Companies Using One.com in London: 129 Active Firms (2026)
London companies running hosted website infrastructure maintain public sites using externally managed domains, email and web hosting.
Adoption tends to sit with owner-managed and departmental websites rather than infrastructure-heavy technology teams. The buying centre is usually a founder, practice manager, marketing lead or operations manager, with external agencies handling design and updates where the site supports enquiries, bookings or product catalogues. Companies running this hosted stack usually want predictable domain, mailbox and site uptime without hiring web-operations staff. The signal is less about enterprise IT maturity than about a business with a public acquisition channel, a maintained site, and enough commercial activity to justify paid web services.
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London has 129 actively trading companies running this hosted stack, making it a compact adoption cohort rather than a broad enterprise-software population. Reported employment totals 3,322 people, so usage is not confined to dormant brochure sites or very small incorporations. The mix leans towards healthcare providers, education and training organisations, recruitment and staffing firms, physical security services, and wholesale or distribution operators. That sector pattern fits a practical website requirement: public credibility, enquiries, appointment or candidate flows, and enough back-office need for managed email and domain administration.
Website hosting procurement sits outside sector-specific regulation for most adopters, but privacy and security controls still matter. Contact forms, enquiry mailboxes, analytics tags and anti-spam checks can move personal information through external systems, so UK GDPR obligations and ICO expectations on transparency, retention and processor oversight apply. The vendor model is typically bundled: domain management, hosted mail, web space and site-builder or content-management tooling sit behind a single commercial relationship, often administered by an agency rather than an IT department. That keeps purchasing simple, but it can leave ownership, backups and access controls under-specified.
Adoption appears likely to persist among organisations that need a maintained web presence but do not want a separate infrastructure function. Bundled hosting and content-management services tend to suit firms where marketing, operations and administration overlap, especially when the website is a channel for forms, appointments, recruitment or product information. Migration pressure may come from security expectations, mailbox reliability and the growing tendency for website, analytics and customer-enquiry tools to be bought together. Some firms will outgrow this stack, but many appear to value low administrative burden over platform flexibility.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Adoption by company size
Adoption of One.com rises with company size across the trading companies in this cohort. 0% of the 532,485 companies with under 10 employees run One.com (81 detected). 0.2% of the 15,364 companies with 10–50 employees run One.com (33 detected). 0.7% of the 1,763 companies with over 50 employees run One.com (12 detected). That is a 0.7% gap between the over 50 employees and under 10 employees bands.
129
Active firms
2026
2
Above £5M turnover
Trading firms
7
Median headcount
Filed accounts
200
Verified directors
Across this cohort
Top companies using One.com in London
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 5 filingsProvides commercial cleaning services for offices and facilities including schools, universities, medical sites, gyms and hospitality venues. Also supplies window, carpet and floor cleaning, waste…
Serves businesses and institutions in London and Kent, including offices of all sizes, universities, schools, nurseries, student accommodation providers, clinics and hospitals, gyms, hotels, pubs,…
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides home care services for elderly and disabled people, including domiciliary visits, live‑in care, personal care, respite care, medication support, companionship, and assistance with daily…
Serves elderly and disabled people, adults needing post-illness or post-surgery support, and their families seeking homecare, respite care, personal care, and supported living in Ealing, Hounslow,…
Financial Health
HealthyHealthy · Hiring · 103% CAGR over 4y
Location
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Computed from 4 filingsProvides domiciliary home care services for adults, including companionship, personal care, meal preparation and housekeeping, as well as specialist support such as dementia care, live‑in care,…
Serves individuals and families in West London, especially older adults and people with dementia, Parkinson’s, post-operative, palliative or physical disability care needs who want support at home.
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides skip hire services for domestic and commercial customers, supplying waste skips for house clearances, office cleanouts and construction projects, with delivery and collection of hired skips…
Serves domestic households, offices, commercial customers and building site managers across Central, West, North West and North London, plus parts of Middlesex, Berkshire and Buckinghamshire.
