Complete Three-Room Apartment Renovation: Costs, Timelines, and Challenges

Renovating a three-room apartment (typically ranging between 70 and 90 sqm) is one of the most common yet highly complex undertakings in interior design. While it is the perfect size for family living, it involves an extensive scope of work requiring precise coordination of design, budget, and subcontractors. Most clients start with the assumption that a renovation takes a month or two and costs far less than the market reality. However, the construction site quickly refutes optimistic estimates.

A full apartment renovation is essentially a micro-industrial project. In this comprehensive guide, using data from our "three-room apartment" template on the renovationsteps.com planning platform, we break down every stage, real costs, optimal durations, and key administrative and organizational challenges.

Permits and Regulations: Steps Before Demolition

A frequent mistake is starting demolition without checking legal requirements. In the Republic of Serbia, under the Law on Planning and Construction, renovation works are divided into three main categories, which determine the administrative procedure:

1. Routine Maintenance (no permits or notifications required): Works such as painting, wall skimming, replacing tiles or flooring (parquet, laminate), replacing interior doors, and replacing electrical or plumbing fixtures/pipes along existing routes and without capacity changes fall under routine maintenance (*tekuće održavanje*). These works do not require any municipal permits or CEOP notifications.
2. Adaptation and Investment Maintenance (Article 145 Approval Decision): If you plan to remove or relocate partition walls (changing the spatial layout of the apartment) or replace external windows/doors (which affects the building's exterior appearance), these works are classified as adaptation (*adaptacija*) or investment maintenance (*investiciono održavanje*). For these, you must obtain an Approval Decision under Article 145 of the Law on Planning and Construction. The request is submitted electronically through the CEOP system using an electronic signature, and requires a technical description and bill of quantities prepared by a licensed architect or engineer, along with proof of ownership.
3. Reconstruction (requires structural engineering project): Any modification to the load-bearing structure of the building (demolishing or creating openings in load-bearing walls, columns, beams, or concrete shear walls) is classified as reconstruction (*rekonstrukcija*). These works are strictly forbidden without a detailed structural project prepared by a licensed structural engineer, a technical review of the project, and obtaining a formal approval decision under Article 145. Any unauthorized modification to load-bearing elements compromises the stability of the entire building and carries criminal liability.
4. Building Rules and Neighbors: According to building rules, you must post a notice on the building's bulletin board detailing the start date, planned duration, and contact details of the owner or contractor at least 7 days in advance. Works must be carried out outside of designated quiet hours (typically 16:00 to 18:00 and from 22:00 to 07:00, with longer periods on weekends). Contractors are required to clean shared hallways and elevators daily during dusty phases (demolition, hauling debris).

Renovation Phases and Real Costs

According to the three-room template from renovationsteps.com, the estimated budget for labor and systems is 4,560,000 RSD (approx. €39,000). This covers all professional services and core materials but excludes non-built-in furniture (sofas, beds, chairs) and appliances.

Here is a breakdown of the 20 main phases:

• Planning & Permits: 28 days | 115,000 RSD
• Demolition & Stripping: 10 days | 120,000 RSD
• Masonry & Wall Prep: 10 days | 180,000 RSD
• Electrical Rough-In: 10 days | 265,000 RSD
• Plumbing Rough-In: 7 days | 250,000 RSD
• HVAC & Heating: 10 days | 350,000 RSD
• Windows & Exterior Doors: 7 days | 420,000 RSD (plus 390,000 RSD for ALU/PVC windows)
• Plastering & Drywall: 18 days | 345,000 RSD
• Floor Screed: 28 days | 170,000 RSD (requires 28 days for curing)
• Tiling (Bathrooms & Kitchen): 14 days | 360,000 RSD (plus 207,000 RSD for tiles)
• Wall Skimming & Primer: 10 days | 120,000 RSD
• Painting: 10 days | 190,000 RSD
• Flooring (Oak Parquet): 7 days | 275,000 RSD
• Interior Doors: 5 days | 270,000 RSD
• Kitchen Assembly: 4 days | 440,000 RSD (plus 340,000 RSD custom MDF kitchen)
• Sanitary Ware Installation: 5 days | 300,000 RSD
• Final Electrical Trim: 5 days | 170,000 RSD
• Custom Wardrobes: 5 days | 280,000 RSD
• Post-Construction Deep Clean: 3 days | 55,000 RSD
• Project Handover (Punch List): 3 days | 0 RSD

Best Practices on the Construction Site

Silent Plumbing Pipes: Traditional PVC pipes propagate noise whenever water runs down the drain. To eliminate this, modern standards dictate installing silent drainage pipes (such as Geberit Silent-PP or Rehau Raupiano Plus). Their multi-layer, high-density structure and acoustic dampening clamps prevent sound waves from transferring to the walls, ensuring silence in bedrooms bordering bathrooms.

Smart Home Infrastructure: During electrical rough-ins, we recommend planning smart home features. Unlike expensive wired systems (KNX, Lutron) which exceed €15,000, we install modular smart relays (such as Shelly) integrated into a local Home Assistant server. This wireless hybrid system costs between €1,000 and €3,000 for the entire apartment. Read our comprehensive guide: Smart Home: From Concept to Reality.

Screed Curing Times: Cement floor screeds must cure for at least 28 days to drop moisture levels below 2% before wood flooring can be laid. Rushing this step is a costly mistake, causing wood to warp and buckle. If deadlines are tight, fast-curing additives or commercial dehumidifiers must be used.

Stone Worktops & Tiling: For kitchen worktops and bathroom vanities, selecting natural stone (marble, granite, quartzite) versus engineered composites (Kerrock, quartz, Dekton) is a major design and durability choice. Learn the pros and cons of each in our guide: On Choosing Stone — A Practical Guide for Architects and Clients.

Timeline Optimization: Sequential vs. Overlapping

Adding the days of all 20 phases sequentially results in 199 working days (almost 7 months). This reflects poor management. In a professionally managed project, non-dependent phases overlap. For example, while waiting for custom windows to be manufactured (15-20 days), demolition, wall preparation, and plumbing/electrical rough-ins run in parallel. The 28-day screed curing phase is used for skimming walls, installing windows, and drywall work. Thus, the actual renovation timeline is reduced to 90 to 120 calendar days (3 to 4 months).

Gantt Chart Comparison

To visualize this timeline difference, we created an interactive Gantt chart comparing the sequential and optimized paths:

Project Management & Tools

Managing over 10 different contractors through fragmented Viber groups and spreadsheets leads to errors, delays, and budget creep. The solution lies in introducing a structured project management system. At our studio, we use our own tool renovationsteps.com. This system provides:

• Clear task hierarchy: Every contractor sees exactly which tasks they need to perform, which materials they need to order, and by when.
• Transparency for the client: The client has access to a real-time dashboard showing progress, budget spent, and eliminating the need for constant phone calls and site visits.
• Dynamic Gantt chart: If the tiler is two days late laying bathroom tiles, the system automatically shifts the schedule for sanitary installation and notifies the plumber of the change.

Systematic tracking and eliminating communication noise transform the renovation process from a source of stress and uncertainty into a professionally managed and predictable project.

Note: Using the planning tool itself is completely free, while the complete, pre-configured template with all pre-set information, realistic prices, and timelines for a three-room apartment costs €29.