Fullflow

What Fullflow does

Fullflow is a Sheffield-headquartered specialist contractor that designs, manufactures, installs, and project-manages bespoke siphonic roof drainage systems for commercial, industrial, sports, and infrastructure buildings. Founded in 1986 and operating as Fullflow Group Limited (UK) with Fullflow International Limited (Spain), the firm targets enterprise construction clients — architects, developers, and main contractors — on projects where conventional gravity drainage is insufficient, such as large unbroken roof areas, complex geometries, or buildings requiring maximised internal space.

The company's technology stack rests on three proprietary assets: the BBA-approved Primaflow series of siphonic outlets (developed through PhD research at the University of Sheffield with patented leafguards and baffle plates), the Primacalc hydraulic design software (independently approved by BAA and Nottingham University, compliant with BS8490, and now embedded within Revit for BIM-integrated workflows), and a UKAS-accredited Railing System that handles thermal expansion on long pipe runs. Manufacturing is vertically integrated through wholly-owned sister company Plasflow, which operates CNC-controlled polyethylene fabrication in an ISO 9001-accredited facility, with modular kits delivered to site for assembly. The portfolio is supported by a stack of certifications (ISO 9001, ISO 14001, BBA, SafeContractor, SSIP, SRDA full membership) and a JIB-accredited installer training programme.

Fullflow earns revenue through one-off project-based contracts combining hardware supply, BIM/CAD design services, and installation — a turnkey model with pricing set per engagement. Recent flagship references include the UK Pavilion at Expo 2025 Osaka, the £900M SeAH Wind Monopile Factory, the £800M Hill Dickinson Stadium (Everton FC), One Bishopsgate Plaza, the Aldi Bardon distribution centre, and Eastbrook Studios, indicating access to mega-project specifications across diverse sectors. The firm markets primarily through project showcases, downloadable technical resources, and direct enterprise sales rather than mass-market channels.

Name

Fullflow

Legal name

Fullflow Group Limited

Website

https://fullflow.com

Company type

Private

Founded year

1986

Operating status

Operating

Headcount range

11–50 employees

Short description

Fullflow is a UK-based specialist contractor that designs, manufactures, and installs bespoke siphonic roof drainage systems for enterprise construction projects. It serves architects, developers, and main contractors on large commercial, industrial, sports, and infrastructure buildings worldwide.

Ownership category

akta.pro rank

Product category

Siphonic Roof Drainage Systems

NAICS

Water and Sewer Line and Related Structures Construction (237110), Roofing Contractors (238160)

SIC

Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Gutters, Downspouts & Drainage (Install/Repair) (HSAPAKAG)

akta.pro secondary industry

Roof Drainage Components Repair (Gutters/Downspouts/Scuppers as Roof-Related) (HSAGAKAL)

Keywords

• Siphonic roof drainage
• Rainwater management systems
• BIM drainage design
• Polyethylene pipe fabrication
• Construction project installation

Headquarters

HQ city

Sheffield

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Siphonic Roof Drainage Systems: Fullflow generates revenue through the design, manufacture, and installation of bespoke siphonic rainwater drainage systems for construction projects. The company operates on a project-based model delivering custom solutions across commercial, industrial, and infrastructure sectors.
2. Design Services: BIM design services including Revit modeling, CAD/SolidWorks drawings, and Primacalc hydraulic calculations provided as part of the overall project delivery.
3. Modular Manufacturing: Modular fabrication of siphonic system components manufactured by sister company Plasflow in CNC-controlled facilities, delivered to site for assembly.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Fullflow designs, manufactures, installs, and project-manages bespoke siphonic roof drainage systems for construction projects. The company provides direct lifecycle delivery from initial system design and engineering through component fabrication, on-site assembly, and completion.

Product overview

Fullflow offers a unified portfolio of bespoke siphonic rainwater drainage solutions, comprising proprietary outlets (Primaflow, Trimline, Tholoflow), the UKAS-accredited Railing System for pipe support, and complete siphonic drainage systems. These products are supported by Primacalc Design Software (integrated with Revit BIM), CAD/SolidWorks design services, and modular manufacturing via sister company Plasflow. The company provides a turnkey service from design through manufacture to installation.