Financial Health
StableStable · Hiring · 32% CAGR over 4y
Location
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Computed from 5 filingsProvides construction and property development services for residential and commercial projects, including house extensions, loft conversions, general building works and project management. Also…
Serves homeowners, flat owners, property developers and commercial clients across London, including businesses needing office, retail, warehousing or industrial premises.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 3 filingsProvides legal services to individuals, businesses and charities, including litigation and dispute resolution, family law, wills and probate, property conveyancing, employment law, immigration…
Serves individuals, businesses and charities, mainly across London. Acts for homeowners, landlords and tenants, families, employers and employees, and people needing wills, probate, immigration or…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
Location
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Computed from 4 filingsProvides electrical installation, maintenance and repair services for domestic, commercial and industrial properties. Conducts testing and safety inspections, issues electrical certificates, and…
Serves homeowners, landlords, commercial property operators and industrial sites needing electricians across London, Hertfordshire and Bedfordshire.
Financial Health
StableStable · 0% CAGR over 3y
Location
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Computed from 5 filingsProvides construction and property services for social housing and public sector landlords, including Decent Homes refurbishment works, DDA accessibility adaptations, property maintenance and void…
Serves social housing landlords and public sector organisations in London and Essex, including clients needing property maintenance, adaptations, refurbishments, new builds and extensions.
Financial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 4 filingsProvides property management and investment services, including buying, selling, renovating, maintaining and managing properties. Also advises landlords and tenants on lease renewals, rent review…
Serves property owners, landlords, tenants and property investors in the London property market, including owners seeking management or sale support and parties involved in lease renewal, rent review…
Financial Health
StrongStrong · Hiring · 26% CAGR over 3y
Location
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Computed from 3 filingsProvides residential property and estate management services for freeholders and resident management companies. Handles service charge administration, maintenance coordination, contractor management,…
Serves freeholders and resident management companies managing residential blocks and estates in London and the Home Counties, with related support for owners, residents and contractors.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
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Computed from 5 filingsProvides private security services including static manned guarding, event security, front‑of‑house security staff and door supervision. Supplies trained guards for offices, venues and construction…
Serves businesses, event organisers, venues, construction sites and homeowners in Barking and East London needing private security support, including offices, front-of-house environments and licensed…
Financial Health
StrongStrong · Growing, Hiring · 116% CAGR over 4y
Location
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Computed from 5 filingsProvides recruitment services for the hospitality sector, sourcing and placing staff in catering, housekeeping, and kitchen roles for hotels, restaurants, and catering businesses, using tailored…
Serves high-end hotels, restaurants and caterers in the London area that need hospitality staff, particularly catering, housekeeping and kitchen teams; also engages hospitality candidates seeking…
Financial Health
HealthyHealthy · -18% CAGR over 4y
Location
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Computed from 5 filingsOperates a day nursery and preschool providing childcare and early years education for children from infancy to age five. Delivers supervised play, learning activities and developmental programmes…
Serves parents and guardians in East London seeking childcare and early years education for children under 5, including pre-toddlers, toddlers and preschoolers.
Financial Health
StrongStrong · Growing, Hiring · 73% CAGR over 4y
Location
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Computed from 5 filingsProvides education recruitment services, supplying schools with qualified teachers and support staff. Screens and vets candidates, manages placements, and connects UK and overseas educators with…
Serves London schools and education hiring managers across nursery, primary, secondary and SEND, alongside UK-based and overseas teachers seeking placements in and around London.
Financial Health
StrongStrong · Hiring · 15% CAGR over 4y
Location
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Computed from 5 filingsProvides residential construction, renovation and property maintenance services. Carries out responsive repairs, planned and cyclical maintenance, house extensions, void works and disability…
Serves housing associations and residential property managers responsible for social housing and residential portfolios, with emphasis on clients across London and nationwide maintenance programmes.
Financial Health
StrongStrong · Growing, Hiring · 50% CAGR over 4y
Location
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Computed from 5 filingsProvides commercial relocation and workplace change services, including office moves, furniture delivery and installation, IT and server relocation, project and move management, storage, recycling,…
Serves businesses, office occupiers, public corporations and workplace-change specialists needing commercial relocation and furniture installation support, from small offices to multinational…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides accountancy services including bookkeeping, payroll processing, VAT return preparation, and self‑assessment tax filing. Advises on tax planning and business start‑ups, and supports clients…
Serves individuals, startups and small businesses in North London, including taxpayers, employers and VAT-registered businesses.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
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Computed from 2 filingsProvides residential property management services for landlords, including property inspections, maintenance coordination and repairs, tenant communication, rent collection, financial record keeping,…
Serves London property owners and private landlords, including HMO landlords, who need outsourced support for rental homes, communal areas and tenant-related obligations.
