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Joinery Companies in Glasgow: 400+ Active Firms (2026)
Joinery companies in Glasgow manufacture and install timber doors, windows, stairs, fitted interiors and site carpentry for construction projects.
Buying centres tend to be construction-led rather than facilities-led: main contractors, housebuilders, commercial fit-out teams, public-sector estates teams and property managers buy defined packages around manufacture, supply, installation and remedial works. Residential customers still matter, but the more researchable Glasgow firms usually sit in B2B or public-sector supply chains, with repeat subcontracting relationships and project-by-project pricing. Engagements range from small works on refurbishment programmes to packaged stair, fire-door, interior fit-out and site-carpentry scopes where drawings, tolerances, accreditations and handover evidence matter as much as workshop capacity.
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Glasgow has 454 actively trading joinery companies in scope, a local base that is broad by trade-services standards but still weighted towards smaller operators. Reported headcount totals 1,530 people across firms with employment disclosure, giving researchers a visible labour footprint rather than only a register of legal entities. Scale is uneven, with only a narrow turnover-scale layer above local subcontracting. That mix points to a market made up largely of trade contractors and workshop-based suppliers serving construction, refurbishment and property-maintenance demand across the city and surrounding area.
No dedicated sector licence governs Glasgow joinery contractors; oversight comes through building control, product standards and site safety practices. Competent person schemes, as described by GOV.UK, let eligible installers self-certify certain building work instead of seeking separate building regulations approval, with voluntary membership and ongoing assessment. The British Woodworking Federation sits closer to the product and manufacturing side, providing regulatory information and operating schemes around fire doors and stairs. For buyers, the practical issue is often evidence: specification, test documentation, installer competence and records that survive handover.
Glasgow’s joinery market appears likely to remain tied to the cadence of construction, refurbishment and public-estate maintenance rather than to a separate technology or consumer cycle. Newer entrants tend to compete on responsiveness and subcontract availability, while scaled operators are more exposed to specification discipline, compliance evidence and contractor procurement pressure. Fire-door, stair and fitted-interior work should keep safety-led documentation in view. Consolidation may come through succession, workshop capacity and framework access, although many operators appear better suited to local repeat work than to acquisitive regional expansion.
454
Active firms
2026
8
Above £5M
turnover
127
New incorporations
since 2022
Key facts
About 1% of the trading cohort reports turnover above £5M (8 of 454 firms) — the rest sits below that revenue band.
27% of the cohort was incorporated since 2022 (127 firms), so a sizeable share is in its first few filing cycles.
Joinery and carpentry work sits within the building-control framework rather than a single sector licence; GOV.UK competent person schemes let approved installers self-certify certain building work, with approved work subject to ongoing inspections.
The British Woodworking Federation has 500+ members and operates industry schemes covering fire doors and stairs, reflecting the role of product safety, specification and installation standards.
ONS construction statistics for Great Britain put new work at £140.7 billion in 2024, up 1.4%, while new orders reached £71.7 billion, up 5.6%.
ONS recorded 370,770 VAT/PAYE-registered construction firms in Great Britain in Q3 2024, up 1.7% year on year.
Asia-Pacific accounted for 47.10% of 2025 market share in builders’ joinery and carpentry of wood, while door and window frames accounted for 38.45% of 2025 revenue.
Top Glasgow joinery companies
Tri-Square Construction Solutions Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial joinery and interior fit-out services, including installation of partitions, ceilings, fire-rated doors and screens, fire door inspection and maintenance, and SFS/METSEC framing…
Sells to main contractors, developers and commercial property clients on construction projects, including offices, hotels, education sites, housing blocks, distilleries and public-sector facilities.
