Real estate buyers frequently assume that once they have obtained a title deed, the exact location, boundaries and surface area of the property are beyond dispute.

In practice, this assumption can be dangerous.

A Turkish title deed may correctly identify the registered owner while a technical issue still exists concerning:

• the cadastral boundary;
• parcel coordinates;
• surface area;
• cadastral map;
• relationship between the map and the physical land;
• property description;
• share ratios;
• building designation; or
• the legal registration itself.

Turkish property law therefore requires a distinction between ownership records and the technical identification of the land to which those ownership rights relate.

Article 1003 of the Turkish Civil Code expressly provides that an officially measured plan forms the basis for the registration and identification of immovable property.

For investors, developers and individual buyers, this means that legal due diligence should not end with reading the title deed.

The more important question may sometimes be:

Does the parcel shown in the official records actually correspond to the land the buyer believes he or she is purchasing?

1. What Do “Map,” “Block” and “Parcel” Mean in Turkish Real Estate Practice?

Turkish cadastral records identify land through technical and registration information.

The most commonly encountered terms are:

Ada — cadastral block:
A group of parcels identified within the cadastral or zoning system.

Parsel — parcel:
The individual unit of land identified within that block.

Pafta — cadastral map sheet:
The technical map on which parcels and their geometrical relationships are represented.

The cadastral system therefore does more than record who owns land. It also provides the technical framework for defining where that land is located and what its legal geometry is.

This is consistent with Article 1003 of the Turkish Civil Code, which makes the officially measured plan the foundation for identifying an immovable property in the registry.

2. A Title Deed Can Be Correct While the Parcel Still Has a Technical Problem

Not every property problem involves an incorrect owner.

For example, the title deed may correctly state:

Owner: A
Block: 125
Parcel: 14
Surface area: 2,000 m²

Yet a later technical examination may reveal that:

• the registered area does not correspond to the recalculated area;
• one boundary line has been drawn incorrectly;
• old survey measurements contain an error;
• the cadastral map does not properly correspond to the physical ground;
• neighbouring parcels overlap in practice;
• a building is partly situated outside the registered parcel;
• the property’s nature has been incorrectly entered in the register; or
• the cadastral data require updating.

The Turkish system therefore distinguishes between simple registration mistakes and more substantive cadastral or geometric errors. TKGM’s correction rules separately address identity information, surface-area and property-description mistakes, and technical errors arising from measurement, boundary determination, plotting or calculations.

3. Not Every Difference Is Legally an “Error”

This distinction became particularly important following a major amendment in 2026.

Law No. 7579, published in the Official Gazette on 22 May 2026, amended Article 41 of the Cadastral Law No. 3402.

The amended provision now expressly distinguishes between:

difference — fark,

tolerance — yanılma sınırı / tecviz,

and

error — hata.

Under the new statutory language, differences may arise when values such as coordinates or surface area calculated at the time the cadastral plan was originally prepared are recalculated using modern technology.

A scientifically acceptable variation resulting from the production method, map scale and measurement technique constitutes the applicable tolerance.

A technical error, in the statutory sense, arises where the difference exceeds that tolerance.

This distinction is highly relevant to contemporary real estate transactions.

A purchaser should therefore not automatically assume that a modern GPS measurement differing slightly from an old title record proves that the property was incorrectly registered.

The technical origin and legal significance of the difference must first be determined.

4. Article 41 of the Cadastral Law Is the Central Provision for Technical Errors

Article 41 of Law No. 3402 is one of the most important provisions where a technical cadastral problem is discovered.

Following the 2026 amendment, the provision covers differences arising from matters such as:

• measurement;
• boundary determination;
• cadastral plotting;
• calculations; and
• the geometric condition of parcels whose cadastral status has already become final.

The amended law permits relevant corrections upon application or ex officio by the cadastral administration. Importantly, the statutory text now provides that the entire difference is taken into account in the correction procedure.

Therefore, a technical dispute should first be classified correctly.

A genuine measurement or plotting error may be subject to Article 41.

A dispute concerning ownership itself may require a completely different judicial remedy.

5. Affected Owners Must Be Notified

Article 41 does not allow a technical correction affecting registered land to occur without procedural protection for interested parties.

The correction must be notified to the property owners and other right holders.

Under the amended provision, an interested person who objects to the correction may bring an action seeking cancellation of the correction before the Civil Court of Peace — Sulh Hukuk Mahkemesi — within 30 days from notification.

If no such action is filed within that period, the correction becomes final.

The commencement of the period is tied to notification, a point also confirmed in TKGM’s published guidance concerning Article 41 correction procedures.

For lawyers and investors, this means that a technical correction notice should never be treated as ordinary administrative correspondence.

The 30-day period may directly determine whether the correction can still be challenged through this specific procedure.

