Villa Renovation and Shell & Core Villas in Istanbul: The Definitive 2026 Guide
Buying a villa is one of the most sought-after routes into Istanbul property. But the purchase is the beginning of the process, not the end. Villas are either delivered as shell & core, meaning the interior is built from scratch, or acquired as existing structures requiring full renovation. Either way, what follows is a multi-disciplinary project running across several months.
This guide is written for property owners who have bought, or are planning to buy, a villa in Istanbul. It explains where the process should begin, which decisions must be made in which order, how Istanbul's premium villa districts differ from one another, and what actually shapes the budget.
Two Starting Points: Shell & Core or Existing Structure
Villa projects in Istanbul fall into two categories, and this distinction determines the entire process.
Shell & core villa. The structural frame, exterior envelope, windows and main staircases are complete. What is missing: internal partitions, the end-user portion of electrical and mechanical infrastructure, floor finishes, kitchen, bathrooms, built-in furniture and lighting. This delivery model is common in newer villa developments such as Zekeriyaköy, Demirciköy, Riva and Göktürk. In Turkish it is sometimes referred to as "natamam".
Existing structure villa. The previous owner's infrastructure and interior remain in place. How much of it is usable depends on the building's age and maintenance history. In villas older than ten years, the majority of mechanical and electrical systems typically requires replacement.
Shell & core gives complete design freedom but places the full infrastructure cost on the buyer. An existing villa allows faster occupation, though how much can be retained depends on technical survey. Most international buyers prefer shell & core, because it allows the home to be designed around their own way of living from the ground up.
For the technical definition and scope of shell & core work: [What Is Shell & Core? How Bare-Delivery Spaces Are Completed](https://www.sonraki.com.tr/shell-core-fit-out-turkey)
Why the Process Begins with Planning, Not Decoration
The most common mistake in villa projects is moving straight to style and decoration decisions. The professional approach begins with a different question: not "how will this house look" but "how will this house be lived in".
Every family lives differently: intensity of daily use, culture of hosting guests, need to work from home, position of service areas, the relationship between garden and interior. Design decisions taken before these are settled inevitably change during construction, and every change costs both time and money.
1. Needs Analysis and Living Scenario
The foundation of the project. Not the number of rooms, but living patterns: daily circulation, the balance between private and shared spaces, storage requirements, organisation of service and technical areas. The aim is to turn a plan from an architectural diagram into a real living structure.
Once planning is settled, the concept develops: spatial functions, volumetric relationships, staircase and circulation solutions, use of natural light, material language. In villa projects the concept is not purely aesthetic; it determines the long-term quality of use.
2. Spatial Planning and Interior Concept
Once planning is settled, the concept develops: spatial functions, volumetric relationships, staircase and circulation solutions, use of natural light, material language. In villa projects the concept is not purely aesthetic; it determines the long-term quality of use.
3. Technical Infrastructure Decisions
The most critical stage in shell & core villas. Electrical infrastructure, smart home systems, mechanical and climate solutions, underfloor heating, ventilation and lighting infrastructure are all planned here.
These decisions must be taken alongside the design, not after it is complete. Every change made after walls are closed means undoing finished work.
4. Technical Documentation and Detail Drawings
The stage at which design becomes buildable. Construction drawings, detail drawings, material schedules and quantity take-offs are produced. This is the single most effective step in reducing on-site surprises; in projects prepared without implementation experience, problems typically surface exactly here.
More on technical documentation scope: [Interior Design and Implementation](https://www.sonraki.com.tr/interior-design-implementation-turkey)
5. Budget Confirmation and Prioritisation
Budget is often discussed at the wrong stage in villa projects. A realistic budget emerges after design decisions are settled, quantities are measured and technical standards are defined. This sequence ensures investment is directed to the right elements.
6. Construction and Project Management
Villa implementation requires several disciplines working simultaneously: construction works, mechanical systems, joinery production, natural stone and specialist surface applications, lighting installation. Where coordination is weak, trades wait on each other or completed work is redone.
The design and build approach, where design and construction sit within one team, removes this risk: [What Is Turnkey Interior Architecture?](https://www.sonraki.com.tr/complete-projects-design-build)
7. Custom Production and Final Details
This is the stage that separates villa projects from standard housing: bespoke kitchens, staircase design, large-scale built-in joinery, specialist surfaces and natural stone. When these elements are not planned at the outset, they create problems in both programme and budget.
On custom production scope and the Turkish manufacturing advantage: [Custom Interior Production and Supply](https://www.sonraki.com.tr/custom-interior-production-supply)
Istanbul's Premium Villa Districts and How They Differ
The cost and conduct of a villa project in Istanbul varies significantly by district. Building management procedures, contractor accreditation requirements, permitted working hours and material logistics differ in each area.
European Side
Zekeriyaköy and Demirciköy (Sarıyer). Istanbul's most established premium villa address. Forest-set communities with generous plots. Building management approval procedures are rigorous; many developments require contractor accreditation and insurance documentation. Demirciköy holds a higher concentration of newer, larger-plot shell & core villas. Approval and logistics requirements can add 10-15% over standard Istanbul averages.
Kemer Country, Göktürk and Kemerburgaz (Eyüpsultan). Villa communities established since the 1990s. Two project types coexist here: older villas requiring complete renovation, and newer shell & core developments. Proximity to the city centre offers a logistics advantage.
