What Hydrostroy does

Hydrostroy AD ("Хидрострой" АД) is a Bulgarian construction and engineering company founded in 1964 (described in company materials as 1962), headquartered at 6 Tsar Osvoboditel Blvd in Sofia. It delivers infrastructure, building, hydraulic, and industrial construction projects for government and municipal clients, with a portfolio that includes roads, highways, bridges, tunnels, water and sewage systems, wastewater treatment plants, residential and public buildings, ports, airports, and railway infrastructure. The company reports a workforce of over 1,000 employees and claims more than 720 completed projects over 60+ years of operations.

The company operates a vertically integrated production chain spanning two licensed stone quarries (Kozya Polyana and Kalimantsi), a concrete production center in the Topoli industrial zone (Varna), multiple asphalt production bases in Varna and Sofia, a road-sign and metal-structure fabrication facility, an installation and reinforcement plant, and an ISO/IEC 17025-accredited road construction laboratory. This backward integration is supported by ISO 9001, ISO 14001, ISO 45001, ISO 39001 certifications and Bulgarian Construction Chamber execution rights covering Groups 1–5.

Hydrostroy's business model is sales-led and entirely B2B/government: revenue is generated through competitive public procurement tenders issued by Bulgarian municipalities, the Road Infrastructure Agency, and EU-funded operational programs in Bulgaria, Romania, North Macedonia, Hungary, Turkey, and the UAE. Branch offices exist in Sofia (HQ), Varna, Burgas, Skopje, Bucharest, Istanbul, and Dubai. The company is part of the "Hydrostroy corporate family," which includes affiliated entities Maveli JSC (real-estate investment, owner of the Sofia HQ building), VDH JSC (general construction), and Patstroy Burgas JSC (South-Eastern Bulgaria construction). Revenue is not publicly disclosed; the company is privately held.

Name

Hydrostroy

Legal name

"Хидрострой" АД (Hydrostroy AD)

Website

https://hydrostroy.com

Company type

Private

Founded year

1964

Operating status

Operating

Headcount range

11–50 employees

Short description

Hydrostroy AD is a Bulgarian construction and engineering company, founded 1964, that delivers roads, highways, hydraulic infrastructure, and public buildings for government and municipal clients in Bulgaria, Romania, and other EU markets through public procurement tenders, supported by vertically integrated quarries, concrete and asphalt plants, and an accredited materials laboratory.

Ownership category

akta.pro rank

Product category

Civil Engineering & Infrastructure Construction Services

NAICS

Water and Sewer Line and Related Structures Construction (237110), Highway, Street, and Bridge Construction (23731), Water and Sewer Line and Related Structures Construction (23711)

SIC

Water, Sewer, Pipeline, Comm & Power Line Construction (1623), Heavy Construction Other Than Bldg Const - Contractors (1600)

akta.pro primary industry

Water & Wastewater Pipeline Construction (Mains, Force Mains, Interceptors) (IMAFAGAC)

akta.pro secondary industries

Culverts, Bridges & Cross-Drainage Structures (Hydraulic Capacity & Rehabilitation) (EUANAEAC), Pump Stations, Lift Stations & Booster Stations Construction (IMAFAGAD), Storage & Conveyance Structures (Reservoirs, Tanks, Culverts, Tunnels) (IMAFAGAE)

Keywords

• Transport infrastructure construction
• Public infrastructure services
• Construction materials manufacturing
• Road construction services
• Water supply construction

Headquarters

HQ city

Sofia

HQ country

Bulgaria

HQ region

Europe

Offices7 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Public Infrastructure Construction: Revenue from large-scale public infrastructure projects — roads, highways, bridges, tunnels — awarded through competitive government tenders in Bulgaria and EU markets.
2. Building Materials Production and Sale: Revenue from producing and selling construction materials — concrete, asphalt mixtures, stone aggregates, road signs, reinforcement products — both for own construction needs and external customers.
3. Engineering Services: Integrated engineering services including design, construction, author supervision, and project management for infrastructure and building projects.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Hydrostroy AD is a vertically integrated Bulgarian construction company that designs and builds transport infrastructure (roads, highways, bridges, tunnels), public infrastructure (water supply, sewerage, drainage), and residential, public, and industrial buildings. The company also operates its own quarries, concrete and asphalt production plants, a road signs and metal structures plant, an installation and reinforcement plant, and an accredited road construction laboratory, supporting both internal projects and external sales of construction materials.

