Renovating an Old Apartment in Istanbul: An Architect's 2026 Guide

Renovating an old apartment in Istanbul is less about choosing finishes than about learning what's structural and whose sign-off you need before you touch a wall. A flat in Kadıköy or Beşiktaş built before the 1999 Marmara earthquake plays by different rules than one framed after. Any apartment renovation Istanbul owners plan begins with two unknowns: what's load-bearing, and who has to say yes. Get those wrong and the code catches you. Turkey's 2018 earthquake code, TBDY 2018, has been in force since 1 January 2019, and it decides how far a structural change can go.

Quick Summary:

• Cosmetic work (paint, plaster, flooring, fixtures) needs no permit; touching the load-bearing system needs a tadilat ruhsatı.
• Once a change is structural, Turkey's 2018 earthquake code (TBDY 2018) applies.
• Facade, shared risers, and common areas need owners'-board consent under the Condominium Law; you can't act alone.
• The building's construction era, pre-2000 versus post-2001, shapes the whole plan.

What an Apartment Renovation in Istanbul Actually Involves

An apartment renovation in Istanbul falls into two camps: a cosmetic refresh that changes surfaces, and a gut or structural renovation that changes the building itself. The first swaps paint, flooring, kitchens, and bathrooms without touching what holds the flat up. The second moves walls, re-routes risers, or opens the plan, and that's where Istanbul's older stock makes the work harder than a Western reno.

Most flats built before 2000 hide surprises behind the plaster, so the honest first step is finding out which camp your project falls in. If you're building from scratch instead, the phases differ again.

Why the Building's Age Changes Everything: Pre-2000 vs Post-2001

The 17 August 1999 Marmara earthquake exposed how much pre-2000 stock was built with weak concrete, plain (smooth) rebar, no soil study, and no independent inspection. In response, the 2001 inspection reform (Building Inspection Law No. 4708) made independent inspection mandatory and brought in ribbed rebar, ready-mix concrete norms, and soil investigation.

The rough dividing line runs like this:

• Pre-2000: more likely weak concrete, no inspection trail, undocumented later changes.
• Post-2001: more likely sound, with an inspection record you can request.

Here's the honest part: age is a signal, not a verdict. A well-built 1980s block can outperform a corner-cut 2010 one. Only a structural assessment confirms it, which is where earthquake-resistant design in Turkey starts.

Do You Need a Permit? Cosmetic vs Structural Work

You need a permit only when the work touches structure. Under Turkey's Zoning Law No. 3194, Article 21, simple repairs (basit tamirat) need no permit. Anything that alters the taşıyıcı sistem (load-bearing system) requires a tadilat ruhsatı, the renovation permit.

No permit needed (basit tamirat):

• Paint, plaster, and surface finishes
• Flooring and ceiling coverings
• Doors, windows, and fixtures
• Non-structural electrical and plumbing repairs

Permit needed (tadilat ruhsatı):

• Removing or moving a load-bearing wall
• Changing the structural layout
• Any work affecting the building's frame

A full yapı ruhsatı is the construction permit for new builds and major works, covered in the full construction-permit process in Istanbul. The moment the work touches a load-bearing wall, you've left cosmetic territory and need a permit. This is due-diligence guidance, not legal advice.

How Does Turkey's 2018 Earthquake Code Affect a Renovation?

Once your renovation triggers a permit, meaning it touches the load-bearing system, it falls under TBDY 2018 (Türkiye Bina Deprem Yönetmeliği), Turkey's Building Earthquake Code. Published in 2018 and in force since 1 January 2019, it's issued by AFAD, and its Chapter 15 (Bölüm 15) governs the assessment and strengthening of existing buildings.

In plain terms: a cosmetic refresh doesn't invoke the code, but the moment you alter the structure, the change is evaluated against current seismic standards. That's why a structural engineer joins the team early, not at the end.

Whose Permission Do You Need? The Building's Owners' Board

For anything beyond your own four walls, you need your neighbours. Under the Condominium Law (Kat Mülkiyeti Kanunu, Law No. 634), Article 19, a single owner cannot alter or repair common areas without the written consent of four-fifths of all unit owners. Facade, shared risers, and load-bearing walls all count as common elements.

This is the surprise that catches most foreign owners: you don't fully control your own flat where shared elements are involved. Repainting the exterior, enclosing a balcony, or touching a shared riser all run through the owners' board (kat malikleri kurulu) process.

There's a narrow exception: urgent common-area repairs or court-established strengthening (güçlendirme) can proceed without the full vote. In our experience, most renovations that reach the facade or risers still need the neighbours on board first.

Architect or Contractor: Who Do You Actually Need?

A contractor is enough for a cosmetic refresh. You need a licensed architect the moment your scope hits structure, permits, or common areas, because permit drawings must be prepared, signed, and sealed by an architect registered in Turkey. A contractor cannot sign that set.

