Althon

What Althon does

Althon Limited, founded in 1982 and headquartered in Norwich, United Kingdom, is a specialist manufacturer of precast concrete headwalls and associated water management infrastructure for the construction industry. The company's product platform centres on precast concrete headwalls — the inlet and outlet structures for pipework discharging into attenuation ponds, rivers, ditches, swales, and tidal environments — supplemented by HDPE/SS316L penstocks, flap valves, duckbill valves, stoplogs, orifice plates, trash screens, drainage channels, and bespoke metalwork. The company employs a proprietary factory-fitting system that pre-casts fixing points and assembles accessories during manufacture, eliminating on-site drilling and reducing installation time. Manufacturing is carried out under BS 8500-2:2023 (low carbon concrete mix, Design Chemical Class 4 and Design Sulphate Class 4), with CARES-accredited reinforcement certified to BS EN 15258 where structural applications require it.

Althon sells primarily through direct B2B sales to construction contractors, civil engineers, housing developers (Barratt Homes, Bellway Homes), water authorities (Severn Trent Water, Anglian Water, United Utilities), and large infrastructure projects including HS2, Hinkley Point C, Sizewell C, Panama International Airport, RSPB Wallasea Island, and the Arbroath Flood Prevention Scheme. Products are sold via three channels: direct sales for bespoke units, an online shop (shop.althon.co.uk) for stock flow-control items, and a CAD-based headwall design service for custom configurations. Pricing is quote-based for bespoke products and unit-priced for online stock items; the company does not publicly disclose pricing.

Althon is a subsidiary of MAG Group Limited, a privately owned UK conglomerate with six subsidiaries concentrating on construction and retail specialist products, employing approximately 70 people in aggregate. MAG Group anticipated group turnover exceeding £25 million in 2023. The company operates internationally with projects delivered in over 50 countries including the UK, Panama, Rwanda, Mongolia, Georgia, Australia, Dubai, Qatar, the US, and Iraq, though the UK remains the primary market.

Name

Althon

Legal name

Althon Limited

Website

https://althon.co.uk

Company type

Private

Founded year

1982

Operating status

Operating

Headcount range

11–50 employees

Short description

Althon Limited, founded in 1982 and headquartered in Norwich UK, designs and manufactures precast concrete headwalls, penstocks, flap valves, and drainage products for UK and international construction contractors, water utilities, housing developers, and major infrastructure projects as part of the MAG Group.

Ownership category

akta.pro rank

Product category

Precast Concrete Drainage Infrastructure

NAICS

Concrete Pipe, Brick, and Block Manufacturing (32733), Concrete Pipe Manufacturing (327332), Cement and Concrete Product Manufacturing (3273)

SIC

Concrete Products, Except Block & Brick (3272), Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Precast Concrete Products (IMADAAAB)

akta.pro secondary industries

Concrete Pipe, Box Culverts & Drainage Structures (IMADAAAD), Storage & Conveyance Structures (Reservoirs, Tanks, Culverts, Tunnels) (IMAFAGAE)

Keywords

• Precast concrete headwalls
• Water management infrastructure
• Flow control valves
• Drainage channels
• Flood prevention products

Headquarters

HQ city

Norwich

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Pre-cast concrete products: B2B sales of precast concrete headwalls, outfall structures, penstock chambers, inspection chambers, and endwalls to construction contractors, developers, water authorities, and infrastructure companies. Products are sold as standard units or bespoke custom-manufactured to specifications.
2. Flow control valves and penstocks: Sales of HDPE flap valves, penstocks, stoplogs, duckbill valves, and associated flow control equipment. Available as standalone products or factory-fitted to precast concrete units.
3. Metalwork and gratings: Sales of trash screens, outfall safety grilles, handrails (Kee Klamp), and bespoke metalwork in galvanised steel or stainless steel.
4. Drainage channels: Sales of surface water drainage channels including concrete, polymer concrete, and GRP options for commercial and industrial applications from A15 to F900 load classes.
5. Design and specification services: Headwall design service providing CAD and PDF drawings for custom specifications including multiple pipe openings, varied backwall heights, and bespoke configurations.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

Althon designs and manufactures precast concrete headwalls and associated water management infrastructure for the construction industry. The product range includes standard, Sewers for Adoption (SFA), and bespoke headwall configurations, plus flow control products (penstocks, flap valves, duckbill valves), drainage channels, and factory-fitted accessories (gratings, trash screens, handrails). Products are sold directly to construction contractors, civil engineers, water authorities, housing developers, and infrastructure companies across the UK and internationally.

