Interoc

What Interoc does

Interoc is a privately held Swedish renovation services company specializing in the renovation of the building exterior climate shell, with focus on windows, doors, and facades. Founded in 1962 as Opus Mur & Puts, the company serves housing cooperatives (bostadsrättsföreningar), municipal public housing companies (allmännyttan), government property owners, and educational institutions across Sweden, operating through five regional offices (Mälardalen, Väst, Dalarna, Syd, Norr) and a dedicated service department. The company offers four integrated service lines: Dörr & Fönsterbyte (door and window replacement), Fasadrenovering (facade renovation including insulation, rendering, and brickwork restoration), Klimatskal (comprehensive building envelope renovation coordinating roof, facade, windows, doors, and foundation insulation), and Service (post-project maintenance and warranty support). Notable technical capabilities include supplier-independent window selection, environmental facade washing using superheated steam above 150°C without chemicals, PCB and asbestos remediation, and energy calculations performed before and after window replacement.

The business operates on a project-based pricing model with free initial consultation and quote-based billing following on-site assessment, typically under multi-year framework agreements with institutional buyers. Interoc has been an HBV framework supplier since 2011, one of HBV's largest window suppliers, and operates an annual throughput exceeding 25,000 windows installed and more than 600 completed window replacement projects. Customer outcomes include documented energy savings up to 30% versus older 2-glass windows and noise reduction of approximately 5 decibels. The company has renovated culturally significant Stockholm buildings including the Opera, Dramaten, Aula Magna, and properties in Gamla Stan and Skeppsholmen, reflecting its heritage specialization. Following the 2022 acquisition by Corteco (formed in partnership with investment firm Celero), Interoc operates as part of a roll-up platform for exterior property maintenance specialists, with prior owners retaining co-ownership of Corteco. As of April 2024, the operating entities Interoc Fasad AB and Interoc DFF AB were merged into a consolidated Interoc Dörr & Fönster AB, planned to be renamed Interoc AB, under newly appointed CEO Andreas Hjertzell (formerly of Serneke Sverige AB).

Name

Interoc

Legal name

Interoc Dörr & Fönster AB

Website

https://interoc.se

Company type

Private

Founded year

1962

Operating status

Operating

Headcount range

51–100 employees

Short description

Interoc is a Swedish renovation specialist founded in 1962, offering window, door, and facade replacement and climate shell renovation services for housing cooperatives, public housing companies, and government property owners nationwide through five regional offices, operating within the Corteco group.

Ownership category

akta.pro rank

Headquarters

HQ city

Stockholm

HQ country

Sweden

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Facade renovation services: Complete facade renovation including additional insulation, rendering, brickwork restoration, and balcony renovation for housing cooperatives and property owners.
2. Door and window replacement: Supply and installation of windows and doors including wood, wood/aluminum, and composite materials. Includes demolition of old units and professional installation.
3. Service and maintenance: Post-project service including repair of minor facade damage, door and window adjustments, glass replacement, and annual maintenance for warranty compliance.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

Interoc is a Swedish renovation specialist delivering window and door replacement, facade renovation, and complete building envelope (klimatskal) renovation services. The company serves housing cooperatives (brf), public housing companies (allmännyttan), government property owners, and private property owners nationwide through five regional offices. It supplies and installs wood, wood/aluminum, and composite windows and doors, performs facade insulation, rendering, brickwork, and balcony renovation, and provides aftercare maintenance with hazard remediation (PCB, asbestos).

Product overview

Interoc is a specialized construction and renovation company offering four integrated service lines: Door & Window Replacement (Dörr & Fönsterbyte), Facade Renovation (Fasadrenovering), Building Envelope Renovation (Klimatskal), and Aftercare Service. The core offering combines facade and window/door services, with Klimatskal serving as the comprehensive umbrella offering that coordinates all exterior building work including roofs, facades, windows, doors, and foundations. The Service module provides ongoing maintenance and warranty support post-project. Interoc operates nationwide through five regional offices (Mälardalen, Väst, Dalarna, Syd, Norr) and serves housing associations, public housing companies, and property owners. Founded in 1962, the company has completed over 600 window replacement projects and hundreds of facade renovations across Sweden.