Etiler, Ulus and Levazım (Beşiktaş). Urban villa and low-rise residential fabric. The principal challenge here is not space but access: narrow streets, limited parking, neighbour relations and municipal working-hour restrictions all directly affect the programme.
Asian Side
Acarkent, Beykoz Konakları and Riva (Beykoz). The most established villa communities on the Asian side. In Acarkent most projects are renovations; around Riva, new shell & core deliveries dominate. Distance from the city centre requires more disciplined planning of material logistics and site management.
Ömerli, Çekmeköy and Alemdağ. Developing villa districts. At the same specification level, costs are typically 10-15% more competitive than European-side equivalents, driven mainly by supplier and labour pricing.
Kandilli, Çengelköy and the Bosphorus line (Üsküdar). Historic fabric and plots facing the Bosphorus silhouette. Listed building status, silhouette protection and municipal approval processes may apply here; the project programme must be planned around these permit timelines.
For our district-specific project experience and the technical processes encountered:
Villa Project Budgets: Realistic Ranges
Villa cost cannot be expressed as a single figure. Floor area, specification level, technical infrastructure scope and the proportion of custom production are the four main variables. The per-square-metre ranges below are reference figures drawn from completed Sonraki Architecture projects.
Standard specification: approximately €500 – €700 / m²
Premium specification: approximately €700 – €1,200 / m²
Ultra-luxury (rare marble, imported fixtures, extensive bespoke production): €1,200 / m² and above
In shell & core villas, costs sit at the upper end of each band even at the same specification level, because all electrical, mechanical and infrastructure work is built from scratch. In existing-structure renovations, the proportion of retainable infrastructure brings the figure down.
For total budget tables by project type, hidden cost items and budget optimisation tactics: [House Renovation and Interior Cost in Istanbul: 2026 Pricing Guide](https://www.sonraki.com.tr/insight-villa-cost-2026)
The Most Common Mistakes
Starting design before infrastructure decisions. When aesthetic choices are settled and mechanical planning is deferred, finished work has to be undone.
Delaying electrical and mechanical planning. Every intervention after walls are closed grows disproportionately in both cost and programme.
Budgeting for decoration only. Furniture, lighting and textiles can account for 20-40% of total villa cost; this item is routinely underestimated.
Uncoordinated teams working separately. Managing architect, contractor, joiner and supplier independently turns to chaos at villa scale.
Insufficiently resolved construction details. In projects without detail drawings, decisions are made on site, in haste, and usually incorrectly.
A detailed analysis of common renovation mistakes: [Apartment Renovation in Istanbul – A Guide for Foreign Property Owners](https://www.sonraki.com.tr/insight-renovation-istanbul)
If You Live Outside Istanbul
A significant share of villa projects are delivered while the owner is not resident in Istanbul. For Turkish nationals living abroad, investors whose travel prevents regular site presence, and international buyers who have acquired property in Turkey, the process can be managed remotely.
In this model, all design presentations, material selections and approvals run through structured video meetings and digital presentations. Site supervision, supplier coordination and building management approvals are handled by the project manager. The owner receives weekly photographic reports and can request a live video walkthrough at any stage.
Frequently Asked Questions
Is buying a shell & core villa a good idea?
Yes. Because the space can be designed entirely around the user, it produces a more considered home in the long term. In return, the full infrastructure cost sits with the buyer and the process takes longer.
How long does a villa project take in Istanbul?
Depending on size and scope: renovation of an existing structure typically takes 3-5 months, shell & core completion 5-7 months. Larger properties or projects with extensive custom production can extend to 8-12 months.
How much does a shell & core villa project cost?
Reference ranges are approximately €500-700/m² at standard specification and €700-1,200/m² at premium specification. In shell & core villas, costs sit at the upper end because all infrastructure is built from scratch. The real budget becomes clear once technical design is complete.
Can I commission construction only if I already have a design?
Yes. An existing design can be assessed technically and implementation with project management provided as a standalone service. Buildability is reviewed first; where necessary, detail drawings are completed.
Who handles building management approvals?
Building management approvals, working-hour permissions, lift and logistics planning and contractor accreditation documentation are handled by us as part of project management. In premium villa developments this process can take 2-8 weeks, so it is built into the programme from the outset.
Can I manage a villa project from abroad?
Yes. A significant proportion of projects are delivered while the owner is overseas. Weekly photographic reports, video walkthroughs and structured approval meetings keep the process fully visible.
Who Is This Guide For?
Property owners who have bought, or plan to buy, a villa in Istanbul
Investors taking delivery of a shell & core villa and starting the process
Families planning a complete renovation of an existing villa
Buyers preparing budgets for projects in premium villa districts
Owners living abroad who will manage the project remotely
This guide is based on Sonraki Architecture's implementation experience in shell & core villa and high-segment residential projects since 2014. Completed residential work: [Residential Projects](https://www.sonraki.com.tr/residentialprojects)
About Sonraki Interior Architecture
Sonraki Interior Architecture provides design and build services for villas, apartments, offices and commercial interiors.
With offices in Istanbul and London, the studio works with international clients on residential and commercial projects across Turkey and internationally.
You can check a residential projects of Sonraki:
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Istanbul, Turkey