Product overview

Althon is a manufacturer and distributor of specialist water management products for the construction industry, operating as part of the MAG Group of Companies. The product portfolio centers on precast concrete headwalls as the core platform, supplemented by a comprehensive range of flow control and water management accessories. The headwall platform is available in multiple sub-variants (Standard, Sewers for Adoption/SFA, Rectangular RSFA, Angled, Culvert, Swale Inlet, and Bespoke configurations) to address different pipework, site, and regulatory requirements. Accessories that can be factory-fitted to headwalls include penstocks, flap valves, duckbill valves, stoplogs, orifice plates, gratings/trash screens, handrails (Kee Klamp), dissipation blocks, and baffle blocks. Supporting product lines include penstock manhole chambers, inspection chambers, endwalls, silt traps, and a drainage channel range. Products are available through a specification tool, a bespoke design service, and an online shop.

Differentiator

Problem solved

Functional benefit

Products and services

• Precast Concrete Headwalls

Quantifiable outcome

• Reduced installation time through factory-fitted accessories eliminating on-site drilling
• +3 more outcomes

Named customers12 records

Segments6 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• MAG Group LimitedcoreOthersAlthon Limited is a subsidiary company of MAG Group Limited, a privately owned UK-based business operating since 1982. MAG Group has 6 subsidiary companies concentrating on the manufacture and supply of specialist products for the construction industry and retail markets. MAG Group anticipates Group turnover to exceed £25 million in 2023.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• FP McCann: The UK's largest precast concrete manufacturer with a portfolio that includes box culverts, headwalls, drainage products and structural precast; directly comparable to Althon across precast concrete drainage and water management infrastructure.
• Wrekin Products: UK manufacturer of drainage and access products including manhole covers, gully gratings and related drainage accessories; comparable distribution channels, customer base, and product adjacency to Althon's metalwork and drainage offerings.
• JDP (John Davidson Pipes): UK distributor and manufacturer of drainage and water management products including pipe systems and access solutions; overlaps with Althon on drainage channels, access chambers and contractor customers.
• Stanton Precast: UK precast concrete manufacturer producing drainage products, headwalls and structural precast; directly comparable in product scope, customer base (utilities, contractors, developers) and technical specification requirements.
• Clark-Drain: UK manufacturer of access solutions and drainage products including manhole covers, gratings and channel drainage; comparable in product range, UK distribution model and construction customer base to Althon's metalwork and channel offerings.
• ACO Technologies: Specialist manufacturer of surface water drainage channels and systems with strong overlap on Althon's drainage channel range (load classes A15 to F900) and shared construction/infrastructure customer base.
• Naylor Drainage: UK manufacturer of clay and concrete drainage products including pipe systems and access chambers; comparable in scale and customer base to Althon within the UK drainage and water management value chain.

Broad incumbents

• Tarmac (CRH): Major UK construction materials group producing concrete, aggregates and drainage products; competes with Althon in precast concrete drainage and headwalls as part of a much larger materials portfolio.
• Marshalls plc: UK-listed building materials group with a water management division (linear drainage, channels, headwalls) serving similar construction and infrastructure customers, but operating at significantly larger scale across a broader product portfolio.
• Hanson UK (Heidelberg Materials): One of the UK's largest producers of concrete, aggregates and precast drainage products; competes with Althon in the precast concrete drainage and headwall category as part of a much wider construction materials portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/althon-limited
• Instagraminstagram.com/althon_drainage
• Facebookfacebook.com/althonltd

Compliance8 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 Althon