Madsen & Kastberg A/S

What Madsen & Kastberg A/S does

Madsen & Kastberg A/S is a privately held Danish multi-trade construction and service group headquartered in Brøndby, with a regional office in Ringe on Funen. Founded in December 2019 by Rasmus Boiden Madsen and Brian Kastberg, the group has scaled from three employees to approximately 190-200 in roughly five years, delivering integrated plumbing/heating (VVS), DBI-certified sprinkler, carpentry, masonry, and painting services across Sjælland and the Fyn/Triangle area.

The group operates through three wholly-owned subsidiaries under the holding company Madsen & Kastberg Gruppen A/S: Madsen & Kastberg VVS A/S (plumbing and heating on Zealand), Madsen & Kastberg Sprinkler og VVS Teknik A/S (sprinkler and VVS across Denmark, one of approximately 15 DBI-authorized sprinkler firms in the country), and Madsen & Kastberg Byg A/S (carpentry, masonry, painting, and general contracting). Its technology stack is centered on integrated multi-trade delivery rather than software platforms; certifications include DBI sprinkler approval, ISO quality management (via Validan), KMO refrigeration environmental certification, and Byg Garanti membership.

Madsen & Kastberg generates revenue through two primary channels: a service department that books individual craftspeople for smaller jobs and 24/7 emergency VVS work, and an enterprise/construction department that handles specialized trade contracts and main contractor projects. Insurance damage work is delivered through framework agreements with If Forsikring and Topdanmark, and a partnership with PKA Ejendomme covers approximately 2,000 Swan-labeled properties. The company maintains roughly 25 apprentices under continuous training and serves enterprise clients including Copenhagen Marriott, Bella Center, the Royal Danish Theatre, and the Danish Defence Intelligence Service. Recent strategic activity has focused on geographic consolidation in Fyn via acquisitions (December 2023 and January 2026), headquarters expansion in Brøndby (November 2024), and senior operational leadership reinforcement with a new COO joining in April 2026.

Name

Madsen & Kastberg A/S

Legal name

Madsen & Kastberg A/S

Website

https://m-k.dk

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

101–250 employees

Short description

Madsen & Kastberg is a Danish privately held multi-trade construction group delivering integrated VVS, DBI-certified sprinkler, carpentry, masonry, and painting services across Sjælland and Fyn. It serves enterprise clients, housing associations, insurance partners, and private customers through service and enterprise channels.

Ownership category

akta.pro rank

Product category

Multi-Trade Construction Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

Services-Facilities Support Management Services (8744)

akta.pro primary industry

Hard Services (MEP/HVAC, Electrical, Plumbing) (BPABAAAA)

Keywords

• Multi-trade construction services
• Plumbing heating services
• Sprinkler installation maintenance
• Building renovation services
• Carpentry masonry painting

Headquarters

HQ city

Brøndbyvester

HQ country

Denmark

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel

Revenue model

1. Service & Maintenance Contracts: Ongoing service and maintenance work for VVS, sprinkler, carpentry, masonry, and painting across residential and commercial properties. Includes 24/7 emergency service and insurance work.
2. Construction Contracts (Fag- og Hovedentreprise): Specialized trade contracts and main contractor contracts for renovation and new construction projects. Ranges from smaller specialized work to large-scale main contractor projects.
3. Insurance Claim Work: Handling of insurance damage claims for water damage, fire damage, installation damage, and subsequent repairs. Works with major insurance companies including If and Topdanmark.
4. Hourly Craftsman Services: Time-based craftsman services for private consumers and businesses, bookable via website for VVS, carpentry, masonry, painting, and sprinkler work.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Madsen & Kastberg delivers integrated VVS (plumbing/heating), sprinkler, carpentry, masonry, and painting services to property administrators, housing associations, building owners, architects, insurance companies, and private consumers across Sjælland and Funen. Services are delivered through two channels: a Service Department that handles smaller jobs and maintenance via an online booking system, and an Enterprise Department that executes trade, technical, and main contractor (hoved-) contracts for renovation and new-build projects. The company also operates 24/7 emergency VVS response and handles insurance damage claims for partners such as If Forsikring and Topdanmark.

