Project

M43 Thermal Renovation and Extension

- Asnières-sur-Seine, France

Thermal renovation and extension of a bourgeois house in Asnières-sur-Seine, enhancing spatial connectivity and energy efficiency.

Front view of a three-story bourgeois house with a mansard roof and a modern extension on the side.

A three-story bourgeois house with a mansard roof and a modern extension on the side.

Story

M43 Thermal Renovation and Extension

Enhancing a bourgeois house with modern efficiency

This project involves the thermal renovation and extension of an early 20th-century bourgeois house located in Asnières-sur-Seine. The extension defines the northern boundary of the plot, integrating a kitchen that seamlessly connects to both the living room and an elevated terrace. A glazed roof crowns the extension, inviting northern light and facilitating natural ventilation.

The terrace, raised to align with the house's main level, features a facade with a glass door and a sash window that ingeniously converts the kitchen worktop into an outdoor counter. Structural modifications on the ground floor enable a fluid connection between the living room and kitchen, with metal sections reinforcing the existing walls.

The first floor respects the original room layout, while the attic benefits from sarking insulation, exposing the roof structure internally. Natural zinc roofing and aluminum window frames enhance durability, and timber-framed partitions with Fermacell lining ensure robust interior walls. Green film-faced plywood is used for interior joinery, preserving the house's original volume and composition.

Design Highlights

  • Extension forms the northern boundary, housing the kitchen

  • Glazed roof for natural light and ventilation

  • Elevated terrace with outdoor counter integration

  • Sarking insulation in the attic

  • Use of natural zinc and aluminum for durability

Key Facts

Location Asnières-sur-Seine, France
Lead Architect BAST
Associate Architect EXERCICE
Area 204 m²
Completion Date September 2025
Budget €627,000 excl. VAT

The project embodies contemporary architecture through its thoughtful integration of modern materials and techniques, enhancing both the aesthetic and functional aspects of this historical residence.

Technical summary

Updated 2/8/2026

Finishes

  • interior joinery: Green film-faced plywood

Materials

  • zinc — roofing
  • aluminum — window frames
  • timber — new partitions
  • glass — glazed roof and windows

Construction / Systems

  • structural modification: Existing walls are sandwiched by metal sections that transfer the load into the existing walls.
  • insulation: Attic insulated using the sarking method, leaving the roof structure exposed.

Products

  • Not specified

Palette / Lighting

  • Colors: green
  • Lighting: natural light through glazed roof

Images

Front view of a three-story bourgeois house with a mansard roof and a modern extension on the side.
Modern house extension with sliding glass door and textured exterior wall.
Modern house extension with large glass windows and doors, outdoor counter, and greenery.
Exterior of a house featuring large windows and a zinc roof.
Interior hallway with patterned tile floor, curved staircase, and view into a room with skylight and shelves.
Interior room with large window, radiator, wooden floor, and vertical lights.
Interior detail with green wall, white light switches, light bulb fixture, metal radiator, window with metal grid, and wooden floor.
Room interior with exposed wooden beams, brick walls, a window with metal railing, and a radiator.
Bathroom with modern sink, green shelf unit, showerhead, glass partition, white tiles, and wooden ceiling beams.
Modern faucet and sink with visible plumbing components.
Kitchen interior with glazed roof, exposed brick walls, wooden floor, open shelves, and a refrigerator.
Interior of a kitchen with a glass roof, green countertops, and open shelves.
Interior kitchen with glazed roof, open shelves, and green countertop.
Detail of a glazed roof with metal beams and brickwork.
Floor plan of a house extension with room layout and garden area.
Section drawing of a house showing multiple floors, staircases, and structural details.
Detailed architectural drawing of a building extension with visible structural elements.
Architectural axonometric drawing of a three-story house with a mansard roof and terrace.
Exploded axonometric drawing of a house with components separated from the main structure.
Line drawing of a multi-story house with detailed roof and windows.
Technical drawing of a house with an extension, depicting the roof structure and layout.
Line drawing of a house with roof structure and extension.
Line drawing of a house showing roof structure and surrounding walls.
Wireframe drawing of a two-story house with roof structure and surrounding walls.
Isometric architectural drawing showing a house with detailed roof structure and terrace.
Line drawing of a house with an extended roof structure and staircase.
Isometric architectural drawing showing a house with a complex roof structure and an extension.
Line drawing of a house with a mansard roof and architectural elements.
Architectural drawing of a house with roof and facade details.
Line drawing of a house with mansard roof and extension.

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