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Heleri Koltšin
ABOUT
  1. Nortal HQ 
  2. Depowise HQ 
  3. T53 - apartment building
  4. Exhibition stands for Estonian Trademark 
  5. Kalev Brand Store – Design Competition Entry
  6. Viimsi Riviera  - apartment building
  7. Graf Zeppelin - apartments
  8. Mustjala boarding house
  9. Kuressaare day center 
  10. RMK - State Forest Managment Centre

kolchinheleri@gmail.com
Whatsapp / +37255694744 
Instagram / kolchin_

©2025 Portfolio

Nortal HQ renovation at Ülemiste City



in collaboration with LÄVI Interior Architects – Project Leads: Kersti Pilar, Kaur Vänt  / interior architects: Ann Press and Silvia Leet



The Nortal HQ renovation is the largest office project I’ve participated in, spanning four floors in Ülemiste City. 

Nortal is a multinational strategic change and technology company headquartered in Tallinn, Estonia, with operations in the UK, US, Canada, Mexico, Europe, the Middle East, and Africa.  The company provides data-driven business transformation for public and private sector clients, notably contributing to the digitalization of Estonia's governmental e-services.





The design aimed to create a functional, calm, and future-ready workspace that reflects Nortal’s core values of clarity, innovation, and human-centric digital transformation. As a global technology company with a strong presence in the public and private sectors, Nortal needed an environment that could support the dynamic nature of hybrid work, foster collaboration across teams, and offer spaces that promote focus, well-being, and flexibility. The interior architecture balances these needs by providing a variety of spatial experiences—from open-plan work zones and quiet focus rooms to informal lounges and thoughtfully designed sanitary areas—each contributing to an atmosphere that is both professional and welcoming.






The concept focused on natural tones, smart spatial organization, and custom solutions—from soft acoustics and refined lighting to bespoke furniture details and unified finishes across all floors.




I contributed to both the concept phase and technical execution, working closely with the LÄVI team and interior architects Ann Press and Silvia Leet.


MY ROLE AND RESPONSIBILITIES:

  • Contributed to concept development and material logic

  • Collaborated on technical floor plans across multiple floors

  • Created custom furniture drawings (e.g. planter zones, washbasins)

  • Produced bathroom interior elevations and detailed layouts

  • Prepared door schedules and specifications

  • Participated in team meetings and ongoing coordination

  • Gained a full overview of the main project development process within a large office in just four months

This experience greatly deepened my understanding of large-scale office planning, design documentation, and the collaborative nature of complex project workflows.

Conversion of Tartu mnt 53 Office Building into Apartments



in collaboration with LÄVI Interior Architects – Project Lead: Kristjan Urke



This project involved the complete transformation of a former office building into apartments. The process required strategic redesign, creative material reuse, and careful adaptation to the building’s original structure. The result is a bold and raw interior concept that celebrates imperfection and authenticity.





Under the guidance of Kristjan Urke, I was responsible for project management and coordination of the interior architecture development. The complexity of the project included adapting existing technical systems, preserving key structural elements, and designing fully functional residential spaces within the original office layout.




The interior concept embraces an industrial aesthetic:
  • Exposed structures, visible beams and pillars
  • Raw, imperfect surfaces: cracked and uneven walls, repaired and partially repainted or lacquered finishes
  • DIY-inspired furniture and detailing

Materials: limestone, brick, concrete, plaster, epoxy floors, painted wood/plywood, full-color MDF and laminated boards.

Color palette: nature-inspired pastels – sky blue, sunset tones, greens – providing warmth and balance to the otherwise raw textures.

Public/shared zones are designed with theatrical compositions using decorative elements, vintage design pieces, and layered materials. Flooring in common areas mixes new and old: exposed concrete, ceramic tiles, epoxy, and metal or composite grates.



Apartment interiors combine functionality with expressive design:
  • Mosaic parquet flooring creates a sense of depth and openness
  • Sanitary rooms and kitchens use contrasting elements like epoxy or ceramic tile flooring, exposed stone walls, and custom paneling
  • Practical open shelving and soft room dividers (curtains, shelving units) maintain flexibility
  • Lighting and accessories add warmth and intimacy




Each apartment balances robust structure with softness, offering a home-like feeling inside a shell that celebrates the building’s history.

Depowise HQ at Arter Quarter



in collaboration with LÄVI Interior Architects – Project Lead: Kristjan Urke, Interior Architect: Roosi Keva



This office project, located in the Arter Quarter business district, was developed to the level of a detailed technical design, including custom furniture drawings and spatial views.



The concept is rooted in Scandinavian simplicity – a calm palette of whites, beiges, and greys sets the stage for rich greenery and subtle purple brand accents. Inspired by biophilic design, the interior features natural wood surfaces and organic forms.



Rounded corners and circular details echo the brand’s visual language, while varied textures and soft shapes bring warmth and playfulness to the minimalist base.







Open workspaces are organized into zones with a focus on natural light and visual clarity. Common areas combine veneer wall panels, muted greens, and informal seating islands enhanced by plants. Meeting rooms follow a minimalist, elegant approach with Mid-century design elements. The kitchen blends cool greys with light wood and ceramic finishes, accented by violet-toned accessories. Sanitary areas continue the calm color scheme with a focus on materiality and form.

Design of Exhibition Stands for Representing Estonian Trademark and Companies at International Trade Fairs within EAS Projects


 

Exhibition Stand Designs for International Trade Fairs

in collaboration with LÄVI Interior Architects – Project Lead: Kristjan Urke

This series of exhibition stands was developed for international trade fairs to represent Estonia’s national brand across the world. The design focused on clarity, efficiency, and strong visual identity – using rental furniture and cost-effective, temporary solutions that allowed for quick installation and easy adaptation to various venues.  All documentation was prepared and delivered in English.

Each project included a full set of technical interior architecture drawings:
– Furniture layout plans
– Lighting and electrical plans
– Stand elevations
– Custom furniture drawings
– Material and product specifications


Projects:
• EAS FMB
• EAS ITS
• EAS LEAP
• EAS MONEY
• EAS ONS
• EAS SMM

Kalev Brand Store – Design Competition Entry




In collaboration with interior architect Annika Lill – Special Prize for Boldest Concept




This concept was created for the interior design competition of Estonia’s most iconic confectionery brand, Kalev. The idea was to design a space that itself becomes a layer of packaging—a striking and memorable environment that envelops the products like a foil wrapper around sweets.



The store was envisioned as a hybrid between factory, gallery, and boutique, with every surface contributing to a heightened sensory experience. The material palette was built around reflective silver (reminiscent of chocolate wrappers) and joyful yellow, creating a festive, bold, and urban atmosphere.




Furniture was designed as modular and sculptural objects—visually unified display elements with integrated storage—so that each unit resembled a product in itself. The layout included transparent candy containers, tasting zones, flexible seating/display pedestals, and a visually striking marzipan-inspired storefront window.

The project received a special prize for boldest design concept, recognizing its strong visual identity and imaginative interpretation of the brand experience.

ABOUT
  1. Nortal HQ
  2. Depowise HQ
  3. T53 - apartment building
  4. Exhibition stands for Estonian Trademark
  5. Kalev Brand Store – Design Competition Entry
  6. Viimsi Riviera - apartment building
  7. Graf Zeppelin - apartments
  8. Mustjala boarding house
  9. Kuressaare day center
  10. RMK - State Forest Managment Centre

kolchinheleri@gmail.com
Whatsapp / +37255694744
Instagram / kolchin_


©2025 Portfolio