Product overview

Hydrostroy AD is a Bulgarian construction conglomerate operating as a single unified company with integrated manufacturing and service capabilities. The company offers a comprehensive portfolio organized into four core construction service lines (transport infrastructure, public infrastructure, buildings and industrial construction, water supply and sewerage) supported by in-house manufacturing operations (concrete production, asphalt mixtures, road signs and metal structures, stone quarries, installation and reinforcement services) and quality control services (accredited road construction laboratory). The manufacturing capabilities serve as backward integration supporting the construction activities, while the engineering services provide project delivery from design through commissioning.

Differentiator

Problem solved

Functional benefit

Products and services

• Transport Infrastructure Construction Design, construction, and rehabilitation of roads, highways, bridges, and transport infrastructure for government and public-sector clients in Bulgaria and EU markets.
• Public Infrastructure Construction Construction and modernization of public infrastructure systems including water supply networks, sewage systems, and drainage facilities for municipalities.
• Buildings and Industrial Construction Design and construction of residential complexes, public buildings, hotels, and industrial facilities for private developers and corporate clients.
• Water Supply and Sewerage Systems Design, construction, and modernization of water pipelines, sewage systems, and wastewater treatment plants (WWTP) for municipal and government clients.
• Concrete Production Production of concrete and concrete products at company-owned concrete centers in the Varna region, sold for own construction use and to external customers.
• Asphalt Mixture Production Production and sale of asphalt mixtures at company-owned asphalt plants in the Varna and Sofia regions for road construction.
• Road Signs and Metal Structures Manufacturing Production and installation of road signs, metal constructions, steel structures, fencing networks, and gabions for infrastructure and building projects.
• Stone Quarries (Kozya Polyana and Kalimantsi) Extraction and production of stone aggregates at company-owned quarries in the Varna region for construction use and external supply.
• Installation and Reinforcement Plant Production and installation of steel structures for buildings, gates, fencing, scaffolding, and industrial applications, including rebar processing and gabion mesh installation.
• Road Construction Laboratory Accredited testing laboratory for road construction materials operating under ISO/IEC 17025:2018, providing quality control for internal and external projects.
• Engineering Services Complete engineering services including design, construction, maintenance, and commissioning of electrical equipment, irrigation systems, and infrastructure projects.
• Port, Airport, and Railway Infrastructure Construction Design, construction, maintenance, and repair of port facilities, airports, and railway infrastructure for public-sector clients.

Quantifiable outcome

• 720+ completed projects delivered over 60+ years of operations
• +3 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

Feature9 records

Partnerships

Seven partnerships are on record, tiered minor and core.

