Celtic Sustainables Ltd is a specialist supplier of natural insulation, breathable paints, traditional lime products and environmentally conscious building materials. Based in Cardigan, West Wales, the company serves building conservation professionals, contractors, architects and property owners undertaking renovation, retrofit and new construction.
The business supplies products selected for their material characteristics, environmental considerations and suitability for particular construction applications. Its range includes natural and recycled insulation, lime mortars and plasters, mineral and clay paints, wood treatments, airtightness systems and associated construction materials.
Celtic Sustainables operates a shop and warehouse in Cardigan alongside its online distribution activities, supplying customers throughout the United Kingdom.
Natural and recycled insulation products form an important part of Celtic Sustainables' building-material range. These include materials manufactured from renewable agricultural resources, wood fibres and recycled textiles.
The company supplies insulation for walls, roofs, lofts and floors, including products relevant to the improvement of traditional buildings.
Its principal insulation categories include:
The company's product range includes insulation manufactured by specialist suppliers such as Thermafleece, IndiNature, SisalTech and manufacturers of wood-fibre insulation systems.
These materials offer alternatives to conventional insulation products, although their technical and environmental characteristics vary considerably. Selection should be based on the requirements of the building and the performance of the complete construction system.
Celtic Sustainables supplies materials relevant to the repair and improvement of traditionally constructed buildings, including properties with solid brick or stone walls, lime-based finishes, timber framing and suspended timber floors.
The conservation of such buildings requires an understanding of how existing materials respond to changes in temperature, humidity and moisture movement.
Conventional insulation systems and impermeable finishes may be unsuitable in particular circumstances, especially where moisture is present within traditional masonry or where alterations affect the drying characteristics of the building fabric.
Natural insulation, lime-based materials and vapour-permeable finishes may provide appropriate alternatives when selected and detailed following suitable investigation and assessment.
Potential applications include:
Insulation and finishing materials should be specified with regard to the existing building's construction, condition, architectural significance and exposure to moisture.
Alongside insulation, Celtic Sustainables supplies lime-based materials used in the repair, conservation and renovation of traditional buildings.
Its range includes hydraulic and non-hydraulic lime products, ready-mixed lime mortars, lime plasters, insulating renders and associated tools and materials.
Traditional lime materials are relevant to the repair of historic masonry where compatibility with existing mortars, bricks and stone is an important consideration.
The company's lime-related products include:
These products are relevant to conservation projects involving traditional masonry, historic plasterwork and the repair of buildings originally constructed with lime-based materials.
The appropriate mortar or plaster specification should take account of the strength, porosity and condition of the existing substrate, together with exposure conditions and the requirements of the conservation project.
Celtic Sustainables also supplies an extensive range of natural, mineral and environmentally conscious paints and decorative finishes.
These include clay paints, silicate paints, lime-compatible finishes, wood oils and other products used in traditional and contemporary buildings.
The company's catalogue includes products from established manufacturers such as Earthborn, Auro, KEIM, Beeck, Graphenstone and other specialist paint and finishing-material suppliers.
Principal categories include:
Breathable finishes can be particularly relevant to the conservation of traditional buildings where surface coatings must be compatible with lime plaster, render and historic masonry.
The term breathable should nevertheless be considered in relation to the actual vapour-permeability characteristics of a product and its compatibility with the underlying construction.
The company supplies airtightness and vapour-control products intended for use in energy-efficient construction and retrofit.
Its range includes specialist membranes, tapes, seals, grommets and associated materials used to control unintended air movement through building assemblies.
These products can form part of insulation systems where continuity of airtightness and appropriate moisture management are important to thermal performance and long-term durability.
Applications include:
The interaction between airtightness, ventilation and moisture movement requires particular attention in existing buildings. Improvements to airtightness should therefore be considered as part of a coordinated building-performance strategy.
Celtic Sustainables supplies products intended to support more resource-conscious approaches to construction, renovation and property maintenance.
Its catalogue includes materials incorporating renewable natural fibres, recycled resources and mineral-based components, together with products designed to improve thermal performance and reduce reliance on certain conventional construction materials.
The environmental characteristics of individual products depend on their composition, manufacture, transport, durability, maintenance requirements and eventual disposal or reuse.
Where environmental performance is a significant consideration, product selection should be informed by available technical information, relevant certifications and independently verified environmental data.
The company also supplies rainwater-harvesting products, including water-storage tanks, collection systems, filters and associated components.
These products extend its activities beyond insulation and decorative materials into the wider field of resource-efficient building operation.
Celtic Sustainables provides product information and practical guidance to homeowners, contractors and construction professionals seeking suitable sustainable building materials.
Its website includes product descriptions, technical information, installation guidance and articles concerning natural insulation, traditional building materials and environmentally conscious decorative finishes.
The company supplies materials through its online store and its premises in Cardigan, where customers can obtain information concerning available products and ordering requirements.
Technical documentation and installation instructions should be obtained for the particular materials being considered, especially where products form part of a certified or proprietary construction system.
Celtic Sustainables became a wholly employee-owned business in July 2026, with ownership transferred to an Employee Ownership Trust.
The ownership arrangement was introduced to support the long-term continuity of the business, retain its connection with Cardigan and provide employees with a shared interest in its future development.
The company continues to operate as a specialist supplier of sustainable building materials, natural insulation and environmentally conscious decorating products.
Celtic Sustainables' materials are relevant to a range of building conservation and renovation activities, including:
Where historic or listed buildings are involved, material selection and proposed alterations should be informed by appropriate conservation expertise and any necessary statutory consents.
This independent directory listing has been prepared by ConserveConnect using publicly available information about Celtic Sustainables Ltd and its products.
Inclusion does not constitute an endorsement, recommendation or certification of the supplier, its products or their suitability for any particular building conservation or construction project.
Product specifications, technical approvals, certifications and installation requirements should be confirmed directly with the supplier. Appropriate professional advice should be obtained before undertaking works that may affect historic building fabric.
| Products, Materials & Specialisms | |
|---|---|
| Principal Products & Materials: | Natural insulation, sheep's-wool insulation, hemp insulation, wood-fibre insulation, recycled-fibre insulation, breathable building materials, lime mortars and plasters, insulating lime renders, clay paints, mineral paints, silicate paints, airtightness systems, sustainable retrofit |
| Capabilities and Specialisms: | Supply of natural and recycled insulation, breathable wall and floor materials, traditional lime products, specialist mineral and clay paints, wood treatments, airtightness membranes and tapes, sustainable building materials, product selection guidance, technical information, nationwide materials distribution |
| Contact & Online Presence | |
| Email: | info@celticsustainables.co.uk |
| Business Details & Assurance | |
| Company Trading Name: | Celtic Sustainables Limited |
| Company Number: | 04071622 |
