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Building Materials Companies in Swansea: 88 Active Firms (2026)
Building materials companies in Swansea manufacture, supply, and distribute construction products across South Wales projects.
Buying centres tend to sit with procurement teams, site managers, estimators, merchants, and regional developers rather than a single central buyer. Sales are usually practical and specification-led: repeat replenishment for trade counters, project-by-project supply for contractors, and framework-style relationships for public-sector construction buyers. The better-fit suppliers are those handling bulky, time-sensitive materials where stock availability, haulage, credit control, and technical compliance shape the sale as much as unit price.
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Swansea has 88 actively trading building materials firms in this list, with a reported headcount of 1,932 people. The cohort spans local specialist suppliers, processors, wholesalers, and distributors serving South Wales construction demand. Activity is likely to be tied closely to contractor pipelines, merchant networks, and regional development work, rather than purely national specification cycles. The presence of an upper tier by turnover suggests some suppliers have moved beyond small trade-counter operations into broader distribution or manufacturing roles.
Specification risk matters in this market because materials sit inside regulated construction projects, even where the supplier is not the main contractor. Product provenance, testing documentation, safe storage, and delivery traceability all affect whether a supplier can win repeat work with contractors and public-sector buyers. Market structure is also localised: bulky materials favour depots, yards, and reliable regional logistics, while higher-value fixtures and specialist products can travel further if technical support or availability justifies the cost.
Demand appears likely to favour suppliers that can combine dependable stockholding with technical advice and predictable delivery slots. Smaller operators may remain viable where they serve specialist trades or hard-to-source product niches, but scale advantages tend to sit with firms that can manage credit risk, yard capacity, and logistics across a wider catchment. Consolidation pressure may persist around distribution-heavy categories, while manufacturers and processors with local supply advantages should remain harder to replace.
88
Active firms
2026
10
Above £5M
reported revenue
23
Since 2022
incorporated firms
Key facts
About 11% of the trading cohort reports turnover above £5M (10 of 88 firms) — the rest sits below that revenue band.
26% of the cohort was incorporated since 2022 (23 firms), so a sizeable share is in its first few filing cycles.
Swansea building materials firms sit close to the South Wales construction supply chain, with demand linked to housebuilding, commercial fit-out and infrastructure work.
The local segment spans manufacturing, supply and distribution, so researchers should not treat it as a single production niche.
Buyer lists may need to distinguish regional materials suppliers from firms focused on repeat distribution into construction projects.
Top Swansea Building Materials companies
SWANSEA READYMIX CONCRETE LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable · 0% CAGR over 1y
Location
F.R.E.D.S. Timberframe Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and supplies timber frame building systems for residential and commercial construction. Produces modular homes, structural timber frames and stair components, and provides…
Serves UK-wide commercial builders, property developers and trades delivering housing developments, alongside homeowners planning one-off new builds or extensions; also works with housing…
Financial Health
StableStable · Hiring · 36% CAGR over 4y
Location
WEST COAST ROOFING SUPPLIES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies roofing materials and related building products, including tiles, slates, bitumen felt, EPDM and GRP systems, roof windows, insulation, timber batten, fixings, sealants, guttering, and tools…
Serves roofers, roofing contractors, builders and trade account customers, as well as local DIY or property customers, needing roofing materials, tools and accessories from a Swansea yard and…
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 4y
Location
Spectrum Glass Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies architectural and bespoke glass products for commercial and residential projects, including balustrades, insulated and toughened glass units, laminates, partitions,…
Serves architects, commercial developers, glazing and construction contractors, and homeowners needing bespoke project glass across South Wales, Bristol, Cornwall and the wider UK.
Financial Health
HealthyHealthy · Hiring · 4% CAGR over 4y
Location
CARREG DEVELOPMENTS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies aluminium and uPVC windows and doors, including bi-fold doors and curtain walling systems. Provides conservatory roofs and window and door repair services for domestic and…
Serves homeowners and commercial clients across the UK, with a local emphasis on Pontypool and surrounding areas including Bristol, Hereford, Monmouth and Gloucester.
