formTL

What formTL does

formTL is a German specialty structural engineering consultancy that designs lightweight building structures and envelopes, focusing on tensioned membranes, ETFE foil cushions, glass, steel, aluminium, wood, and steel-cable systems. Founded in 2004 in Radolfzell on Lake Constance by the former IPL team and led by Managing Director Bernd Stimpfle, the firm operates from headquarters in the historic Kesselhaus building (since April 2012) with a secondary Berlin office. The company combines consulting, design, analysis, optimization, and construction-engineering services across the full project lifecycle — from feasibility studies and permitting to workshop drawings and machine-readable CNC production data — and develops proprietary form-finding and cutting software for membrane structures alongside a patented steel-shell connection node (RUCH-Knoten).

The firm's client base spans architects and general design consultants, general contractors, trade-fair builders, steel fabricators and membrane manufacturers, plus private investors and public-sector clients across more than 16 countries. Notable commissions include the Novartis Pavillon Basel media façade (with integrated organic photovoltaics and LEDs), the Mercedes-Benz multimedia installation at the Musée Rodin in Paris, the Liebherr bauma Munich trade-fair stand (13,800m², rebuilt across multiple editions), the Messe Düsseldorf south-entrance canopy (7,800m² PTFE), the Geiger Dome ETFE roof at the SMS Campus in Mönchengladbach, and the column-free glass roof at ETH Zurich's BSS research building. formTL has been certified under TÜV Rheinland's Planer-am-Bau quality standard since August 2009, is a member of DIN, and actively contributed to DIN CEN/TS 19102:2024-08, the European standard for tensioned membrane design.

The business operates on a project-based professional-services model with quote-driven pricing, no published fee schedule, and no recurring SaaS revenue. Distribution is direct — competitive tenders, architect referrals, and long-term enterprise relationships — rather than channel-based. The firm has grown organically from 10 to 24 employees over 22 years and in 2026 admitted seven additional associates, broadening ownership ahead of a planned generational transition. No external funding, acquisitions, or parent-company ownership have been disclosed.

Name

formTL

Legal name

formTL ingenieure für tragwerk und leichtbau gmbh

Website

https://form-tl.de

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

11–50 employees

Short description

formTL is a German structural engineering consultancy that designs lightweight roofs, façades, and building envelopes using membranes, ETFE, glass, and steel, serving architects, public clients, and trade-fair builders across Europe and worldwide.

Ownership category

akta.pro rank

Headquarters

HQ city

Radolfzell

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Consulting Services: Professional engineering services including consulting, design, structural analysis, optimization, and construction engineering for membrane, steel, aluminium, wood, and cable structures. Services span feasibility studies, permitting documentation, construction supervision, expert opinions, and workshop drawings.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

formTL provides structural engineering consulting, design, analysis, optimisation, and engineering services for lightweight structures, specialising in membranes, ETFE, steel, aluminium, wood, and steel cable constructions. Deliverables span feasibility studies, conceptual and detailed structural design, form-finding and load analysis, BIM-compatible 3D models, workshop drawings, CNC-ready production data, and on-site construction supervision for tensile membrane, cable, and shell structures.

Product overview

formTL is an engineering firm (ingenieure für tragwerk und leichtbau gmbH) offering structural engineering and lightweight construction services. The company provides consulting, designing, analyzing, optimizing, and engineering for structures made of membranes, steel, aluminium, wood, and steel cables, as well as building envelopes in ETFE, glass, and stainless steel mesh. Services include roofs, façades, event venues, exhibition buildings, bridges, walkways, scaffolding, structures, and sculptures in temporary, permanent, and convertible forms. The company serves private and public clients, architects, general design consultants, general contractors, manufacturers, steel constructors, trade fair construction companies, and façade and assembly firms in Germany, Europe, and worldwide.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• 22 years of successful project delivery since 2004
• +2 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

Twelve partnerships are on record, tiered core and minor.

