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Quantity Surveying Companies in London: 800+ Active Firms (2026)
Quantity surveying companies cost, value and commercially manage construction projects for clients across London.
Commercial decisions usually sit with development directors, contractor commercial teams, infrastructure programme offices and public-estate managers, rather than a single procurement function. London demand splits between cost consultancy for developers and investors, commercial management for contractors, procurement and contract administration for public or infrastructure clients, and project-controls work inside professional services-led teams. Engagements tend to be project-based: a single cost plan or tender review at the small end, retained commercial support across programmes for larger clients. The operating pattern favours firms that can translate drawings, bills, contracts and site change into financial reporting that boards and project sponsors will accept.
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London has 832 actively trading quantity surveying firms in this list, making it a sizeable local cohort rather than a niche advisory pocket. Reported employment totals 1,924 people across the London cohort. Scale remains uneven: 17 firms report turnover above £5M, while 247 were incorporated since 2022. That mix points to many owner-managed practices and project-led specialists sitting alongside a smaller group of multi-office consultancies able to support framework work, contractor claims, infrastructure programmes and institutional development pipelines.
Quantity surveying is not a fully reserved UK activity, so market entry is shaped less by statutory permission than by client assurance, procurement rules and professional accreditation. The UK Regulated Professions Register treats “Chartered Quantity Surveyor” as an accreditation-based profession, with no reserved activities and restrictions applying to use of title. The chartered title and associated membership designations sit with the profession’s standards body, which also sets expectations on ethics, conduct and competence. For buyers, that makes chartered status a trust and tendering signal rather than a legal monopoly over cost advice.
London’s quantity surveying market appears likely to remain fragmented, with many practices staying close to owner-managed advisory work while a smaller tier competes for programme and framework roles. Cost inflation, contractor insolvency risk and tighter scrutiny of project change tend to favour firms that can evidence controls, documentation and contract discipline. Consolidation is plausible where succession, client-framework access or specialist claims capability matter, but the cohort still looks service-led rather than platform-led, so capacity and professional credentials may remain the main constraints.
832
Active firms
2026
17
Above £5M turnover
London firms
247
Incorporated since 2022
London firms
Key facts
About 2% of the trading cohort reports turnover above £5M (17 of 832 firms) — the rest sits below that revenue band.
29% of the cohort was incorporated since 2022 (247 firms), so a sizeable share is in its first few filing cycles.
Quantity surveying is not a fully reserved UK activity; the UK Regulated Professions Register lists “Chartered Quantity Surveyor” as accreditation-based, with “None” reserved activities and title restrictions only.
Chartered Surveyor status is qualification-led, with MRICS and FRICS designations attached to professional status rather than a statutory monopoly over quantity surveying work.
A sector estimate put UK quantity surveyor industry revenue at £1.9 billion in 2025-26, with a five-year CAGR of -0.4%.
European construction commentary indicated output across 19 monitored European countries declined by 2.4% in 2024, while UK annual construction output grew 0.4%.
Top London quantity surveying companies
QUANTEM SERVICES LIMITED
Trajectory
4y · 2019–NowFinancial sub-scores
Computed from 4 filingsProvides construction and property consultancy services including cost planning and management, project management, employer’s agent roles, building surveying, procurement and contract advice, health…
Serves B2B and public-sector clients in property and construction, including developers, investors, asset managers, education bodies and organisations delivering commercial, residential, retail,…
Financial Health
HealthyHealthy · 11% CAGR over 1y
Location
Mace Foundation
Provides construction and project delivery consultancy services, including advisory, cost and commercial management, programme and project management, construction management, contracting, and…
Serves business and public sector clients commissioning major built-environment projects, including developers, property owners, transport operators, defence bodies, healthcare and life sciences…
Location
W.T. Partnership Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides cost management and quantity surveying, project delivery, infrastructure advisory, and digital portfolio management services for property, construction, and infrastructure projects,…
Serves B2B and public-sector clients across property, construction and infrastructure, including aviation, commercial workplace, data centre, defence, education, energy, healthcare, transport, water,…
Financial Health
StableStable · Profitable, Hiring · 5% CAGR over 2y
Location
Trajectory
3y · 2020–NowFinancial sub-scores
Computed from 3 filingsProvides construction cost consultancy services including cost planning, budget management and commercial advice for building projects. Advises developers and asset owners on project costs, financial…
Serves property developers, investors, landlords and corporate occupiers delivering commercial, workplace and science/innovation construction projects in London and the South East.
