Temelion

Cover Block

Company	Temelion
Tagline	AI platform automating pre-construction workflows for building design engineers
Headquarters	Paris, France
Founded	2025
Stage	Seed
Business Model	SaaS
Industry	Proptech
Technology	AI / Machine Learning
Geography	Western Europe
Growth Profile	Venture Scale
Founding Team	Co-Founders (3+)
Funding Label	Seed (total disclosed ~$3,760,000)

Links

• Website: https://www.temelion.ai/
• LinkedIn: https://www.linkedin.com/company/temelion/

The Short Version

Temelion is an early-stage automation platform for building design engineers, a niche that has attracted a €3.2 million seed round from a syndicate of European venture firms [tech.eu, September 2025]. Founded in 2025, the company targets the repetitive, document-heavy pre-construction phase, aiming to free engineers from administrative tasks like technical documentation and bid assessments [Startup Intros, 2025]. Its differentiation is proposed through trade-specific workflows for Mechanical, Electrical, and Plumbing (MEP) systems [tech.eu, September 2025].

The founding team consists of three serial entrepreneurs [Welcome to the Jungle, 2025]. Capital from the September 2025 round is earmarked for commercial expansion in the French market and further product development [tech.eu, September 2025]. The immediate watchpoint is the transition from product development to commercial validation, specifically the securing and public disclosure of initial pilot customers within the target engineering consultancies.

Data Accuracy: YELLOW -- Core funding and product claims are confirmed by company and press sources; team background and traction details have limited public corroboration.

Taxonomy Snapshot

Axis	Classification
Stage	Seed
Business Model	SaaS
Industry / Vertical	Proptech / Construction Technology
Technology Type	AI / Machine Learning
Geography	Western Europe (France)
Growth Profile	Venture Scale
Founding Team	Co-Founders (3+)
Funding	Seed (~$3.8M disclosed)

The Company in Brief

Temelion emerged in 2025 as a Paris-based AI startup, founded by three serial entrepreneurs to address a specific, document-intensive pain point in building engineering [Startup Intros, 2025]. The company operates from Station F in Paris, with its CEO, Rodolphe Héliot, based in Toulouse [LinkedIn (Rodolphe Héliot), 2026] [tech.eu, September 2025].

In September 2025, Temelion closed a €3.2 million (approximately $3.52 million) seed round led by 360Capital [tech.eu, September 2025]. The round included participation from ISAI Build Venture, SE Ventures, and Kima Ventures [tech.eu, September 2025] [ISAI, 2025]. Headcount is reported in the 1-10 employee range as of 2025 [PitchBook, 2025].

Data Accuracy: YELLOW -- Company details and funding confirmed by multiple sources; headcount and founding narrative rely on single or lower-confidence reports.

What They Have Built

Temelion's product automates repetitive, document-heavy tasks that occur before construction begins, focusing on workflows for mechanical, electrical, and plumbing (MEP) engineering trades [tech.eu, September 2025]. This includes generating technical documentation, conducting initial bid assessments, and comparing potential contractors [tech.eu, September 2025]. The company's stated goal is to free engineers from this administrative load [Startup Intros, 2025].

The product is described as an AI platform. Integration with industry-standard design and project management tools is cited as a planned use of capital [tech.eu, September 2025]. The team's composition, with a dedicated Chief Technology Officer and several engineers listed on LinkedIn, points to an in-house development focus [LinkedIn, 2026].

Data Accuracy: YELLOW -- Product claims are consistent across press releases and third-party summaries, but lack technical depth or customer validation.

Market Size and Demand

The global construction industry is valued at over $10 trillion [Statista, 2024]. The adjacent market for construction management software was valued at approximately $11.5 billion in 2023 and is projected to grow at a compound annual rate of 8.8% through 2030 [Grand View Research, 2024].

Demand is driven by persistent industry inefficiencies. Engineering consultancies face intense margin pressure from fixed-fee contracts and rising labor costs. The pre-construction phase is particularly laborious, with a significant portion of an engineer's time consumed by repetitive administrative tasks [tech.eu, September 2025].

Metric	Value
Global Construction Industry Value (2024)	10.0 $T
Construction Management Software Market (2023)	11.5 $B
Projected CAGR (2024-2030)	8.8 %

Data Accuracy: YELLOW -- Market sizing is based on third-party industry reports for analogous sectors; specific TAM for pre-construction engineering automation is not publicly quantified.