Financial Health
HealthyHealthy · Hiring · 34% CAGR over 3y
Location
J.W.MURRAY INTERIORS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides interior fit-out, refurbishment and building services for commercial, public sector and domestic projects. Also undertakes fire protection works and manufacturing related to interior…
Sells to direct clients and main contractors across the UK, including public sector buyers such as health boards, schools and MOD, plus airports, hotels, offices, bars, restaurants and domestic…
Financial Health
DistressedDistressed · -78% CAGR over 3y
Location
MCW SCOTLAND LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides building and construction services including new build and refurbishment projects. Manufactures bespoke joinery such as windows, doors and staircases, and delivers property maintenance work…
Serves public-sector bodies, local authorities, corporate clients, architectural and quantity surveying practices, and domestic customers across the west coast of Scotland.
Financial Health
WeakWeak · -15% CAGR over 2y
Location
Sj Joiners Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides joinery contracting services for commercial and residential construction projects. Delivers interior fit-outs, structural and finishing joinery, and project support from initial build stages…
Serves UK commercial construction and retail fit-out clients, government and public-sector projects, and residential homeowners with projects of varying size.
Financial Health
StrongStrong · Hiring · 41% CAGR over 2y
Location
BSL Interiors Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides shopfitting and commercial interior fit-out services, including office refurbishment, partitioning, suspended ceilings, bespoke joinery, glass partitions, and electrical and plumbing…
Serves small independent retailers, commercial and industrial businesses, hospitality operators, and private and public sector healthcare and education clients across the UK.
Financial Health
HealthyHealthy · -8% CAGR over 3y
Location
J.B.BARBOUR & CO LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides shopfitting and interior fit‑out services for retail, commercial and leisure spaces. Offers design, project management, refurbishment and installation, supported by in‑house bespoke joinery…
Sells to businesses and organisations needing fit-out and shopfitting, especially retail, leisure, corporate and commercial brands, plus museums and visitor centres, across Scotland and the wider UK.
Financial Health
WeakWeak · -17% CAGR over 2y
Location
Bridgewater Building Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction and refurbishment services including commercial fit-outs, structural alterations, strip-outs and building fabric maintenance. Also produces bespoke joinery and carpentry through…
Serves business and property clients, including offices, developers, hospitality/leisure venues, and organisations commissioning refurbishments, fit-outs, structural alterations, exhibitions, or…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
WALKER CONTRACTS LTD.
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides construction and building services including joinery, installation of internal door sets and ironmongery, and dry lining. Undertakes work on new build housing and other projects, operating…
Serves main contractors, large construction contractors and blue-chip companies on construction and new-build housing projects, alongside local building clients in Glasgow and surrounding areas.
Financial Health
StableStable · 0% CAGR over 2y
Location
M & G JOINERY LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and installs bespoke timber joinery including windows, doors, staircases, conservatories, porches and fitted furniture. Produces made‑to‑measure components such as panels and mouldings…
Serves homeowners, property owners, architects and builders needing bespoke timber joinery for renovation, conservation and modern building projects, including awkward spaces and traditional features.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Legacy (Home Improvements) Limited
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs custom-built kitchens, bedrooms, bathrooms and study furniture. Produces cabinets and doors in-house and offers bespoke storage solutions, sliding door systems and…
Serves a mix of homeowners, social housing providers, and health or dental clinics needing bespoke fitted furniture for kitchens, bedrooms, studies and specialist spaces.
Financial Health
WeakWeak · Hiring · 6% CAGR over 5y
Location
Fourply Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides building refurbishment, minor works, fire protection installation, and maintenance services for commercial and public sector properties. Employs in‑house trades including carpentry,…
Serves business and public-sector property teams across the UK, including retail, healthcare, hospitality, transport, commercial, education and local government organisations.
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 2y
Location
DAW SIGNS AND FIT-OUTS LIMITED (FORMERLY DAW SIGNS LIMITED)
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs internal and external signage and commercial fit-outs. Provides marketing suite installations, retail hoarding, wayfinding systems, and bespoke joinery and…
Serves UK businesses and property developers needing branded spaces, including marketing suites, high-street retail outlets, offices, bars, communal areas and large multi-site projects.