6. Surface-Area Differences Can Have Direct Financial Consequences

One of the most commercially significant technical problems is a discrepancy in the property’s surface area.

Suppose an investor believes that he has purchased:

10,000 m²

but a later measurement shows that the property is materially smaller.

The first legal question is not immediately whether the land registry is wrong.

The source of the discrepancy must first be identified.

It may arise from:

• an error in the sales documentation;
• an old cadastral measurement;
• incorrect plotting;
• a boundary error;
• a modern recalculation;
• occupation by a neighbour; or
• an incorrect entry into the land registry.

Different causes may create different remedies.

7. The Turkish Code of Obligations Contains a Special Rule on Missing Surface Area

Article 244 of the Turkish Code of Obligations contains an especially important rule for real estate transactions.

As a general rule, if the property does not contain the surface area stated in the sales agreement, the seller may be responsible to the buyer for the deficiency.

However, the law contains an important exception:

Where the surface area entered in the land registry is based on an official measurement, the seller is not automatically responsible for the deficiency unless the seller specifically assumed responsibility for that area.

This provision creates an important distinction.

A buyer cannot simply argue:

“The title said 5,000 m² but I measured 4,850 m², so the seller automatically owes me compensation.”

The legal analysis must determine:

1. what area was contractually promised;
2. whether the registry area derives from an official measurement;
3. whether there is actually a cadastral error;
4. whether the seller specifically guaranteed a particular area; and
5. whether the physical difference results from unlawful occupation rather than registration.

8. A Fence Is Not Necessarily the Legal Boundary

One of the most practical risks when buying land is relying on what is physically visible.

A wall, wire fence, hedge, road, agricultural use line or row of trees may appear to mark the parcel boundary.

But physical occupation does not automatically establish the official cadastral boundary.

For high-value land, the parcel should therefore be technically identified on the ground through an aplikasyon procedure rather than relying only on visual inspection.

TKGM states that, in areas falling within the authority of a licensed cadastral surveying office, parcel application procedures are carried out through LİHKAB — Licensed Surveying and Cadastral Engineering Offices.

This becomes especially important for:

• villas;
• development land;
• factories;
• agricultural properties;
• neighbouring parcels under common use;
• coastal land; and
• parcels on which new construction is planned.

9. Why Parcel Application Should Be Part of High-Value Due Diligence

A title deed tells the investor which parcel is registered.

An application survey helps determine where the official parcel boundaries physically lie on the ground.

That can reveal problems that may never appear during an ordinary title search.

For example:

The swimming pool may be partly on the neighbouring parcel.

A warehouse wall may extend outside the registered boundary.

The road used to access the property may not actually lie within the parcel.

A neighbour’s wall may occupy part of the investor’s land.

These situations can later affect construction, financing, valuation, resale and relations with neighbours.

10. Registration Error and Cadastral Error Are Not the Same Thing

Another critical distinction is between a registration mistake and a technical cadastral mistake.

A registration mistake may involve, for example:

• a misspelled owner’s name;
• incorrect identification information;
• incorrect property description;
• an incorrect surface-area entry copied from the underlying document;
• incorrect share information; or
• a clerical error in the land registry.

A cadastral error, by contrast, may involve the property’s geometry itself:

• measurement;
• boundary determination;
• plotting;
• coordinates; or
• area calculation.

TKGM’s 2016/2 Circular specifically distinguishes simple registration errors relating to surface area or property nature from errors arising from measurement, boundary determination, plotting and calculations.

This distinction determines which correction procedure should be followed.

11. Some Simple Land Registry Errors Can Be Corrected Administratively

Not every land registry mistake requires a lawsuit.

Article 1027 of the Turkish Civil Code provides that simple clerical mistakes may be corrected by the land registry administration under the applicable rules. More substantial corrections generally require either the written consent of the interested parties or a judicial decision.

TKGM similarly provides administrative procedures for correcting certain identity and clerical errors.

For example, a person whose name has been incorrectly entered in the registry may apply through Web Tapu or the relevant TKGM channels for correction under the Tapu Registry Regulation and TKGM’s 2016/2 Circular.

Where the error originates from the administration itself, TKGM states that correction may be completed without the ordinary title fee and revolving-fund service charge.

12. A Correction Cannot Be Used to Secretly Transfer Ownership

An important safeguard exists in the correction procedure.

TKGM’s rules expressly state that correcting identity information cannot result in the transfer of the registered right to another person.

This means that a correction procedure cannot legitimately be used as a substitute for:

• a sale;
• inheritance transfer;
• title cancellation action; or
• another transaction transferring ownership.

Where the real dispute is:

“The person registered as owner should not be the owner at all,”

the issue is no longer a simple correction problem.

It becomes a substantive property-right dispute.

13. Unlawful Registration Requires a Different Remedy

Where an ownership or other real right has been unlawfully registered, Article 1025 of the Turkish Civil Code provides a judicial remedy.