Product overview

Madsen & Kastberg A/S is a multi-trade construction company offering integrated VVS (plumbing/heating), sprinkler, carpenter, painter, and mason services. The company operates through three subsidiaries: Madsen & Kastberg VVS A/S (plumbing services in Zealand), Madsen & Kastberg Sprinkler og VVS Teknik A/S (sprinkler and VVS in Funen), and Madsen & Kastberg Byg A/S (carpentry, masonry, and painting). Services are delivered through two main channels: a Service Department for maintenance and small tasks, and an Enterprise/Construction Department for larger projects including main contracts. The company also offers specialized insurance damage handling services. All trades are performed in-house with coordinated project management.

Differentiator

Problem solved

Functional benefit

Products and services

• VVS Services Plumbing, heating, gas boiler installation, district heating, water installations, and 24/7 emergency VVS service for property administrators, housing associations, building owners, and private consumers across Sjælland.
• Sprinkler Services
• Carpenter Services
• Painter Services
• Mason Services
• Construction / Enterprise Services
• Insurance Damage Handling
• Craftsman Booking (Book en håndværker)

Quantifiable outcome

• Grown from 3 employees to nearly 200 in approximately 5 years
• +2 more outcomes

Named customers10 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

Feature3 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• TEKNIQ ArbejdsgivernecoreOthersTrade association membership providing employer support, industry representation, and professional development resources for the technical installation sector.
• Byg GaranticoreOthersConstruction guarantee scheme that provides warranty protection for customers. Madsen & Kastberg participates in this consumer protection program.
• Dansk Brand- og sikringsteknisk Institut (DBI)coreTechnology or IntegrationDBI provides sprinkler certification and standards for fire safety systems. Madsen & Kastberg holds DBI sprinkler approval - one of approximately 15 companies in Denmark with this certification.
• If ForsikringcoreStrategic or Co-development PartnerMajor insurance company with framework agreement for handling property damage claims. Madsen & Kastberg provides VVS and related repair services through dedicated teams.
• TopdanmarkcoreStrategic or Co-development PartnerMajor insurance company with framework agreement for handling property damage claims. Madsen & Kastberg provides VVS and related repair services through dedicated teams.
• Midtfyns FestivalcoreGTM or Marketing PartnerMain sponsor of Midtfyns Festival in Ringe. Company has strong local ties to Funen region where they operate their regional office. Festival connection stems from history - the iconic guitar at festival was created by Midtfyns VVS, now part of Madsen & Kastberg.
• Odense Boldklub (OB) - Club 1887minorGTM or Marketing PartnerClub 1887 sponsorship in Odense Boldklub football club. Local community engagement for company with operations on Funen.
• PKA EjendommeminorStrategic or Co-development PartnerPartnership for Swan-labeled building operations (svanemærket bygningsdrift) managing approximately 2,000 properties. Unique environmental certification partnership.

Scale indicators6 records

Recent moves8 records

Expansion highlights5 records

Direct peers

• Bravida Denmark: Leading Nordic multi-trade technical services (electrical, HVAC, plumbing) firm with a Danish operation; competes for the same enterprise, public-sector and property manager contracts.
• Kemp & Lauritzen: Established Danish technical installation and service company specializing in electrical, plumbing and HVAC; directly comparable to M&K's VVS and enterprise offering.
• Wicotec Kirkebjerg: Danish technical contractor delivering HVAC, plumbing, sprinkler and fire safety services with national coverage; one of the closer multi-trade service peers to M&K.
• Caverion Denmark: Nordic provider of building technical solutions including HVAC, plumbing and fire safety; competes with M&K on sprinkler and VVS enterprise projects.
• GK Danmark: Major Nordic HVAC, plumbing and multi-trade technical services provider; M&K's new COO (former CEO) joined from here, signaling GK is the closest direct competitor in Danish enterprise multi-trade services.

Broad incumbents

• Skanska Denmark: Global construction and development firm with strong Danish presence in commercial and residential building; competing incumbent for large enterprise renovation projects.
• Per Aarsleff Holding: Major Danish construction and infrastructure group with significant building technical services exposure; broad incumbent competing on large enterprise and public-sector projects.
• MT Højgaard: One of Denmark's largest construction and civil engineering groups offering main contracts and specialty trades; competes for the same hovedentreprise and renovation projects at larger scale.
• NCC Denmark: Nordic construction group with significant Danish operations in renovation, housing and commercial construction; competes for larger main contract opportunities.

Regional players

• Midtfyns VVS (historical): Funen-based VVS predecessor now integrated into M&K; representative of the regional single-trade plumbing firms that remain potential roll-up targets and peers in the Danish market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/madsen-kastberg

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries3 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 Madsen & Kastberg A/S