Financial Health
StableStable · -2% CAGR over 4y
Location
Deckbuilders UK Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs timber, composite and aluminium decking for residential and commercial projects. Also constructs timber structures including balconies, boardwalks, bridges, walkways, jetties and…
Serves UK homeowners and commercial/public-sector clients, including house builders, developers, architects, local councils, schools, hospitality venues and community/sports facilities.
Financial Health
WeakWeak · Hiring · 19% CAGR over 4y
Location
Mybeautifulkitchen Ltd
Trajectory
5y · 2018–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies and installs bespoke fitted kitchens, offering interior design, planning and project-managed installation. Provides custom kitchen layouts, cabinetry and kitchen packages, with…
Serves homeowners and domestic renovators in Glasgow, Edinburgh, Ayr, Stirling and nearby areas, particularly consumers planning fitted kitchen or bathroom projects and seeking showroom-based design…
Financial Health
StrongStrong · 0% CAGR over 5y
Location
J D McLeish Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides property maintenance and refurbishment services for residential and commercial properties, including painting and decorating, joinery, plumbing and gas work, bathroom installation, insurance…
Serves homeowners, landlords, letting agencies, estate agents, hotels, care homes and other businesses across Glasgow with homes, investment properties or business premises.
Financial Health
StrongStrong · Hiring · 82% CAGR over 4y
Location
Wood Construction 16 Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides contract construction services for building projects, supplying multi-trade labour and on-site supervision. Offers site foreman or site manager roles and supports projects with health and…
Serves B2B construction clients, main contractors and site operators needing contract construction teams, trades and site management support.
Financial Health
DistressedDistressed · Hiring · 13% CAGR over 1y
Location
DKL Joinery Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
GW Joinery & Glazing Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · Hiring · 19% CAGR over 4y
Location
TMS Kits Direct Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns, supplies and installs bespoke kitchens, bedrooms and bathroom interiors for residential projects. Provides custom design services, cabinetry and fitted furniture, managing projects from…
Serves homeowners across Scotland, particularly Glasgow and Ayrshire, seeking bespoke kitchen, bedroom, bathroom and interior projects, with a separate route for business and contract enquiries.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Noble Carpentry & Maintenance Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
OUTSIDE IN GARDEN ROOMS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs bespoke insulated garden rooms and modular glamping cabins for residential and commercial use. Provides foundations, construction, glazing, electrical installation…
Serves homeowners in Glasgow, Edinburgh and Central Scotland seeking extra domestic space, plus hospitality and other businesses in Scotland looking to add guest or staff accommodation.
Financial Health
HealthyHealthy · 2% CAGR over 4y
Location
PHOENIX JOINERY SCOTLAND LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
WeakWeak · 0% CAGR over 1y
Location
Impact Joinery Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs bespoke joinery and fitted furniture, including painted wardrobes, sliding-door closets, kitchens and custom staircases. Provides made-to-measure cabinetry and…
Targets private homeowners renovating or furnishing residential properties, particularly those seeking custom fitted wardrobes, bedroom suites, kitchens, staircases and storage solutions rather than…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
LOH JOINERY LTD
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing, Hiring · 15% CAGR over 5y
Location
Glasgow Kitchen & Bathrooms Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies and installs fitted kitchens and bathrooms for residential properties. Offers showroom consultation, home surveys, layout design, cabinetry, worktops, appliances, sanitaryware and…
Serves homeowners and families in Glasgow and West/Central Scotland seeking fitted kitchen and bathroom projects, including home renovations for modern, traditional, small-space, en suite and wet…
Financial Health
WeakWeak · 0% CAGR over 5y
Location
A & K Builders & Joiners Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
S & G Joiners Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
XCEL JOINERY CONTRACTS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -68% CAGR over 4y
Location
C B Rigging Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
A.A.D Joinery Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable · 0% CAGR over 1y
Location
Jc Joinery (Scotland) Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Gr8 Living Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsDesigns and supplies bespoke kitchens, offering German and British kitchen ranges, cabinetry, worktops and appliances. Provides kitchen design consultation, space planning and installation…
Serves homeowners and private residential clients around Glasgow seeking bespoke luxury kitchens, fitted furniture, wardrobes and home storage for residential renovation or improvement projects.