Financial Health
StableStable · -68% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures roll‑formed coated steel roofing and cladding sheets made to measure for building projects. Supplies insulated panels, flashings, fasteners, coatings and related accessories used in the…
Serves contractors, building designers and project customers needing cladding and roofing materials for new-build and refurbishment projects.
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures polyurethane liquid waterproofing membranes, sealants, primers, topcoats and related building chemicals for the construction industry. Products are used in roofing, balconies, car parks,…
Sells B2B to construction industry buyers, including roofing and waterproofing contractors, distributors, and building professionals specifying systems for flat roofs, car parks, bridges,…
Financial Health
WeakWeak · -6% CAGR over 3y
Location
ASPECT ALUMINIUM LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs aluminium windows, doors, and architectural glazing systems for residential and building projects. Product range includes sliding, bi-fold and French doors, roof lights, curtain…
Serves homeowners, property owners, architects and builders working on new builds, renovations, extensions and commercial or industrial buildings across Swansea, Cardiff, South Wales, West Wales and…
Financial Health
StrongStrong · Hiring · 29% CAGR over 4y
Location
AWE ALUMINIUM LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies aluminium windows, doors and roof systems for trade customers. Product range includes casement, tilt and turn, and heritage windows, along with bi‑folding, sliding and…
Sells to trade and commercial buyers needing supply-only aluminium windows, doors and roofs, while also serving homeowners. Targets businesses and organisations in local areas and as far as Cornwall.
Financial Health
HealthyHealthy · -6% CAGR over 2y
Location
Altec Systems Ltd
Trajectory
5y · 2021–NowFinancial Health
Insufficient historyInsufficient history
Location
PREMIER CONCRETE PRODUCTS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · -92% CAGR over 2y
Location
Gower Concrete Ltd
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
HealthyHealthy · 0% CAGR over 3y
Location
LAKESIDE FLOOD SOLUTIONS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures, supplies and installs flood defence systems for residential, commercial and infrastructure properties, including demountable and automatic flood barriers, flood doors and…
Sells to homeowners, business owners and property stakeholders needing flood protection, including commercial and industrial premises, utilities and infrastructure. Serves architects, environmental…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
Door Fabrications Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and installs industrial and commercial doors, roller shutters, security grilles, steel door sets and PVC strip curtains. Also fabricates gates, railings, fencing, canopies, handrails and…
Serves commercial and industrial organisations, facilities teams and property owners in Swansea, plus domestic customers needing secure premises access, gates, railings or property security upgrades.
Financial Health
StableStable · -3% CAGR over 4y
Location
AKT ROLLER SHUTTERS LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
WeakWeak · 0% CAGR over 1y
Location
Eaton Fencing Specialists Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsSupplies and installs fencing, decking, gates and other garden structures for domestic and commercial customers. Also sells sheds, summer houses, garden furniture, aggregates, artificial grass and…
Serves domestic customers, families and local businesses around Swansea and South Wales, including homeowners improving gardens and commercial buyers needing fencing, gates and outdoor landscaping…
Financial Health
StableStable · Hiring · 4% CAGR over 3y
Location
DOOR SYSTEM INSTALLATIONS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns, manufactures and installs aluminium door systems for commercial buildings, including automatic sliding and swing doors, manual doors, and shopfronts. Also provides aluminium windows, curtain…
Serves businesses, councils, facilities management companies and retailers across the UK, including offices, shopfront operators and public-building managers needing commercial entrance systems.
Financial Health
HealthyHealthy · -6% CAGR over 4y
Location
GOWER ALUMINIUM LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable · 0% CAGR over 1y
Location
Apollo Scaffolding (Wales) Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsManufactures aluminium scaffolding components including ladder beams, lattice beams, X‑beams and box beams. Produces scaffold accessories such as ladder access gates, loading bay gates, stair treads…
Sells B2B to scaffolding contractors, construction firms and industrial project teams needing approved scaffold beams, access components and bespoke structures, with customers in the UK and overseas.
