VERTICAL SEA

What VERTICAL SEA does

VERTICAL SEA is a France-based, privately held engineering and consulting collective founded in 2021 and headquartered in Sèvres. The firm is structured as an umbrella organization combining six wholly-owned operating entities — Builders, Tecta, Sol Conseil, Soler IDE, Sennse, and Arc Alpin — into a single multi-disciplinary platform focused on territorial regeneration across the full project lifecycle (Imaginer, Concevoir, Construire, Valoriser). Its service offering spans six expertise lines: building engineering, environmental consulting, geotechnics, communication, stakeholder consultation, and urban planning, with BIM and digital services cited as part of the toolkit.

The firm serves seven vertical markets — Real Estate, Industry & Energy, Hospitality & Luxury, Territories (its primary segment, encompassing regional and local government projects), Mobility, Health & Research, and Sports & Major Events — operating exclusively in the French market. The business model is project-based professional services delivery: pricing is custom and not publicly disclosed, and revenue mechanics appear to flow through direct engagement with public authorities, developers, and private operators rather than through standardized product or subscription channels.

The company is led by founder and President Louis-Christophe Moissonnier and reports a headcount of 251–500. No funding rounds, external investors, acquisitions, partnerships, customer logos, or AI/ML capabilities are disclosed in the available source material. The collective's strategic proposition rests on cross-disciplinary integration and full-lifecycle coverage rather than proprietary technology, scale economies, or recurring revenue contracts, making it a typical mid-sized French engineering consultancy assembled via roll-up rather than a venture-backed platform.

Name

VERTICAL SEA

Website

https://vertical-sea.com

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

251–500 employees

Short description

VERTICAL SEA is a France-based, privately held engineering and consulting collective founded in 2021 that combines six specialized firms (Builders, Tecta, Sol Conseil, Soler IDE, Sennse, Arc Alpin) to deliver multi-disciplinary territorial regeneration services — building, environmental, geotechnical, communication, consultation, and urban planning — to public and private clients across seven French verticals.

Ownership category

akta.pro rank

Product category

Engineering & Multi-disciplinary Consulting Services

NAICS

Other Heavy and Civil Engineering Construction (237990)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540)

akta.pro primary industry

Project Management & Owner’s Engineering / Technical Consultancy (Spec Writing, Bid Support, Site Support) (IMAJAGAO)

Keywords

• Territorial regeneration
• Building engineering
• Environmental consulting
• Geotechnical services
• Urban development

Headquarters

HQ city

Sèvres

HQ country

France

HQ region

Europe

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Core offering

VERTICAL SEA is a French multi-disciplinary collective that delivers integrated territorial regeneration projects across the full project lifecycle. Its offering combines six service lines — building engineering, environmental consulting, geotechnical services, communication, public consultation, and urban development — through six specialist sub-brands (Builders, Tecta, Sol Conseil, Soler IDE, Sennse, Arc Alpin), structured around a four-stage approach: Imaginer, Concevoir, Construire, Valoriser.

Product overview

VERTICAL SEA is a collective of specialized entities offering territorial regeneration services. The collective comprises multiple sub-brands including Builders, Tecta, Sol Conseil, Soler IDE, Sennse, and Arc Alpin. The portfolio includes six core service offerings: building expertise, environmental expertise, geotechnical expertise, communication expertise, consultation expertise, and urban development expertise. The collective operates across six sectors: Real Estate (Immobilier), Industry & Energy (Industrie & énergie), Hospitality and Luxury (Hôtellerie et Luxe), Territories (Territoires), Mobility (Mobilités), Health and Research (Santé et recherche), and Sports and Major Events (Sport et grands événements). The company follows an approach methodology: Imaginer (Imagine), Concevoir (Design), Construire (Build), and Valoriser (Add Value).

Differentiator

Problem solved

Functional benefit

Products and services

• Building Engineering Services

Segments7 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Recent moves4 records

Expansion highlights3 records

Direct peers

• Artelia: Major French multi-disciplinary engineering consultancy offering building, infrastructure, environment, and project management services across the same construction and territorial regeneration value chain that Vertical Sea addresses.
• Egis: French-headquartered engineering and consulting group covering infrastructure, urban development, environment, and mobility, directly overlapping with Vertical Sea's primary Territories and Mobility verticals.
• Systra: French engineering firm specializing in mobility and transport infrastructure consulting, with adjacent urban planning and environmental capabilities that overlap with several of Vertical Sea's service lines.
• Tractebel (Engie): Engineering consulting arm of Engie with deep energy transition and infrastructure expertise, addressing the same Industry & Energy and environmental pain points that Vertical Sea serves.
• Setec: Independent French engineering group delivering multi-disciplinary building, infrastructure, environment, and project management services, with comparable sub-brand structure and French market focus.
• Ramboll: European engineering, environment, and sustainability consultancy with strong territorial planning and stakeholder engagement capabilities aligned to Vertical Sea's environmental and consultation expertise.
• Assystem: French engineering services firm focused on energy, infrastructure, and industrial transition projects, competing directly for the Industry & Energy mandates that Vertical Sea targets.

Broad incumbents

• WSP: Global professional services firm with a deep French presence offering environment, property, transportation, and urban planning consulting, representing a broader-incumbent competitor across most of Vertical Sea's verticals.
• Arcadis: Global design and consultancy firm with established French operations in environment, buildings, and urban development, competing for the same public and private territorial regeneration mandates.

Regional players

• Sweco: European engineering, environment, and design consultancy with strong sustainability and urban planning credentials, comparable in scope though primarily operating outside France.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries6 records

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 VERTICAL SEA