What Kilwaughter Minerals does

Kilwaughter Minerals Limited is a quarry and mineral processor headquartered on a 187-acre site in Larne, Co. Antrim, Northern Ireland, founded in 1939 and now operating as a wholly-owned subsidiary of Saint-Gobain following the December 2024 acquisition. The business runs four manufacturing and distribution locations across the UK and Ireland (Larne HQ, Ovens Co. Cork, Glasgow, and St. Helens) and is organised around four market-facing brands: K Rend (the UK and Ireland's largest independent silicone render manufacturer), K Systems (External Wall Insulation system designer and manufacturer), Kilwaughter Lime (calcium carbonate-based agricultural and animal health products), and K Landscapes (decorative paving and stone via its Cork showroom).

The core technology stack is calcium carbonate quarrying and mineral processing feeding into proprietary cement-replacement render formulations (K Rend Eco Range delivering up to 56% embodied carbon reduction), silicone render systems, and integrated External Wall Insulation systems for new build and refurbishment. Supporting capabilities include K Academy, a CPD-certified training platform covering PAS 2035/2030 and EWI standards for architects and applicators, and the Soil Health Hub digital platform serving the agriculture segment. Operations are certified to ISO 9001, ISO 14001, and ISO 45001 standards.

Revenue is generated through one-time sales of manufactured construction and agricultural products to B2B customers (builders, contractors, merchants, specifiers, and farmers) under quote-based pricing with 30-day account credit terms, supplemented by CPD training services delivered via K Academy. Pricing is not publicly disclosed and is negotiated per order, with escalator clauses on long-dated orders. The company employs approximately 200 people and serves customers across construction (primary), agriculture, and landscaping segments in the UK and Ireland; in March 2025 it was consolidated with Weber under the Saint-Gobain Exterior Solutions brand.

Name

Kilwaughter Minerals

Legal name

Kilwaughter Minerals Limited

Website

https://kilwaughter.com

Company type

Private

Founded year

1939

Operating status

Operating

Headcount range

51–100 employees

Short description

Kilwaughter Minerals is a Northern Ireland-based quarry and mineral processor, since December 2024 a subsidiary of Saint-Gobain, manufacturing silicone renders (K Rend), External Wall Insulation systems (K Systems), agricultural lime (Kilwaughter Lime), and decorative landscaping products (K Landscapes) for construction, agriculture, and landscaping customers across the UK and Ireland.

Ownership category

akta.pro rank

Product category

Construction Materials

NAICS

Ground or Treated Mineral and Earth Manufacturing (327992), All Other Nonmetallic Mineral Product Manufacturing (32799), Clay Product and Refractory Manufacturing (3271), Lime Manufacturing (32741)

SIC

Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400), Abrasive, Asbestos & Misc Nonmetallic Mineral Prods (3290), Cut Stone & Stone Products (3281)

akta.pro primary industry

Limestone Quarrying (Industrial & Construction Grade) (IMAKAHAC)

akta.pro secondary industries

Mineral & Rock Dust Amendments (Basalt, Rock Phosphate, Greensand) (AFABADAJ), Mineral/Particulate Thickeners (Silicates, Clays, Calcium Carbonate as texturizers) (AFAJAMAJ)

Keywords

• Silicone render manufacturing
• External wall insulation systems
• Construction mineral products
• Agricultural lime products
• Quarry mineral processing

Headquarters

HQ city

Heath

HQ country

United Kingdom

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Construction Mineral Product Sales: Direct sale of manufactured construction products including renders, mortars, EWI systems, lime, and aggregates to builders, contractors, merchants, and specifiers across the UK and Ireland. Products are sold via account relationships with standard 30-day payment terms.
2. Agricultural Lime and Landscape Products: Sale of calcium carbonate-based products to the agricultural and landscaping sectors including soil health products, Kilwaughter Lime brand, and K Landscapes decorative stone and paving products.
3. CPD Training and Education (K Academy): CPD seminars and training courses for architects and construction professionals through K Academy, covering render application, PAS 2035, EWI, and external wall insulation topics.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels5 records

Core offering

Kilwaughter Minerals is a quarry and mineral processor that manufactures calcium carbonate-based construction and agricultural products. Its core offerings are organized under four market-facing brands: K Rend (silicone renders, mortars, and façade coatings), K Systems (External Wall Insulation systems), Kilwaughter Lime (agricultural and soil health lime products), and K Landscapes (decorative paving and stone). The company also operates K Academy, a CPD training platform for construction professionals.