Financial Health
DistressedDistressed · -15% CAGR over 3y
Location
H S BASSETT & SON LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures and fabricates laminated interior fittings including worktops, toilet cubicles, vanity units, IPS panels, wall and shower panelling, bars and counters. Supplies sheet laminates and…
Serves trade and retail customers, including landlords, tradespeople, laboratories, rail operators, hospitality venues, beauty salons, healthcare settings and businesses fitting out washrooms,…
Financial Health
HealthyHealthy · -3% CAGR over 3y
Location
Autodor Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures, supplies and installs garage doors, including roller, up-and-over and sectional types. Provides made-to-measure security shutters and grills for residential, commercial and industrial…
Sells to homeowners and DIY buyers needing garage doors, plus commercial and industrial property owners requiring security shutters. Serves customers in Swansea, Llanelli, surrounding areas and…
Financial Health
StableStable · -2% CAGR over 4y
Location
RE-WORKED LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures recycled surface panels and materials for commercial interior applications. Products include panels made from recycled plastics, textiles such as denim, and mineral waste, used for…
Sells B2B to commercial interior specifiers and buyers, including architects, designers, fit-out teams and contractors serving hospitality, retail, exhibition, workplace and washroom projects.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 4y
Location
Pro-Tect Grp Enclosures Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures glass‑reinforced plastic (GRP) enclosures and structures, including cabinets, kiosks, gatehouses, bunded and security enclosures, roofs and canopies. Produces bespoke units with…
Serves B2B and public-sector buyers procuring bespoke GRP enclosures, including facilities, infrastructure and site-management teams needing cabinets, gatehouses, tollbooths, security or bunded units.
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies garage door products including insulated sectional and side‑hinged doors, front entrance doors, roller door components, and automation systems. Provides product ranges, design options,…
Serves UK homeowners and trade customers, including garage door installers, dealers and fitting businesses looking to supply and install door systems.
Financial Health
WeakWeak
Location
Punchline Group Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Arkay Timber Products Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed
Location
Wright & Phillips Carpentry & Building Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
APRO BUILDING LIMITED
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Project Carpentry Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
FIREL LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy · Profitable, Growing · 0% CAGR over 1y
Location
Celtic Ready Mix Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsSupplies ready-mix concrete to trade and public customers and provides concrete pumping services. Manufactures, supplies and installs liquid screed flooring and produces interlocking concrete blocks…
Serves trade customers and the general public needing concrete-related supplies across South West Wales, including builders, contractors, developers, self-builders and domestic customers.
Financial Health
StableStable · 0% CAGR over 3y
Location
Lliw Building Supplies Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsSupplies building and construction materials to trade and DIY customers, including bricks, blocks, cement, aggregates, timber, joinery, drainage products, paving, tools, workwear, fixings and…
Serves contractors, tradespeople, self-builders and DIY customers, with trade accounts and delivery for customers across Swansea and South Wales.
Financial Health
WeakWeak · -2% CAGR over 4y
Location
LBS BUILDERS MERCHANTS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies building materials and construction products including timber, aggregates, cement, insulation, roofing, plumbing and decorating supplies. Also sells tools, landscaping materials, kitchen and…
Serves trade and retail customers in South West Wales, including builders, contractors, developers, groundworks teams, roofers, landscapers, self-builders and DIY homeowners undertaking construction,…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
PENYGROES CONCRETE PRODUCTS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies dense and medium-dense concrete blocks, hollow blocks, insulation blocks and concrete bricks for building construction. Offers products for walls, floors and structural…
Serves trade construction professionals, builders and the general public needing concrete blocks across South and West Wales, including Swansea, Llanelli, Carmarthenshire, Pembrokeshire and Cardigan.
Financial Health
StableStable · -2% CAGR over 4y
Location
CELTIC CONCRETE PUMPING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies ready-mix concrete to trade and public customers and provides concrete pumping services. Manufactures, delivers and installs liquid screed, and produces interlocking concrete blocks for…
Serves trade customers, builders, construction contractors and public/domestic buyers across South West Wales, with some customers further afield for liquid screed projects.
