Project Technical Dossier · LASSA Architects · 2023

Thyta House

Partially hidden into the terrain, the house deploys linearly on two levels following the curvature of the mountain — overlapping volumes dissolving into a mountainous landscape of wild scrubs and olive trees above Desimi Bay, Lefkada

Typology Summer House · Commission
Completed 2023
Total Area 380 m² · 4,090 ft²
Levels Two + Studio
THYTA House aerial view · © NAARO / LASSA Architects
38°38′ N · 20°42′ E Desimi, Lefkada
Ionian Islands, GR
Total Area 380 m² · 4,090 sq ft
Bedrooms 4 + Integrated Studio
Bathrooms 4 Bespoke
Levels 2+1 Two + Studio Level
Oculi 2 Elliptical Roof Apertures
Construction CNC Offsite Formwork
00 / Statement

Architect's Statement

The site features a mountainous natural landscape covered with wild scrubs and olive trees, overlooking one of the most beautiful panoramas of the island. Designed as a retreat for a local family, the project is partially hidden into the terrain — a combination of overlapping volumes reducing the elevation as seen from the sea. The house deploys linearly on two levels following the curvature of the mountain profile.

When entering the house, one walks into a world that projects the gaze toward the ravine and the glittering lights of the sea. The curved and sinuous lines accompany the discovery little by little. A key objective of the design is to seamlessly extend the interior spaces into a multitude of outdoor living areas: the terraces, the loggia, the pool area, and the courtyard.

An elliptical concrete beam delineates the common areas of the house, while the bedroom areas are inserted within the topography on the upper floor. The living room and kitchen are spacious — conceived as a pavilion, open to all sides. The detachment of the living room from the sloping terrain allows for the creation of a courtyard garden that provides shading while emphasising views of the mountain and sky. The elliptical roof is punctured by two oculi that frame olive trees. A column-free pergola extends the shade and the framing of the sea.

The lower level integrates a studio within one of the stone retaining walls that structure the landscape. The planted roof provides protection from direct sunlight throughout the day. The living room, designed to be open on both sides, allows the refreshing northern wind to naturally ventilate the house during the evening hours.

A combination of different tones of neutral colours — various shades of blue, grey, and green — delineates the project subtly and facilitates its insertion into the surrounding landscape. The garden comprises a blend of native coastal vegetation: wild olive trees, shrubs, and small aromatic gardens, creating a captivating sensory experience.

01 / Spatial Programme

Programme

Lower Level

Studio & Landscape

Integrated studio within retaining wall
Stone retaining walls structuring the terrain
Courtyard garden entry sequence
Native planted landscape
Approach from road, semi-submerged
Ground Level

Living Pavilion

Elliptical living room & kitchen pavilion
Open-plan, column-free interior
Floor-to-ceiling sliding glass walls to terrace
Secluded courtyard garden (shade provision)
Column-free pergola with panoramic sea views
Loggia — shaded outdoor living zone
Infinity pool overlooking Desimi Bay
Two elliptical oculi in roof framing olive trees
Upper Level

Private Quarters

Hallway connecting all private rooms
Family room / lounge
Master bedroom with en-suite
Two further bedrooms
Three bespoke bathrooms
Upper garden terrace (on elliptical roof)
Direct bedroom access to roof terrace
02 / Architectural Features

Features

F.001
Elliptical Concrete Beam
The primary structural and spatial element of the house. The elliptical concrete beam defines the communal areas and gives the architecture its organic DNA — curved lines and arching forms that guide movement through the space, reading as natural within the Ionian landscape.
F.002
Elliptical Oculi
Two apertures puncture the elliptical roof of the living pavilion. Framed against the Aegean sky, olive trees are glimpsed through the openings — connecting the interior to the landscape above and bringing diffused natural light into the courtyard below.
F.003
Column-Free Pergola
A cantilever pergola extends the living area into the outdoors without structural interruption. Framing panoramic views of the Ionian Sea, the pergola disappears into the horizon line — maximising the visual connection between interior habitation and the landscape.
F.004
Secluded Courtyard Garden
The elliptical living room detaches from the slope to form an enclosed courtyard garden that provides shade during the summer heat while framing views of the surrounding mountains and sky. Acts as a climatic buffer and a spatial threshold.
F.005
Infinity Pool · Desimi Bay
An infinity-edge pool positioned on the main terrace level, with its horizon aligned to the Ionian Sea below Desimi Bay. The visual extension of the water edge into the sea reinforces the house's conceptual relationship with the coastal landscape.
F.006
Floor-to-Ceiling Glass Walls
Full-height sliding glazed walls on the terrace-facing elevations dissolve the boundary between interior living and exterior terrace. The frameless detailing ensures that the landscape — mountain, sea, and sky — becomes the primary visual element of the interior.
F.007
Roof Garden Terrace
The upper bedroom level opens directly onto a roof garden formed by the elliptical concrete roof itself. Accessible from the bedroom hallway, the roof terrace provides private outdoor space with elevated views across the mountainous Ionian landscape.
F.008
Topographic Integration
The house extends linearly on two levels following the mountain's natural curvature. From the Ionian Sea, the roofline barely distinguishes itself from the olive-covered hillside — overlapping volumes minimise the visual impact of the structure within the protected landscape.
F.009
Open Living Pavilion
The spacious living room and kitchen are conceived as a single open pavilion elevated from the sloping terrain. Flanked by the courtyard garden on one side and the pergola terrace on the other, the pavilion captures the northern breeze and frames multi-directional views.
03 / Construction

Materials

The construction of THYTA House was shaped by the challenge of realising precise elliptical geometries in a remote mountain setting. LASSA Architects developed a bespoke system of CNC-cut offsite formwork elements that were fabricated off-site with millimetre precision and assembled on-site.

