Gilson & associés Sas

What Gilson & associés Sas does

Gilson & associés Sas is a French landscape architecture and urban planning firm established in 1985 and headquartered in Chartres, France. The firm provides professional services to local government clients — primarily municipalities (communes), intermunicipal communities (communautés de communes), and public housing offices (offices publics de l'habitat) — across approximately 20 French departments within a 250km radius of Chartres. With a team of 8, including OPQU-certified urbanists, landscape architects DPLG, geographers, and sociologists, the firm operates under the direction of Mathieu Pichon, supported by associates Bastien Amy (aménagement pole), Arnaud Hansse (urbanisme pole), and Marie Bren-Lemeray (financial and administrative management).

The firm's portfolio is split roughly 50/50 between urban planning studies (SCoT, PLUi, PLU, carte communale) and landscape/master planning services (public spaces, parks, gardens, cemeteries, urban quarter rehabilitation). Specialized offerings include geomatic cartography, environmental and climate consulting, and public consultation/stakeholder engagement facilitation. The firm uses CAD/computer-aided design tools for project conception, alongside its core human multidisciplinary expertise. Project delivery is supported by partnerships with architecture firms (Agence Gau, ARC&A), environmental consultancies (ECOGEE), legal advisors (FIDAL), and major real estate developers (Bouygues Immobilier, Nexity, Linkcity).

Revenue is generated through professional service contracts awarded via French public procurement (marchés publics). Disclosed contract values range from approximately €150,000 for garden projects to €167,000 for PLUi studies. The firm has delivered projects for 40+ municipalities and intermunicipal communities, including Chartres, Lucé, Nogent-le-Rotrou, CdC Cœur de Beauce, CdC Cœur du Perche, and CdC Chartres métropole. The firm is independent, privately held, and not publicly traded. Effective July 1, 2025, Gilson & Associés is merging with En Perspective Urbanisme et Aménagement to form a new combined agency called OYA, broadening the service offering to cover all areas of land development for both public and private initiatives.

Name

Gilson & associés Sas

Legal name

Gilson & associés Sas

Website

https://gilsonpaysage.com

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

1–10 employees

Short description

Gilson & associés Sas is a French landscape architecture and urban planning firm founded in 1985 in Chartres, serving 40+ municipalities and intermunicipal communities across 20+ French departments with urban planning studies, public space design, and landscape architecture services. Effective July 2025, it merges with En Perspective to form OYA.

Ownership category

akta.pro rank

Product category

Urban Planning Services

NAICS

Landscape Architectural Services (54132), Landscape Architectural Services (541320), Environmental Consulting Services (54162)

SIC

Land Subdividers & Developers (No Cemeteries) (6552), Services-Management Consulting Services (8742)

akta.pro primary industry

Regional & Land Use Planning (BPAHAKAE)

akta.pro secondary industries

Landscape Architecture & Site Design (BPAHAKAC), Sustainable/Green Building & LEED Consulting (BPAHAKAG), Real Estate Development & Feasibility Advisory (Highest-and-Best-Use, Entitlements Support) (BPAJANAC)

Keywords

• Urban planning services
• Landscape architecture
• Public space design
• Territorial planning studies
• Environmental consulting

Headquarters

HQ city

Chartres

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Urban Planning Studies: Studies for urban planning covering scales from SCoT (Schéma de Cohérence Territoriale) to PLUi (Plan Local d'Urbanisme Intercommunal) and PLU (Plan Local d'Urbanisme), including carte communale. Revenue generated through professional service contracts with public sector clients.
2. Master Planning (Maîtrise d'Œuvre): Design and implementation of public spaces, parks, gardens, cemeteries, urban quarters rehabilitation, and civil engineering projects. Contracted through public procurement.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Gilson & associés Sas is a French landscape architecture and urban planning firm that delivers urban planning studies (PLU, PLUi, SCoT, carte communale) and master planning/design services for public spaces, parks, gardens, cemeteries, and urban districts. The firm's work is split roughly 50% urban planning studies and 50% master planning/landscape design, contracted through French public procurement processes for municipalities, intermunicipal communities, and public housing offices.

