Byggmastargruppen

What Byggmastargruppen does

Byggmästargruppen Stockholm BMG AB is a Stockholm-based Swedish construction company specializing in ROT (renovation, conversion, extension) services, operating through two business areas: ROT Bostad and ROT Kommersiellt. ROT Bostad focuses on stambyte (pipe replacement) and comprehensive renovation of multi-family residential buildings, with a differentiated kvarboende methodology enabling renovation while residents remain in their apartments; the company claims market leadership in Swedish stambyte with a production capacity of approximately 2,000 apartments per year and 10,000+ apartments renovated in the Stockholm region over the past five years. ROT Kommersiellt handles commercial renovation including office adaptations, retail, healthcare facilities, schools, and industrial buildings. The company's technical stack includes a proprietary luftad konstruktion (room-in-room ventilated construction) technique that reduces bathroom renovation time to approximately 3 weeks, alongside a customer-facing digital service portal called Byggmästarportalen.

The company's revenue model is project-based professional services, with work secured through competitive tenders, framework agreements (ramavtal) typically valued at SEK 40-200M per project, and multi-year strategic partnering arrangements (samverkan) with durations of 6-10 years. Pricing is custom-quoted per project scope. Customer segments include Swedish public housing companies (Stockholmshem, Botkyrkabyggen, Uppsalahem, Huge Bostäder, Väsbyhem), housing cooperatives (HSB-affiliated BRFs), and private real estate companies (Rikshem, Riksbyggen, Savills, Vasakronan, Vectura Fastigheter), with revenue geographically concentrated in Stockholm County and Uppsala County. The company is a wholly owned subsidiary of SEHED Byggmästargruppen AB (a conglomerate headquartered in Tyresö) and operates within the broader SEHED-koncernen that includes sister specialist firms covering roofing, facades, sheet metal, and general building services. Revenue is not publicly disclosed, and the company holds AAA credit rating, BKMA certification, Byggföretagen membership, and Miljöbyggnad Silver certification on select projects.

Name

Byggmastargruppen

Legal name

Byggmästargruppen Stockholm BMG AB

Website

https://byggmastargruppen.se

Company type

Private

Operating status

Operating

Headcount range

51–100 employees

Short description

Byggmästargruppen is a Stockholm-based Swedish construction firm specializing in residential pipe replacement (stambyte) and commercial renovation, serving public housing companies, housing cooperatives, and private real estate clients across the Stockholm and Uppsala regions, with claimed market leadership in stay-in-place renovation methodology.

Ownership category

akta.pro rank

Product category

Building Renovation Services

NAICS

Residential Remodelers (236118)

SIC

General Bldg Contractors - Residential Bldgs (1520)

akta.pro primary industry

Renovation, Remodeling & Tenant Improvements (General Contracting) (IMAFAAAE)

akta.pro secondary industries

Full Gut Renovation (Studs-Out Remodel) (HSAPAEAA), Kitchen Permitting, Design & Project Management (HSAPAAAK)

Keywords

• Pipe replacement services
• Residential building renovation
• Commercial property renovation
• Stay-in-place renovation
• Construction project services

Headquarters

HQ city

Johanneshov

HQ country

Sweden

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. ROT Bostad services: Pipe replacement (stambyte) and renovation of multi-family residential buildings. Includes total renovation of apartments with bathroom and kitchen renovation, electrical updates, and energy efficiency improvements. Revenue generated through project-based contracts with housing companies and cooperatives.
2. ROT Kommersiellt services: Commercial renovation including tenant adaptations, office conversions, healthcare facilities, schools, and industrial buildings. Includes total renovation projects like Stadshagsskolan and new construction projects.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Byggmästargruppen provides specialized ROT (Renovation, Conversion, Extension) construction services through two business areas: ROT Bostad (residential renovation specializing in stambyte/pipe replacement with expertise in keeping residents in their homes during renovation) and ROT Kommersiellt (commercial renovation including tenant adaptations, office conversions, healthcare facilities, schools, and industrial buildings). The company secures projects through competitive tenders, framework agreements, and strategic partnering with major clients in the Stockholm region and eastern Sweden.

Product overview

Byggmästargruppen Stockholm BMG AB is a Stockholm-based construction company offering specialized ROT (renovation, conversion, extension) services through two distinct business areas: ROT Bostad and ROT Kommersiellt. ROT Bostad specializes in stambyte (stack replacement) and renovation of multi-family residential buildings, with the company claiming market leadership in stambyte with approximately 2,000 apartments renovated annually, predominantly with residents remaining in their homes. ROT Kommersiellt handles commercial property renovations including office adaptations, retail spaces, healthcare facilities, schools, and industrial buildings. The company also offers a digital service platform called Byggmästarportalen for customer interaction and a sustainability initiative called Byggomloppet focused on circular economy practices.