Product overview

Kilwaughter Minerals is a quarry and mineral processor that operates as a multi-brand portfolio company. Its core offerings are organized under four market-facing brands: K Rend (the UK's and Ireland's largest independent silicone render manufacturer, supplying façade mortars, renders, mortars, and external coatings), K Systems (External Wall Insulation systems designer and manufacturer for sustainable buildings), Kilwaughter Lime (calcium carbonate and lime products for agriculture, soil health, and animal health), and K Landscapes (decorative paving, stone, and outdoor products via a Cork-based showroom). The company also offers K Academy, a training and CPD facility for construction professionals. In 2024, K Rend launched the Eco Range (reduced cement products with up to 56% embodied carbon reduction) and K1 Spray+ (innovative spray render). Manufacturing is headquartered on a 187-acre site in Larne, Co Antrim, Northern Ireland, with three distribution centres across the Republic of Ireland, Scotland, and England. The company became part of the Saint-Gobain group in December 2024.

Differentiator

Problem solved

Functional benefit

Brands

• K Rend: UK and Ireland's largest silicone render manufacturer. Part of Saint-Gobain Exterior Solutions.
• K Systems
• Kilwaughter Lime
• K Landscapes

Products and services

• K Rend K Rend is the UK's and Ireland's largest independent silicone render manufacturer, supplying façade mortars including high-performance renders, mortars, and external coatings for the construction industry.
• K Systems K Systems is a manufacturer and system designer of External Wall Insulation (EWI), providing solutions that enable sustainable homes through energy-efficient building envelope systems.
• Kilwaughter Lime Kilwaughter Lime supplies calcium carbonate-based and lime products to the agriculture industry, focusing on soil health and animal health applications.
• K Landscapes K Landscapes is a landscaping products brand offering decorative paving, stone, and outdoor space transformation products through its showroom in Cork, Ireland.
• K Academy K Academy is Kilwaughter Minerals' training and professional development facility, offering CPD seminars for architects and construction professionals on render application, EWI systems, PAS 2035 & 2030, and related construction standards.
• K Rend Eco Range K Rend Eco Range is a suite of reduced cement render and mortar products using innovative cement replacement technology, including K Post, GP Mix, and Mineral TC, reducing embodied carbon by up to 56%.
• K1 Spray+ K1 Spray+ is an innovative spray render product from K Rend designed to set a new standard within the construction industry.
• GP Mix GP Mix is a versatile grey ready-mixed product which can be used as a render, mortar or plaster with improved workability and faster drying times, part of the K Rend Eco Range.
• Soil Health Hub Soil Health Hub is an innovative service launched by Kilwaughter Minerals to support farmers with soil health solutions under the Kilwaughter Lime brand.
• Calcium carbonate-based construction products Calcium carbonate-based products including limestone sands, aggregates, and derivative products for construction and broader industry applications.

Quantifiable outcome

• K Rend Eco Range reduces embodied carbon by up to 56% compared to standard products
• +2 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Ten partnerships are on record, tiered core, flagship and minor.

