Efficiency

What Efficiency does

Wirkungsgrad - Ingenieurbüro für Bauphysik und Energieeffizienz (operating under the brand 'Efficiency') is a private engineering consultancy based in Dinslaken, North Rhine-Westphalia, Germany, structured as a sole proprietorship founded by Dipl.-Ing. (FH) Dirk Schwamborn on January 1, 2015. The firm specializes in building physics and energy efficiency consulting, offering services including Energieberatung (energy consulting with thermography, Blower Door air tightness testing, and DIN 1946-6 ventilation concepts), Energieausweise (energy performance certificates for residential and non-residential buildings), Schall- und Wärmeschutz expert opinions under GEG 2024, Energieeffizienz-Experte services for KfW subsidy programs, and Bauherren-Beratung (client/owner advisory). The practice holds a stack of government-recognized credentials — BAFA Vor-Ort-Energieberater (since 2006), KfW Sachverständiger (since June 2014), dena Energieeffizienz-Experte (since 2007), Verbraucherzentrale NRW/Bundesverband advisor, and state-certified Sachverständiger for Schall- und Wärmeschutz from Ingenieurkammer-Bau NRW (since January 2014) — which collectively function as the firm's primary competitive moat.

The firm serves four primary customer segments: residential property owners and homebuyers (the primary segment, using services for renovation roadmaps, energy certificates, and KfW/BAFA subsidy applications); commercial and industrial building operators (requiring energy certificates and GEG compliance for rental or sale); heritage and monument property owners (specialized energy renovation concepts for listed buildings); and new construction developers (Effizienzhaus certification and GEG compliance verification). Named commercial clients include three regional SMBs — Stewes GmbH & Co. KG, Klauser Schuhe, and Salamander Schuhgeschäft GmbH — referenced under the company's corporate client section.

The business model is a traditional B2C and B2B professional services practice: fees are generated per engagement on a quote-based pricing model, with an initial phone consultation offered free of charge as a lead-nurturing mechanism. Customer acquisition relies on direct referrals, municipality networks across the Dinslaken/Voerde/Hünxe/Wesel/Oberhausen/Duisburg service area, the official dena Energieeffizienz-Expertenliste online directory, and a company website (wirkungsgrad.org). The firm operates with a single practitioner (Dirk Schwamborn), delivers services personally through on-site visits, and has no disclosed employees, resellers, or intermediaries.

Name

Efficiency

Legal name

Wirkungsgrad - Ingenieurbüro für Bauphysik und Energieeffizienz

Website

https://wirkungsgrad.org

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

Wirkungsgrad is a sole-proprietor engineering consultancy in Dinslaken, Germany, offering building physics and energy efficiency services (energy certificates, KfW/BAFA subsidy consulting, Schall- und Wärmeschutz expert opinions) to residential property owners, commercial operators, heritage building owners, and new construction developers across North Rhine-Westphalia.

Ownership category

akta.pro rank

Product category

Building Physics and Energy Efficiency Consulting

NAICS

Engineering Services (54133)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Systems Engineering & Technical Program Management (BPAHAIAI)

Keywords

• Energy consulting
• Building physics engineering
• Energy performance certificates
• KfW subsidy advisory
• Thermal insulation consulting

Headquarters

HQ city

Dinslaken

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Professional Consulting Services: Fees for engineering and consulting services including energy consulting, building physics expert opinions, and building owner advisory. Revenue generated from direct client engagements for residential and commercial building projects, new construction, renovation, and heritage properties.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels5 records

Core offering

Wirkungsgrad is a Dinslaken-based engineering office that delivers energy consulting, building physics expert opinions, and energy performance certificate services to residential property owners, commercial building operators, heritage monument owners, and new construction developers. Its portfolio includes Energieberatung, Energieausweise, state-certified Sachverständiger services for sound and thermal protection, Energieeffizienz-Experte (KfW program) certification, and Bauherren-Beratung. The firm supports clients in accessing federal subsidies such as BAFA and KfW funding programs (151, 152, 153, 430, 431).

Product overview

Wirkungsgrad is an engineering office (Ingenieurbüro) for building physics and energy efficiency based in Dinslaken, Germany. The company offers a portfolio of consulting services centered around energy efficiency in buildings, led by state-certified expert Dirk Schwamborn. The core offerings include Energieberatung (energy consulting with services like thermography, air tightness, and ventilation concepts), state-certified expert services for Schall- und Wärmeschutz (sound and thermal protection), Energieeffizienz-Experte (KfW program certification and expert services), Energieausweise (energy performance certificates), and Bauherren-Beratung (client/property owner consulting). The company serves residential and commercial clients across the Dinslaken, Voerde, Hünxe, Wesel, Oberhausen, and Duisburg region.