Financial Health
StableStable
Location
Talbot Block Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies building and DIY materials through a builders’ merchant, including concrete blocks, bricks, timber, sheet materials, cement and aggregates. Also sells tools, plumbing and electrical…
Serves trade builders, contractors, DIY customers and gardeners needing building, landscaping and home improvement supplies, with daily delivery around Port Talbot, Neath and areas from Swansea to…
Financial Health
StableStable · 0% CAGR over 4y
Location
MERGE SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies timber frame building systems for residential construction. Produces timber frame houses and structural components and provides estimating and architectural support for…
Serves homeowners, self-builders and property developers seeking timber-frame house projects in South Wales, including Swansea, Haverfordwest, Bridgend, Cardiff and Newport.
Financial Health
WeakWeak · -5% CAGR over 2y
Location
DORIAN PHILLIPS & PARTNERS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsSupplies building and DIY materials including timber, insulation, plumbing, roofing, drainage, aggregates and decorating products. Also retails hand and power tools and provides kitchen and bathroom…
Serves local tradespeople, builders and the general public in Carmarthenshire and Pembrokeshire, including trade customers and DIY homeowners undertaking building, renovation, plumbing, kitchen and…
Financial Health
HealthyHealthy · -47% CAGR over 3y
Location
MELINGOED LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsManufactures timber roof trusses and metal‑web Posi‑Joists for building projects. Supplies tailored roof and floor packages and sells graded structural timber, plywood and other building materials,…
Serves builders, architects, engineers, local contractors, home builders and homeowners across Wales, primarily within the construction industry.
Financial Health
WeakWeak · -6% CAGR over 2y
Location
SO MODULAR LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures modular timber frame building systems for the construction sector. Produces timber frame structures, roofs and floor systems, and provides design, manufacturing, delivery,…
Serves self-build homeowners, national housebuilders, contractors and developers across residential, care, education and commercial construction, from single homes to multi-dwelling schemes across…
Financial Health
StableStable · 3% CAGR over 2y
Location
TOWY WORKS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates a builders’ merchant retail business supplying ironmongery, building materials, and construction supplies to trade and retail customers, and provides trade credit accounts and purchasing…
Serves trade customers and consumers in the Carmarthen and Ammanford communities, including builders, contractors, DIY customers and local project owners needing ironmongery and building supplies.
Financial Health
HealthyHealthy · -88% CAGR over 2y
Location
European Plastics Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures plastic roofing and building products including dry verge systems, eaves trays, ventilation components, dry ridge and hip systems, GRP valleys, breather membranes, slate hooks, fixings,…
Serves UK roofing trade customers, including roofing contractors, builders’ merchants and construction firms needing dry-fix roofing products and accessories delivered to yards or sites.
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
NOLAN UPVC (HOLDINGS) LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures and installs uPVC and aluminium double‑glazed windows and doors, including casement, sash, bifold and patio systems. Also supplies conservatories, orangeries, roof lanterns, and roofline…
Targets residential homeowners and trade partners in the home improvement and building sector across Carmarthen, Cardiff, Swansea, Llanelli, Bridgend, Pembroke, wider Wales and South England.
Financial Health
HealthyHealthy
Location
CREO MANUFACTURING LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Jones Jones & James Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProcesses and manufactures timber products including sawn timber, engineered wood I‑joists, pallets and packaging. Activities include timber harvesting, sawmilling, pallet manufacture and repair, and…
Serves B2B customers in UK construction, housebuilding, landscaping and agriculture, plus domestic and exporting businesses needing pallets and packaging.
Financial Health
HealthyHealthy
Location
Derwen Aggregates Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsOperates a waste recycling and recovery facility providing waste collection, skip hire and disposal services. Processes inert waste into recycled aggregates and supplies muckaway and haulage services…
Serves construction, civil engineering and utility firms in South West Wales, alongside local domestic and trade customers needing skips or waste disposal.