A person whose real right has been harmed by an unlawful registration, deletion or alteration may seek correction of the land registry through litigation.

This is fundamentally different from correcting a typographical mistake.

Examples may include:

• the wrong person being registered as owner;
• an invalid transfer;
• unlawful deletion of a real right;
• legally defective title registration; or
• a registration based on an invalid legal transaction.

The legal strategy therefore depends on determining whether the problem is technical, clerical, or substantive.

14. Good-Faith Third Parties Can Complicate the Problem

Technical and registration disputes become more difficult when the property has subsequently been transferred.

Article 1023 of the Turkish Civil Code protects, subject to statutory conditions, a third person who acquires a real right in good faith by relying on the land registry.

Article 1024, however, denies that protection to a person who knew or should have known that the registration was unlawful.

Therefore, where a registration problem affects ownership itself, speed can become crucial.

A dispute that initially exists between two persons may become considerably more difficult once the property is sold, mortgaged or otherwise transferred to another party.

15. Cadastral Updating Can Change Registered Surface Area

Older cadastral systems are periodically updated.

TKGM expressly states that cadastral updating work can result in surface-area changes compared with previously registered figures because of the technical nature of the updating process.

This has an important transactional consequence.

A parcel may contain an annotation indicating that it is subject to updating or digitisation.

TKGM confirms that such a parcel can still generally be sold, but specifically recommends obtaining information from the relevant cadastral directorate because the parcel’s area may change during the updating or digitisation work.

For an investor purchasing land based on a price per square metre, this information can be highly material.

16. Objections During Cadastral Updating Must Be Made Promptly

TKGM provides different procedural stages for objections to cadastral updating.

Interested persons may object to the cadastral administration during the work and before the final display process.

During the final 30-day public display period, an action may be brought before the cadastral court.

After those stages, disputes may have to be pursued before the ordinary civil courts according to the applicable rules.

This illustrates why the procedural posture of the parcel must first be established.

The answer to:

“Which court should we sue in?”

depends partly on whether the cadastral work is ongoing, under public display, final, or subject to a later correction procedure.

17. Initial Cadastral Determinations Also Have Strict Time Limits

The initial cadastral process has its own objection mechanism.

TKGM explains that objections may be submitted while cadastral work is continuing and that disputes concerning results announced during the 30-day cadastral display period may be brought before the competent cadastral court.

After cadastral determinations become final, claims based on legal grounds existing before the cadastral determination are subject to the significant 10-year forfeiture period under Article 12 of the Cadastral Law. TKGM also expressly warns of this ten-year period.

This distinction is extremely important.

A modern technical correction claim under Article 41 should not automatically be confused with an old ownership claim based on circumstances preceding the original cadastre.

18. A Zoning Parcelisation Dispute Is Not Necessarily a Cadastral Error

Another common mistake is to classify every parcel problem as a cadastral issue.

Suppose a landowner owns one cadastral parcel, but after an Article 18 zoning implementation receives a different zoning parcel.

That does not automatically mean that the cadastral directorate made an error.

TKGM expressly states that objections concerning parcelisation plans should be directed to the administration that performed the zoning implementation, because cadastral directorates are not the authorities that prepare those parcelisation plans.

Consequently, disputes arising from:

3194 Zoning Law Article 18 applications,

land readjustment,

zoning parcelisation,

and

cadastral technical errors

must not be mixed together.

They may fall within different branches of jurisdiction and require different remedies.

19. Technical Errors Can Stop or Delay a Real Estate Transaction

Even a comparatively minor registration problem may cause practical difficulties during:

• sale;
• mortgage establishment;
• development financing;
• subdivision;
• merger of parcels;
• construction permitting;
• establishment of easements;
• inheritance transfer; or
• condominium transactions.

TKGM’s correction rules state, for example, that certain registered identity information should be corrected before requested dispositive transactions can proceed.

Therefore, what initially looks like an insignificant spelling or registration error can become commercially important immediately before closing or financing.

20. Development Projects Are Especially Sensitive to Boundary Errors

Boundary uncertainty can be particularly costly for developers.

Construction projects rely on precise parcel geometry.

A boundary difference discovered after architectural and engineering projects have been prepared may affect:

• building setbacks;
• building footprint;
• access;
• parking;
• easements;
• landscaping;
• infrastructure;
• allowable construction area; and
• relations with adjoining landowners.

The economic effect of a one-metre boundary displacement can therefore be much greater in a high-density urban development than in undeveloped rural land.

This is why a high-value development acquisition should combine legal due diligence with cadastral and surveying due diligence.

21. State Liability May Arise From Land Registry Errors

The Turkish Civil Code also contains an important compensation mechanism.

Article 1007 states that the State is responsible for all damage arising from the keeping of the land registry.

