What Calista does

Calista, legally GROUPE AD2 (CALISTA), is a privately-held French bureau d'études operating from Saint-Victurnien in the Haute-Vienne department of Nouvelle-Aquitaine. Founded in 2018 under SIRET 83872093600023 with a €5,000 share capital, the five-employee firm provides construction economics consulting (Économie de la Construction), project management / maîtrise d'œuvre, and OPC (scheduling, piloting, coordination) services, with a stated specialization in écoconstruction using biosourced materials such as straw, raw earth, wood, containers, and semi-underground structures. Calista describes itself as the single point of contact that links clients with architects, thermal study firms, and construction companies.

Its service portfolio rests on three pillars: budget studies and feasibility analyses (Économie de la Construction), full project oversight from conception through delivery (Maîtrise d'Œuvre), and sustainable construction delivery (Écoconstruction). The technical backbone is a BIM-based methodology using 3D digital models (maquettes numériques tridimensionnelles) in IFC format that bind work descriptions (CCTP), quantities, estimates, and contractor bid analysis into a single model, enabling automatic updates when project changes occur. Calista holds Pro Paille certification from the Réseau Français de la Construction en Paille (RFCP), reinforcing its credibility in straw-bale construction and RE 2020-aligned sustainable building.

Calista generates revenue through professional-services fees on a quote-based model (no public pricing), with stated billing cadences of multi-year contracts for ongoing project engagements. Go-to-market is sales-led and primarily direct: the firm serves both individuals (Particuliers) and professional clients (Professionnels) including developers, contractors, municipalities, healthcare and education institutions via its Saint-Victurnien office, supported by an SEO-driven website targeting multiple French regions (Limoges, Bordeaux, Toulouse, Limousin, Nouvelle-Aquitaine, and national France). Partners include RFCP, Odéys (regional sustainable construction network), and Initiative Haute-Vienne.

Name

Calista

Legal name

GROUPE AD2 (CALISTA)

Website

https://calista-eco.fr

Company type

Private

Operating status

Operating

Headcount range

1–10 employees

Short description

Calista is a five-person French construction economics and project management bureau d'études in Nouvelle-Aquitaine, serving both individual homeowners and professional developers with eco-construction services in straw, raw earth, wood, and container building methods.

Ownership category

akta.pro rank

Product category

Construction Economics Consultancy / Eco-construction Services

NAICS

Engineering Services (541330), Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Building Information Modeling (BIM) & Digital Design Services (BPAHAKAK)

akta.pro secondary industry

Construction Program Management (Multi-site/Portfolio) (IMAFAAAF)

Keywords

• Construction economics consulting
• Eco-construction services
• Project management maîtrise d'œuvre
• Sustainable building design
• Construction budget studies

Headquarters

HQ city

Saint-Victurnien

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D

Revenue model

1. Construction Economics Consultancy: Calista provides construction economics studies, budget estimates, feasibility analyses, and project management services. Revenue is generated through professional service fees for construction economics consulting, maître d'œuvre services, and eco-construction project management.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Calista is a construction economics bureau d'études (bureau d'études en économie de la construction) that delivers budget studies, feasibility analyses, and bid management, together with maîtrise d'œuvre project oversight and écoconstruction services using alternative materials (container, raw earth, straw bale, semi-underground, wood-frame). It acts as a single point of contact connecting clients with architects, thermal study firms, and construction companies, applying BIM/3D digital modeling methodology to integrate work descriptions, quantities, and cost estimates.

Product overview

Calista is a construction economics and project management firm (bureau d'études en économie de la construction) offering a unified portfolio of services centered on three core offerings: Économie de la Construction (budget studies and feasibility), Maîtrise d'Œuvre (project oversight), and Écoconstruction (sustainable building). The company specializes in alternative ecological housing construction including container homes, rammed earth, straw bale, semi-underground, and wood-frame construction, complemented by renovation services. Their methodology leverages 3D digital modeling (BIM) integrated with cost estimation and quantity calculations. The portfolio is delivered through OPC (scheduling and coordination) services, positioning Calista as a comprehensive eco-construction partner for both residential and commercial clients across France.

Differentiator

Problem solved

Functional benefit

Products and services

• Économie de la Construction (Construction Economics)

Quantifiable outcome

• CO2 absorption of 15 kg per sq meter with straw construction

Named customers4 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Three partnerships are on record, tiered core and minor.

• RFCP (Réseau Français de la Construction en Paille)coreStrategic or Co-development PartnerRFCP is the French network for straw construction. Calista holds 'Pro Paille' certification from RFCP, demonstrating expertise in straw bale construction and natural building materials. This partnership provides Calista with recognized certification and access to network resources.
• Initiative Haute-VienneminorOthersLocal business support organization in Haute-Vienne region. Listed as a partner on Calista's website.
• OdéysminorStrategic or Co-development PartnerRegional construction and sustainable building network in Nouvelle-Aquitaine. Odéys supports eco-construction initiatives in the region.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Inddigo: Inddigo is a French consultancy focused on eco-construction, sustainable development, and biosourced materials, offering project engineering and AMO services. It is directly comparable to Calista because it serves a similar French niche of clients seeking ecological building economics and project oversight.
• Verdi Ingénierie: Verdi is a French engineering consultancy group providing construction economics, project management, and sustainable development services. It is directly comparable to Calista because it offers the same combination of maître d'œuvre and construction economics services, though at substantially larger scale.
• Alterea: Alterea is a French engineering consultancy specializing in sustainable building, energy efficiency, and eco-construction project support. It is directly comparable to Calista because it provides construction economics, project management, and energy-oriented consulting for both residential and tertiary buildings.
• Nobatek: Nobatek is a French center for eco-construction R&D and engineering services, working on biosourced materials, energy performance, and digital tools for sustainable building. It is comparable to Calista because both operate at the intersection of eco-construction expertise and digital/BIM-based delivery in France.

Broad incumbents

• Bouygues Construction: Bouygues Construction is a major French construction group offering general contracting, project management, and increasingly sustainable building services. It is comparable to Calista as a broad incumbent whose eco-construction initiatives can compete with Calista on institutional and developer-led mandates.
• Eiffage Construction: Eiffage Construction is a leading French construction firm with growing low-carbon and biosourced building offerings. It is comparable to Calista as a broad incumbent whose scale, brand, and integrated services can erode the niche positioning of small eco-construction consultancies.
• Vinci Construction France: Vinci Construction is one of France's largest general contractors and construction services groups, increasingly active in low-carbon and biosourced construction. It is comparable to Calista as a broad incumbent that can absorb construction economics and project management mandates at scale, posing a competitive threat on professional/institutional tenders.

Emerging players

• Eodd: Eodd is a French engineering consultancy specialized in sustainable development and eco-construction project support. It is comparable to Calista as an emerging niche player offering similar eco-construction and project management services, though its focus leans more toward environmental assessment than materials specialization.
• Enertech: Enertech is a French engineering firm focused on energy-efficient and low-energy building design and consulting. It is comparable to Calista because both serve eco-construction projects with technical and energy performance expertise, though Enertech is more focused on energy systems than full project economics.

Others

• Odéys: Odéys is a Nouvelle-Aquitaine regional network promoting eco-construction and sustainable building. It is comparable to Calista as an ecosystem partner rather than a direct competitor, since Calista is listed on Odéys's network and benefits from regional visibility and referrals.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights5 records

Customer concentration

• LinkedInlinkedin.com/company/groupe-ad2

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Calista