Financial Health
WeakWeak · -1% CAGR over 2y
Location
TEMPERTECH (WALES) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures uPVC windows and doors, sealed double and triple glazed units, and glass products. Produces conservatories, rooflights, bi-folding doors and vertical sliding window systems for the…
Serves trade customers and homeowners needing glazing, window and door products across Wales, the South West, West Midlands and Southern Counties.
Financial Health
StableStable · -5% CAGR over 4y
Location
TEIFI TIMBER PRODUCTS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsOperates a sawmill processing more than 30,000 FSC‑certified logs annually. Produces sawn timber and related wood products, supplying construction timber used in agricultural and industrial building…
Serves trade and business customers in timber and construction-related sectors, including sawmills and manufacturers needing home-grown construction timber for agricultural and industrial buildings.
Financial Health
StableStable · -1% CAGR over 5y
Location
Shufflebottom Partners LLP
Trajectory
1y · 2025–NowDesigns and manufactures steel‑framed buildings and structural steelwork for agricultural, equestrian, industrial and commercial construction projects. Supplies building kits or provides erection…
Serves agricultural and equestrian businesses, industrial and commercial property operators, and main contractors delivering construction projects such as factories, offices, schools, sports centres,…
Financial Health
Insufficient historyInsufficient history
Location
Lignum Joinery Services Ltd
Trajectory
5y · 2018–NowFinancial sub-scores
Computed from 5 filingsManufactures bespoke joinery products including CAD-designed, CNC‑machined timber windows, doors, fire doors and staircases. Works with design teams and installers to produce custom wood components…
Targets trade customers and private clients in South Wales, including installers, building professionals and homeowners involved in residential or commercial projects that require custom joinery…
Financial Health
DistressedDistressed
Location
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How Swansea Building Materials companies work and how to sell to them
What they do
Building materials firms in Swansea typically earn revenue by manufacturing, processing, wholesaling, or distributing physical materials used on residential, commercial, and infrastructure projects. Sales mix between repeat account trade, bulk supply into live sites, and one-off orders where availability is the deciding factor. Pricing is usually per tonne, sheet, pallet, load, or item, with discounts tied to volume, account status, delivery distance, and supplier rebates. The service component matters: buyers often need product advice, proof of compliance, timed delivery, credit terms, returns handling, and substitutes when specified materials are unavailable.
Who they sell to
Most customers are contractors, merchants, developers, specialist trades, and public-sector construction buyers across Swansea and the wider South Wales metropolitan area. Day-to-day influence often sits with procurement teams, site managers, estimators, and trade-counter staff, while larger packages may involve commercial managers and finance teams approving credit exposure. Smaller orders can be won through direct relationships and repeat account behaviour; larger project supply tends to move through quotes, schedules, tenders, and framework-style procurement. Sales cycles are usually short for replenishment stock, but longer where specification, delivery planning, and payment terms need to be agreed before site work starts.
What they buy
Most building materials firms tend to spend on systems and services that keep stock, vehicles, yards, and cash moving. Common needs include inventory and warehouse software, order management, transport planning, route scheduling, credit control, trade-account CRM, e-commerce for repeat customers, pricing tools, accounting, payroll, HR, and health and safety support. Manufacturers and processors may also buy production planning, quality documentation, maintenance services, testing support, waste management, and energy advice. Distribution-heavy firms are often receptive to fleet services, fuel management, depot equipment, yard security, product information management, and cyber security where customer portals or card payments are involved.
Why and how to sell to them
Building materials buyers tend to evaluate vendors when stock errors, late deliveries, margin leakage, or credit exposure start affecting customer retention. Other triggers include a new depot or yard, expansion into public-sector work, a move past £5M revenue, a change in operations leadership, or pressure to produce cleaner compliance documentation for contractors. Outbound messages land better when they attach to practical outcomes: fewer failed deliveries, faster quote-to-order conversion, tighter account controls, clearer proof of product provenance, or better visibility of yard capacity. Generic productivity claims are less persuasive than a direct link to haulage, stockholding, and site deadlines.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
Also in Swansea
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Frequently asked questions
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