Architectural Concept Design & Extension Specialists
Up to 150m² | Déclaration Préalable Experts
Navigating the French architectural landscape requires a specialized approach. We focus our core architectural services on projects within the 150m² floor area limit, specifically mastering the Déclaration Préalable (DP) process for house extensions, garage conversions, and renovations.
A Seamless Transition for Larger Projects
If your project is larger than 150m², our role doesn't stop at the drawing board. Once the Avant-Projet Définitif (APD) is validated, we leverage our exclusive network of partner architectural firms. We put you in direct relation with licensed collaborators who handle the administrative Building Permit and execution phases, while we continue to lead the Interior Design and Landscaping to ensure the original vision is executed to perfection.
Specialty
Home extensions (up to 40m² in U-zones), roof elevations, and facade changes.
Phases
Concept (ESQ), Preliminary Design (APS), and Final Design (APD).
Network
Seamless hand-off to partner firms for PC and construction oversight.
What We Do Best
Home Extensions
Expert design for house extensions up to 40m² in U-zones, maximizing your living space while respecting local regulations.
Roof Elevations
Transform your attic into functional living space through strategic roof modifications and structural planning.
Facade Changes
Comprehensive facade redesign and modernization, handling all aspects of the Déclaration Préalable process.
Design Phases
1. Concept Design
Initial concept sketches and spatial analysis. We explore your vision and translate it into preliminary architectural ideas.
- Concept sketches
- Spatial diagrams
- Initial feasibility study
2. Preliminary Design
Detailed development of the chosen concept with technical validation. Floor plans, elevations, and material palette are defined.
- Floor plans
- Elevations
- Material board
- 3D renders
3. Final Design
Complete architectural documentation ready for permit submission. All technical details are finalized and coordinated.
- Technical drawings
- Permit documents
- Specifications
- Cost estimation
Frequently Asked Questions
If your total floor area after work exceeds 150m², a licensed architect is mandatory for the Building Permit. We handle the design and connect you with the right partners for the permit.
Absolutely. While a partner firm handles the structural permit, we stay on as your Interior and Landscape designers to ensure a high-end finish.
Yes, for all projects within the DP limits, we manage the entire administrative dossier from start to finish.
The timeline varies by project complexity. ESQ phase takes 2-3 weeks, APS 3-4 weeks, and APD 4-6 weeks. Administrative approval for DP takes 1-2 months after submission.
We primarily serve the Paris region and surrounding departments, with a focus on projects in urban planning zones (U-zones) where we have extensive experience with local regulations.
Yes, we provide detailed cost estimates at the APD phase, based on current market rates and specifications. This helps you plan your budget accurately before moving to construction.