This approach minimised waste on site, compressed the construction programme, and enabled the curvature of the elliptical beam and oculi to be achieved in reinforced concrete — a geometry unattainable through conventional shuttering methods.

The material palette echoes the colours of the Ionian landscape: blues, greys, and sage greens in tile, plaster, and stone. Stone retaining walls integral to the topography structure the site and merge with the natural rock outcrops.

The planted roof contributes a layer of thermal insulation while visually completing the camouflage of the structure within the hillside — the house becomes landscape.

Formwork System
CNC-cut offsite elements, bespoke to project geometry
Primary Structure
Reinforced concrete; elliptical beam section
Roof Construction
Planted / vegetated roof over concrete ellipse
Retaining Walls
Local stone; integrates with natural rock contours
Glazing System
Floor-to-ceiling sliding glass panels; minimal framing
Colour Palette
Blues, greys, and sage greens · neutral Ionian tones
Landscaping
Wild olive, aromatic coastal shrubs, indigenous species
Pool
Infinity edge, sea-facing, terraced
04 / Passive Systems

Sustainability

01 · Thermal
01
Planted Roof
The vegetated roof acts as thermal insulation, shielding the interior from direct sunlight during the hottest hours. Native coastal plants require minimal irrigation and integrate naturally into the structure, contributing to the camouflage of the house within the hillside.
02 · Climatic
02
Natural Ventilation
The open-plan living pavilion is oriented to capture the refreshing northern winds each evening. No mechanical cooling is required during the summer months, eliminating energy consumption for air conditioning in the primary living spaces.
03 · Landscape
03
Native Planting
Wild olive trees, aromatic coastal shrubs, and drought-resistant indigenous vegetation surround the house. The garden requires minimal water input, conserves soil, and provides an immersive experience of the authentic Greek island landscape.
04 · Construction
04
CNC Precision
CNC-cut offsite formwork elements reduced site waste, minimised material over-ordering, and enabled precise elliptical geometries unattainable by conventional means. Offsite fabrication also reduced on-site construction time and disturbance to the terrain.
05 / Drawings

Technical Drawings

Technical Drawing 01
Drawing 01 01
Technical Drawing 02
Drawing 02 02
Technical Drawing 03
Drawing 03 03
Technical Drawing 04
Drawing 04 04
Close  ✕
"

When entering the house, one walks into a world that projects the gaze toward the ravine and the glittering lights of the sea. The curved and sinuous lines accompany the discovery little by little.

LASSA Architects · Project Description · House Thyta, Lefkada 2023
06 / Team
LASSA Architects International architecture practice with offices in Brussels, London and Greece, founded by Dora Sweijd and Theo Sarantoglou Lalis. LASSA works across scales from furniture to urban design with an emphasis on material research and tectonic experimentation.
01
Dora Sweijd
Principal
02
Theo Sarantoglou Lalis
Principal
03
Jonathan Cheng
Project Associate
04
Raz Keltsh
Project Team
05
Jocelyn Arnold
Project Team
06
A. Litinas
Executive Architect
07
G. Bougas
Structural Engineer
07 / Location

Lefkada

GPS Coordinates 38°38′ N    20°42′ E
Settlement
Desimi, Lefkada
Region
Ionian Islands, Greece
Terrain
Mountainous; wild scrubs and olive trees
Orientation
Above Desimi Bay, east coast of Lefkada
Beach Access
10 minutes walk to Desimi Beach
Airport
50 min drive to Preveza / Aktion Airport
Sea View
Direct views of Ionian Sea / Desimi Bay
Terrace and Ionian Sea view
View towards the Ionian Sea · Desimi Bay · © The Thinking Traveller
08 / Publications

Press

Jun 2024
ArchDaily
Featured project · June 2024
archdaily.com
May 2024
Designboom
Featured project · May 2024
designboom.com
Jul–Aug 2024
EK Magazine
Issue No. 279 · July–August 2024
ek-mag.com
Jan 2025
Visual Atelier 8
Featured project · January 2025
visualatelier8.com
2024
The Pinnacle List
Featured residence · 2024
thepinnaclelist.com
Sep 2024
Arch. Art Designs
Architecture Art Designs · September 2024
architectureartdesigns.com
2024
Rodeo & 5th
Featured project · 2024
rodeoand5th.com
Jun 2024
D5 Magazine
Featured project · June 2024
d5mag.com
09 / Credits

Credits

Architect
LASSA Architects
Brussels · London · Greece
Photography
NAARO
Marcela Spadaro
Formwork Design
LASSA Architects
Offsite CNC System
Villa Management
The Thinking Traveller
Exclusive Letting
Featured By
ArchDaily · Designboom
EK Magazine · Visual Atelier 8
Featured By
ArchDaily · Designboom
EK Magazine · Visual Atelier 8