Product overview

Gilson & associés Sas is a landscape architecture and urban planning firm established in 1985, specializing in public space design and territorial planning. The firm operates with a balanced portfolio split between urban planning studies (50%) and design services (50%). The core offerings include urban planning studies (PLU, PLUi, SCoT), public space master planning, landscape architecture for parks, gardens, and cemeteries, geographic mapping services, environmental and climate consulting, and public participation facilitation. The company serves local government clients within approximately 250km of Chartres, France.

Differentiator

Problem solved

Functional benefit

Products and services

• Urban Planning Studies (Études d'urbanisme de planification)

Quantifiable outcome

• 40+ years of continuous operation since 1985
• +1 more outcomes

Named customers5 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Eight partnerships are on record, tiered minor.

• AGENCE GAU (Frédéric Gau)minorStrategic or Co-development PartnerArchitecture firm collaborating on joint projects as part of the firm's project development approach.
• ARC&A (Guillaume Delerive)minorStrategic or Co-development PartnerArchitecture firm collaborating on joint projects.
• BOUYGUES IMMOBILIERminorChannel Partner/ Reseller/ DistributorMajor real estate developer collaborating on development projects.
• NEXITYminorChannel Partner/ Reseller/ DistributorMajor real estate developer and property services company.
• LINKCITYminorChannel Partner/ Reseller/ DistributorUrban development company specializing in complex urban projects.
• ADENDAminorStrategic or Co-development PartnerCommerce and territorial development consultancy, collaborating on studies.
• ECOGEEminorStrategic or Co-development PartnerEnvironmental consultancy collaborating on urban planning studies requiring environmental expertise.
• FIDAL Cabinet d'AvocatsminorOthersBusiness law firm providing legal counsel on commercial matters.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Even Conseil: Even Conseil is a French urban planning consultancy specializing in territorial planning, PLUi/SCoT elaboration, and urban strategy for local governments. Comparable to Gilson in target clientele (French communes and EPCI), service offering (planning studies and project support), and OPQU-certified professional staff.
• Blezat Consulting: Blezat Consulting is a French consulting firm specializing in territorial transition, urban planning, and sustainable development for local authorities. Comparable to Gilson in B2G professional services model and sustainability-focused planning services.
• Citadia Conseil: Citadia is a leading French urban planning and territorial development consultancy serving local governments on PLU/PLUi/SCoT studies and sustainable development strategies. Directly comparable to Gilson & Associés in service mix, customer base (French municipalities and intermunicipal communities), and professional services delivery model.
• Atelier Roland Jeol: Atelier Roland Jeol is a French urban planning agency providing PLU, PLUi, and SCoT studies alongside landscape and public space design for local authorities. Comparable in scale, service mix, and customer segment to Gilson & Associés.
• Ingéo: Ingéo is a French territorial engineering and urban planning firm offering studies and project management for local governments. Comparable to Gilson & Associés in target clientele, planning study offerings, and geographic footprint in central/northern France (Arnaud Hansse previously worked at Ingéo).
• Agence Folléa-Gautier (paysage): Folléa-Gautier is a French landscape architecture firm specializing in public space design, parks, and territorial landscape studies for local governments. Comparable to Gilson & Associés in landscape architecture and public space design focus, with similar public-sector clientele.
• Plan B (urban planning consultancy): Plan B is a French urban planning consultancy serving local governments on planning documents and territorial development. Comparable to Gilson in professional services model, public-sector focus, and multidisciplinary urban planning offerings.
• Confluences: Confluences is a French urban planning and landscape architecture firm offering PLU/PLUi studies, urban project design, and public space development. Directly comparable to Gilson & Associés in professional services focus on French local governments and integrated planning/design delivery.

Broad incumbents

• Urbanis: Urbanis is a French urban planning and housing consultancy with a national presence, serving local governments on planning, housing policy, and territorial development. Comparable to Gilson in service offerings but operates at significantly larger scale with broader geographic reach.
• Citadia Ingénierie: Citadia Ingénierie is a broader territorial and urban engineering consultancy with a wider portfolio including infrastructure, environment, and planning. Comparable to Gilson in urban planning scope but operates at a significantly larger scale with a national footprint and more diversified service lines.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/gilsonpaysage

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 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 Gilson & associés Sas