Ithaque

What Ithaque does

Ithaque SAS is a Paris-headquartered French thermal engineering firm (bureau d'étude thermique) operating since 2021 as a private SAS (RCS Paris n°898 532 833, share capital €15,045.50) under President Baudouin Mallard de la Varende. The company provides end-to-end energy renovation advisory services for individual homeowners and housing co-ownerships (copropriétés), holding RGE certification from OPQIBI and the official Mon Accompagnateur Rénov' (MAR) designation required to access French government subsidy programs including MaPrimeRénov'. Its service portfolio spans energy audits (Audit énergétique), humidity and summer-comfort diagnostics, projected DPE, project management oversight (AMO, MOE), preliminary work declarations (DP), and for co-ownerships, the newly mandatory DPE collectif, Diagnostic Technique Global (DTG), and Projet de Plan Pluriannuel de Travaux (PPPT). The firm has completed 2,600+ audits and reports an average 3-class energy-label improvement and a 3x reduction in energy bills across completed client projects.

Ithaque's technology foundation centers on Argos, a proprietary energy audit software platform developed in-house, and a 3CL 2026 DPE simulation engine adapted to the new French calculation methodology. A free public-facing DPE simulator on the website serves as a lead-generation funnel into paid engagements. The firm operates a multi-channel GTM combining direct phone sales, organic SEO across 14 regional landing pages, an educational blog, LinkedIn/Instagram presence, an email newsletter, and a referral program paying €100 to referrers and €50 to referred customers. Construction execution is delivered through a core partnership with Télémaque, allowing Ithaque to function as the audit/planning layer in an end-to-end renovation offer. Revenue is generated entirely through professional services fees (quote-based), with PPPT pricing disclosed at €1,500-€2,500 for co-ownerships under 10 lots and €3,000-€5,000 for 20-50 lots. Adjacent revenue lines include the Ithaque Académie B2B training platform and the Ithaque Pro professional services sub-brand.

Name

Ithaque

Legal name

ITHAQUE SAS

Website

https://ithaque-renovation.fr

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

11–50 employees

Short description

Ithaque is a Paris-based, RGE-certified French thermal engineering firm providing energy audits, renovation accompaniment (MAR), and co-ownership diagnostics (DPE collectif, DTG, PPPT) to individual homeowners and copropriétés across 14 French regions, supported by its proprietary Argos audit software.

Ownership category

akta.pro rank

Product category

Thermal Engineering Services

NAICS

Building Inspection Services (541350), Testing Laboratories and Services (541380)

SIC

Services-Testing Laboratories (8734)

akta.pro primary industry

Third-Party Certification, Code Compliance & Regulatory Inspection (ASME/API/ISO) (EUAEAHAN)

Keywords

• Thermal engineering services
• Energy renovation consulting
• Building energy audits
• Co-ownership diagnostics
• Energy performance certificates

Headquarters

HQ city

Paris

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, Infrastructure

Revenue model

1. Energy Audits (Audit énergétique): One-time energy audit services for individual homeowners and co-ownerships, including moisture pathology analysis and summer comfort diagnostics. The company has completed over 2,600 energy audits.
2. Mon Accompagnateur Rénov' (MAR): Ongoing accompaniment service through the renovation project, from initial study through to end-of-work visit and DPE certification. Includes aid filing assistance for MaPrimeRénov' and other government subsidies.
3. Assistance à Maîtrise d'Ouvrage (AMO): Client assistance service for project management oversight during renovation work.
4. Maîtrise d'Oeuvre (MOE): Full project management and oversight service for renovation execution.
5. Déclaration Préalable de Travaux (DP): Preparation of preliminary work declarations required for renovations that modify the exterior appearance of a dwelling.
6. DPE Collectif: Collective energy performance diagnostic for co-ownership buildings, mandatory since January 2026 for all co-ownerships.
7. Diagnostic Technique Global (DTG): Comprehensive technical diagnostic service for co-ownerships covering technical, energy, and heritage dimensions with 10-year work projections.
8. Projet de Plan Pluriannuel de Travaux (PPPT): Multi-year work plan development service for co-ownerships, mandatory for buildings over 15 years old. Pricing ranges from 1,500€ to 2,500€ for co-ownerships under 10 lots, and 3,000€ to 5,000€ for 20-50 lots.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels6 records

Core offering

Ithaque is a French thermal engineering firm (bureau d'étude thermique) that delivers energy audits, renovation planning, and project oversight for individual homeowners and housing co-ownerships across France. Services span energy audits, moisture and summer comfort diagnostics, projected DPE, full project management (MOE/AMO), Mon Accompagnateur Rénov' (MAR) accompaniment, prior work declarations, and mandatory co-ownership diagnostics (DPE collectif, DTG, PPPT). The firm operates with proprietary Argos audit software and is RGE-certified by OPQIBI.

Product overview

Ithaque is a thermal engineering firm (bureau d'étude thermique) offering a comprehensive suite of energy renovation services for individual homeowners and co-ownership buildings. The core portfolio includes energy audits (Audit énergétique), renovation accompaniment (MAR, AMO, MOE), technical diagnostics (humidity, summer comfort), and administrative services (DP filings). For co-properties, services extend to DPE collectif, DTG, and PPPT. The company also provides proprietary software tools including Argos (energy audit software) and a DPE simulator. Professional training is offered through Ithaque Académie.