Financial Health
StableStable
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction and property consultancy services including cost management and quantity surveying, project management, employer’s agent roles, building surveying, CDM advisory, NEC…
Serves public and private sector construction and property clients, including commercial, education, government, healthcare, heritage, hospitality, hotel, leisure and residential organisations.
Financial Health
StableStable
Location
ABC CONSTRUCTION CONSULTANTS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides construction consultancy services including cost management, quantity surveying, project management, contract administration, and risk management. Advises clients on engineering services,…
Serves B2B clients in the built environment, including developers, property owners and project teams across healthcare, residential, leisure, mission-critical, mixed-use, office and retail sectors.
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
Sunrider East Asia
Provides construction consultancy services including project and programme management, cost management, quantity surveying, and building surveying. Advises public and private sector clients on…
Serves public and private-sector organisations with built-environment projects, including clients in healthcare, education, defence, transport, utilities, energy, real estate, hospitality, retail,…
Location
Trajectory
1y · 2024–NowProvides quantity surveying and construction consultancy services, including project management, contract administration, cost management, procurement and tendering support, budgeting and value…
Serves organisations undertaking construction and property projects across public and private sectors, including clients in multiple industries needing external project, cost, contract, procurement…
Financial Health
Insufficient historyInsufficient history
Location
Provides construction consultancy services including cost management and quantity surveying, project and programme management, building surveying, and strategic advisory for public and private sector…
Serves public and private sector organisations delivering built environment projects, including buyers in automotive, aviation, commercial property, defence, education, energy, healthcare, rail,…
Location
TCQ SURVEYORS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides quantity surveying and construction consultancy services, including cost management, project management, and employer’s agent roles. Supports building projects by managing budgets,…
Serves commercial property teams, healthcare providers, NHS trusts, education estates teams, and other organisations managing construction, refurbishment, fit-out or facilities upgrade projects.
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 3y
Location
WISDOM LONDON LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides independent quantity surveying, construction management and dispute resolution services for construction projects. Offers cost planning, value engineering, programme and risk management, and…
Serves B2B construction and property clients involved in large London development schemes, including developers, project owners and contractors delivering £30m–£1bn mixed-use or residential projects.
Financial Health
StableStable · 0% CAGR over 2y
Location
Artform PM Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides construction project management services for residential developments, refurbishments and commercial fit‑outs. Acts as project manager, quantity surveyor and contract administrator,…
Serves property developers, investors, landowners with development sites, and asset managers involved in residential schemes, complex site transformations, refurbishments and commercial fit-outs,…
Financial Health
StableStable · -9% CAGR over 3y
Location
Omnium Int. (Uk) Limited
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides construction consultancy services including project management, cost consultancy and quantity surveying, contract and commercial management, risk and compliance advisory, dispute resolution,…
Sells to organisations delivering built-environment projects, including developers, asset owners and public-sector clients in commercial, retail, residential, infrastructure, industrial, hospitality,…
Financial Health
StrongStrong · Hiring · 5% CAGR over 3y
Location
Provides construction consultancy services including project and programme management, cost management, quantity surveying, building surveying, and advisory services for public and private sector…
Serves public and private sector organisations developing or managing built-environment assets, including property, infrastructure, healthcare, education, energy, transport, defence, technology,…
Location
CPC Project Services
Provides project and cost management consultancy for construction and infrastructure projects. Services include programme and project management, cost consultancy, risk and schedule management,…
Serves B2B and public sector clients delivering capital projects, including transport and infrastructure operators, property developers, commercial organisations, utilities, energy and nuclear…
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides project management, quantity surveying and principal designer services for construction projects. Activities include cost planning, procurement, budget control, design team coordination,…
Serves businesses and project owners in the construction industry, including clients and project teams across a wide range of sectors, mainly in London, the South East, the UK and internationally.
Financial Health
DistressedDistressed
Location
POTTER RAPER LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction consultancy services including project management, quantity surveying, building surveying, due diligence and fund monitoring, health and safety, sustainability advice, and clerk…
Serves B2B and public sector clients developing property and infrastructure, including residential developers, education institutions, healthcare/NHS bodies, commercial landlords, cultural/community…
Financial Health
StableStable · -68% CAGR over 4y
Location
HOME IS CONSULTING LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial management and quantity surveying services for construction projects, supporting sectors including building, engineering, utilities, transportation, energy, property and finance,…
Serves B2B clients in the construction industry, including organisations in building, engineering, utilities, transportation, energy, property and financial sectors.