Financial Health
StableStable · Profitable · 0% CAGR over 1y
Location
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Financial sub-scores
Computed from 4 filingsProvides advisory services to institutional investors and asset managers, including operational and investment due diligence, governance and strategy consulting, custodian and fund administrator…
Serves institutional investment organisations globally, including asset allocators, investment managers, custodians, fund administrators and related third-party financial services providers.
Financial Health
HealthyHealthy · Hiring · 23% CAGR over 2y
Location
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Computed from 5 filingsProvides security services including static security officers, mobile patrols, alarm and emergency response, door supervision, close protection, concierge security, and security teams for residential…
Serves a mix of B2C and B2B customers, including homeowners, residential clients, businesses, event organisers and diplomatic clients needing security cover, patrols, response services and concierge…
Financial Health
StableStable · -70% CAGR over 4y
Location
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Provides domiciliary care services for individuals requiring support at home, including personal care, live-in care, assisted living support, terminal care and specialised care, with trained carers…
Serves individuals and families seeking domiciliary care, including post-acute, long-term, live-in, personal, terminal and specialist support, mainly across Greater London, Surrey, Richmond and…
Financial Health
N/AN/A
Location
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Computed from 5 filingsProvides design and build services for structural framing in residential and commercial construction projects, including reinforced concrete, steel, and light gauge steel frames. Delivers structural…
Serves residential and commercial property developers, main contractors and construction clients involved in building development projects, particularly in South London and Surrey.
Financial Health
HealthyHealthy · 10% CAGR over 3y
Location
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Computed from 3 filingsProvides childcare and early years education through a day nursery offering baby, toddler and pre‑school rooms for children aged around 3 months to 5 years, with play‑based learning activities, a…
Serves parents and families in Croydon seeking day nursery childcare and early years education for babies, toddlers and pre-school children aged 3 months to 5 years.
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
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Computed from 3 filingsProvides drying and restoration services for water‑damaged buildings, including flood response, construction drying and moisture investigations. Conducts mould remediation, mould and air‑quality…
Serves a mix of B2B and B2C customers, including homeowners, landlords, property managers, construction firms, facilities managers, insurers and loss adjusters dealing with water damage, mould or…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
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Operates an online shop selling organic and grocery products including bakery items, drinks, cereals, grains, sauces, snacks and cooking ingredients, alongside household cleaning products, paper…
Serves UK limited companies and sole traders, including independent retailers and other trade buyers purchasing organic groceries, drinks, household essentials and pet products.
Financial Health
N/AN/A
Location
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Computed from 5 filingsProvides household and office removal services including packing, transportation and storage. Also carries out property clearance for homes, gardens and offices, and conducts probate valuations of…
Serves households, flat owners and tenants, offices and storage facility users, plus executors and solicitors handling probate, mainly in London and the South East.
Financial Health
DistressedDistressed · -8% CAGR over 4y
Location
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Computed from 5 filingsProvides accounting and tax services for businesses and individuals, including bookkeeping, VAT returns, financial statements, tax compliance, personal tax returns and specialist tax planning. Also…
Serves a mixed B2C and B2B client base: private individuals, sole traders and other non-corporate entities, owner-managed businesses, companies and international corporate groups.
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides IT consulting and technology services for commodity trading, logistics and resource companies, including IT strategy, systems integration, data and analytics solutions, blockchain and custom…
Serves B2B organisations in commodity and global trade markets, including commodity trading houses, logistics providers, resource companies, supply chain operators, and clients in finance and…
Financial Health
StableStable
Location
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Computed from 5 filingsProvides contract security services, supplying SIA‑licensed security officers for manned guarding, retail security and event security. Offers short‑term and long‑term on‑site guarding to protect…
Serves public and private organisations across London and the UK needing manned guarding, retail security, or event security on ad hoc, short-term, or long-term contracts.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
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Computed from 4 filingsProvides home care services for individuals needing support with daily living, including personal hygiene, mobility assistance, meal preparation, domestic tasks, medication support, companionship,…
Serves individuals in London who need in-home personal care and practical support, including older people, people with mobility or health needs, and clients requiring companionship, live-in,…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 3y
Location
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Computed from 5 filingsProvides accounting services including tax preparation and planning, bookkeeping, and financial consulting for individuals and businesses, supporting financial record keeping, compliance, and…
Serves individuals and businesses, especially business owners across diverse industries, seeking support with tax, bookkeeping and financial management.