Differentiator

Problem solved

Functional benefit

Brands

• Argos: Proprietary energy audit software developed by Ithaque
• Ithaque Pro
• Académie Ithaque

Products and services

• Audit énergétique (Energy audit) Comprehensive energy audit conducted by certified RGE thermal engineers that identifies heat loss, recommends up to 3 modular renovation scenarios, and helps optimize the renovation budget for individual homeowners.
• Mon Accompagnateur Rénov' (MAR) Government-subsidized end-to-end renovation accompaniment service from initial audit through project completion, including administrative assistance for MaPrimeRénov' and other aid applications, targeted at eligible individual homeowners.
• DPE projeté (Projected DPE) Projected Energy Performance Certificate that estimates the future energy rating of a property after planned renovation works.
• Diagnostic confort d'été (Summer comfort diagnostic) Diagnostic service that identifies overheating risks and recommends thermal solutions to keep homes habitable during heatwaves.
• Diagnostic humidité (Humidity diagnostic) Moisture pathology analysis to detect moisture-related issues affecting building health and occupant wellbeing, with remediation guidance.
• Maîtrise d'œuvre (MOE) Full project management mission overseeing renovation works from conception through completion.
• Assistance à maîtrise d'ouvrage (AMO) Technical and administrative assistance to the project owner throughout the renovation project, available to both individual homeowners and co-ownerships.
• Déclaration préalable de travaux (DP) Preparation of prior declarations of works required for renovations that modify the exterior appearance of a dwelling.
• Audit énergétique copropriété Energy audit service tailored for co-ownership buildings, providing detailed renovation scenarios and energy performance improvement plans for shared properties.
• DPE collectif Collective Energy Performance Certificate for co-ownership buildings assigning energy ratings from A to G, mandatory since January 2026 for all copropriétés.
• Diagnostic Technique Global (DTG) Comprehensive technical diagnostic for co-ownerships covering technical, energy, and heritage dimensions with 10-year work projections.
• Projet de plan pluriannuel de travaux (PPPT) Multi-year work plan service for co-ownerships, mandatory for buildings over 15 years old, planning maintenance and renovation works over a 10-year horizon. Priced at €1,500-€2,500 for under 10 lots and €3,000-€5,000 for 20-50 lots.
• Argos energy audit software Proprietary energy audit software platform developed by Ithaque for conducting thermal analysis and generating renovation recommendations; primarily used internally by Ithaque's thermal engineers.
• Simulateur DPE Free online DPE estimator tool using the new 3CL 2026 method to estimate property energy ratings and generate leads.
• Ithaque Académie Professional training programs for industry practitioners on energy renovation topics offered through the Académie Ithaque platform.

Quantifiable outcome

• 2,600+ energy audits completed successfully by Ithaque's thermal engineering team
• +3 more outcomes

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

Feature3 records

Partnerships

One partnership is on record.

• TélémaquecoreChannel Partner/ Reseller/ DistributorTélémaque is Ithaque's construction works partner ('Notre partenaire travaux Télémaque'). While Ithaque focuses on thermal studies and renovation planning, Télémaque handles the actual renovation construction work, enabling a complete end-to-end service for clients from audit through to completed works.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• Hello Watt: Digital-first French energy renovation platform combining audit, advisor matching and works execution. Comparable to Ithaque on the homeowner energy renovation journey, but with a marketplace/software-led model rather than a thermal engineering firm model.
• Effy: French energy renovation marketplace that connects homeowners to certified RGE artisans and supports subsidy filings. An emerging player with partial overlap to Ithaque on subsidy-driven energy renovation demand, particularly in the homeowner segment.

Direct peers

• ALTEREA: French BET thermique and energy renovation consultancy offering energy audits, AMO/MOE services and co-ownership diagnostics. Closest direct competitor to Ithaque in the same product category, with overlapping service lines and the same French regulatory dependency.
• AC Environnement: National French DPE and building diagnostics provider, including DPE collectif, DTG, and lead/asbestos/amiane diagnostics. Overlaps with Ithaque on the regulatory diagnostic side of the co-ownership offering, with a broader national footprint.
• Inddigo: Sustainable building and energy transition consultancy active in France, providing thermal studies, energy audits, and project management for renovations. Directly comparable to Ithaque on engineering-led energy advisory for both individual and co-ownership clients.
• Pouget Consultants: French thermal engineering firm (BET thermique) specialising in energy audits and building performance for residential and co-ownership clients. A direct peer in the thermal study and energy audit category serving the same customer base as Ithaque.
• BTP Consultants: French building diagnostics and technical advisory firm offering DPE, DTG, PPPT, and energy audits. Comparable to Ithaque in the co-ownership diagnostic and inspection service lines, with similar regulatory positioning (RGE).

Broad incumbents

• Bureau Veritas: Global testing, inspection and certification (TIC) incumbent with a French building services practice including DPE and technical diagnostics. Overlaps with Ithaque on regulatory inspection/certification but operates as a much larger, diversified TIC player rather than a renovation-focused specialist.
• SOCOTEC: Major French TIC group offering building diagnostics (DPE, DTG, amiante, plomb) and technical controls. A broad incumbent that competes with Ithaque in regulatory building inspections while serving a much wider portfolio of compliance and asset integrity services.
• Apave: Large French TIC firm providing building inspection, technical control, and energy diagnostic services. Comparable to Ithaque on the building diagnostic / regulatory inspection theme, but as part of a broad industrial and infrastructure TIC portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/ithaque-renovation
• Instagraminstagram.com/ithaque_renovation
• Facebookfacebook.com/profile.php

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Ithaque