ITH Sonnberger GmbH

What ITH Sonnberger GmbH does

Ith Sonnberger GmbH is a privately held, family-managed Austrian real estate firm headquartered in Dörfling/Kronstorf, Upper Austria. Founded in 2013 and operating under the consumer brand Sonnberger.Immobilien, the company runs a hybrid real-estate model that combines residential brokerage (sale, purchase, and rental of houses, apartments, penthouses, and land) with a principal developer business (Bauträger) under which it conceives, builds, and sells its own projects, including Panoramavilla in Kematen, Wohnen hoch 2 in Steyr, the SONNENHEIM complex in Eberstalzell, the Vollwerthaus line, and the GRUND.IDEE Strengberg land development. Its core services include professional property valuation (with a free online tool), multi-channel property marketing and a Verkaufsgarantie (sales guarantee), buyer-side tools such as the Wohntraumfinder personalized search and VIP email alerts, and an owner-facing Immobilientracking portal for monitoring listing activity. Around the brokerage core it has built complementary advisory lines, notably Anlagewohnungen (investment-apartment) brokerage and Leibrente (life annuity / reverse-mortgage) assessment.

The technology surface is deliberately conventional for a regional brokerage. The firm runs a WordPress-based own-website listing portal syndicated to major Austrian property marketplaces (willhaben.at, immosuchmaschine.at), backed by Google Analytics 4, Google Tag Manager, WhatsApp for client communication, and share-to-social buttons on every listing. There is no proprietary platform, no API, no app, and no AI/ML feature layer. Marketing is content-led (Ratgeber guidebooks, an Immoblog, a Wohnmarktbericht, and the MEHR.matchplay golf sponsorship with 2027 early-bird tickets referenced) to drive inbound seller and buyer leads into free online valuation and consultation funnels.

The revenue mechanics are transaction-based. Brokerage commissions on resold properties are 3% plus 20% VAT on the buyer side (3.6% all-in), while several in-house developer projects are sold provisionsfrei (no buyer commission) so margin is captured at the developer level. Customers are mid-market individual residential sellers and buyers, plus a secondary segment of buy-to-rent investors and senior-property clients served via the Leibrente line; the firm has 4 named professionals (Roman Sonnberger as managing director / licensed Immobilientreuhänder, Christine Sonnberger in advisory, Bernadette Wagner front-office, Andrea Binder back-office) listed on its team page, with total reported headcount of 8. Operations are concentrated in Upper Austria, with some Lower Austria exposure, and there is no evidence of external institutional ownership or funding.

Name

ITH Sonnberger GmbH

Legal name

ITH Sonnberger GmbH

Website

https://sonnberger.co.at

Company type

Private

Operating status

Operating

Headcount range

1–10 employees

Short description

Ith Sonnberger GmbH is a family-run Austrian real estate firm in Kronstorf, Upper Austria, combining residential brokerage with in-house property development (Panoramavilla, Wohnen hoch 2, SONNENHEIM), serving mid-market individual buyers, sellers, and buy-to-rent investors in regional Upper Austria.

Ownership category

akta.pro rank

Product category

Residential Real Estate Brokerage

NAICS

Offices of Real Estate Agents and Brokers (53121)

SIC

Real Estate Agents & Managers (For Others) (6531), Real Estate Dealers (For Their Own Account) (6532)

akta.pro primary industry

Residential Investment Property Brokerage (SFR/Small Multifamily) (BPAJAAAE)

Keywords

• Residential real estate brokerage
• Property valuation services
• Real estate development
• Land development projects
• Property marketing services

Headquarters

HQ city

Kronstorf

HQ country

Austria

HQ region

Europe

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

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

Revenue model

1. Bauträger (Developer/Principal Sales): The company develops its own residential projects and sells units directly (Neubau-Eigentumswohnungen in Steyr, Kematen, Eberstalzell). This represents a principal/developer revenue stream alongside brokerage, with the company acting as developer (Bauträger) and Baulandentwicklung (land development) operator.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

ITH Sonnberger GmbH is a family-owned Austrian real estate brokerage that mediates residential property sales, purchases, and rentals across Upper Austria, complemented by an in-house property development arm (Bauträger) that builds and sells its own new-construction apartments and develops land parcels. Core services include free online property valuation, professional marketing with a sales guarantee (Verkaufsgarantie), buyer-side requirement matching via the Wohntraumfinder, and end-to-end transaction support including financing and energy certificate handling.