• Larne Athletic ClubcoreGTM or Marketing Partner · 14 April 2025Kilwaughter Minerals has been a longstanding supporter of the Larne Athletic Club 10 Mile Race. The partnership involves headline sponsorship of the annual race event, with portions of proceeds donated to St John Ambulance. In 2026, the event continues under Saint-Gobain Exterior Solutions branding.
• Saint-GobainflagshipOthers · 3 December 2024Saint-Gobain completed the acquisition of Kilwaughter Minerals in December 2024 following regulatory approval. Kilwaughter joined the Saint-Gobain group as part of Saint-Gobain Exterior Solutions alongside Weber. The acquisition strengthens Saint-Gobain's light and sustainable construction solutions for the building envelope. K Rend and K Systems brands continue to operate and trade as normal under the Saint-Gobain Exterior Solutions umbrella.
• Power NIminorOthers · 1 January 2024Kilwaughter Minerals announced a major 100% renewable energy deal with Power NI for its Larne headquarters, marking a significant milestone in its sustainability journey.
• Air Ambulance NIminorGTM or Marketing Partner · 1 January 2023Kilwaughter Minerals confirmed a £20,000 donation to Air Ambulance NI, continuing its support of the life-saving charity.
• Brighter Futures (Larne FC)coreGTM or Marketing PartnerKilwaughter Minerals is a major benefactor to Brighter Futures, Larne Football Club's official charity community fund. The company committed £40,000 total to the programme (£20,000 initial plus £20,000 renewal), supporting group and community projects across Larne in Sport and Recreation, Business Enterprise, Education and Training, and Community Needs categories.
• Queen's University BelfastcoreStrategic or Co-development PartnerKilwaughter Minerals partnered with Queen's University Belfast on the Pathway Opportunity Programme, an innovative collaboration bringing new skills to young people in Larne. This partnership was shortlisted for Corporate Social Responsibility Programme of the Year at the Irish News Workplace and Employment Awards.
• Olderfleet Primary SchoolminorGTM or Marketing PartnerThrough Brighter Futures funding, Kilwaughter Minerals supported the establishment of a new ICT suite at Olderfleet Primary School, Larne, enabling digital learning for pupils.
• Larne Grammar SchoolminorGTM or Marketing PartnerKilwaughter Minerals partnered with Larne Grammar School to provide careers insight sessions and tours of its facilities, supporting skills pipeline development for the manufacturing and construction industry.
• LEDCOMminorStrategic or Co-development PartnerEconomic impact of LEDCOM services and clients reaches almost £19m, with Kilwaughter Minerals featured in LEDCOM news as part of the local business ecosystem.
• Business in the Community (Northern Ireland)minorGTM or Marketing PartnerKilwaughter Minerals is a member of Business in the Community Northern Ireland, participating in the Responsible Business Awards and Environmental Benchmarking Survey (Gold Status achieved).

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Saint-Gobain Weber: Saint-Gobain's external wall insulation (EWI) and render brand, now a sibling entity under Saint-Gobain Exterior Solutions alongside Kilwaughter. Directly competes with K Systems and K Rend in the UK and Irish EWI and render markets, with five combined 2025 INCA Award wins.
• Wetherby Building Systems: UK-based manufacturer of external wall insulation (EWI) systems, renders, and façade finishes. Direct competitor to K Systems in the British EWI refurbishment and new-build segments.
• Sto SE & Co. KGaA: German-headquartered manufacturer of external wall insulation systems, silicone and acrylic renders, and façade coatings. Closest European direct competitor to K Rend in silicone render technology and to K Systems in EWI system design.
• Baumit: Austrian manufacturer of façade systems, renders, mortars, and EWI solutions with strong presence in central Europe and Ireland. Direct competitor in the silicone render and EWI categories that anchor Kilwaughter's K Rend and K Systems brands.
• Singleton Birch: UK-based limestone quarrying and lime production company supplying quicklime, hydrated lime, and chalk-based products to construction, agriculture, and industrial customers. Closest direct peer to Kilwaughter Lime's agricultural and construction lime franchise.

Broad incumbents

• Knauf: Global building materials group offering plasterboard, renders, EWI systems, and insulation. Overlaps with K Rend in render manufacturing and K Systems in EWI, though as part of a broader portfolio rather than a render/EWI specialist.
• Sika AG: Swiss specialty chemicals company supplying concrete admixtures, mortars, renders, and façade systems to the construction industry. Adjacent competitor in the render and mortar category serving similar contractor and merchant channels.
• Mapei SpA: Italian global manufacturer of construction chemicals including renders, mortars, adhesives, and façade systems. Competes in the render and mortar category through merchant and contractor channels across the UK and Ireland.

Regional players

• Breedon Group: UK and Ireland-listed aggregates and construction materials group operating quarries, ready-mixed concrete, and cement operations. Comparable as a vertically integrated quarry-to-construction-products business operating in the same UK and Irish geographies.
• Tarmac (CRH plc): UK division of CRH plc, supplying aggregates, cement, concrete, and lime products across Britain. Comparable as a vertically integrated minerals and construction products operator in the same UK geography and overlapping lime/aggregates categories.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

Compliance3 records

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 Kilwaughter Minerals