Differentiator

Problem solved

Functional benefit

Brands

• Byggomloppet: A sustainability initiative launched by Byggmästargruppen that defines and formalizes their circular economy work in construction, including material reuse, waste reduction, and sustainable building practices.

Quantifiable outcome

• ~2,000 apartments renovated per year
• +5 more outcomes

Named customers15 records

Segments4 records

Ideal customer profiles4 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

16 partnerships are on record, tiered core and minor.

• BotkyrkabyggencoreStrategic or Co-development Partner · 14 May 2025Strategic partnering agreement spanning 6-10 years. Initial assignment includes pipe replacement in 5 buildings with 162 apartments, with potential for additional ~1,300 apartments. Continuation of successful previous collaboration including Kv Byatomten (235 apartments) and Kv Lagmannen (178 apartments). Focus on sustainable renovation with residents staying in place.
• UppsalahemcoreStrategic or Co-development Partner · 6 December 2021Framework agreement for major maintenance and renovation work valued at up to 200 Mkr per project with total framework capacity up to 250 Mkr per year. Covers Uppsala urban area and surrounding areas. Agreement period of 2 years with possibility to extend for additional 2 years.
• Huge Bostäder ABcoreChannel Partner/ Reseller/ Distributor · 18 August 2021Framework agreement for ROT projects in Huddinge municipality. Manages approximately 8,000 homes plus commercial spaces and district centers. Initial 2-year agreement with potential to extend for another 2 years.
• RikshemcoreStrategic or Co-development Partner · 22 April 2021Framework agreement for ROT work. Rikshem is one of Sweden's largest private real estate companies with approximately 29,000 apartments and numerous public properties. Owned by Fjärde AP-fonden and AMF Pensionsförsäkring AB.
• VäsbyhemcoreStrategic or Co-development Partner · 1 January 2017Long-term collaboration on renovation projects including Hasselgatan project (121 apartments), Hagängsvägen (first completed area), and ongoing projects. Worked with AFRY as consultant partner. Large-scale project covering 650 apartments over 5 years.
• SEHED Tresson ABcoreStrategic or Co-development PartnerSister company within SEHED-koncernen providing specialist services in roofing, facades, balconies, and windows. Supports Byggmästargruppen's operations with specialized trade expertise. CEO Magnus Zetterlund serves as acting VD for both companies.
• Bång & Lewerth ABcoreStrategic or Co-development PartnerSpecialist company within SEHED-koncernen network. Part of the group of specialist contractors supporting Byggmästargruppen's comprehensive building services.
• Erikssons Plåt ABcoreStrategic or Co-development PartnerSpecialist sheet metal company within SEHED-koncernen. Provides specialized roofing and metalwork services for renovation projects.
• SEHED Bygg ABcoreStrategic or Co-development PartnerPart of SEHED Byggmästargruppen AB holding company. Main operating company within the construction group's network.
• SePu ABcoreStrategic or Co-development PartnerSpecialist company within SEHED-koncernen network. Part of the group of specialist contractors supporting Byggmästargruppen's operations.
• AFRYminorImplementation/ SI/ Consulting PartnerConsulting engineering firm involved as partner in Väsbyhem projects. Contributed to Hagängsvägen project as part of the collaboration team.
• HSB Strategisk FörvaltningcoreChannel Partner/ Reseller/ DistributorHSB's strategic management division providing advisory services to housing cooperatives. Advised Brf Lofoten on renovation methodology choice. Multiple ongoing collaborations including Brf Granen (433 apartments) and BRF Tellus (590 apartments).
• ByggföretagenminorImplementation/ SI/ Consulting PartnerSwedish Construction Federation providing industry training and initiatives including the Inkluderande arbetsliv (Inclusive Workplace) program. Byggmästargruppen was first member company to complete the organization's training for inclusive workplace practices.
• Behaviour Design GroupminorImplementation/ SI/ Consulting PartnerConsulting firm engaged by Byggföretagen to conduct workshops on inclusive workplace practices. Delivered training to Byggmästargruppen's entire staff during autumn 2021.
• Stockholms ByggmästareföreningminorImplementation/ SI/ Consulting PartnerLocal trade association for building contractors in Stockholm. Co-initiator of Fair Play Bygg initiative against crime and unfair competition in the construction industry.
• Byggnads Stockholm-GotlandminorImplementation/ SI/ Consulting PartnerLabor union co-initiating Fair Play Bygg initiative. Takes received tips and gathers information about crime, irregularities, and unfair competition in construction.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Market position

Competitive moat5 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UC2d1r5mkOCIh8DTsTEGEs-Q
• LinkedInlinkedin.com/company/byggm-stargruppen
• Xx.com/byggmastare
• Facebookfacebook.com/Byggmastargruppen

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 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 Byggmastargruppen