The State may subsequently seek recourse against the officials whose fault caused the damage.

Actions relating to this State liability are heard by the court where the relevant land registry is located.

Therefore, where a person suffers quantifiable damage because of an error for which the land-registration system is legally responsible, compensation against the State may need to be examined in addition to correction of the register itself.

However, the existence of a discrepancy does not automatically create compensation liability.

The source of the error, causation and actual damage must be established.

22. Buyer-Seller Liability and Registry Liability Should Be Analysed Separately

A technical parcel problem may create several different legal relationships at the same time.

For example, an investor buys land advertised as 8,000 m².

Later it is determined to be substantially smaller.

Potential issues may include:

Seller liability:
Was the seller contractually responsible for the represented area?

Cadastral correction:
Is there an Article 41 technical error?

Land registry correction:
Was the correct technical information incorrectly entered into the register?

State liability:
Did the buyer suffer damage arising from the keeping of the registry?

Neighbour dispute:
Is the missing area actually occupied by an adjoining owner?

These are legally different questions.

A strong case requires identifying which problem actually caused the loss.

23. What If the Building Is on the Wrong Parcel?

One of the most serious technical discoveries occurs when a structure has been built partly or entirely outside the intended parcel.

Possible scenarios include:

• a building extending into a neighbouring parcel;
• villas being constructed on shifted parcel lines;
• a wall enclosing land belonging to another owner;
• a building shown on the wrong cadastral position; or
• a development involving several parcels whose physical layout does not match the registered plan.

Such cases should immediately trigger both:

a cadastral investigation
and
a property-law investigation.

The consequences can involve ownership claims, prevention of interference, compensation, construction-law issues and problems with future sale or mortgage transactions.

24. Foreign Investors Face the Same Technical Risk

Foreign buyers often focus heavily on:

• ownership restrictions;
• valuation requirements;
• citizenship eligibility;
• payment documentation; and
• title transfer.

However, none of those checks substitutes for cadastral due diligence.

A foreign buyer can legally acquire the correct title deed and still discover that:

• the villa wall exceeds the parcel boundary;
• the garden being used is not included in the property;
• the surface area will change after cadastral updating;
• the parcel indicated by an estate agent is not the land physically shown to the buyer; or
• the investment property has an unresolved cadastral correction annotation.

For land and villa purchases in particular, independent technical verification is therefore highly advisable.

25. What Should Be Checked Before Buying Land in Turkey?

For a high-value acquisition, a buyer should ordinarily examine more than the title deed.

A comprehensive technical and legal investigation may include:

1. current title deed record;
2. historical title transactions;
3. cadastral map;
4. block and parcel information;
5. official surface area;
6. cadastral coordinates;
7. parcel application survey;
8. physical boundary markers;
9. neighbouring parcels;
10. current use and occupation;
11. cadastral updating or digitisation annotations;
12. pending Article 41 correction procedures;
13. easements;
14. zoning parcelisation history;
15. Article 18 zoning implementation history;
16. building location relative to parcel boundaries;
17. official property classification;
18. existing technical reports; and
19. any pending litigation concerning boundaries or title.

For development land, the cadastral review should then be combined with a separate zoning investigation.

26. The Most Important Practical Rule: Do Not Buy the Fence — Buy the Parcel

A buyer visiting land is usually shown a physical area.

The estate agent may say:

“The property begins here and ends at that wall.”

From a legal perspective, this statement is not enough.

The purchaser is acquiring the parcel defined through the land registry and official cadastral system — not necessarily the area that has historically been fenced, cultivated or used.

For valuable land, the legal boundary should therefore be independently confirmed before the purchase price is paid.

Conclusion: Technical Land Due Diligence Can Be as Important as Legal Title Due Diligence

A title deed answers the critical question:

Who is registered as owner?

But it does not always answer:

Where exactly is the property?

What is its correct surface area?

Are the physical boundaries consistent with the cadastral map?

Is the building entirely within the parcel?

Is the registered information technically accurate?

Turkish law provides several different mechanisms depending on the nature of the problem.

Technical cadastral errors may fall within Article 41 of the Cadastral Law No. 3402, which was substantially amended on 22 May 2026.

Simple land registry mistakes may be capable of administrative correction, while substantive unlawful registrations may require litigation under Articles 1025 and 1027 of the Turkish Civil Code.

Surface-area shortages may also create separate contractual questions between buyer and seller under Article 244 of the Turkish Code of Obligations.

Finally, damage arising from the keeping of the land registry may, where the statutory conditions are established, engage State liability under Article 1007 of the Turkish Civil Code.

The correct strategy therefore begins by determining whether the problem is:

a surveying problem,
a cadastral problem,
a registration problem,
an ownership problem,
a zoning problem,
or a contractual problem.

Only then can the appropriate administrative or judicial remedy be selected.