Financial Health
StrongStrong
Location
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Computed from 5 filingsSupplies food and catering products to restaurants and takeaway businesses, including frozen poultry, drinks, fresh and chilled foods, fats and oils, sauces, spices, flour and breading, pizza…
Serves catering and foodservice businesses, including restaurants, takeaways, chicken shops and chefs, with buyers needing wholesale food, packaging, cleaning and kitchen supplies.
Financial Health
HealthyHealthy · Hiring · 25% CAGR over 4y
Location
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Computed from 5 filingsProvides accounting and tax services including bookkeeping, VAT returns, payroll, CIS and pension administration, preparation of company financial accounts, self‑assessment tax returns, and advice on…
Serves UK businesses needing bookkeeping, VAT, payroll, CIS, pensions and company accounts, alongside individuals requiring self-assessment or capital gains tax support.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides accounting and tax advisory services for individuals and businesses, including tax compliance, tax planning and structuring, personal and corporate tax returns, Construction Industry Scheme…
Serves individuals and domestic or international businesses needing tax and financial advice, including clients with corporation tax, CIS, property income, capital gains, inheritance tax, and…
Financial Health
StrongStrong · Hiring · 50% CAGR over 4y
Location
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Computed from 5 filingsProvides legal advice and representation for individuals and businesses, specialising in immigration matters including visa applications, settlement and citizenship, appeals, sponsor licences and…
Serves individuals, families, employees, employers and business owners needing UK legal support, including immigration clients, entrepreneurs expanding into the UK, sponsor licence applicants, debt…
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 4y
Location
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Computed from 3 filingsSupplies carpets, luxury vinyl tile and other flooring products to retailers, contractors and residential customers. Provides showroom sales, design consultation, project management, estimation and…
Serves retailers and flooring contractors in London and the South East, alongside homeowners seeking showroom consultations. Also targets interior designers, project managers, specifiers and…
Financial Health
HealthyHealthy · -15% CAGR over 2y
Location
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Computed from 5 filingsProvides recruitment and consultancy services to healthcare organisations, supplying temporary and permanent clinical and care staff. Offers workforce planning support, compliance checks, and…
Serves B2B healthcare organisations across the UK, especially care homes, private care providers and healthcare facilities needing workforce and operational support.
Financial Health
StableStable · Hiring · 16% CAGR over 4y
Location
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Computed from 5 filingsProvides private security services including manned guarding, retail and corporate security, mobile patrols and alarm response, event security, and waking watch fire safety patrols, along with…
Serves businesses and organisations responsible for premises, assets and public safety, including retailers, corporate offices, facilities managers, event organisers and property managers.
Financial Health
WeakWeak · -6% CAGR over 4y
Location
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Computed from 5 filingsProvides manned security guarding services for businesses and organisations, supplying trained security guards to protect premises, assets and staff, and offering on-site physical security presence…
Serves businesses and organisations in London across public and private sectors that require a physical security presence to protect premises, staff and assets.
Financial Health
WeakWeak · Hiring · 52% CAGR over 4y
Location
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Computed from 5 filingsProvides nursery and pre-school childcare, after-school clubs and holiday clubs for children from infancy to primary school age, offering supervised play, early learning activities and care services…
Serves parents and carers in Greenwich seeking nursery, preschool, after-school and holiday club places for children aged 3 months to 12 years.
Financial Health
WeakWeak · Hiring · 19% CAGR over 5y
Location
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Computed from 5 filingsProvides domiciliary home care services for adults, including personal care, assistance with getting up and bathing, meal preparation, housekeeping, companionship and outings, and administrative…
Serves individuals needing domiciliary care and befriending support, including older people and adults needing help at home, as well as family members arranging care for loved ones in the London and…
Financial Health
HealthyHealthy · Hiring · 298% CAGR over 4y
Location
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Computed from 4 filingsProvides interior design and build services for commercial spaces, including office, retail and hospitality fit-outs. Manages projects from concept and planning through construction and furniture…
Serves commercial businesses and organisations needing workplace, retail or hospitality interiors, including luxury brands, entertainment studios, accountancy firms, banking companies and teams…
Financial Health
StableStable · Hiring · 9% CAGR over 3y
Location
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Computed from 5 filingsProvides domiciliary care services including personal care, live‑in care, senior care and specialist support for individuals in their own homes. Services include one‑to‑one assistance with daily…
Serves older adults, people with specialist or personal care needs, and their families seeking home-based support across London, including privately funded and personal budget users.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
Location
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Computed from 4 filingsProvides consulting services in business strategy, digital transformation and technology advisory. Advises organisations on IT architecture, data and analytics strategy, and system design, with…
Serves B2B organisations operating in complex global markets, particularly commodities, international trade, finance and payments, targeting leadership and technology teams seeking independent…
Financial Health
StableStable
Location
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Computed from 5 filingsProvides fire protection and electrical compliance services for commercial and public sector buildings, including fire door installation and maintenance, fire stopping, alarm and emergency lighting…
Serves commercial businesses, public sector bodies, housing associations, property managers and homeowners needing building safety, fire compliance, electrical and renewable energy support.
