Keller AG, Winterthur

What Keller AG, Winterthur does

Keller AG, Winterthur is a privately held Swiss Aktiengesellschaft (AG) founded in late 1982 by Max Keller, who remains the sole owner and managing director (Geschäftsführer und Inhaber). The company is headquartered at Riedhofstrasse 53, 8408 Winterthur (Wülflingen district), with a secondary magazine and workshop facility in Stadel, and operates exclusively in the Winterthur and surrounding region of Switzerland. It employs 18 people, including trained foremen, machine operators, garden construction specialists, garden maintenance workers, a department head for garden construction, warehouse/mechanic support, and 1-2 garden landscaping apprentices.

Keller AG operates as an integrated single-source construction and landscaping contractor across five service lines: demolition (Abbruch/Rückbau), excavation (Aushub), civil engineering (Tiefbau), garden construction (Gartenbau), and garden maintenance (Gartenunterhalt). The company self-executes each phase, allowing it to accompany clients from initial demolition through excavation, civil works, backfilling of new buildings, and final surrounding landscaping — eliminating coordination friction across multiple specialized contractors. Its owned Maschinenpark includes tracked excavators (CAT 318 BL 20.0t, PC 240 NLC-7 25t), wheeled (MH City 13t) and mini excavators (1.6t-5.5t), loaders, and all-wheel-drive dumpers, with attachments for sorting grapples, hydraulic breakers, concrete crushers, and pallet forks.

The business is project-based and quote-driven, serving residential property owners, general contractors (e.g., BW Generalbau AG), architects, developers, and municipal/governmental clients including Stadt Winterthur, Gemeinde Wiesendangen, Städtische Werke Winterthur, Baudirektion Kt. ZH, and Klinik Lindberg. Revenue derives from one-time construction and excavation projects, one-time garden construction and landscaping projects, and recurring garden maintenance contracts. Go-to-market is direct field service with consultation-first engagement, supported by a professional website, word-of-mouth, and architect/builder referrals; no resellers or marketplace channels are used. The company self-describes as the only Winterthur operator offering all five services under one roof, and positions long-tenured specialists (multiple employees with 20-40 year tenures) as a core differentiator.

Name

Keller AG, Winterthur

Legal name

Keller AG

Website

https://kellerag-winterthur.ch

Company type

Private

Founded year

1982

Operating status

Operating

Headcount range

1–10 employees

Short description

Keller AG, Winterthur is a Swiss construction and landscaping firm founded in 1982, offering integrated demolition, excavation, civil engineering, garden construction, and garden maintenance services to municipalities, architects, developers, and property owners in the Winterthur region, with an 18-person team and owned machinery fleet.

Ownership category

akta.pro rank

Headquarters

HQ city

Winterthur

HQ country

Switzerland

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Infrastructure, Operations, Supply Chain

Revenue model

1. Construction and Excavation Services: One-time project-based revenue from demolition, excavation, and civil engineering works. Services are provided to architects, property owners, municipalities, and general builders based on quotes and project specifications.
2. Garden Construction and Landscaping Services: Garden new installations and landscaping projects including pathway construction, planting, water features, pergolas, and garden redesign. Project-based professional services revenue.
3. Garden Maintenance Services: Recurring garden maintenance services including lawn mowing, flower bed care, pruning of bushes, shrubs and trees, and ongoing garden care services performed at agreed rhythms for property owners.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Keller AG, Winterthur is an integrated construction and landscaping contractor that delivers demolition (Abbruch), excavation (Aushub), civil engineering (Tiefbau), garden construction (Gartenbau), and garden maintenance (Gartenunterhalt) services under a single roof to property owners, architects, general builders, and municipalities in the Winterthur region. The company supports these services with an in-house machinery fleet and a workforce of qualified specialists who coordinate projects end-to-end, from demolition through to surrounding landscaping and ongoing garden care.

Product overview

Keller AG, Winterthur is a single unified construction company offering an integrated suite of services: demolition (Abbruch), excavation (Aushub), civil engineering (Tiefbau), garden construction (Gartenbau), and garden maintenance (Gartenunterhalt). The company operates as a full-service provider, accompanying customers from demolition and excavation through to backfilling of new buildings and completing surroundings work including paths, plazas, and planting. The company maintains its own machine fleet (Maschinenpark) and employs 18 staff including specialized workers and garden landscaping experts.

Differentiator

Problem solved

Functional benefit

Products and services

• Abbruch (Demolition) Building demolition and interior demolition services for property owners, developers, and general builders, including separation and disposal of materials according to regulations with recycling where possible (Rückbau/deconstruction).
• Aushub (Excavation) Construction excavation services including building pits, earthworks, digging of foundations, and terrain preparation requiring experience, precision, and spatial imagination in difficult terrain.
• Tiefbau (Civil Engineering) Civil engineering services for municipalities, utility companies, and property developers including trench construction, pipeline installation, road construction, canalization, surface work, and paving.
• Gartenbau (Garden Construction) Garden construction and landscaping services for residential property owners, MFH landlords, and commercial clients including garden redesign, new installations, pathways, patios, water features, swimming ponds, pergolas, and granite walls with fireplaces.
• Gartenunterhalt (Garden Maintenance) Recurring garden maintenance services for residential property owners, MFH landlords, and property management clients including lawn cutting, flower bed care, pruning of bushes, shrubs and trees, and grass mowing performed at agreed rhythms for larger residential and commercial properties.

Quantifiable outcome

• Complete construction-to-landscaping projects with single-source responsibility and internal coordination

Named customers6 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators5 records

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• Marti Group: Privately held Swiss construction group operating in building construction, civil engineering, tunneling, and foundation works. Comparable in core civil-engineering and site-prep activity to Keller AG, with a multi-regional Swiss presence.
• Walo Bertschinger AG: Swiss general contractor with strong civil engineering and road construction capabilities. Overlaps with Keller AG's Tiefbau (civil engineering) and road/surface construction offerings, though operating at substantially larger scale.
• Implenia AG: Switzerland's largest construction and real estate services group, active across building construction, civil engineering, and infrastructure — comparable end-markets (civil engineering, excavation-adjacent works) to Keller AG, but at vastly greater scale and with national reach rather than a single Winterthur footprint.
• KIBAG: Swiss construction services group covering civil engineering, road construction, excavation, and material recovery. Directly comparable service mix to Keller AG's excavation and civil engineering offerings, with multi-region Swiss operations.
• Eberhard Bau AG: Swiss construction and civil engineering firm based in the greater Zurich region, active in demolition, excavation, and infrastructure works. Geographic and service-line overlap with Keller AG's Winterthur-area demolition and civil engineering business.
• STRABAG AG: European construction multinational active across civil engineering, building construction, and infrastructure. Comparable in service mix (excavation, civil engineering) to Keller AG, but at a vastly larger international scale and with different geographic exposure.

Regional players

• Hagedorn AG: German demolition and civil engineering specialist with strong focus on Rückbau (deconstruction), material recycling, and earthworks. Closest comparability to Keller AG's demolition and excavation service lines, though operating primarily in Germany rather than Switzerland.

Others

• Jardins de Suisse / JardinSuisse members: Swiss professional association for garden and landscape contractors. While not a single competitor, its member firms (regional Swiss garden/landscape construction companies) collectively compete with Keller AG's Gartenbau and Gartenunterhalt service lines in the Winterthur/Zurich market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/keller-ag-winterthur

Revenue estimate

Valuation estimate

Number of profiles

Profiles16 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 Keller AG, Winterthur