InPlan Ingenieure GmbH

What InPlan Ingenieure GmbH does

InPlan Ingenieure GmbH is an Austrian engineering consultancy (Ingenieurbüro) headquartered in Vienna's 3rd district (Landstraße), founded in 1969 as RAAB-ENGINEERING GMBH and later rebranded to emphasize its integrated planning philosophy. The firm provides B2B engineering planning and monitoring services across two core disciplines: building physics (Bauphysik) — covering thermal protection, moisture protection, sound protection, summer suitability, and air pollutants — and building services (Gebäudetechnik) — covering heating, cooling, ventilation, sanitary (HKLS), electrical engineering, and energy planning. The company combines these disciplines into a single integrated team, enabling holistic, energy-efficient building concepts for new construction and renovation, with a focus on renewable energy systems (heat pumps, solar thermal, photovoltaics, district heating), KNX building automation, and energy accounting. Underlying technology includes BIM-based 3D-CAD workflows for integrated building modeling, KNX-Bus automation, EWS simulation software (from partner Huber Energietechnik AG) for deep bore heat exchanger design, and MSRL (measurement, control, regulation) management systems for post-construction monitoring.

The firm operates on a project-based professional services model with individually quoted engagements, 30-day payment terms, and standard B2B engineering bureau terms (Fachverband Ingenieurbüros AGB). Acquisition is sales-led through direct engagement, professional network referrals, and public tender participation. Customer segments span residential developers and owners, commercial and office building clients, government and public sector (including ministries, schools, and cultural institutions such as Tiergarten Schönbrunn), and special-use facilities (data centers, hotels, museums). The company delivers services Austria-wide with a primary focus on Vienna and surrounding regions, including Lower Austria, Salzburg, Burgenland, Styria, and Carinthia. The firm is privately held by Managing Director Christopher Steidl and shareholder Herbert Raab, with no external investment, no M&A activity, and no disclosed funding rounds. Notable project references include the Regierungsgebäude Stubenring, Hotel Intercontinental Wien, 25hours Hotel, Eisbärenanlage Tiergarten Schönbrunn, and multiple klima:aktiv haus residential developments.

Name

InPlan Ingenieure GmbH

Legal name

InPlan Ingenieure GmbH

Website

https://inplan.at

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

1–10 employees

Short description

InPlan Ingenieure GmbH is a Vienna-based Austrian engineering consultancy specializing in integrated building physics and building services planning for residential, commercial, government, and special-use facilities across Austria, with expertise in BIM, energy efficiency, and renewable heating systems.

Ownership category

akta.pro rank

Product category

Engineering Consulting Services — Building Physics & Building Services

NAICS

Engineering Services (541330)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

HVAC Controls & Optimization (Smart Thermostats, VAV, Chillers/Boilers Controls) (BPABAGAB)

Keywords

• Building physics engineering
• HVAC system planning
• Energy performance consulting
• Electrical installation design
• Thermal energy renovation

Headquarters

HQ city

Vienna

HQ country

Austria

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Planning Services: B2B professional engineering services for building physics, building services (HVAC), and energy planning. Services include design planning, approval documentation, construction monitoring, and commissioning. Revenue is project-based with payment terms of 30 days from invoice. Contracts follow general terms for engineering bureaus (Fachverband Ingenieurbüros).

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

InPlan Ingenieure GmbH is an Austrian engineering consultancy (Ingenieurbüro) that delivers integrated planning and on-site monitoring across three core disciplines: building physics (Bauphysik covering thermal protection, summer suitability, moisture protection, sound protection, air pollutants, and deep probe simulation), building services (Gebäudetechnik HKLS covering heating, cooling, ventilation, sanitary, and Elektrotechnik covering electrical installations, alarm systems, KNX/EIB, photovoltaics), and energy planning (Energieplanung covering energy concepts, THEWOSAN renovation concepts, energy certificates, and energy accounting). The firm uses BIM-based 3D-CAD workflows to coordinate architectural and building services planning, and serves clients primarily in Vienna and other Austrian regions.

Product overview

InPlan Ingenieure GmbH is an Austrian engineering consulting firm (Ingenieurbüro) that provides integrated planning and monitoring services across two core disciplines: Building Physics (Bauphysik) and Building Technology (Gebäudetechnik). The company offers a unified portfolio of services organized around the integral planning approach—combining building physics with HVAC/building services engineering to create holistic, energy-efficient building solutions. The core services are divided into four main areas: Bauphysik (covering thermal protection, summer suitability, moisture protection, sound protection, air pollutants, and deep probe simulation); Gebäudetechnik HKLS (covering heating, cooling, ventilation, and sanitary systems, including heat pumps, district heating, solar thermal, biogenic fuels, climate technology, and ventilation); Elektrotechnik (covering electrical installations, alarm systems, security lighting, SAT systems, intercoms, photovoltaics, KNX/EIB bus systems, and elevators); and Energieplanung (covering energy concepts, THEWOSAN renovation, energy certificates, and energy accounting). The company employs BIM methodology using 3D CAD-BIM software to create integrated building models that optimize coordination between architectural planning and building services engineering.