Differentiator

Problem solved

Functional benefit

Brands

• Primaflow: BBA-approved series of siphonic rainwater outlets developed through PhD research at University of Sheffield, featuring uniquely dimensioned leafguards and internal baffle plates
• Primacalc

Products and services

• Primaflow Outlet BBA-approved siphonic rainwater outlet with uniquely dimensioned leafguards and internal baffle plates, designed to minimize air and debris entry and optimize hydraulic performance across roof configurations.
• Trimline Outlet Siphonic rainwater outlet designed for specific installation requirements, with clamp ring options for secure membrane connections.
• Tholoflow Outlet Siphonic rainwater outlet variant with a clamp ring option for roof-membrane integration.
• Railing System UKAS-accredited pipe-support system combining close-tolerance clips with an expansion-controlling rail to provide continuous support and restraint along polyethylene pipe lengths, absorb thermal forces, and minimize movement in long pipe runs.
• Siphonic Roof Drainage System Complete siphonic rainwater drainage system engineered with Fullflow's proprietary hydraulic design software to achieve full-bore flow and increased flow efficiency, delivered in modular form for on-site assembly.
• Primacalc Design Software Proprietary BIM-integrated software for designing siphonic roof drainage systems. It is independently approved by BAA and Nottingham University, compliant with BS 8490, and embedded in Revit with automatic pipe-diameter calculations.
• Plasflow Bespoke Manufacturing Bespoke plastic fabrication service for complex construction projects, specializing in pipes, fittings, tanks, and vessels made from polyethylene and polypropylene through CNC-controlled facilities.
• Fullflow Design Services BIM design services for siphonic roof drainage projects using Revit, CAD and SolidWorks drawings, detailed material lists, and Primacalc hydraulic calculations.
• Turnkey Siphonic Drainage Project Delivery Project-based service covering bespoke siphonic drainage-system design, manufacture, installation, technical coordination, and project management from concept to completion.

Quantifiable outcome

• Larger roof areas can be drained compared to conventional systems
• +4 more outcomes

Named customers6 records

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

Feature4 records

Partnerships

One partnership is on record.

• PlasflowcoreStrategic or Co-development PartnerPlasflow is Fullflow's sister company and plastic fabrication operation, serving as their primary manufacturing partner. It is one of the UK's leading plastic fabricators specialising in pipes, fittings, tanks, and vessels in polyethylene and polypropylene for non-pressure applications. Plasflow operates from one of the largest, best-equipped fabrication facilities in the UK within a BS EN ISO 9001 accredited environment, providing bespoke manufacturing support for complex projects.

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Marley Plumbing & Drainage: UK rainwater and soil drainage systems supplier with established presence in commercial and residential roof drainage. Competes in adjacent segments to Fullflow on UK commercial and infrastructure projects.
• Geberit: Large European sanitary and drainage systems incumbent with siphonic roof drainage offerings embedded within a much broader plumbing portfolio. Competes with Fullflow on commercial drainage specifications but operates at materially greater scale.
• Aliaxis: Global plastic pipe and drainage systems group encompassing brands such as IPEX, Durman, and Philmac. Operates broadly in building drainage including siphonic systems, with comparable project-based delivery on large commercial roofs.
• Polypipe (Genuit Group): UK plastic piping systems manufacturer with rainwater and siphonic drainage solutions as part of a broad civils and building products portfolio. Adjacent incumbent competitor serving overlapping UK commercial and infrastructure projects.

Direct peers

• Wavin (Orbia): Global manufacturer offering QuickStream siphonic roof drainage systems with full design, manufacture, and installation services. Directly competes with Fullflow in siphonic roof drainage for large commercial and industrial buildings across Europe and globally.
• Valsir: Italian manufacturer of siphonic roof drainage (Rainplus) and broader plumbing/drainage systems. Directly competes with Fullflow on European commercial siphonic projects, with overlapping design software and outlet product portfolios.
• ACO Drain: Global drainage specialist offering siphonic roof drainage (ACO Jet) alongside surface and building drainage. Comparable product portfolio and customer base to Fullflow, with broader geographic reach.
• Alumasc Water Management Solutions: UK-based provider of rainwater management solutions including siphonic and gravity drainage systems. Closest direct UK competitor to Fullflow, serving the same architects, developers, and main contractors on commercial roofing projects.

Others

• Sika Roofing: Global roofing and waterproofing systems provider. Adjacent rather than directly competitive — Sika's roofing membranes and waterproofing are often installed alongside siphonic drainage outlets on the same large commercial projects Fullflow serves.

Regional players

• Siphonic Systems Australia: Asia-Pacific siphonic roof drainage specialist offering design, supply, and installation services. Comparable technology and project delivery model to Fullflow but focused on Australian and Asian markets rather than the UK/Europe.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/fullflowgroup
• LinkedInlinkedin.com/company/fullflow-group-ltd

Compliance11 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

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 Fullflow