Financial Health
DistressedDistressed
Location
Provides construction consultancy services including project and programme management, cost management, quantity surveying, building surveying and advisory services. Supports planning and delivery of…
Serves public and private sector organisations planning and managing built-environment assets, including clients in technology, healthcare, financial institutions, hospitality, education, defence,…
Location
CACE QS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides MEP quantity surveying and commercial management services for construction projects, including cost planning, procurement advice, contract administration, measurement support, project…
Serves B2B construction-sector clients, including main contractors, MEP/building services subcontractors and partners delivering large commercial, residential, retail, healthcare and public-sector…
Financial Health
StableStable · -58% CAGR over 4y
Location
CPC Project Services
Provides project and cost management consultancy for infrastructure and property developments, including programme management, project controls, risk management, building surveying, and construction…
Serves public and private sector organisations delivering capital projects, including transport and utilities operators, healthcare and education bodies, residential and commercial developers,…
Location
Circle Property Partnership Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides project delivery consultancy for construction and property development, including project management, quantity surveying, carbon management and life‑cycle cost analysis, employer’s agent…
Serves B2B clients in the built environment, including real estate developers, property investors and organisations with in-house development teams delivering construction and development projects.
Financial Health
HealthyHealthy
Location
Construction Consultants (London) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction consultancy services including project management, cost consultancy, employer’s agent and contract administration, development management, fund monitoring, building surveying,…
Serves B2B property and construction clients, including large organisations, smaller developers, investors and funders involved in commercial, residential, industrial, hospitality and leisure…
Financial Health
WeakWeak · Hiring · 50% CAGR over 4y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides quantity surveying consultancy focused on mechanical, electrical and plumbing (MEP) engineering services. Advises contractors and projects on commercial management, cost control,…
Serves businesses in the construction and MEP engineering sectors, including contractors and project teams needing commercial quantity surveying support.
Financial Health
StableStable · -11% CAGR over 4y
Location
Cumming Management Group UK Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides project management and cost consulting services for construction and infrastructure projects, including programme management, cost and commercial management, planning and scheduling, project…
Serves private and public-sector organisations delivering capital projects, including developers, asset owners and operators in data centres, healthcare, education, hospitality, infrastructure,…
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 2y
Location
Consult & Project Management Services Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides construction and development consultancy services including quantity surveying, project management, fund monitoring and employer’s agent roles. Advises private developers, public bodies and…
Serves B2B and public sector clients involved in property and construction projects, including private developers, development corporations, owner-occupiers, lenders, local authorities, housing…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Doyle Hamilton Associates Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides construction consultancy services including cost management, project management, contract administration and health and safety principal designer roles. Advises on procurement, risk…
Serves B2B and institutional property clients needing construction consultancy, including property teams, company boards and external stakeholders across multiple construction sectors, such as…
Financial Health
StrongStrong · Growing, Hiring · 13% CAGR over 2y
Location
Bond Project Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides quantity surveying, commercial management, and project management services for construction and retail fit‑out projects, including multi-site rollouts, refits, and store developments, with…
Serves UK retail and trade businesses, including national chains planning store fit-outs, multi-site roll-outs, rebrands, warehouses, offices, airports, rail, shopping centres, high streets and…
Financial Health
HealthyHealthy · Hiring · 16% CAGR over 4y
Location
Fanshawe Limited
Trajectory
1y · 2025–NowProvides chartered quantity surveying and project management services for construction and property projects. Offers cost management, risk management, litigation support, and reinstatement cost…
Serves B2B and institutional property clients across commercial real estate, education, hotels, heritage and historic buildings, museums, public access and religious facilities, plus high-end…
Financial Health
Insufficient historyInsufficient history
Location
Cantidad Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides commercial consultancy services to construction and infrastructure projects, including quantity surveying, cost management, contract administration, risk management and dispute resolution,…
Serves B2B clients in construction and infrastructure, including highways, transport, rail, utilities and energy organisations, plus legal teams involved in construction disputes.
