Architects | Renovation | Extension

Extension in Luxembourg: building new without
betraying the existing.

Contemporary extensions, architectural grafts, enlargements in continuity with or in deliberate contrast to the
existing structure. COMODO masters the technical interfaces between old and new, so that your design is realised
without compromise.

Types of Extensions COMODO Delivers for Architects

Single-Storey and Lateral Extensions

Horizontal enlargement of an existing building. We manage slab continuity, roof junction, the interface between existing and new facades, and network continuity.

Raised Extensions

Adding one or more floors to an existing building. Structural analysis of foundations and load-bearing walls, selection of the appropriate construction system, treatment of the interface between the existing roof and the new structure.

Contemporary Architectural Grafts on Heritage Buildings

These projects demand particular mastery of material and thermal interfaces between old and new, as well as coordination with heritage authorities if the building is listed.

Glazed Extensions and Architectural Verandas

We master lightweight metal framing systems, structural glazing and waterproofing interfaces with the existing building.

The Critical Interfaces COMODO Masters

Structural Junction

How does the new structure sit on the existing one? Underpinning where necessary, slab continuity or thermal bridge break, anchoring into existing walls. Every solution is validated with the structural design office.

Waterproofing at the Junction

The connection between the existing and new envelope is often the most vulnerable point of an extension. We treat this interface with certified waterproofing systems and systematic execution checks.

Thermal Continuity

The junction between old and new must not create a thermal bridge. We integrate the thermal break elements prescribed by the design office and document them with photographs.

Network Connections

Existing networks must be extended or modified to serve the extension. We map them before work begins and plan connections with the technical trades.

Frequently Asked Questions

How does COMODO verify the load-bearing capacity of foundations before a raised extension?

We commission a complete structural assessment before any price commitment. This assessment includes an analysis of existing plans, surveys where necessary and an opinion from the structural design office.

How are undocumented network discoveries managed during an extension?

Every discovery is the subject of an incident report transmitted within 24 hours. We propose a technical solution and await validation before any modification or relocation of the network.

Can COMODO carry out an extension in an occupied building?

Yes, subject to adapted phasing conditions. We establish a circulation and protection plan that allows access to and use of the existing building to be maintained during the works.

Which construction systems does COMODO recommend for extensions?

Timber frame (lightweight, fast, thermal performance), reinforced concrete (continuity with the existing structure, large spans), steel structure (glazed extensions). We discuss these options with you and the structural engineering firm from the preparation phase.

LET'S COLLABORATE

Let's talk about your architectural project.

Send us your plans or project brief. We will come back with a technical analysis and a detailed budget proposal.

Extension

Extension in Luxembourg: building new without betraying the existing.