• TensinetcoreStrategic or Co-development PartnerformTL is a partner of Tensinet, a network of companies and planners specializing in membrane construction. Managing Director Bernd Stimpfle serves as Chairman of Tensinet, working on Europe-wide quality and design standards for long-span membrane and foil constructions. Tensinet publishes a Code of Conduct and Good Practice guidelines.
• DIN (German Institute for Standardization)coreStrategic or Co-development PartnerformTL is a member of DIN and actively participates in the development of standards. The company actively contributed to DIN CEN/TS 19102:2024-08, the European standard for the design of tensioned membrane structures.
• TÜV RheinlandcoreOthersformTL is certified according to TÜV Rheinland QualitätsStandard Planer am Bau (quality management system for architects and engineers) since August 2009. Certipedia-ID: 0000021410.
• suisseplan Ingenieure AGminorStrategic or Co-development PartnerPartnership with suisseplan Ingenieure AG on the Bushof Sursee project in Switzerland, where formTL provided structural engineering and suisseplan handled general planning.
• OSMB Architekten AGminorStrategic or Co-development PartnerPartnership with OSMB Architekten AG Zürich as architect on the Bushof Sursee project.
• CanobbiominorStrategic or Co-development PartnerCollaboration with Canobbio on the membrane covering development for Abano Terme multifunctional centre, as an integral system of geometry, pretension and support.
• Ruch Metallbau AGminorImplementation/ SI/ Consulting PartnerPartnership with Ruch Metallbau AG for the ETH Zurich atrium roof project, responsible for the GU roof, fabrication and assembly of the steel shell structure.
• Display InternationalminorChannel Partner/ Reseller/ DistributorPartnership with Display International as trade fair builder for Liebherr exhibition stands at bauma Munich (multiple years).
• Kauffmann Theilig und Partner (KTP)minorStrategic or Co-development PartnerPartnership with KTP as architect for PERI trade fair stand at bauma 2019 Munich and subsequent rebuilds.
• iartminorStrategic or Co-development PartnerformTL supported iart in structural detail development and static proofs for the Novartis Pavillon media façade in Basel, designed by architect Michele De Lucchi and iart.
• PFEIFER StructuresminorImplementation/ SI/ Consulting PartnerPartnership with PFEIFER Structures for the Geiger Dome inner courtyard roofing at SMS Campus Mönchengladbach.
• Ceno Membrane TechnologyminorStrategic or Co-development PartnerPartnership with Ceno Membrane Technology for membrane fabrication on the Liebherr bauma exhibition stand.

Scale indicators6 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• Arup: Global engineering giant with significant tensile and façade engineering capabilities. Engages formTL-style projects at scale but offers integrated multi-discipline delivery that boutiques cannot match on large programmes.
• Buro Happold: Large international engineering consultancy with a dedicated lightweight/membrane team. Competes with formTL on stadium and landmark roof projects but typically as multi-discipline prime rather than membrane subconsultant.

Direct peers

• Maffeis Engineering: Italian structural engineering firm with strong portfolio in tensile membrane and cable-stayed lightweight structures. Competes with formTL on European cultural and event-venue commissions, particularly in Italy and Switzerland.
• Knippers Helbig Advanced Engineering: German structural engineering firm specializing in complex geometry, free-form structures, and lightweight/membrane design. Most direct head-to-head competitor to formTL in European premium membrane and cable-net work, with comparable profile of high-profile cultural and transport projects.
• Bollinger + Grohmann: Frankfurt-headquartered structural engineering firm with significant membrane and timber/lightweight portfolio. Overlaps with formTL on architecturally demanding façade and roof engineering, particularly for European cultural and commercial buildings.
• Schlaich Bergermann Partner (sbp): Stuttgart-based structural engineers with deep expertise in membrane, cable, and lightweight long-span structures. Comparable to formTL in German engineering pedigree, lightweight specialism, and involvement in landmark stadium and roof projects.
• Hightex GmbH: German specialist combining membrane engineering, fabrication, and erection. Overlaps with formTL on engineering content but extends into manufacturing and installation, making it both peer and adjacent competitor for design-build commissions.
• Tensys Ltd: UK-based specialist engineering consultancy dedicated to tensile and membrane structures. Closest pure-play specialist competitor; competes with formTL globally on high-end tensile roof and façade commissions.

Others

• PFEIFER Structures: Specialist in cable and tensile structures, including formTL's project partner on the SMS Geiger Dome. Adjacent ecosystem participant supplying manufacturing/fabrication know-how relevant to membrane and cable engineering.
• Ceno Membrane Technology GmbH: Membrane manufacturer and contractor that partners with formTL on projects such as the Liebherr bauma stand. Adjacent rather than directly competing — sells the manufactured membrane systems that formTL engineers — but a key participant in the same delivery value chain.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/form-tl
• Pinterestde.pinterest.com/formtl
• Facebookfacebook.com/profile.php

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 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 formTL