• Assess the scope of the order and determine whether it falls within the contractor’s contractual obligations
• Engage specialist construction lawyers in Turkey to advise on compliance and dispute-resolution options
• If the order is disputed, consider applying for interim measures (arbitral emergency procedures and/or Turkish court applications) to preserve evidence and maintain the status quo
• Begin compliance works within prescribed statutory timescales to avoid administrative step-in and cost recovery
• Document all compliance costs for potential recovery under the contract or arbitration

Conclusion & Next Steps, Instructing Counsel and Negotiating Compliance

The February 2026 amendments to Law No.6306 have raised the stakes for every contractor operating in Turkey’s urban transformation programme. Retrofit obligations are no longer distant administrative requirements, they are immediate contractual and statutory liabilities with compressed timescales and real enforcement consequences. Contractors who act now to audit their project portfolios, strengthen their contractual protections and establish clear arbitration mechanisms will be better positioned to manage both compliance costs and dispute exposure.

For contractors seeking specialist guidance, construction lawyers in Turkey with direct experience of Law No.6306 proceedings, ICC and ISTAC arbitration and municipal enforcement practice can provide contract reviews, compliance audits and dispute-resolution strategy tailored to each project’s risk profile. Early instruction, before a retrofit order materialises, is invariably more cost-effective than reactive crisis management.

Sources

1. Law No.6306 on the Transformation of Areas Under Disaster Risk, Mevzuat (Official Gazette)
2. Ministry of Environment, Urbanisation and Climate Change (Turkey), Urban Transformation Guidance
3. Istanbul Arbitration Centre (ISTAC), Rules & Guidance
4. International Chamber of Commerce (ICC), Arbitration Rules
5. New York Convention on the Recognition and Enforcement of Foreign Arbitral Awards (1958)
6. Society of Construction Law Türkiye (SCL Turkey)
7. The Legal 500, Turkey: Real Estate and Construction