Financial Health
HealthyHealthy · Hiring · 133% CAGR over 1y
Location
ACQ Consulting Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides procurement and commercial management consultancy for construction and built environment projects. Advises on procurement strategy, contract management, cost control and risk management…
Serves public and private sector clients delivering major construction, infrastructure and built-environment projects, including rail, utilities, healthcare, education, central government, sports,…
Financial Health
StableStable · 0% CAGR over 2y
Location
Fusion Building Consultancy
Trajectory
2y · 2019–NowProvides building surveying and construction consultancy services for commercial property, including project management, employer’s agent and contract administration, cost consultancy, development…
Serves B2B clients in UK commercial real estate, including owner-occupiers, tenants, investors, developers and funders across hospitality, industrial, retail, motor retail, leisure and office sectors.
Financial Health
Insufficient historyInsufficient history
Location
Thomas Callum Associates Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides quantity surveying, estimating and construction consultancy services for building projects. Services include cost planning, bills of quantities, tender analysis, procurement support,…
Serves architects, property developers, contractors, subcontractors and homeowners involved in construction projects, with emphasis on London and Bexley markets.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
HC QS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides quantity surveying, commercial management, and contract and legal support services for construction projects. Specialises in mechanical, electrical and public health (MEP) systems, and…
Serves B2B clients and contractors across the construction industry, especially mechanical, electrical and public health (MEP) projects, plus rail, tube, aviation, highways and mass transportation…
Financial Health
HealthyHealthy · 1% CAGR over 4y
Location
ABAKUS CONSULTING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction cost consultancy and quantity surveying services, advising clients on cost planning, budgeting, procurement, and financial management of building projects across sectors…
Serves B2B clients commissioning construction projects in commercial, residential, student accommodation, hotels and leisure, life sciences and retail sectors.
Financial Health
StableStable · -65% CAGR over 4y
Location
THOMPSON COLE LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides construction cost management, quantity surveying, project management and consultancy services for building developments, working with developers, contractors, banks and public sector clients…
Serves developers, contractors, banks and local authorities involved in commercial, retail, industrial, sports, leisure, residential and engineering construction projects.
Financial Health
StableStable · Hiring · 4% CAGR over 4y
Location
PROJECT & BUILDING CONSULTANCY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides property and construction consultancy services including project management, cost consultancy, development monitoring, and building surveying. Advises on dilapidations, party wall matters,…
Serves UK property owners, developers, investors and occupiers across commercial, residential, hotel, industrial/logistics, retail, student accommodation and motorway service sectors.
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 4y
Location
PLANNING & PROJECT DELIVERY LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides construction consultancy services including quantity surveying, project management, employer’s agent roles, and procurement advice. Also conducts construction-related due diligence for…
Serves B2B property developers, real estate investors and construction partners across the UK, particularly clients delivering commercial, industrial and logistics development projects.
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
MPA (Construction Consultants) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides construction consultancy services including quantity surveying, cost management, project coordination and contract administration. Works on retail, hospitality, commercial and private…
Serves businesses and private clients commissioning construction projects, particularly in retail, hospitality, commercial property and private residential sectors.
Financial Health
HealthyHealthy · -7% CAGR over 2y
Location
Fulkers LLP
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides construction consultancy services including project management, cost management, building surveying, clerk of works, employer’s agent and contract administration, architectural design,…
Serves public-sector bodies, private developers, residential property investors and compliance-led clients investing in UK and international property and construction projects.
Financial Health
StableStable · Hiring · 13% CAGR over 1y
Location
JOHN COBB CONSULTING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction and property consultancy services including project management, quantity surveying, and building surveying. Also delivers cost management, employer’s agent services, project…
Serves B2B and institutional property owners, developers and occupiers commissioning construction projects, particularly in education, healthcare and care homes, hotels, offices, residential and…
Financial Health
StableStable · -16% CAGR over 4y
Location
PROVEN PROJECT SOLUTIONS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction consultancy and commercial management services for infrastructure, utilities and building projects, including quantity surveying, estimating and tendering, cost planning,…
Serves B2B clients in construction, civil engineering, utilities, infrastructure and building projects, including major contractors and organisations delivering complex capital projects.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
THIRD LONDON WALL CONSULTING LTD
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides project and cost management consultancy for property development projects. Services include project management, contract administration, design and construction coordination, scheduling,…
Serves UK property developers, funders, financial institutions, owners, occupiers, operators and end users delivering commercial office, life sciences, mixed-use, hospitality and leisure development…
Financial Health
StrongStrong · Hiring · 41% CAGR over 3y
Location
MBM CONSULTING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides construction and engineering consultancy services including project management, quantity surveying, planning and scheduling, commercial management, contract and procurement advice,…
Serves B2B and public-sector clients in construction, civil engineering and the built environment, including major contractors, subcontractors, consultancies, developers, client organisations, law…
Financial Health
WeakWeak · Hiring · 11% CAGR over 2y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides construction and property consultancy services, including cost management, project management, employer’s agent services, building surveying, principal designer duties, and technical due…
Serves property developers, investors, asset managers, landlords and public, education or healthcare clients commissioning construction projects across commercial, residential, retail, industrial,…
Financial Health
StableStable
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction consultancy services including cost management, project management and project monitoring for property developments such as residential schemes, hotels, commercial buildings and…
Serves B2B clients behind prime and super-prime residential developments, 5-star hotels, commercial spaces and complex data centres, including property developers, owners and project sponsors.