Financial Health
StableStable · 0% CAGR over 1y
Location
I STYLE (GLASGOW) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs bespoke kitchens, bathrooms and bedroom interiors for residential properties, providing space planning, cabinetry, fixtures and renovation services to remodel and fit out home…
Sells to homeowners and households in Scotland seeking bespoke kitchen, bathroom and bedroom projects, from single-room upgrades to larger home improvement renovations.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Mack'S Contracts Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
STEPHEN BOYD JOINERS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -5% CAGR over 4y
Location
BERRY JOINERS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
WeakWeak · -90% CAGR over 2y
Location
Timbercraft Builders Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
PRIME JOINERY SOLUTIONS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides joinery contracting services including installation and maintenance of fire door sets, internal timber doors, front entrance door sets and emergency doors. Works on new-build and occupied…
Serves construction firms and main contractors, plus domestic clients, primarily in Central Scotland. Customers include new-build and occupied-building projects across education, healthcare,…
Financial Health
StrongStrong · Growing · 3% CAGR over 3y
Location
ALLSTAR JOINERY LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial joinery and shopfitting services, including design, manufacture and installation of bespoke furniture, partitions, ceilings and interior fittings. Delivers full fit-out and…
Serves B2B and public-sector clients, including architects, interior designers, construction professionals and business owners in education, healthcare, retail, banking, hotels, restaurants, offices…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 3y
Location
OMNI INTERIOR SOLUTIONS LIMITED
Trajectory
4y · 2020–NowFinancial sub-scores
Computed from 4 filingsProvides installation, inspection and maintenance of fire doors and delivers commercial interior fit-out services including joinery and drylining for construction and refurbishment projects in…
Serves B2B clients in commercial property and construction, including organisations requiring fire door safety, fit-out, joinery and drylining support.
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
Clydeview Joinery Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides fire door surveys, maintenance and installation services, including certified inspections and compliance work. Also delivers commercial joinery and general building projects for residential,…
Serves contractors, commercial property owners, public buildings and homeowners needing compliant fire-door and joinery support across Glasgow, Renfrewshire and surrounding areas.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
Custombuilt Joinery Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and installs bespoke timber and uPVC windows and doors, including sash windows, storm doors and secondary double glazing. Provides joinery services such as timber door manufacture,…
Serves homeowners and commercial property clients across Glasgow and west, central and north Scotland, including domestic and business buyers with projects or contracts of varying sizes.
Financial Health
DistressedDistressed · -4% CAGR over 4y
Location
LINEAR UK GROUP LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides joinery contracting and shopfitting services, delivering interior fit‑out and design-and-build construction projects. Also offers building compliance and fire safety services, and undertakes…
Serves developers, main contractors, property owners and occupiers across UK construction projects, including commercial interiors, design-and-build schemes, compliance works, fire-safety programmes…
Financial Health
StrongStrong
Location
Thomas Johnstone Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides construction and interior fit-out services, including building works, manufactured joinery, decorating, and small works projects. Delivers refurbishment and interior construction for hotels,…
Serves B2B clients across the UK in hospitality, leisure, retail, commercial offices, golf clubs, serviced apartments and education, including organisations commissioning high-end fit-out and…
Financial Health
StrongStrong · Profitable, Growing · 4% CAGR over 2y
Location
SWB PROJECTS (SCOTLAND) LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides shopfitting, building, and bespoke joinery services for retail, commercial, and domestic projects. Manages interior fit-outs including planning, procurement, structural alterations, and…
Serves retailers, commercial property developers, office and hospitality operators, and private clients across Glasgow and the UK.