Differentiator

Problem solved

Functional benefit

Products and services

• Energieberatung (Energy Consulting) Comprehensive energy consulting for residential and commercial buildings, including individual renovation roadmaps (iSFP), building thermography, air tightness concepts, ventilation concepts per DIN 1946-6, and energy audits per EDL-G, delivered to property owners, buyers, landlords, and building operators.
• Staatlich anerkannter Sachverständiger für Schall- und Wärmeschutz State-certified expert services for sound and thermal protection, including specialist planning for thermal insulation and building acoustics, public-law certifications for sound protection in construction, and energy-saving thermal protection assessments per GEG 2024, delivered to building clients and developers in North Rhine-Westphalia.
• Energieeffizienz-Experte Energy efficiency expert service listed in the federal expert register, providing consulting for SME energy efficiency, independent on-site advisory services, and expert certification for KfW Bank energy-efficient construction and renovation programs (151, 152, 153, 430, 431) including technical planning and construction supervision, delivered to SME clients, developers, and property owners seeking federal subsidy access.
• Energieausweise (Energy Certificates) Issuance of energy certificates for residential and non-residential buildings, including Bedarfsausweis (requirement certificates), Verbrauchsausweis (consumption certificates), and dena-quality-seal certificates, for property owners, buyers, landlords, and commercial building operators needing legally compliant energy documentation.
• Bauherren-Beratung (Client Consulting) Individual consulting services for clients, property owners, tenants, and landlords, including purchase consultation during property inspections, advice on building conversion or renovation, and damage assessment consultation, delivered to private individuals undertaking property transactions.

Quantifiable outcome

• Independent Vor-Ort-Energieberater qualification enables clients to receive BAFA subsidies covering a portion of energy consulting costs.
• +1 more outcomes

Named customers3 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

Feature6 records

Partnerships

Four partnerships are on record, tiered core and minor.

• Verbraucherzentrale NRW / Verbraucherzentrale BundesverbandcoreOthers · 1 January 2015Acted as an energy consultant for the Verbraucherzentrale NRW under the Energie 2020 project, providing independent energy advice to consumers. Following the project's conclusion, advisory activities continue under the Verbraucherzentrale Bundesverband. This partnership positions the firm as a trusted consumer-facing energy advisor in NRW.
• Deutsche Energie-Agentur (dena) - German Energy AgencycoreOthers · 1 January 2007Listed in the Energieeffizienz-Expertenliste (Energy Efficiency Experts List) maintained by the German Energy Agency (dena). This is the official national registry of qualified energy consultants for federal subsidy programs. Dirk Schwamborn has been listed as an Aussteller von Energieausweisen (energy certificate issuer) and Effizienzhaus-Experte since 2007, with renewal every two years contingent on continued training and practice reports.
• Ingenieurkammer-Bau Nordrhein-Westfalen (NRW Chamber of Engineers)coreOthers · 1 January 2007Member of the Ingenieurkammer-Bau NRW (member no. 718894) since 2007. Listed in both the Engineers Register and the expert list of independent energy consultants maintained by the chamber. The chamber granted state-certified Sachverständiger recognition for Schall- und Wärmeschutz in January 2014.
• Allianz Versicherungs-AGminorOthersProfessional liability insurance (Berufshaftpflichtversicherung) provider as required for licensed engineering consultants in Germany. Contact: Herr Michael Kerkes, Generalvertretung, Otto-Lilienthal-Straße 17a, with coverage limited to Germany.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Others

• Verbraucherzentrale NRW: North Rhine-Westphalia consumer advice center that directly commissions the firm's Energieberater work under the Energie 2020 project and Verbraucherzentrale Bundesverband follow-on, making it both a referral partner and an organization with overlapping residential energy advisory services.
• Deutsche Energie-Agentur (dena): The German Energy Agency operates the Energieeffizienz-Expertenliste where the firm is registered; it sets national credentialing standards, runs federal energy efficiency programs, and is the primary referrer of subsidy-qualified experts to property owners.
• co2online GmbH: Berlin-based non-profit energy information provider linked directly from the firm's website; offers complementary consumer-facing energy-saving content and tool-based advice that funnels users toward certified expert consultants like the subject firm.
• EnergieAgentur.NRW: The North Rhine-Westphalia state energy agency providing free or subsidized advisory services for residential and SME customers in the same NRW service region as the firm, with overlapping mandate around subsidy uptake.
• Verbraucherzentrale Bundesverband: Federal umbrella of the German consumer advice centers; succeeded the NRW Energie 2020 partnership with continued commission of the firm's consumer-facing energy consultations, providing a steady referral channel for residential energy-advice engagements.
• Ingenieurkammer-Bau Nordrhein-Westfalen: The NRW engineering chamber that credentialed the firm's founder as saSV (state-certified Sachverständiger) and maintains the Engineers Register and energy-consultant expert lists; functions as a credentialing and referral ecosystem partner.

Broad incumbents

• Stiebel Eltron: Large heat-pump and hot-water manufacturer running parallel residential energy advice content and renovation subsidy guidance; overlaps with the firm's KfW-subsidy-supported renovation advisory use case at greater scale.
• Viessmann Energieberatung: Large established HVAC manufacturer that operates consumer-facing energy consulting for heating, renovation, and subsidy navigation; it competes in the same residential energy-advice funnel but as part of a broader heating-equipment portfolio.
• E.ON Energieberatung: Major German energy utility offering residential energy audits, efficiency advice, and subsidy navigation through its Energieberatung service; competes for the same German homeowner advisory budget with much larger geographic reach.
• Vaillant Energieberatung: Major heating-systems manufacturer offering property owners energy consulting tied to heat-pump and renovation upgrades; provides similar service overlap with subsidy-driven residential customers across Germany.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/ib.wirkungsgrad

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Efficiency