Differentiator

Problem solved

Functional benefit

Products and services

• Dörr & Fönsterbyte (Door & Window Replacement) Complete door and window replacement services for residential associations (brf), public housing companies, and property owners across Sweden. Includes supplier-independent selection of wood, wood/aluminum, and composite windows, demolition of old units, professional installation, energy calculations, and PCB/asbestos remediation coordination.
• Fasadrenovering (Facade Renovation) Facade renovation services including additional insulation, rendering, brickwork, balcony renovation, and restoration of historic buildings. Specializes in energy-efficient upgrades for million program properties and culturally significant buildings such as the Stockholm Opera and Dramaten.
• Klimatskal (Building Envelope Renovation) Complete building envelope renovation coordinating all exterior work including roof, facade, windows, doors, and foundation insulation. Includes project planning, energy calculations, and remediation of PCB and asbestos under one delivery.
• Service (Aftercare & Maintenance) Post-project aftercare and maintenance services for facades, doors, and windows including minor repairs, inspections, graffiti removal, glass replacement, adjustments, and annual maintenance. Also handles warranty claims and compliance inspections.

Quantifiable outcome

• Energy savings up to 30% compared to older 2-glass windows
• +4 more outcomes

Named customers14 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

Feature3 records

Partnerships

Two partnerships are on record, tiered minor and core.

• CCBuild (Centrum för cirkulärt byggande)minorStrategic or Co-development Partner · 1 January 2024Interoc joined CCBuild to drive sustainability work and reduce climate footprint. Through this industry arena, Interoc can learn and collaborate with other member organizations to reduce waste and promote continued use of materials. Access to training, knowledge bank, and digital services including inventory app, product bank, and marketplace.
• HBV (Allmännyttans inköpsorganisation)coreChannel Partner/ Reseller/ Distributor · 1 January 2011Interoc Dörr & Fönster has had framework agreements with HBV since 2011, making it one of HBV's largest suppliers. Members can directly order window replacements through the agreement. In 2023, Interoc won an additional agreement for composite windows, now offering a complete range.

Scale indicators5 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Veidekke: Nordic construction and civil engineering group with Swedish operations covering renovation, facade, and residential contracting for housing owners; comparable operating model serving similar brf/public-housing customers in the Nordics.
• Serneke: Swedish construction group active in building, civil, and renovation across Sweden; Interoc's incoming CEO Andreas Hjertzell was previously Arbetschef at Serneke Sverige AB, illustrating direct comparability of business model and customer base.
• Peab: Major Swedish construction group that previously owned Opus Mur & Puts (Interoc's 1962 founding entity); operates nationwide renovation, facade, and window-installation services for housing companies, making it a directly comparable contractor in the same customer base.
• NCC: One of Sweden's largest construction and property-development groups with significant renovation and facade works for housing companies; directly comparable as a general/renovation contractor serving Swedish public housing and brf segments.
• Wästbygg: Swedish construction and project-development group with a renovation/extension business line; comparable mid-sized contractor competing for similar brf and public-housing renovation mandates across Sweden.
• Derome: Swedish family-owned building-materials producer and contractor group with facade, window, and renovation offerings for residential and commercial customers; directly comparable in the window/facade renovation space Interoc serves.

Others

• Byggmax: Swedish building-materials retailer serving DIY and small-contractor customers; an ecosystem participant and potential upstream/downstream adjacency rather than a direct contractor competitor.

Regional players

• Bonava: Swedish-headquartered residential developer with operations across the Nordics and Baltic; adjacent rather than overlapping given its focus on new development, but a relevant comparable for property-owner customer relationships in the region.
• JM: Sweden-focused residential developer and contractor; primarily new-build but with adjacent renovation activities and overlapping customer relationships with Swedish housing companies.

Broad incumbents

• Skanska: Sweden-headquartered global construction and project-development group with broad portfolio including commercial, residential, and renovation; overlaps with Interoc on public-sector and residential renovation but operates as a broad incumbent rather than a specialist.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/interoc

Revenue estimate

Valuation estimate

Number of profiles

Profiles13 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 Interoc