Financial Health
StrongStrong
Location
JOHNSTON JOINERS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides subcontracted joinery and interior construction services for building and fit‑out projects, including structural framing systems (SFS), partitions, drylining, suspended ceilings, and bespoke…
Serves major construction and fit-out companies in Scotland as a subcontractor on commercial, retail, residential and public-sector building projects, typically for larger contractors managing…
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
MGN Fire Protection Services Ltd
Trajectory
1y · 2025–NowDesigns, supplies, installs and maintains passive fire protection systems for buildings, including fire doors, fire stopping, partitions and compartmentation. Provides inspection, maintenance and…
Serves commercial building owners, SMEs, construction teams on new builds, and public sector bodies such as schools, hospitals and government facilities across Scotland and the North of England.
Financial Health
Insufficient historyInsufficient history
Location
INSTYLE ALL TRADES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides construction, refurbishment and property maintenance services for residential, commercial and industrial projects. Offers multi‑trade work including passive fire protection, fire door…
Serves homeowners, commercial and industrial property clients, and public or institutional organisations needing construction, refurbishment, maintenance and multi-trade support across the UK and UAE.
Financial Health
HealthyHealthy · Hiring · 17% CAGR over 2y
Location
Wallace Topco Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides construction and refurbishment services, specialist interior fit-out, passive fire protection installation, and facilities management for commercial and public sector buildings, delivering…
Financial Health
HealthyHealthy · -6% CAGR over 2y
Location
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How Glasgow joinery companies work and how to sell to them
What they do
Glasgow joinery companies usually earn revenue through project-based manufacture, supply and installation rather than recurring subscriptions. Work is priced from drawings, bills of quantities, measured surveys or call-off schedules, with margins made on workshop labour, site labour, materials, site supervision and variations. Smaller jobs may be handled as dayworks or fixed-price minor works, while contractor-led packages tend to involve staged payments, retention and handover documents. The offer is a mixture of physical timber products and skilled labour: doors, stairs, fitted interiors, shopfitting, first and second-fix carpentry, remedial work and maintenance.
Who they sell to
Most sell to construction and property buyers rather than to a broad consumer market. Typical contacts include quantity surveyors, contracts managers, site managers, project managers, estates teams, architects, specifiers and procurement staff. Contract values vary widely, from minor repair orders to packaged fit-out, stair, door or site-carpentry scopes. Owner-managed firms often win work through repeat relationships and invited quotes, while larger operators are more likely to appear on subcontractor panels, public-sector frameworks or formal tender lists. Sales cycles are short for urgent repairs and small refurbishments, but stretch when drawings, certification, access and trade coordination need review before award.
What they buy
Most Glasgow joinery firms tend to spend on tools that reduce estimating, coordination and evidence burdens. Relevant software categories include estimating and job-costing, accounting, payroll, document control, drawing management, workforce scheduling, timesheets, health and safety, CRM and bid tracking. Workshop-led manufacturers may also buy stock control, purchasing systems, CNC support, asset maintenance and quality records; site-heavy contractors more often need mobile job sheets, snagging workflows, vehicle tracking, insurance support, training and recruitment services. Materials, fixings, ironmongery, fire-rated components, access equipment and waste services remain recurring operational purchases, usually bought through trade accounts rather than long procurement exercises.
Why and how to sell to them
Joinery buyers tend to evaluate suppliers when their workload becomes harder to price, evidence or staff. Common triggers include a move from domestic work into contractor packages, entry onto a framework, a run of fire-door or stair work, a new workshop, additional vans, senior estimator recruitment, or a requirement from a main contractor for better site records. Pain points are practical: retentions and late payment, material price movement, skilled labour shortages, drawing revisions, defects liability and handover paperwork. Outbound angles usually land better when they connect to margin control, faster tender response, fewer site revisits or clearer proof of compliance.
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.
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