Product overview

ITH Sonnberger GmbH is a traditional Austrian real estate brokerage firm offering professional property brokerage, development, and marketing services. The portfolio consists of a unified service offering centered on residential real estate transactions, supplemented by proprietary new construction projects (Sonnberger Vollwerthaus, SONNENHEIM Eberstalzell) and land development (GRUND.IDEE Strengberg). Development projects include Panoramavilla (Kematen) with 3 apartments and Wohnen hoch 2 (Steyr) with 13 apartments. The core service encompasses property valuation, marketing, brokerage, and owner services including an online tracking portal. Complementary services include free guidebooks, VIP email alerts, and a life annuity assessment tool. The company operates primarily in Upper Austria with properties across multiple Austrian regions.

Differentiator

Problem solved

Functional benefit

Products and services

• Immobilienvermittlung (Real Estate Brokerage) Professional real estate brokerage service for residential property sales, purchases, and rentals across Upper Austria, including a structured sales process with a Verkaufsgarantie (sales guarantee) concept, aimed at individual property owners and buyers.
• Immobilienbewertung (Online Property Valuation) Free online property valuation tool allowing owners to obtain an initial market value assessment, which is then reviewed personally by the Sonnberger team, used to generate qualified seller leads for the brokerage.
• Immobilienmarketing Comprehensive real estate marketing service including professional photography, virtual tours, and multi-channel property listing syndication for sellers engaging the brokerage.
• Sonnberger Vollwerthaus Proprietary full-value house brand offering newly constructed residential properties under the Sonnberger name with modern architecture and energy-efficient design, sold directly by the firm as Bauträger.
• Panoramavilla New construction ownership apartment project in Kematen an der Krems featuring 3 apartments, including a penthouse with a 48 m² terrace and panoramic views near the Kremstal golf course.
• Wohnen hoch 2 New construction ownership apartment project in Steyr comprising 13 apartments ranging from 2 to 4 rooms, with terraces and carport options.
• Wohnpark Sonnenstraße Modern residential complex offering both ownership and rental apartments, providing flexible housing options for buyers and tenants in Upper Austria.
• SONNENHEIM Eberstalzell

Named customers3 records

Segments3 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• JP Immobilien GmbH: Austrian residential and commercial brokerage active across federal states including Upper Austria. Comparable on residential brokerage GTM, online valuation tools, and developer project sales.
• Ottos Immobilien: Austrian residential and commercial brokerage with regional offices. Comparable on residential brokerage services, valuation tools, and developer-adjacent services for the Austrian mid-market.
• Spieler Immobilien GmbH: Upper Austrian regional brokerage with residential focus. Direct regional competitor in the same Upper Austrian footprint, offering similar broker and valuation services to mid-market buyers and sellers.
• IMMO-CONTRACT Maklergesellschaft m.b.H. Austrian full-service brokerage covering residential, commercial, and investment properties with offices across federal states. Comparable on residential brokerage offerings, developer project sales, and investment-property focus (Anlagewohnungen).
• Real-Treuhand Immobilien Vertriebs GmbH: Austrian full-service real estate firm combining brokerage, property management, and appraisal. Comparable on residential brokerage and developer-project marketing for the Austrian market.

Broad incumbents

• EHL Immobilien GmbH: Austria's largest real estate services group offering brokerage, valuation, asset management, and investment across all major asset classes. Comparable to ITH Sonnberger as a brokerage competitor operating nationally with far greater scale and brand recognition.
• RE/MAX Austria: Global franchise brokerage with dense Austrian agent network including regional offices. Comparable on residential brokerage GTM motion, with franchise-driven marketing scale and standardized technology stack.
• Engel & Völkers Österreich: International luxury-focused brokerage franchise with a strong Austrian presence. Comparable on residential brokerage services and buyer/seller representation, with broader geographic reach and a premium-brand positioning.
• BUWOG Group GmbH: One of Austria's leading residential property developers, building and selling condominium apartments nationally. Comparable on the developer/Bauträger side of ITH Sonnberger's business, with vastly larger project pipeline and capital base.

Others

• IMMOunited GmbH: Austrian real estate data and analytics platform providing market data, valuation indices, and broker software. Comparable as an ecosystem enabler for Austrian residential brokerage rather than a direct competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/sonnbergerimmobilien

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 ITH Sonnberger GmbH