• MARISTAR SRLminorStrategic or Co-development Partner · 1 January 2024Joint venture with Romanian contractor MARISTAR SRL to implement rehabilitation works at the Borcea junction on Highway A2 (EUR 13.8M).
• STRASSE SRL / SC EUROSTRADA SRL / SC PERFECT CONSULT EUROPE SRLcoreStrategic or Co-development Partner · 1 January 2024Consortium of Hydrostroy AD and three Romanian firms (STRASSE, EUROSTRADA, PERFECT CONSULT EUROPE) executed the Sfantu Gheorghe bypass (11.56 km, BGN 289.4M lei) — the largest infrastructure investment in Covasna County since the 1990s.
• HPVS-SST Consortium (Hidrostroy AD, Patni Stroezhi Veliko Tarnovo AD, Patinzheneringstroy AD, Patstroy Burgas EOOD, Vodstroy 98 AD)coreStrategic or Co-development Partner · 1 September 2016The HPVS-SST consortium was formed to deliver the Northern Speed Tangent Sofia project (16.54 km, BGN 180M). Hydrostroy AD served as one of the five consortium partners, each contributing specialized construction capabilities to this major Sofia infrastructure project.
• AQUA PARK / MAVGO HOLDING SRL / SPC ELITE CONSULTING SRL / IDEAL WINDOWS SRLminorStrategic or Co-development Partner · 26 February 2015Joint venture formed to execute the rehabilitation and modernization of county road DJ 242 in Romania (EUR 6.4M). Hydrostroy AD participated as one of five contractors alongside Romanian firms.
• VDH JSCcoreOthersVDH JSC is a national leader in Bulgarian construction of public service, energy, transport, and water/sewerage infrastructure, residential and public buildings, sports and entertainment centers, and hydro-engineering projects. VDH is part of the Hydrostroy corporate family.
• Maveli JSCcoreOthersMaveli JSC is a Bulgarian investment company established in 2006 that invests in purchase, sale, development, and construction of real estate — residential buildings, shopping centers, hotels, and business buildings. Maveli JSC is the owner of Hydrostroy's corporate headquarters building (6 Tsar Osvoboditel Blvd, Sofia). Part of the Hydrostroy corporate family.
• Patstroy Burgas JSCminorOthersPatstroy Burgas JSC is one of the leading construction companies in South-Eastern Bulgaria, specializing in construction, current repairs, and maintenance of buildings, roads, and technical infrastructure, hydro-technical facilities, and water supply networks. Related enterprise within the Hydrostroy group.

Scale indicators10 records

Recent moves6 records

Expansion highlights5 records

Others

• Patstroy Burgas JSC: Part of the Hydrostroy corporate family — specializes in construction, repairs, and maintenance of buildings, roads, technical infrastructure, and water supply networks in South-Eastern Bulgaria. Related-party peer providing regional comparability within Bulgaria.
• VDH JSC: Bulgarian national construction leader in public service, energy, transport, and water/sewerage infrastructure, part of the Hydrostroy corporate family. Comparable product lines and customer base but operates within the same corporate group.

Broad incumbents

• PORR AG: Austrian full-service construction company with strong presence in Central and Eastern European infrastructure markets, including roads, bridges, and environmental engineering. Comparable in service mix and cross-border EU project execution.
• Strabag SE: Austrian-based European construction leader with extensive transport infrastructure, water, and civil engineering operations across Central and Eastern Europe. Comparable service breadth but at much larger scale and with broader geographic reach, often competing for the same EU-funded tenders in Bulgaria and Romania.
• Colas SA: Bouygues subsidiary and one of the world's largest road construction and maintenance companies, with operations across Europe including road paving, aggregates, and bitumen-derived materials. Highly relevant comparator for Hydrostroy's transport infrastructure and asphalt production verticals.
• Eurovia SA: Vinci subsidiary specializing in transport infrastructure construction and maintenance, road materials production (aggregates, asphalt, binders), and urban development. Directly comparable to Hydrostroy's road construction and materials manufacturing integration model, though at significantly larger scale.

Direct peers

• Trace Group Hold plc: Bulgarian construction company specializing in transport infrastructure (roads, highways, bridges) and water/sewerage systems, with significant EU-funded project execution in Bulgaria and Romania. Closely comparable by geography, service mix, and reliance on public procurement tenders.
• Glavbolgarstroy AD: Bulgaria's largest construction company with vertically integrated operations across transport infrastructure, hydro-technical projects, building construction, and materials production. Comparable scale, diversified portfolio, and similar public-sector customer base.

Regional players

• Aktor SA: Greek construction company with strong presence in roads, highways, bridges, and environmental/water projects across the Balkans and SEE region. Comparable project profile and reliance on EU-co-financed public tenders in southeastern European markets.
• Metrostav a.s. Czech Republic's largest construction company operating across transport infrastructure, underground works, and building construction, with selective international activity in Eastern Europe. Comparable integrated civil engineering and infrastructure execution model, focused on Central Europe.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/hydrostroy-ad

Compliance14 records

Revenue estimate

Valuation estimate

Number of profiles

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 Hydrostroy