Decide by scope:

• Cosmetic refresh, no permit: a good contractor can run it.
• Structural work, permit required: a licensed architect prepares and seals the drawings.
• Common-area or facade work: architect plus the owners'-board process.

One check nobody in the search results teaches: confirm the architect is a registered member of Mimarlar Odası (the Chamber of Architects, under TMMOB), which lets them legally sign your permit set. For the full method, read how to choose an architecture firm in Turkey and the questions to ask your architect.

Hidden Surprises in Old Istanbul Buildings

Open enough old Istanbul apartments and the same problems keep turning up. We've stripped back flats in Kadıköy, Beşiktaş, and Şişli where the plan looked simple on paper and the building had other ideas.

In our experience, these are the recurring finds:

• That "just a partition" turns out to be a shear (perde) wall carrying load. In old Istanbul stock, the wall a client wants gone is often the one holding the building up.
• The cast-iron waste riser is shared with the flats above and below, so it can't be re-routed without the neighbours' agreement.
• The original electrical was never sized for today's loads, so a full rewire comes before any finishes.
• A balcony was enclosed years ago without permission, an unpermitted change you inherit.
• New screed and levelling quietly eat the ceiling height you were counting on.

None of these are dealbreakers. They just have to surface during survey, not during demolition.

How Long Does an Apartment Renovation in Istanbul Take?

A cosmetic refresh runs a few weeks. A structural, permitted apartment renovation in Istanbul runs several months, because design, permits, and proper sequencing all take time. Permit processing itself varies by municipality, roughly a few weeks to a couple of months.

Phase by phase, a full renovation moves like this:

• Survey and measured drawings: about one to two weeks.
• Design and detailing: a few weeks, depending on scope.
• Permit, if triggered: weeks to a couple of months, depending on the municipality.
• Strip-out and MEP first fix: several weeks.
• Waterproofing (su yalıtımı) and wet areas: allow proper curing time, never rushed.
• Finishes: the longest visible phase, shaped by material lead times and your chosen current Istanbul residential design directions.
• Snagging and handover: a final week or two.

Timelines shift with scope, and with how fast owner decisions come back from abroad.

How DEEX Studio Approaches Renovation

DEEX Studio is an Istanbul-based architecture and interior design studio, and much of our work is renovating older flats for owners watching from abroad. We open with an early structural review, so the load-bearing reality is known before anyone commits to a plan, and we run weekly video walkthroughs so progress is visible without a flight to Istanbul.

We're not the right fit for every job. If yours is a quick cosmetic refresh with a contractor already lined up, you may not need us, and we'll say so.

Get a free, scope-based consultation and we'll walk through your flat's scope together, no pressure.

About DEEX Studio

DEEX Studio is an Istanbul-based architecture and interior design studio working across residential, commercial, and hospitality projects in Turkey. Our focus areas include Istanbul architecture, earthquake-resistant design, natural stone (Turkish travertine and marble), and remote project management for non-resident owners.

Frequently Asked Questions

Do I need a permit to renovate my apartment in Istanbul?

Only for structural work. Cosmetic repairs (basit tamirat) like paint, flooring, and fixtures need no permit. Any change to the load-bearing system (taşıyıcı sistem) requires a tadilat ruhsatı under Zoning Law No. 3194.

Do I need my building's permission to renovate?

For your own interior, no. For common areas, facade, or shared risers, yes. The Condominium Law (Law No. 634) requires written consent from four-fifths of owners before you touch shared elements.

How does Turkey's 2018 earthquake code apply to my renovation?

TBDY 2018, in force since 1 January 2019, governs structural changes. A cosmetic refresh doesn't invoke it, but altering the structure means the work is assessed against current seismic standards. Chapter 15 covers existing buildings.

Can I remove an interior wall in an old Istanbul apartment?

Only after confirming it isn't load-bearing. In older stock, a plain-looking partition is often a shear (perde) wall carrying load. Removing a structural wall needs an architect, a permit, and a structural engineer's sign-off.

Should I hire an architect or a contractor?

A contractor suits a cosmetic refresh. Once scope hits structure, permits, or common areas, you need a licensed architect, because permit drawings must be signed and sealed by an architect registered in Turkey.

How do I check that an architect is properly licensed in Turkey?

Ask for the architect's registration with Mimarlar Odası (the Chamber of Architects, under TMMOB), and confirm that this named individual signs and seals your permit drawings. Verify the person, not just the firm's marketing.

How long does a full apartment renovation take?

A cosmetic refresh runs a few weeks. A structural, permitted renovation runs several months once you add design, permit processing, and sequencing. Permit times vary by municipality, so build slack into your schedule.

Is it even worth renovating an old apartment in Istanbul, or should I just buy a newer one?

Sometimes buying newer wins, if the structure is poor or the owners' board blocks the work you need. If the bones are sound and the location is right, renovating usually pays off. Still deciding? See whether to renovate or rebuild at all.