Change Impact Assessment — Independent Unit Number
A change to an independent-unit identifier should never be treated as a cosmetic edit until its effect is understood. In a condominium transaction, one number can connect the title record to the approved project, valuation, contract, payment description, handover file, insurance, utilities, tenancy records and future resale documents. Some changes are harmless address updates; others signal a different legal unit, a project amendment, a subdivision, merger or correction. The task of a change-impact assessment is to distinguish these cases before the new information is accepted into the transaction file.
First question: what exactly changed?
Do not start by editing every document to the newest number. Start by classifying the change. Is it only a municipal door number? A site-management renumbering? A developer marketing code? A corrected block or floor description? A change in the approved architectural project? A division or combination of independent units? A change of registered use? A change to an annex, such as parking or storage? Or an actual correction to the land-registry independent-unit number? Each category has a different consequence. A door-number change may require address and utility updates but leave title identity untouched. A registered-unit change can affect the object of the sale itself.
TKGM’s condominium framework connects independent units to the approved architectural project and the land registry. The 2021/4 circular and its amendment published on 2 July 2026 are therefore important current references when the change concerns condominium or construction-servitude data. A project-based change should be verified from the competent project/registry source; an internal spreadsheet is not enough.
Build a before-and-after identity table
Create one row for the old state and one for the proposed new state. Record the main property identifiers, independent-unit number, block, floor, position, registered use or nature, land share, annexes and registered owner. Add physical door number and marketing code only as secondary identifiers. Then cite the source and date for each row. This simple structure exposes whether the “change” is actually one field changing on the same legal unit or whether multiple fields now point to a different unit.
Never erase the old row. If the change is legitimate, the transaction may still need the previous identifier to connect earlier payments, invoices, reservation forms or valuations to the same asset. A clean audit trail shows when the new identifier became authoritative and what document caused the transition.
Map the dependent documents
Once the changed field is known, identify everything that depends on it. A reservation form may need an addendum. A preliminary contract may require correction. A bank valuation may have to be reissued or formally confirmed against the revised identity. Payment descriptions should not suddenly use a new unit code without an explanation. A DASK or other insurance policy, utility subscriptions, management records and lease documents may need address or unit mapping. If citizenship, mortgage or another regulated workflow is involved, the impact may be wider because the property identity must remain consistent across the regulated file.
Do not assume that a corrected commercial document corrects the registry. The direction of proof matters: transaction documents should be aligned to the competent official record, not the official record inferred from a revised sales sheet. Likewise, an official address change does not by itself change ownership or the registered independent-unit identity.
Assess legal and economic impact separately
Legal impact asks whether the object of ownership, registered use, land share or annex rights changed. Economic impact asks whether size, floor, orientation, parking, storage, permitted use, valuation or marketability changed. A renumbering with no substantive change may have low economic impact but still require careful document reconciliation. A project amendment that moves the unit, changes its use or modifies annexes may affect price, valuation and the buyer’s decision even if the parties could technically continue the transaction.
If the change concerns the land share, do not treat it as a formatting issue. In condominium ownership the arsa payı is linked to the independent unit and can matter to rights and future redevelopment questions. It requires its own evidence and may trigger the ownership-share-ratio records rather than being buried inside a numbering correction.
Control the decision before accepting the change
For each affected item, assign one of four statuses: unaffected; administrative update required; substantive re-review required; or transaction stop until resolved. Name the evidence needed to close the item and the person responsible. A new version should not silently replace an approved version. If a contract, valuation or bank instruction previously relied on the old identifier, explicitly reopen that approval and document why the new version is acceptable.
Examples of high-risk change patterns
High-risk patterns include a “corrected” unit number received just before payment; a valuation describing a different floor than the contract; a project list that shows the same commercial code against another independent-unit number; a parking space disappearing from the revised annex list; a unit shown as residential in marketing but with a different registered nature; or a seller explaining the mismatch only with a screenshot. These are not proof of wrongdoing, but they are reasons to stop automated acceptance and return to the competent source.
Closing standard
The assessment is complete when the reviewer can explain what changed, why it changed, which official source controls, which documents were affected, what was corrected, and whether price, rights, timing or transfer readiness changed. Preserve both the superseded and controlling versions where history matters. The final note should be specific enough that a future buyer, bank, lawyer or auditor can reconstruct the transition without relying on memory. A change becomes safe to use only after its dependencies have been reconciled.
Official sources
- TKGM — 2021/4 Kat İrtifakı ve Kat Mülkiyeti guidance and the amendment published 2 July 2026.
- Law No. 634 on Condominium Ownership through the Ministry of Justice legislation system.
- TKGM Web Tapu and official land-registry records for current registered property identity.
- Approved architectural project and amendment documentation from the competent authority when the change originates in the project.