Differentiator

Problem solved

Functional benefit

Products and services

• Bauphysik (Building Physics) Engineering services for analyzing and optimizing building behavior regarding heat, moisture, and sound. Scope covers Wärmeschutz (thermal protection), Sommertauglichkeit (summer suitability), Feuchteschutz (moisture protection), Schallschutz (sound protection), Luftschadstoffe (air pollutants), and Tiefensonden-Simulation (deep probe simulation). Serves Austrian building owners, developers, and government entities seeking Wiener Bauordnung §118 compliance, thermal-bridge mitigation, and acoustic optimization.
• Gebäudetechnik HKLS (Heizung-Klima-Lüftung-Sanitär) Building services engineering covering planning and on-site monitoring of heating, cooling, ventilation, and sanitary systems using BIM methodology. Includes heat pump systems (air, ground, groundwater), district heating connections, solar thermal, biogenic fuels (pellets, wood chips), controlled mechanical ventilation with heat recovery, and climate technology for residential, office, data center, museum, and manufacturing facilities.
• Elektrotechnik (Electrical Engineering) Planning of electrical installations including general installation technology, alarm systems, security lighting, emergency lighting, SAT systems, intercoms, photovoltaic systems, KNX/EIB bus systems, and elevator systems, plus existing-inventory analysis and IT-area power supply concepts. Delivered for residential, commercial, government, and IT-facility clients across Austria.
• Energieplanung (Energy Planning)

Quantifiable outcome

• Heat recovery rates of up to 90% achievable with controlled mechanical ventilation systems
• +2 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Two partnerships are on record, tiered core and minor.

• Huber Energietechnik AG (Zürich)coreTechnology or IntegrationPartnership for EWS simulation software used for thermal behavior simulation of deep bore heat exchanger systems. Huber Energietechnik AG provides specialized software for dimensioning and optimizing ground source heat pump systems.
• Geological Offices (Partner Offices)minorImplementation/ SI/ Consulting PartnerCollaboration with geological offices for preparation of geological expert opinions when required for deep bore heat exchanger projects, as well as for thermal response testing.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Emerging players

• Baumschlager Eberle Architekten: Austrian architecture firm with strong energy-efficient design focus, including building physics integration and net-zero building concepts. Comparable overlap on energy planning and building physics integration, though their primary identity is architectural rather than MEP engineering.

Direct peers

• ATP architekten ingenieure: Austrian integrated design firm combining architecture with building services and MEP engineering, employing BIM-based workflows. Comparable as an Austria-headquartered firm offering integral planning for energy-efficient buildings at a larger scale than InPlan.
• Ingenieurbüro Hausladen: German building physics and energy consultancy focused on integral energy concepts, building envelope optimization, and HVAC planning. Closely comparable to InPlan on building physics + energy planning integration for energy-efficient buildings.
• e7 energy innovation & engineering: Austrian energy engineering consultancy focused on energy efficiency, renewable integration, and building systems planning. Closely comparable on energy planning, geothermal, and decarbonization advisory work within the Austrian market.
• IC Consulenten ZT GmbH: Austrian engineering consultancy providing integrated MEP/HVAC and building services planning across building physics, energy, and electrical disciplines. Most comparable as a domestic Austrian peer with similar integral-planning value proposition and government/enterprise client base.
• Müller-BBM Group: German engineering consultancy with strong building physics, acoustics, and energy efficiency practices. Comparable on building physics consulting, acoustic measurement, and energy certificate services that InPlan also delivers.
• Werner Sobek Group: German engineering group covering structural engineering, façade design, building physics, and MEP planning. Comparable on the integral approach combining building physics with building services for energy-efficient and high-performance buildings.
• ee concept GmbH: German engineering consultancy specializing in energy-efficient building concepts, building physics, and HVAC planning. Direct comparable as a small specialist firm with similar integral energy + HVAC planning focus for residential and commercial buildings.

Broad incumbents

• Drees & Sommer SE: Large German engineering consultancy with MEP, energy, and sustainability practices spanning the full building lifecycle. Comparable on energy and building services planning but operates at significantly larger scale and broader scope than InPlan.

Regional players

• ZIEGEL Ingenieurbüro für Haustechnik: German MEP engineering consultancy providing HVAC, sanitary, and electrical planning for residential and commercial buildings. Comparable as a small specialist firm in integral building services engineering, but operating primarily in the German market rather than Austria.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/inplan-ingenieure-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 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 InPlan Ingenieure GmbH