Financial Health
DistressedDistressed
Location
Childerstone Project Management
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides project management and consultancy services for property development and construction projects, including development management, programme management, building surveying, development…
Serves businesses and institutional clients involved in property development and asset programmes, including developers, investors, landlords, tenants, funders, joint venture partners and…
Financial Health
StrongStrong · Hiring · 73% CAGR over 2y
Location
AY-ER UK LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides property and construction consultancy services including project and programme management, quantity surveying, building surveying, principal designer and employer’s agent services, advising…
Serves public- and private-sector organisations with property assets, including clients managing construction, refurbishment and property portfolios across sectors.
Financial Health
StrongStrong · Hiring · 129% CAGR over 3y
Location
Provides construction and infrastructure consultancy and delivery services including programme and project management, cost and commercial management, planning, construction management, contracting,…
Serves public-sector bodies and large private organisations commissioning complex building and infrastructure projects, including clients in cities and places, defence, healthcare and life sciences,…
Location
Provides construction and consultancy services for building and infrastructure projects, including advisory, cost and commercial management, programme and project management, construction management,…
Serves public and private sector clients delivering major property, infrastructure and facilities programmes, including developers, government bodies, defence, healthcare, life sciences, transport,…
Financial Health
Insufficient historyInsufficient history
Location
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How London quantity surveying companies work and how to sell to them
What they do
Revenue usually comes from professional fees attached to construction and property decisions: feasibility estimates, cost plans, bills of quantities, tender analysis, interim valuations, final accounts, claims support and commercial reporting. Smaller practices often sell fixed-fee work packages or day-rate support, while larger firms price by project phase, framework call-off, percentage of construction value or retained programme team. The service is labour-led, but delivery depends on cost libraries, measurement tools, contract templates, document trails and reporting packs. Margins tend to depend on senior surveyor utilisation, repeat developer relationships and the ability to control scope when projects change after appointment.
Who they sell to
Typical buyers are developers, main contractors, specialist subcontractors, infrastructure owners, local authorities, housing providers and estate teams inside public bodies. The day-to-day sponsor is usually a development director, commercial director, project director, head of procurement, estates lead or finance stakeholder with capital-budget exposure. Private-sector work is often won through referral, negotiated proposal or competitive fee tender; public and infrastructure work tends to run through frameworks, RFPs and scoring matrices. Sales cycles vary by risk and governance: a discrete cost review can move in weeks, while programme appointments usually take months and require evidence of insurance, competence, capacity and comparable project experience.
What they buy
Most quantity surveying firms tend to spend on tools that make fee earners more productive and reduce argument over versions, assumptions and approvals. Relevant categories include estimating and measurement software, project-controls systems, document management, contract administration, change-control tracking, time recording, practice management, accounting, billing, CRM, bid support, management reporting and cyber security. Services spend usually sits around recruitment, professional indemnity advice, legal review, tax and accounting, marketing, training, and accreditation support. Larger practices also buy cloud hosting, data warehousing, workflow automation and business-intelligence capability so commercial teams can compare project performance, utilisation and pipeline without relying only on spreadsheets.
Why and how to sell to them
Buying intent often appears when a practice wins a framework place, takes on a larger programme, hires senior commercial staff, opens a London project office or finds that spreadsheets no longer satisfy client reporting. Other triggers include professional indemnity renewal, a rise in disputes, delayed payment on contractor work, succession planning or a push to improve fee recovery. Outbound messages tend to land better when they speak to evidence trails, change governance, utilisation, tender turnaround and cash collection rather than generic efficiency. The useful angle is usually risk reduction with clearer commercial control, not broad promises about modernising construction.
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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