Who Else Is Fighting for This

Temelion enters a construction technology market where automation is often layered onto existing software ecosystems. The competitive map for pre-construction engineering software is fragmented. Incumbent design platforms like Autodesk's Revit suite and Nemetschek's solutions dominate the core design and modeling layer. Challengers include project management platforms like Procore and PlanGrid, which have expanded from field coordination into document management.

Temelion's initial defensible edge appears to be its narrow focus on trade-specific deliverables (Mechanical/HVAC, Electrical, Plumbing) within the pre-construction phase [tech.eu, September 2025]. The company's most significant exposure is its lack of integration with the established design and project management platforms that serve as the system of record for its target customers.

Data Accuracy: YELLOW -- Competitive positioning inferred from product description; no direct competitor names are publicly cited.

Opportunity

If Temelion successfully automates the manual, document-heavy pre-construction phase for building engineers, it could capture a significant wedge of the multi-billion-dollar construction software market.

Scenario	What happens	Catalyst	Why it's plausible
Land-and-expand within major European consultancies	Temelion starts with automating a single trade (e.g., HVAC) within a large engineering firm, then expands across all mechanical, electrical, and plumbing (MEP) disciplines.	Securing a flagship customer from the top tier of French or German engineering consultancies.	The product is explicitly built to handle trade-specific deliverables across MEP disciplines [tech.eu, September 2025].
Become the embedded AI layer for incumbent design software	Temelion's AI workflows are adopted as a value-added module or through a strategic partnership with a major software vendor.	A partnership or integration announcement with a company like Autodesk (Revit), Nemetschek, or Bentley Systems.	The startup's focus on streamlining pre-construction workflows positions it as a complementary tool [tech.eu, September 2025].

Data Accuracy: YELLOW -- The core product description and funding details are confirmed by multiple sources. The growth scenarios and potential outcomes are logical extrapolations based on the company's stated focus and investor base, but lack public validation from customer case studies or partnership announcements.

Sources

1. [tech.eu, September 2025] Temelion brings in €3.2M to streamline pre-construction with AI | https://tech.eu/2025/09/16/temelion-brings-in-eur32m-to-streamline-pre-construction-with-ai/
2. [Startup Intros, 2025] Temelion: Funding, Team & Investors | https://startupintros.com/orgs/temelion
3. [PitchBook, 2025] Temelion 2025 Company Profile: Valuation, Funding & Investors | https://pitchbook.com/profiles/company/791574-31
4. [Crunchbase, 2025] Temelion - Crunchbase Company Profile & Funding | https://www.crunchbase.com/organization/temelion
5. [Temelion, 2025] [Press Release] Temelion Raises €3.2Mn in Seed Funding | https://www.temelion.ai/blog-post/press-release-temelion-raises-eu3-2mn-in-seed-funding-to-simplify-building-engineering-workflows-with-ai
6. [Welcome to the Jungle, 2025] Temelion: photos, vidéos, recrutement | https://www.welcometothejungle.com/en/companies/temelion
7. [Tracxn, 2025] Temelion - 2026 Funding Rounds & List of Investors | https://tracxn.com/d/companies/temelion/__oW3UGGglpnvdcPsUicAU-XvKJOuLxqghIBbQS-yJFpw/funding-and-investors
8. [LinkedIn, 2026] Rodolphe Héliot - Temelion | LinkedIn | https://www.linkedin.com/in/rodolphe-heliot/
9. [LinkedIn, 2026] Sebastien Gilles - Greater Paris Metropolitan Region | Professional Profile | LinkedIn | https://www.linkedin.com/in/sgilles/
10. [ISAI, 2025] TEMELION LÈVE 3,2 M€ POUR SIMPLIFIER LA CONCEPTION DU BÂTIMENT GRÂCE À L’IA | https://www.isai.fr/news/temelion-lve-32-m-pour-simplifier-la-conception-du-btiment-grce-lia
11. [RocketReach, 2026] Jérome Joaug Email & Phone Number | Temelion Co-fondateur et Chief Product Officer Contact Information | https://rocketreach.co/jerome-joaug-email_5071980
12. [Statista, 2024] Global construction industry value | https://www.statista.com/statistics/273391/global-construction-spending/
13. [Grand View Research, 2024] Construction Management Software Market Size Report, 2024-2030 | https://www.grandviewresearch.com/industry-analysis/construction-management-software-market