Financial Health
WeakWeak
Location
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Computed from 5 filingsProvides software development and technology consultancy services building AI-powered applications, data dashboards, and web and mobile platforms. Also supplies remote developers and engineering…
Targets B2B technology leaders at startups, enterprises and other organisations with software product, data/analytics or engineering needs, especially teams extending capacity with UK-based or…
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides domiciliary care services for adults requiring support at home, including personal care, medical support, companionship, and assistance with daily living activities, arranging care workers…
Serves individuals needing home care and families arranging support for loved ones across London boroughs including Westminster, Kensington & Chelsea, Ealing, Brent, Haringey, Tower Hamlets,…
Financial Health
StrongStrong · Growing, Hiring · 2% CAGR over 4y
Location
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Computed from 5 filingsDevelops software tools for Oracle ERP Cloud that support configuration management, compliance checks, and data extraction. Products include SQL query tools, user access audit reports, configuration…
Sells to businesses and public sector organisations using Oracle ERP Cloud, especially IT managers, security teams, compliance officers, finance teams and senior leaders in regulated sectors such as…
Financial Health
StableStable · -4% CAGR over 4y
Location
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Computed from 5 filingsEngages in international marketing and distribution of chemical raw materials and industrial products. Sources materials from manufacturers and manages orders, shipping and documentation, supplying…
Serves industrial B2B buyers and manufacturers in overseas markets, including personal care, detergents, foundry, oil and gas, food, paints/coatings/inks, textiles, hygiene, animal health, aerospace,…
Financial Health
WeakWeak · -7% CAGR over 4y
Location
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Computed from 3 filingsProvides immigration consultancy and application support for UK visas and nationality matters, including work permits, family and student visas, settlement and citizenship applications, sponsorship…
Serves individuals, families, students, workers and investors seeking UK visa, settlement or citizenship support, plus employers needing Tier 2/Tier 5 sponsorship and related immigration compliance…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
Location
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Key facts
About 1% of the trading cohort reports turnover above £5M (2 of 129 firms) — the rest sits below that revenue band.
8% of the cohort was incorporated since 2022 (11 firms), so a sizeable share is in its first few filing cycles.
58.1% of the cohort also run a content-management layer, and 32.6% use a visual page-builder alongside the hosted website setup.
Form, search and measurement tooling sit close to the website layer: 20.9% use form capture, 18.6% use SEO tooling and 17.1% use analytics tagging.
Healthcare providers account for 24.8% (32 firms), followed by education and training at 11.6% (15 firms) and recruitment and staffing at 10.1% (13 firms).
Financial-health scores are mixed: 37.2% sit in the highest band, 22.5% in the next band, 14.7% are weak and 7.8% are distressed.
The London cohort has 200 verified directors attached to it.
What else do One.com users run?
Share of the 129 One.com-running UK companies where each technology was also detected. As of June 2026.
Who runs One.com in the UK?
By sector
Sectors overlap, so shares need not sum to 100%.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
7
Median headcount
£358.9K
Median UK turnover
1.6%
Above £5M turnover
11
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 181 companies, alongside financials and websites, in one Excel + CSV file.
How One.com usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. 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.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
One.com is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
One.com elsewhere
Frequently asked questions
How many companies in London use One.com?
How is One.com usage detected?
What kinds of companies use One.com in London?
What do One.com users in London also run?
How fresh is this data?
Can I get contact details for these companies?
Buy all 181 companies as a spreadsheet.
One Excel/CSV file with company details, websites and key data — yours to download and use.